POWER ELECTRONICS

POWER ELECTRONICS

	SCR RELATED TRAINERS

	IGBT / MOSFET RELATED PRODUCT

	OTHER PRODUCTS

	POWER ELECTRONICS ACCESSORIES

	POWER ELECTRONICS

	SCR RELATED TRAINERS

	A. SCR BASED MODULES
	B. SCR TRIGGERING CIRCUITS TRAINERS
	C. LOW VOLTAGE SCR APPLICATION TRAINER
	D. HIGH VOLTAGE SCR APPLICATION TRAINER.
	E. SCR BASED AC/DC DRIVES
	F. STANDALONE SCR TRAINERS


A. SCR BASED MODULES [TOC]

1. IGBT, MOSFET, SCR, TRIAC, DIAC CHARACTERISTICS STUDY TRAINER (PEC16M1-A)[TOC]
2. SCR VI CHARACTERISTICS STUDY TRAINER (PEC16M1B)
3. TRIAC VI CHARACTERISTICS STUDY TRAINER (PEC16M1C)
4. DIAC VI CHARACTERISTICS STUDY TRAINER (PEC16M1E)
5. TRANSIENT CHARACTERISTICS OF SCR AND MOSFET (VPET-216)
6. SWITCHING CHARACTERISTICS OF SIT [PEC16M1D]
7. CONSTRUCTION OF SCR USING TWO TRANSISTOR [PEC16MF]

1. IGBT, MOSFET, SCR, TRIAC, DIAC CHARACTERISTICS STUDY TRAINER (PEC16M1-A) [TOC]

Basic static characteristics study trainer. LM 723 based variable DC power supply (0-30V) for SCRVak. LM 723 based variable DC power supply (0-12V) for gate voltage of all devices.
Separate section for SCR / TRIAC characteristics. Separate section for IGBT / MOSFET characteristics. Two No’s fixed load resistor for all devices. Four No’s potentiometer to vary all voltages. LED indication for all power supply. Three No’s. digital multimeter for measurement of device parameters. 230V AC input with Power ON/OFF switch.
SUGGESTED EXPERIMENTS :
Study of VI characteristics of SCR. Study of VI characteristics of TRIAC. Study of Transfer characteristics of MOSFET. Study of Transfer characteristics of IGBT, Study of Dynamic characteristics of MOSFET. Study of Dynamic characteristics of IGBT.

2. SCR VI CHARACTERISTICS STUDY TRAINER (PEC16M1B) [TOC]

Features
Basic VI characteristics study trainer. Consists of one no. TYN612 SCR with heat sink. LM723 based 20V DC power supply for gate voltage. One no. potentiometer used to vary the gate current 0 - 30V DC variable power supply for anode, cathode voltage variation. One no. potentiometer used to vary the Vak. One no high wattage fixed load resistor.
One no. toggle switch to ON/OFF gate voltage. Two no. DC ammeter, voltmeter/multimeter provided to measure Ig & ak, Ia. 230V AC input . Power ON/OFF switch. All components are mounted on a screen printed PCB fixed on a nice wooden cabinets.
SUGGESTED EXPERIMENTS :
1.Static anode-cathode (VI) characteristics of SCR at different gate current.

3. TRIAC VI CHARACTERISTICS STUDY TRAINER (PEC16M1C) [TOC]

Features
Basic VI characteristics study trainer. Consists of one no. BTA12 TRIAC with heat sink. LM723 based 20V DC power supply for gate voltage. One no. potentiometer used to vary the gate current. 0 - 30 / 50V DC variable power supply for MT1,MT2 voltage variation. One no. potentiometer used to vary the Vmt1, mt2 . One no. high wattage fixed load resistor One no. toggle switch to ON/OFF gate voltage.
Two no. DC ammeter, voltmeter / multimeter provided to measure device parameters. 230V AC input . Power ON/OFF switch with indication. All components are mounted on a screen printed PCB fixed on a nice wooden cabinets.
SUGGESTED EXPERIMENTS :
Static (VI) characteristics of TRIAC at different gate current.

4. DIAC VI CHARACTERISTICS STUDY TRAINER (PEC16M1E) [TOC]

Basic DIAC VI characteristics study trainer. Consists of one no. DIAC with proper heat sink. (0 -100) 30V DC variable power supply for MT1, MT2 voltage variation. One no. potentiometer used to vary the MT1/MT2 voltage. One no. high wattage fixed load resistor. One no. toggle switch to ON/OFF DC voltage.
Two No’s DC ammeter, voltmeter/ multimeter provided to measure device parameters. 230V AC input . Power ON/OFF switch LED indication. All components are mounted on a screen printed PCB fixed on a nice wooden cabinets.
SUGGESTED EXPERIMENTS :
1. Static (VI) characteristics of DIAC

5. TRANSIENT CHARACTERISTICS OF SCR AND MOSFET (VPET-216) [TOC]

a). Transient Characteristics of SCR :
b). Transient Characteristics of MOSFET :
c). Power Supply :

a). Transient Characteristics of SCR :

Features
One SCR (TYN 612) with proper heat sink Turn-ON transient (OR) turn off transient characteristics can be studied. IC Based square wave generation for VAK and VGK One No. of fixed load resistor.
b). Transient Characteristics of MOSFET :
One IRF840 MOSFET with heat sink One no. 15V/30V power supply (Built-in) for VDS One no. of 555 based square wave generation with transistor driver circuit One no. of fixed load resistor.
c). Power Supply :
230V AC Input, ±15V DC for control circuit Power ON/OFF switch with indication.

6. SWITCHING CHARACTERISTICS OF SIT [PEC16M1D] [TOC]

The switching characteristics of the device SIT can be studied using this module.
Features :
Consists of SIT Power switching devices Built in power supply for the control circuitry and the power circuitry ± 15V @ 1A for control circuitry 15V @ 1A for power circuitry. All terminals of the devices are brought out to Banana sockets mounted at the front panel for easy wiring. Mimic diagram of the block schematic of the control circuitry and switching devices is screen printed at the front panel. The circuits, Power supply etc. are browsed in a sleek cabinet.

7.CONSTRUCTION OF SCR USING TWO TRANSISTOR [PEC16MF] [TOC]

One SCR (TYN 612) with proper heat sink Turn-ON transient (OR) turn off transient One No. of NPN transistor & PNP Transistor provided for SCR circuit. One No. DC voltage source for SCR in DC mode operation. One No. 24V AC voltage source for SCR in AC mode operation Simple firing circuit with firing angle variation for AC mode operation

B.SCR TRIGGERING CIRCUITS TRAINERS [TOC]

i. TYPES OF TRIGGERING MODULE
ii. TYPES OF POWER MODULE

i. TYPES OF TRIGGERING MODULE [TOC]

1. UJT, R,R-C FIRING MODULE (PEC14M12)
2. 555 FIRING MODULE (PEC14M13)
3. LINE SYNCHRONIZED FIRING MODULE (PEC14M14)
4. SINGLE PHASE BRIDGE FIRING CIRCUIT WITH PI (PEC14M14 - PI)
5. CHOPPER FIRING MODULE (PEC14M16)
6. CYCLO CONVERTER FIRING MODULE (PEC14M17)
7. COSINE FIRING CIRCUIT FOR SCR CONVERTER (PEC14M18)
8. MICROPROCESSOR BASED SINGLE PHASE SCR TRIGGERING CIRCUIT TRAINER (PEC18MP1)
9. MICROPROCESSOR BASED THREE PHASE SCR TRIGGERING CIRCUIT TRAINER (PEC18MP2)
10. TCA-785 IC BASED SINGLE PHASE SCR FIRING CIRCUIT(PEC14M24)
11. TCA-785 IC BASED THREE PHASE SCR FIRING CIRCUIT(PEC14M25)
12.SCR TRIGGERING CIRCUIT TRAINER (PEC14M12E)

1. UJT, R,R-C FIRING MODULE (PEC14M12) [TOC]

Consists of three types of basic firing circuit to trigger SCR. Separate sections for R - firing , RC - firing , UJT firing circuit. 24V AC / 1AMP provided for firing circuit input voltage. One potentiometer used to vary the firing angle of UJT firing circuit. One potentiometer used to vary the firing angle of R - firing circuit.
One potentiometer used to vary the firing angle of RC - firing circuit. One no. toggle switch for ON/OFF 24VAC. Four No’s firing pulses terminated on the front panel for connecting external device module. (UJT firing circuit) 1:1:1 Pulse transformer used for UJT firing circuit pulse isolation. One no . SCR with snubber circuit forms half wave controlled converter circuit for checking all three three firing circuit. 230V, 50HZ AC input, fuse provided for over load protection. One no . rocker switch with LED indication for power ON/OFF.
SUGGESTED EXPERIMENTS :
Study of UJT firing circuit. Single phase half wave controlled converter using UJT firing. Single phase half wave controlled converter using R - firing. Single phase half wave controlled converter using RC - firing.

2. 555 FIRING MODULE (PEC14M13) [TOC]

555 Timer based SCR triggering pulse generation. Four No’s firing pulse to trigger SCR for AC converters / regulators applications. 1:1:1 Pulse transformer used for pulse isolation.
One No. potentiometer used to vary the firing angle (180° - 0°). All four pulses terminated on the front panel for external interface with SCR device module(PEC14M15). 24V AC / 1AMP for power circuit input voltage. One No. toggle switch for ON/OFF 24VAC. One No. SCR with snubber circuit forms half wave controlled converter circuit for checking the firing circuit. 230V, 50HZ AC input, fuse provided for over load protection. One no.rocker switch with LED indications for power ON/OFF.
SUGGESTED EXPERIMENTS :
Study of 555 firing circuit. 2. Single phase half wave controlled converter using 555 firing. By external interface with SCR device module (PEC14M15) the following experiments can be connected additionally. Single phase half controlled converter using 555 firing. Single phase fully controlled converter using 555 firing.

3. LINE SYNCHRONIZED FIRING MODULE (PEC14M14) [TOC]

Line synchronized IC based linear firing circuit, Line synchronization achieved by step-down transformer. Four No. firing pulses to trigger four SCRs. 1:1:1 Pulse transformer used for SCR gate pulse isolati d on.
One No . potentiometer used to vary the firing angle (180° - 0°). All four pulses terminated on the front panel for external SCR device module(PEC14M15) interface. Carrier logic implemented for SCR self - start, carrier frequency 4KHz. Debounce logic circuit implemented for gate pulse ON/OFF. One No . toggle switch provided for gate pulse ON/OFF. 230V, 50Hz AC input, fuse provided for over load protection. One No. rocker switch with LED indication for power ON/OFF. Provision to control the firing angle through external [0 - 5V] DC. Provision to control the firing angle through external [4 - 20mA](optional) By external interface with SCR device module (PEC14M15) the following experiments can be conducted.
Single phase half controlled converter Single phase fully controlled converter. Single phase AC regulator.

4. SINGLE PHASE BRIDGE FIRING CIRCUIT WITH PI (PEC14M14 - PI) [TOC]

Line synchronized IC based linear firing circuit for SCR applications. Line synchronization achieved by 230 / 9V step down transformer. Four No’s firing pulses to trigger four SCRs.
1:1:1 Pulse transformer used for gate pulse isolation. One no potentiometer used to vary the firing angle (180 - 0 ). All four pulses terminated on the front panel for external SCR device module interface. Carrier logic circuit implemented for SCR self start, carrier frequency 4KHz. Debounce logic circuit implemented for SCR gate pulse ON/OFF. One No. toggle switch for gate pulse ON/OFF. 230V, 50Hz AC input, fuse provided for over load protection. One No. rocker switch with LED indication for power ON/OFF. Provision to control the firing angle through external 0 to 5V DC. One No. op-amp based analog PI control circuit for closed loop operation. Provision to connect feed back signals to PI control circuit. By external interface with SCR device module (PEC14M15) the following experiments can be conducted. 1. Single phase half controlled converter. 2. Single phase fully controlled converter.

5. CHOPPER FIRING MODULE (PEC14M16) [TOC]

Consists of two no firing pulse to trigger auxiliary, main SCR. Two No’s 1:1 pulse transformer used for gate pulse isolation. One No’s potentiometer used to vary the duty -cycle ratio of PWM signal (10 - 90%). Debounce logic circuit implemented for pulse ON/OFF. Two No’s toggle switch for ON/OFFauxiliary, main SCR pulses
One No’s potentiometer used to vary the duty -cycle ratio of PWM signal (10 - 90%). Debounce logic circuit implemented for pulse ON/OFF. Two No’s toggle switch for ON/OFF auxiliary, main SCR pulses. Necessary test points for triggering circuit study. Auxiliary and main SCR pulses are terminated on the front panel to interface with SCR device module. (PEC14M15) & LC module. 230V AC, 50Hz AC input. +15 / -15V DC for control circuit. Illuminated rocker switch with fuse protection for mains ON/OFF . By external interface with device module (PEC14M15) and L-C module (PEC14M5A) The following experiments can be conducted. 1. Auxiliary SCR commutated chopper. 2. Complementary SCR commutated chopper. 3. Jones chopper. 4. Current commutated chopper. 5. Speed control of PMDC motor (motor optional).

6. CYCLO CONVERTER FIRING MODULE (PEC14M17) [TOC]

Provision to vary frequency & phase angle of SCR triggering pulses. Line synchronized IC based firing circuit for phase control. Line synchronization achieved by step down (12 - 0 - 12V) transformer. One no potentiometer used to vary the firing angle (180 - 0 ). Programmable IC for firing circuit frequency variation. Two No’s toggle switch to select frequency 50Hz, 50 / 2Hz, 50 / 3Hz, 50 / 4Hz. Four No’s gate pulse to trigger four SCR. 1:1:1 pulse transformer used for gate pulse isolation. All four pulses terminated on the front panel for external device module (PEC14M15) interface. Carrier logic circuit implemented, carrier frequency 4KHz. Debounce logic circuit implemented for SCR gate pulse ON/OFF. One no. toggle switch for SCR gate pulse ON/OFF. 230V, 50Hz AC input, fuse provided for over load protection. One no. rocker switch with LED indication for power ON/OFF. By external interface with device module(PEC14M15) and inductive load (PEC13ACC1) step - down cyclo converter experiment can be performed.

7. COSINE FIRING CIRCUIT FOR SCR CONVERTER (PEC14M18) [TOC]

Line synchronized IC based cosine wave crossing firing circuit. Line synchronization achieved by step - down transformer. Op-amp based integrator circuit for cosine wave generator. Four No’s gate pulse to trigger four SCR. 1:1:1 pulse transformer used for pulse isolation.
One No. potentiometer used to vary the firing angle (180° - 0°). All four pulses terminated on the front panel for external device module (PEC14M15) interface. Carrier logic circuit implemented for SCR self - starting. Carrier frequency 4KHz. Debounce logic circuit implemented for SCR gate pulse ON/OFF. One no . toggle switch provided for SCR gate pulse ON/OFF. 230V, 50Hz AC input, fuse provided for over load protection. One No . rocker switch with LED indication for power ON/OFF. By external interface with device module (PEC14M15) the following experiments can be conducted. 1. Single phase half controlled converter. 2. Single phase fully controlled converter. 3. Single phase AC regulator.

8. MICROPROCESSOR BASED SINGLE PHASE SCR TRIGGERING CIRCUIT TRAINER (PEC18MP1) [TOC]

This trainer consists of (1) 8085 with SCR device module. (PEC18MP1)
MICROPROCESSOR TRAINER
8085 Microprocessor (Micro - 85ebII). 8KB RAM, 8KB - EPROM. One 8255 port to provide 24 TTL I / O lines. 21 Keys multifunction key board with double short characters for long life. 6 Digit 7 segment display.
SCR FIRING PULSE INTERFACE CHORD (PEC18MP1)
One no. line synchronized ZCD generator. 230V / 9V step down transformer used for line synchronization. One no. 26 pin header to interface microprocessor kit. Two No’s pulse amplifier with pulse isolation circuits. Two No’s 1:1 pulse transformer provided for gate pulse isolation. All four pulses terminated in the PCB for SCR interface with Four No’s TYN612 SCR with snubber circuit provided for power circuit. All A,K,G terminals are terminated for external power circuit configuration. One no. 230V / 24V AC, 2Amp provided for SCR power circuit input. One no. fixed resistor / lamp used as a load.
SUGGESTED EXPERIMENTS
Single phase half / fully controlled converter with R & L load, Single phase AC regulator with R & L load.

9. MICROPROCESSOR BASED THREE PHASE SCR TRIGGERING CIRCUIT TRAINER (PEC18MP2) [TOC]

This trainer consists of (1) 8085 microprocessor kit, (2) SCR firing pulse interface chord with SCR device module. (PEC18MP2).
MICROPROCESSOR TRAINER : 8085 Microprocessor (Micro - 85ebII) 8 KB RAM, 8KB - EPROM. One 8255 port to provide 24 TTL I/O lines. 21 Keys multifunction key board with double short characters for long life. 6 Digit 7 segment display.
SCR FIRING PULSE INTERFACE CHORD (PEC18MP2)
Three No’s line synchronized ZCD generator . 230V / 9V , Three phase step down transformer used for line synchronization. One No’s 26 pin header to interface microprocessor kit. Six No’s pulse amplifier with pulse isolation circuits. Six No’s 1:1 pulse transformer provided for gate pulse isolation. All six pulses terminated in the PCB for SCR interface with ON/OFF switch.
SCR POWER CIRCUIT (PEC14HV1#P)
Six No’s TYN612 SCR with snubber circuit provided for power circuit. All A,K,G terminals are terminated for external power circuit configuration. One no. three phase 230V / 24V AC, 2Amp provided for SCR power circuit input.
SUGGESTED EXPERIMENTS
Three phase fully controlled converter with R & L load Three phase AC regulator with R & L load

10. TCA-785 IC BASED SINGLE PHASE SCR FIRING CIRCUIT(PEC14M24) [TOC]

It consists of four number of isolated triggering pulse to trigger four scr TCA785 ic used for phase angle variation One number of 230/9v step-down transformer provided for supply synchronization One number of potentiometer provided for phase angle or firing angle variation (180-0 Degree). Carrier logic implemented in the pulses for scr self starting. Pulse transformer provided for scr pulse isolation. 230v ac input,+15vdc for control circuit. Necessary test points provided for wave form measurement. All components are mounted in the pcb fixed with nice cabinets. Facility provided for external control (0-5vdc.)

11. TCA-785 IC BASED THREE PHASE SCR FIRING CIRCUIT(PEC14M25) [TOC]

It consists of six number of isolated triggering pulse to trigger six SCR TCA785 IC used for phase angle variation in all three phase outputs. One number of three phase 230/9v step-down transformer provided for supply synchronization One number of potentiometer provided for phase angle or firing angle variation (180-0 Degree). Carrier logic implemented in the pulses for SCR self starting. Pulse transformer provided for scr pulse isolation. 440v ac input,+15vdc for control circuit. Necessary test points provided for wave form measurement. All components are mounted in the pcb fixed with nice cabinets. Facility provided for external control (0-5vdc)

12.SCR TRIGGERING CIRCUIT TRAINER (PEC14M12E) [TOC]

This setup consists of the following basic firing circuits to trigger SCR. R, RC, Triggering circuits, Basic DC Triggering circuit UJT Triggering circuit Microcontroller based triggering circuit
a. R, RC Triggering circuit
One no. of resistor and one no. of capacitor forms R, RC firing circuit Potentiometer used for firing angle variation Output terminated by connectors. Necessary test points provided
b. Basic DC Triggering circuit :
Variable DC power supply with protection One potentiometer used to vary the DC voltage as well as the firing angle. Necessary test points provided
c. UJT Triggering Circuit :
One no. of 2N2646 UJT used for firing pulse generation. Variable R & C provided for triggering circuits Potentiometer provided for firing angle variation. Pulse transformer provided for pulse isolation 4 Nos. of triggering pulses terminated by suitable connectors. Necessary test points.
d. Microcontroller based Firing circuit :
4 Nos. of triggering pulses terminated by suitable connectors. dsPIC30F4011 based firing pulse generation One no. of pulse output with firing angle variation (0-180 ) One no. of digital key provided for firing angle variation.
e. SCR Module :
One no. of SCR with snubber and heat sink provided Fixed R Load 24V/1A AC Source provided for power

ii. TYPES OF POWER MODULE [TOC]

1.SCR, TRIAC, DIAC DEVICE MODULE (PEC14M15)
2.L-C MODULE (PEC14M5A)
3. SCR MODULE (VPET-106A)
4. TRIAC Module (VPET-106C)
5. DIODE Module (VPET-106D)

1.SCR, TRIAC, DIAC DEVICE MODULE (PEC14M15) [TOC]

It is a common device module, by interface with external firing module it can be used for different applications. Four No’s TYN1225 SCR with fuse protection. A,K,G terminals of all SCR terminated individually for external connection. Four No’s diode with fuse protection . A,K of all diode terminals terminated individually for external connection.
One no . BTA12 TRIAC with fuse protection. MT1,MT2,G terminals are terminated individually for external connection. One no. DIAC with fuse protection. MT1,MT2 terminals are terminated for external connection. 24VDC / 2A unregulated power supply for device DC operation. One no. fuse provided for DC power supply over current protection. One no. toggle switch for ON/OFF 24VDC supply. Snubber circuit provided for all power devices. Low voltage isolation transformer provided for power circuit input Input : 230V AC , 50HZ Output : 24 - 0 - 24V AC, 3AMP. The following experiments can be conducted using external firing module 1.Line commutated converter / regulator applications. 2.Inverter applications. 3.DC chopper applications.

2. L-C MODULE (PEC14M5A) [TOC]

Inductance : 120 μH @ 4 Amp Air core inductor with six tappings. Each tapping is percentage of 120mH (0%, 10%, 20%, 30%, 50%, 75%, 90%, 100%) Combination of commutation capacitors. Used for various commutation circuits in chopper circuit. Housed in a box with sockets termination for all inductors and capacitors tappings.

3. SCR MODULE (VPET-106A) [TOC]

It consist of one number of SCR (metal package) with heatsink is provided . SCR rating is1200v/50Amps. SCR with heatsink is fixed on a open wooden box with G,A,K terminals are brought out by banana socket. RC snubber circuit and fuse are provided

4. TRIAC Module (VPET-106C) [TOC]

It consist of one number of TRIAC (metal package) with heatsink is provided. TRIAC with heatsink is fixed on a open wooden box with G, MT1, MT2 terminals are brought out by banana socket. RC snubber circuit and fuse are provided.

5. DIODE Module (VPET-106D) [TOC]

It consist of one number of diode (metal package)with heatsink is provided . Diode rating is 1200v /50Amps. Diode with heatsink is fixed on a open wooden box with A,K terminals are brought out by banana socket. RC snubber circuit and fuse are provided.

C. LOW VOLTAGE SCR APPLICATION TRAINER [TOC]

1. SINGLE PHASE AC VOLTAGE CONTROLLER (PEC14M14AC)
2. SINGLE PHASE AC VOLTAGE CONTROLLER (PEC14M14AC#1)
3. SINGLE PHASE AC VOLTAGE CONTROLLER USING SCR and TRIAC (PEC14M14AC#2)
4. SINGLE PHASE SCR HALF CONTROLLED CONVERTER (PEC14M14HW)
5. SINGLE PHASE SCR BRIDGE CONVERTER (PEC14M14FW)
6. FORCED COMMUNICATION CIRCUITS (CLASS A, B, C, D & E)COMMUNICATION (CHOPPER) CIRCUIT MODULE).
7.SCR DC CHOPPER CIRCUIT (PEC14M14CH#1)
8. SINGLE PHASE CYCLO CONVERTER (PEC14M14CY)
9. SINGLE PHASE SCR FULL BRIDGE INVERTER (PEC14M14#INV)
10. SCR SERIES INVERTER (PEC14M6)
11. SCR PARALLEL INVERTER (PEC14M7)
12. MORGANS CHOPPER CIRCUIT TRAINER(PEC14M20).
13. JONES CHOPPER TRAINER MODULE(PEC14M21).
14. UJT FIRING CIRCUIT FOR SCR CONVERTER (PEC14M12B)
15. CONTROLLED HWR AND FWR USING RC FIRING (PEC14M12C)

1. SINGLE PHASE AC VOLTAGE CONTROLLER (PEC14M14AC) [TOC]

Consists of firing circuit, SCR power circuit and load. Line synchronized IC based linear firing circuit. Line synchronization achieved by 230 / 9V step - down transformer. Two No’s firing pulses to trigger two SCRs connected in anti - parallel.
1:1:1 Pulse transformer used for SCR gate pulse isolation. One No’s potentiometer used to vary the firing angle (180° - 0°). Carrier logic implemented, carrier frequency 4KHz. One No. toggle switch with debounce logic for pulse ON/OFF. Provision to control the firing angle through external [0 - 5V] DC (optional) Power circuit consists of two No’s SCR with snubber circuit & fuse. Anode, Cathode, Gate terminals are terminated in the front panel for user connection. 24V AC, 1AMP provided for power circuit input with ON/OFF switch. One No. fixed R, L load provided for power circuit. 230V, 50Hz AC input with ON/OFF rocker switch , fuse for over load.
SUGGESTED EXPERIMENTS :
1. Single phase AC regulator with R and R - L load.

2. SINGLE PHASE AC VOLTAGE CONTROLLER (PEC14M14AC#1) [TOC]

Line synchronized IC based linear firing circuit for TRIAC. Line synchronization achieved by 230 / 9V step - down transformer. One No. firing pulse to trigger TRIAC.
1:1 Pulse transformer used for TRIAC gate pulse isolation. One No. potentiometer used to vary the firing angle (180 - 0 ) Provision to control the firing angle through external [0 -5V] (optional). Carrier logic circuit implemented, carrier frequency 4KHz. Debounce logic circuit implemented for gate pulse ON/OFF. One No. toggle switch for gate pulse ON/OFF. One No . TRIAC with snubber & fuse for AC regulator power circuit. 24V AC, lamp with ON/OFF switch for power circuit input. One o . fixed R and L used as load for power circuit. 230V, 50Hz AC input, fuse provided for over load protection. One no. rocker switch for power ON/OFF.
SUGGESTED EXPERIMENTS :
1. Single phase AC regulator using TRIAC with R and RL load.

3. SINGLE PHASE AC VOLTAGE CONTROLLER USING SCR and TRIAC (PEC14M14AC#2) [TOC]

Line synchronized IC based linear firing circuit for TRIAC. Line synchronization achieved by 230 / 9V step - down transformer. One No. firing pulse to trigger TRIAC.
1:1 Pulse transformer used for TRIAC gate pulse isolation. One No. potentiometer used to vary the firing angle (180 - 0 ) Provision to control the firing angle through external [0 -5V] (optional). Carrier logic circuit implemented, carrier frequency 4KHz. Debounce logic circuit implemented for gate pulse ON/OFF. One No. toggle switch for gate pulse ON/OFF. One No . TRIAC with snubber & fuse for AC regulator power circuit. 24V AC, lamp with ON/OFF switch for power circuit input. One o . fixed R and L used as load for power circuit. 230V, 50Hz AC input, fuse provided for over load protection. One no. rocker switch for power ON/OFF.
SUGGESTED EXPERIMENTS :
1. Single phase AC regulator using TRIAC with R and RL load.

4. SINGLE PHASE SCR HALF CONTROLLED CONVERTER (PEC14M14HW) [TOC]

Consists of firing circuit, SCR power circuit and load. Line synchronized IC based linear firing circuit for SCR. Line synchronization achieved by 230 / 9V step - down transformer. Four no . firing pulse to trigger SCR. 1:1 Pulse transformer used for SCR gate pulse isolation. One no . potentiometer used to vary the firing angle (180 - 0d).
Carrier logic implemented, carrier frequency 4KHz. One no. toggle switch with debounce logic for pulse ON/OFF. Provision to control the firing angle through external [0 - 5V]. Power circuit consists of two No’s SCR and two power diode with fuse protection. Anode, Cathode, Gate terminals are terminated in the front panel for user connection. 24V AC, 1AMP provided for power circuit input with ON/OFF switch. One no. fixed R,L load provided. 230V, 50Hz AC input with ON/OFF rocker switch, fuse for over load.
SUGGESTED EXPERIMENTS :
1. Single phase half controlled converter with R and R - L load.

5. SINGLE PHASE SCR BRIDGE CONVERTER (PEC14M14FW) [TOC]

Consists of firing circuit, SCR power circuit and load. Line synchronized IC based linear firing circuit. Line synchronization achieved by step - down transformer. Four no. firing pulses to trigger four SCRs. 1:1:1 Pulse transformer used for pulse isolation. One No . potentiometer used to vary the firing angle (180 - 0 ).
Carrier logic implemented, carrier frequency 4KHz. One no. toggle switch with debouncing logic for pulse ON/OFF. Provision to control the firing angle through external [0 - 5V]. Power circuit consists of four no. SCR with fuse protection. Anode, Cathode, Gate terminals are terminated in the front panel for user connection. 24V AC, 1AMP provided for power circuit input with ON/OFF switch. One no. fixed R, L load provided. 230V, 50Hz AC input with ON/OFF rocker switch, fuse for over load.
SUGGESTED EXPERIMENTS :
1. Single phase fully controlled converter with R and R - L load.

6. FORCED COMMUNICATION CIRCUITS (CLASS A, B, C, D & E) COMMUNICATION (CHOPPER) CIRCUIT MODULE). [TOC]

Consists of firing circuit, SCR power circuit and load. IC based firing circuit to trigger two SCRs. One no. potentiometer used to vary the frequency of firing pulse. One potentiometer used to vary the duty cycle ratio of PWM. Two no. toggle switch with debounce logic for ON/OFF pulses.
Pulse transformer used for gate pulse isolation. Two No’s SCR and one no diode provided with A,K,G terminals are terminated on front panel for external connection. Two No’s fixed R load. Two No’s capacitor and one no fixed inductor for commutation circuit. Separate firing pulse section for line commutation circuit and external pulse commutation circuit. 15V DC, 1AMP for SCR power circuit input and 9V AC for SCR line commutation circuit input. Two no. toggle switch for ON/OFF DC and AC voltage.
SUGGESTED EXPERIMENTS :
Load commutation circuit (class - A). Resonant pulse commutation circuit (class-B). Complementary commutation circuitry (class-C). Impulse / auxiliary commutation circuit (class-D). External pulse commutation circuit (class-E). Line / natural commutation circuit (class- F)

7. SCR DC CHOPPER CIRCUIT (PEC14M14CH#1) [TOC]

Consists of firing circuit, power circuit and load. Firing circuit : IC Based square wave generation. Two No’s firing pulse to trigger auxiliary and main SCR. One potentiometer used to vary the frequency of the firing pulse (100Hz - 300Hz, Approx) One No’s potentiometer used to vary duty cycle ratio. (10% - 90%). Two No’s toggle switch to ON/OFF SCR gate pulses.
Necessary test points to measure control circuit waveform in CRO. Power circuit : Two No’s TYN612 SCR with heatsink, snubber circuit & two No’s power diode provided for power circuit. One no. center tapped inductor, capacitor used for commutation circuits. LM723 Based 24V DC, 2AMP DC power supply with S / C, O / C protection for chopper power circuit input voltage. One no. toggle switch for 24V DC ON/OFF, with LED indication.
SUGGESTED EXPERIMENTS :
Auxiliary SCR commutated chopper. Complementary SCR commutated chopper. Jones chopper.

8. SINGLE PHASE CYCLO CONVERTER (PEC14M14CY) [TOC]

Consists of firing circuit, SCR power circuit and load. Line synchronized IC based linear firing circuit. Line synchronization achieved by step - down transformer. Four No’s firing pulse with pulse transformer isolation to trigger four SCR.
One no. potentiometer used to vary the firing angle (180° - 0°). Carrier logic implemented, carrier frequency 4KHz. One no. toggle switch with debounce logic for pulse ON/OFF. EPROM Based firing pulse frequency variation. Two No’s. toggle switch to select different frequency (50, 50 / 2, 50 / 3,50 / 4 Hz). Power circuit consists of four No. SCR with fuse protection. Anode, Cathode, Gate terminals are terminated in the front panel for user connection. 24V AC, 1AMP Provided for power circuit input with ON/OFF switch. One no. fixed R, load provided. Centre tapped inductor for power circuit. 230V, 50Hz AC input with ON/OFF rocker switch, fuse for over load.
SUGGESTED EXPERIMENTS
1.Single phase cyclo converter with different output frequency with the different voltage

9. SINGLE PHASE SCR FULL BRIDGE INVERTER (PEC14M14#INV) [TOC]

Consists of SCR power circuit and firing circuit. 4046 IC based square wave generation with adjustable frequency. One no. potentiometer used to vary the frequency (10 - 100Hz). 1:1 Pulse transformer used for gate pulse isolation. Pulse output terminated in the front panel for user patching. Power circuit consists of four No’s SCR (TNY612), four no diodes. Two No’s center tapped inductor and capacitors provided for power circuit commutation. LM 723 Based 24V / 2A DC power supply with LED indication. One no. toggle switch used to ON/OFF 24V DC power supply. Over load and short circuit protection provided for DC power supply. 230V, 50Hz AC input, +15V DC / 1AMP for control circuit. One no. fuse provided for power supply protection, necessary test points provided.
SUGGESTED EXPERIMENTS
Study of inverter firing circuit. Testing of SCR inverter with R load with frequency variation.

10. SCR SERIES INVERTER (PEC14M6) [TOC]

Consists of SCR power circuit and firing circuit. IC Based firing pulse generation to trigger SCR. One no. pot used to vary the frequency of firing pulse (300 - 600Hz). One no. toggle switch to ON/OFF SCR gate pulses.
1:1 Pulse transformer used for gate pulse isolation. Pulse output terminated in the PCB for user patching. Power circuit consists of two No’s SCR (TYN612), centre tapped inductor centre tapped capacitor. LM 723 Based 24V / 2A DC power supply with LED indication. One no. toggle switch used to ON/OFF 24V DC power supply. Over load and short circuit protection of input DC. 230V, 50Hz AC input , +15V DC / 1AMP for control circuit. One no. output PI - filter to filter series inverter output voltage. One no. fuse provided for power supply protection, necessary test points provided.
SUGGESTED EXPERIMENTS
Study of series inverter firing circuit. 2.Testing of series inverter with R load with frequency variation.

11. SCR PARALLEL INVERTER (PEC14M7) [TOC]

Consists of SCR power circuit and firing circuit. 4046 IC Based square wave generation with adjustable frequency. One no. potentiometer used to vary the frequency (50 - 100Hz). 1:1 Pulse transformer used for gate pulse isolation.
Pulse output terminated in the PCB for user atching. Power circuit consists of two No’s SCR (TNY612), inverter transformer with flyback winding. One no. Iron core inductor provided for power circuit. One no. AC capacitor for SCR commutation. LM 723 Based 24V / 2A DC power supply with LED indication. One no. toggle switch used to ON/OFF 24V DC power supply. Over load and short circuit protection provided for DC power supply. 230V, 50Hz AC input, +15V DC / 1AMP for control circuit. One no. fuse provided for power supply protection, necessary test points provided.
SUGGESTED EXPERIMENTS
Study of parallel inverter firing circuit. Testing of parallel inverter with R load with frequency variation.

12. MORGANS CHOPPER CIRCUIT TRAINER (PEC14M20). [TOC]

This trainer is designed to implement and demonstrate Morgan chopper circuit.It can be used for speed control of PMDC motor using Morgan chopper.
Over load and short circuit protection provided for DC power supply. 230V, 50Hz AC input, +15V DC / 1AMP for control circuit. Single SCR with snubber circuit and one diode is provided Capacitor and inductor is provided for commutation 24V DC/3 Amp Power supply is provided for chopper input
±15V / 1Amp for internal control circuit Isolation is provided for gate pulse.

13. JONES CHOPPER TRAINER MODULE (PEC14M21). [TOC]

One no. potentiometer used to vary the frequency (50 - 100Hz). 1:1 Pulse transformer used for gate pulse isolation. Two nos. SCR with RC supper provision Two nos. Diodes and one fixed load resistor. One center tapped (0%, 50%, 100%) inductor (120mh) for power circuit with one commutating capacitor
Two isolated firing pulses to fire SCR Two nos. Toggle switches to switch ON Auxiliary SCR pulse and main SCR pulse One 24V/1A Fixed DC Supply for power circuit and one toggle switch to ON/OFF DC supply All input and outputs of Power circuit components (SCR DIODE, LOAD) are terminated in a PCB for student patching Necessary test points for study of firing circuit One Potentiometer for Duty cycle variation.

14. UJT FIRING CIRCUIT FOR SCR CONVERTER (PEC14M12B) [TOC]

Necessary test points for study of firing circuit One Potentiometer for Duty cycle variation. Consists of UJT firing circuit and SCR power circuit and load. Line synchronized UJT firing circuit. Line synchronization achieved by 230 / 9V step - down transformer. Built in 24V AC, 1AMP for UJT firing circuit input.
One no. potentiometer used to vary the firing angle (180° - 0°). Two No. 1:1 pulse transformer provided for gate pulse isolation. All four gate pulses are terminated in the PCB with suitable connector. Four No. TYN612 SCR with snubber circuit for power circuit. All SCR A,K,G terminals are terminated individually for external configuration. 230V / 24V, 2AMP transformer provided for power circuit input voltage. One no. toggle switch to ON / OFF 24V AC. One no. fixed resistor one no fixed inductor provided for load.
SUGGESTED EXPERIMENTS
Study of UJT firing circuit. Testing of single phase fully controlled converter using UJT firing. Testing of single phase half wave controlled converter. Testing of single phase AC regulator using UJT firing

15. CONTROLLED HWR AND FWR USING RC FIRING (PEC14M12C) [TOC]

Two separate sections are provided. a. Half wave rectifier b. Full Wave rectifier
a. Half Wave rectifier
One No. of SCR rated at 600V, 12A is provided R,C Based firing Lamp load is provided One potentiometer is used to vary the firing angle of SCR 230V/24V operation
b. Full Wave Rectifier
One no. toggle switch to ON / OFF 24V AC. One no. fixed resistor one no fixed inductor provided for load. One no. SCR rated at 600V, 12A is provided 4 Nos. of Diode is used R,C Based firing One potentiometer is used to vary the firing angle of SCR. 230V/24V operation

D. HIGH VOLTAGE SCR APPLICATION TRAINER. [TOC]

1. SINGLE PHASE (HALF & FULLY) CONTROLLED BRIDGE CONVERTER (PEC14HV4).
2. THREE PHASE (HALF & FULLY) CONTROLLED BRIDGE CONVERTER (PEC14HV5).
3. SINGLE PHASE DUAL CONVERTER (PEC14HV6A).
4. THYRISTOR DC CHOPPER (PEC14HV7)
5. SINGLE PHASE PARALLEL INVERTER (HIGH VOLTAGE) [PEC14M7HV]
6. THREE PHASE PARALLEL INVERTER (PEC14HV12)
7. SINGLE PHASE SERIES INVERTER (HIGH VOLTAGE) (PEC14HV6)
8. SINGLE PHASE CYCLO CONVERTER (HIGH VOLTAGE) PEC14HV9.
9. SINGLE PHASE MC-MURRAY-BED FORD FULL BRIDGE INVERTER (VPET-111A)
10. THREE PHASE MC-MURRAY-BED FORD FULL BRIDGE INVERTER (VPET-111)
11. THREE PHASE CYCLO CONVERTER (PEC14HV11)
12. THREE PHASE DIODE CHARACTERISTICS TRAINER(PEC14HV5D)

1. SINGLE PHASE (HALF & FULLY) CONTROLLED BRIDGE CONVERTER (PEC14HV4). [TOC]

Specially designed for high voltage operation. It consists of firing module, SCR power circuit and high voltage accessories (optional).
1. FIRING MODULE
Line synchronized op-amp based linear triggering circuit. One no. potentiometer used to vary the triggering angle (0° - 180°d). Line synchronization achieved by step - down transformer. Carrier logic implemented for SCR self - starting.
One no. Toggle switch with debounce logic for pulse ON/OFF. 1:1 Pulse transformer used for gate pulse isolation. Pulse output terminated in the front panel for device module interface.
2. SCR POWER CIRCUIT
Power circuit consists of two no. SCR (TNY1225) rating at 1200V, 25AMP two No’s power diode rating at 1200V, 50AMP).
All terminals of diode and SCRs terminated on the front panel for external connection. One no. MCB provided for mains. Fuse provided in input side.
3. SPECIFICATION
Input ------ [0 - 230V] AC, 50Hz, Output ------ [0 - 200V] DC, 5AMP / 10AMP (optional), [0-230V] AC, 5AMP / 10AMP (optional).
4. SUGGESTED EXPERIMENTS
Single phase half and fully controlled converter with R and RL load. Single phase AC regulator with R and RL load

2. THREE PHASE (HALF & FULLY) CONTROLLED BRIDGE CONVERTER (PEC14HV5). [TOC]

Specially designed for high voltage operation. It consists of three phase firing module, SCR three phase power circuit and high voltage accessories (optional).
1. FIRING MODULE
Line synchronized op-amp based three phase linear triggering circuit. One No. potentiometer used to vary the triggering angle (0° - 180°). Line synchronization achieved but three phase step -down transformer.
Carrier logic implemented for SCR self - starting. One No. Toggle switch with debounce logic for pulse ON/OFF. Six No’s 1:1 pulse transformer used for gate pulse isolation. All six pulses output terminated in the front panel for device module interface
2. SCR POWER CIRCUIT
Power circuit consists of two No. SCR (TNY1225) rating at 1200V, 25AMP two no. power diode rating at 1200V, 50AMP). All terminals of diode and SCRs terminated on the front panel for external connection. One No. MCB provided to ON/OFF input three phase AC, and over current protection. Indicator and fuse provided for mains R,Y,B.
3. SPECIFICATION
Input : [0 - 440V] AC, 50KHz, Output : [0 - 600V] DC, 5AMP / 10AMP (optional), Three phase converter. 0- 440V AC , 5AMP / 10AMP (optional), Three phase regulator.
4. SUGGESTED EXPERIMENTS
Three phase half and fully controlled converter with R and RL load. (optional) Three phase AC regulator with R and RL load. (load optional).

3. SINGLE PHASE DUAL CONVERTER (PEC14HV6A). [TOC]

a. Firing Module
8 nos. Isolated gate pulses for `P' group and `N' group SCR converter One DPDT switch is provided for selection of Dual converter with circulating current mode and without circulating current mode Two nos. potentiometer to vary the firing angle of with circulating current mode and without circulating current mode
One pulse ON/OFF switch and power ON/OFF switch is provided Necessary test points provided for student measurement ±15V DC & 9V AC for control circuit All components are housed in a fine screen printed cabinet
b. Power Circuit
±15V DC & 9V AC for control circuit All components are housed in a fine screen printed cabinet 8 Nos. of SCR with snubber protection is provided for `P',`N' group converter All `A', `K' terminals are terminated in front panel for student patching 25 pin shielded cable for pulse input Two Nos. 230/24V, 3A step down transformer for power circuit input AC voltage One Center tapped inductor (0%,50%,100%) for power circuit with circulating current mode (Optional) All components are housed in a fine screen printed cabinet

4. THYRISTOR DC CHOPPER (PEC14HV7) [TOC]

Consists of SCR power circuit and firing circuit. IC Based firing pulse generation to trigger auxiliary and main SCR. Pulse transformer provided for gate pulse isolation. One potentiometer used to vary the duty cycle ratio of PWM (10 - 90%).
Two no. toggle switch with debounce logic for ON/OFF gate pulse. Power circuit consists of two no’s TYN1225 SCR, diode forms auxiliary SCR commutation circuit. Fixed L - C provided for power circuit commutation. One no. diode bridge converter with filter capacitor convert input 230V AC to DC for power circuit input. MCB Provided for input AC ON/OFF, over current protection. One no. diode converter provided for field circuit (DC motor control experiment optional). 230V, 50Hz Input . Built in +15, -15V DC for control circuit. Provision to control the duty cycle ratio from external source voltage [0 - 5V]. Power ON/OFF switch, necessary test points for firing circuits
SUGGESTED EXPERIMENTS
High voltage auxiliary SCR commutated chopper with R, RL load Speed control of DC shunt motor using SCR chopper.

5. SINGLE PHASE PARALLEL INVERTER (HIGH VOLTAGE) [PEC14M7HV] [TOC]

Input : 24V DC, 2Amp Output Voltage : a. 230V AC, 50VA b. 24V AC, 50VA Output Frequency : 50Hz to 100Hz (Variable)
It consists of 3 separate sections which is as follows.
Parallel Inverter firing circuit SCR power circuit 24V DC Source.
a. Parallel Inverter Firing Circuit :
4046 VCO Based square wave generation with adjustable frequency (50 to 100Hz) Square wave modified into short pulses by control ICs. Two nos of 1:1 Pulse transformer provided for pulse Isolation Pulses imposed with high frequency square (4KHz) for SCR self start 7 Nos. of test points provided for signal test/measure purpose
b. Power Circuit :
It consists of two nos. of SCRs rating at 600V, 12A with heat sink is provided Two nos.of power diode provided. One no. of output transformer is provided. #Input : 24V (with 5 tappings) #Output : 230V, 24V One no. of Iron core Inductor is provided (100mH, 1Amp) One no.fuse is provided for over load protection One no. AC Capacitor provided for SCR commutation
c. 24V DC Source
It consists of LM723 based voltage regulator provided for DC input to SCR power circuit Rating : 24V DC, 2 Amps. One no. of toggle switch provided for DC ON/OFF One LED Indication Current fold back facility provided for output Over current/Short circuit
Documentation Support :
One no. of technical / User manual with circuit diagram
Experiments :
Study of Parallel inverter firing circuit Study of SCR parallel inverter with different frequency Calculation of SCR turn ON/OFF time of SCR parallel inverter
Protection :
Output Over Load or short circuit protection
Input :
230V AC ± 5%, 50Hz operation

6. THREE PHASE PARALLEL INVERTER (PEC14HV12) [TOC]

This trainer is designed to study the working principle of three phase parallel inverter. This set up consists of, a. Three phase parallel inverter firing circuit b. Parallel inverter power circuit c. LM723 based 23V DC source.
a. Three phase Parallel Inverter Firing Circuit
IC Based 3φ square wave generation with 120 phase shift with frequency variation. One number of potentiometer provided for frequency adjustment (20-60Hz) Six numbers of pulse transformer provided for SCR gate pulse isolation Gate carrier logic implemented for SCR gate pulses. One number of toggle switch with debounce logic provided for all six pulse ON/OFF. All pulses are terminated in the front panel for SCR patching Necessary test points provided on the control circuit for waveform measurement.
b. Parallel inverter Power Circuit :
Six number of TYN 1225 SCR with suitable heat-sink, snubber circuit provided for power circuit. Six number of power diode provided for fly-back operation. Three number of ac capacitor provided for SCR commutation One number of three phase 24-24-0-24/24.0-24V,3Amp transformer provided for parallel inverter power circuit Necessary terminals of SCR, diode, transformer are terminated in the panel for wiring.
c. LM723 based 24V DC Source for parallel inverter input :
LM723 based 24V power supply provided for parallel inverter input. 3 Amp Capacity. Overload, short circuit protection facility LED provided for DC indication.

7. SINGLE PHASE SERIES INVERTER (HIGH VOLTAGE) (PEC14HV6) [TOC]

This module is designed to demonstrate the working principle of Thyristorised Series Inverter.
MAIN CIRCUIT
2 SCRs : Rating : 600V @ 12Amp A Potentiometer is provided to vary the load power. Snubber circuit is provided to each devices. Circuits for commutation triggering SCRs are provided.
POWER SUPPLY
Input 230V ±10%, 50Hz single phase AC 24 Volt DC @ 2 Amp to feed inverter. ±15V DC @ 0.5A regulated output for the trigger circuits.

8. SINGLE PHASE CYCLO CONVERTER (HIGH VOLTAGE) PEC14HV9. [TOC]

This module is designed for center tap transformer Cyclo Converter.It consists of 4 synchronized firing pulses, 4 SCRs, Relevant Power supply etc, for frequency division of 1,2,3 & 4.
Main Circuit
4 SCRs : Rating 1200V @ 25Amp 4 Synchronized firing pulses to trigger SCRs Digital firing for frequency division of 1,2,3 & 4.
Power Supply
Input 230V ±10%, 50Hz single phase AC ±15V DC @ 0.5A regulated output for the trigger circuits. Center tape Transformer.
Output
0-230Volt AC Frequency : 50/2 HZ, 50/3 HZ & 50/4 HZ. The output can be loaded with R,L or AC MOTOR (0.5hp).
Experiment :
Study of Speed control of AC motor using Cyclo Convertor.

9. SINGLE PHASE MC-MURRAY-BED FORD FULL BRIDGE INVERTER (VPET-111A) [TOC]

Four isolated gate pulses are provided to fire the Four number of SCRs. One Potentiometer provided to vary the frequency of the inverter from 10Hz - 50 Hz One Potentiometer provided to vary the frequency of the inverter All gate pulses are Isolated by pulse isolation transformer Four SCRs rated 1200V/25A provided Two Diodes rated 1200V/6A provided 4 Nos. of Commutating capacitors and 1 No. of center tapped inductors (Rating at 120mH, 4A) provided. All SCRs, Diodes, Capacitors & Inductors forms Single phase inverter with 180° mode conduction DC Input of inverter fed from three phase SCR converter

10. THREE PHASE MC-MURRAY-BED FORD FULL BRIDGE INVERTER (VPET-111) [TOC]

Six isolated gate pulses are provided to fire the six number of SCRs. One Potentiometer provided to vary the frequency of the inverter from 10Hz - 50 Hz
One Potentiometer provided to vary the frequency of the inverter All gate pulses are Isolated by pulse isolation transformer Six SCRs rated 1200V/25A provided Six Diodes rated 1200V/6A provided 6 Nos. of Commutating capacitors and 3 Nos. of center tapped inductors (Rating at 120mH, 4A) provided. All 6 Nos. of SCRs, Diodes, Capacitors & Inductors forms 3 phase inverter with 180° mode conduction DC Input of inverter fed from three phase SCR converter

11. THREE PHASE CYCLO CONVERTER (PEC14HV11) [TOC]

This module is designed for three phase half wave - step down cycloconverter. It consists of 18 Synchronized firing pulses, 18 SCRs, Relevant power supply and circuitry for frequency divisions
Main Circuit :
18 Nos SCR with RC snubber protection is provided for 3φ cycloconverter power circuit (each phase consist of 6 SCRs) Rated at 1200 V @ 25 Amps. 3 NOs centre tapped inductor (0%. 50%, 100%) is provided for power circuit. 18 Nos isolated gate pulses for SCR power circuit. One potentiometer is provided to vary the frequency. One potentiometer is provided to vary the output voltage.
MCB protection. Housed in sleek screen printer cabinet. Provision for V/F control
Power Supply :
Input 440V ± 10%, 50Hz three phase AC supply. ± 15V DC, 9V, 9V,9V AC(3φ) for the firing circuits.
Output Ranges :
Frequency Variation : 1 Hz to 1/3 rd of supply frequency (Approx : 1 Hz to 16Hz) Voltage Variation : 0 to 90% of supply voltage.

12. THREE PHASE DIODE CHARACTERISTICS TRAINER(PEC14HV5D) [TOC]

It consists of 6 Nos. of power diode rating at 1200V, 25Amps All diodes A,K terminals are terminated individually for different configuration
Fuse provided for protection MCB Provision for 3φ ON/OFF. Three phase step down transformer provided for low voltage operation. #Input : 230V,230V,230V,3φ #Output : 24,24,24,3φ, 3Amps. 4 Nos. of Hall effect current sensor provided to measure input current and output current. One no. of hall effect voltage sensor provided to measure the output voltage
Experiments :
3φ Half wave rectifier Common Cathode arrangement with R Load 3φ Half wave rectifier Common Anode arrangement with R Load 3φ Bridge rectifier with R Load.

E. SCR BASED AC/DC DRIVES [TOC]

1. DC MOTOR SPEED CONTROL TRAINER (PEC04)
2. SPEED CONTROL OF SINGLE PHASE INDUCTION MOTOR (PEC14HV4C)
3. SPEED CONTROL OF THREE PHASE INDUCTION MOTOR CONTROLLER USING SCR INVERTER (PEC14HV5C)
4. SPEED CONTROL OF DC SHUNT MOTOR USING THREE PHASE FULLY CONTROLLED CONVERTER (VPET-301)
5.CLOSED LOOP SPEED CONTROL OF PMDC MOTOR USING SCR CONVERTER (PEC-03A)
6.SPEED CONTROL OF DC SHUNT MOTOR USING SCR DUAl CONVERTER (PEC14HV6A)
7. DUAL CONVERTER POWER CIRCUIT (PEC14HV6B).
8. THYRISTOR DC CHOPPER (PEC14HV7)
9. SPEED CONTROL OF SINGLE PHASE INDUCTION MOTOR USING CYCLO CONVERTER (PEC14HV9)
10. SPEED CONTROL OF THREE PHASE SLIP RING INDUCTION MOTOR USING STATIC KRAMER DRIVE (PEC16HV10B)
11. DC SERIES MOTOR CONTROLLER USING JONES CHOPPER (PEC14M21A)
12. AC SERVO MOTOR POSITION CONTROL TRAINER (PEC - 02)
13. OPEN/CLOSED LOOP SPEED CONTROL AND TRANSFER FUNCTION OF AC SERVO MOTOR TRAINER (PEC 00A)
14. TRANSFER FUNCTION OF AC SERVO MOTOR (VPET - 302)
15. TRANSFER FUNCTION OF DC SERVO MOTOR (VPET - 300A)
16. DC MOTOR / GENERATOR TRANSFER FUNCTION STUDY TRAINER (PEC14HV1)
17. WARD - LEONARD SPEED CONTROL SYSTEM OF DC SHUNT MOTOR(PEC14HV2)
18. MICRO CONTROLLER BASED SLIP RING INDUCTION MOTOR SPEED CONTROL USING STATIC KRAMMER DRIVE (PEC16HV10B)
19. DSP BASED STATIC KRAMMER DRIVE (PEC16HV10C)

1. DC MOTOR SPEED CONTROL TRAINER (PEC04) [TOC]

This trainer is designed to drive the 1 HP DC motor (optional) both open loop and closed loop. Both armature control and field control facility provided. It consists of SCR based fully controlled converter for armature voltage variation (0 - 200V DC variable, 5Amp capacity ).
One no. SCR based fully controlled converter for field voltage adjustment (100 - 220V DC variable, 1 AMP). Two sets of op-amp based linear triggering circuit for SCR voltage. One no. rotary switch to select open loop, closed loop-1 and closed Loop-II. Two No’s potentiometer used to vary armature & field voltage. Over current & field failure protection provided. MCB for input ON/OFF. Shut down status indicator and reset switch for protection circuit. One no. Hall - effect current sensor for current feed back, closed loop and protection. One no. digital speed indicator to indicate set speed and actual speed. One no. toggle switch to select the feedback circuitry. Provision to control the motor speed through external [0 - 5V] DC source. 230V, 50Hz AC input, +15V / -15V DC for control circuits
SUGGESTED EXPERIMENTS
Open loop armature control of DC shunt motor . Closed loop armature control of DC shunt motor (speed / current feedback) Field control of DC shunt motor.

2. SPEED CONTROL OF SINGLE PHASE INDUCTION MOTOR (PEC14HV4C) [TOC]

This trainer is designed to drive the single phase AC induction motor or universal motor using SCR based V / F controller. (open / closed loop). SCR Based single phase converter and inverter forms V / F controller. Variable voltage achieved by controlling the firing angle of SCR converter. Variable frequency achieved by controlling the firing pulse frequency of SCR Mc-Murray inverter.
SCR CONVERTER AND FIRING CIRCUIT
Op-amp based linear firing circuit gives 0° - 180°d firing angle variation. One no. potentiometer used to vary the firing angle adjustment. All four pulses isolated by pulse transformer and terminated in the front panel. Four No’s TYN1225 SCR forms single phase fully controlled converter with LC Filter gives 300V DC to SCR inverter. MCB and fuse (DC side) provided for over current protection.
SCR MC-MURRAY INVERTER AND FIRING CIRCUIT
Over current & field failure protection provided. MCB for input ON/OFF. Shut down status indicator and reset switch for protection circuit. IC based firing circuit with variable frequency (10 - 50Hz). [0 - 5V] DC adjust the firing angle frequency. Four No’s Firing pulse with pulse transformer isolation terminated in the front panel. Four No’s TYN612 SCR and four No’s diode forms power circuit. Four no. Capacitor and two No’s Center tapped inductor for commutation. Separate control circuits for adjusting V / F ratio. Provision to control the V / F ratio in external [0 - 5V] DC (closed loop) Input : 230V AC Output : [0 - 230V] variable AC and [10-50Hz] variable frequency Current : 7.5Amp

3. SPEED CONTROL OF THREE PHASE INDUCTION MOTOR CONTROLLER USING SCR INVERTER (PEC14HV5C) [TOC]

This trainer is designed to drive the three phase AC induction motor using SCR based V/F controller. (open / closed loop). SCR based three phase converter and inverter forms V / F controller. Variable voltage achieved by controlling the firing angle of SCR converter. Variable frequency achieved by controlling the firing pulse frequency of SCR Mc-Murray inverter.
SCR CONVERTER AND FIRING CIRCUIT
Op-amp Based linear firing circuit gives [0°-180°d] firing angle variation. One no. potentiometer used to vary the firing angle adjustment. All six pulses isolated by pulse transformer and terminated in the front panel. Six No’s TYN1225 SCR forms single phase fully controlled converter with LC filter gives 600V DC to SCR inverter. MCB and fuse (DC side ) provided for over current protection. DC voltmeter provided for DC rail voltage measurement.
SCR MC-MURRAY INVERTER AND FIRING CIRCUIT
IC Based three phase firing circuit with variable frequency (10 - 50 Hz). [0 - 5V] DC adjust the firing angle frequency. Six No’s Firing pulse with pulse transformer isolation terminated in the front panel. Six No’s TYN612 SCR and six No’s diode forms power circuit. Six No’s capacitor and three No’s center tapped inductor for commutation. Separate control circuits for adjusting V / F ratio. Provision to control the V / F ratio in external [0 - 50V] DC (closed loop). Input :440V AC 3 phase Output :[0 - 415V] variable AC and [10-50 Hz] variable frequency Current :5Amp.

4. SPEED CONTROL OF DC SHUNT MOTOR USING THREE PHASE FULLY CONTROLLED CONVERTER (VPET-301) [TOC]

This set-up is designed for speed control of dc motor both armature and field control method. Separate pid controller can be used for armature closed operation.
It consists of a. SCR based three phase fully controlled converter for dc motor armature circuit. b. Scr based single phase half controlled converter for motor field circuit c. Digital pid controller for closed loop operation d. 1 hp 440vdc shunt motor set-up.
a. Scr three phase fully controlled converter for armature voltage variation:
Three number of TCA785 phase control ic provided for three phase scr firing pulse generation. One number of potentiometer provided for firing angle variation(180-0degree). Three phase step-down transformer provided for supply synchronization. Six number of Pulse transformer provided for scr pulse isolation One number of Spdt switch provided for pulse on/off. All six pulses are terminated on the front panel for power circuit connection. Test points provided for wave form measurement. Connector provided for external 0-5v control ( for closed loop operation) One number of spdt switch provided for internal /external mode selection. Six number of tyn1225 scr with suitable snubber and heat sink provided for Power circuit. All six scr forms three phase fully controlled converter power circuit. Power circuit input and outputs are terminated by banana connector on the front panel. Three phase mcb provided for input on/off. With indicator Input : three phase 415v ac Output: 0-550vdc,5amp
b. Scr single phase half controlled converter for field voltage variation:
One number of TCA785 phase control ic provided for scr firing pulse generation. One number of potentiometer provided for firing angle variation(90-20degree). Single phase step-down transformer provided for supply synchronization. Two number of Pulse transformer provided for scr pulse isolation One number of Spdt switch provided for pulse on/off. All two pulses are terminated on the front panel for power circuit connection. Test points provided for wave form measurement. Two number of tyn1225 scr with suitable snubber and heat sink provided for Power circuit. All two scr ans diode forms single phase half controlled converter power circuit. Power circuit input and outputs are terminated by banana connector on the front panel. Input : Single phase 230v ac Output : 100-200vdc,1amp Protection circuit: over current protection Field failure protection
c. Digital PID controller for closed operation.
Intel 8051 Microcontroller based CPU card 2 Row x 16 Column LCD Dot Matrix with back light Display Alphanumeric Display single Channel Single ended Analog Input Range : (0-5)V DC Single Channel Analog Output (0-5) Volt One I/V Converter and V/I converter provided 4 Number of keys provided to give setpoint, increment, Decrement function etc. In-Built IC regulated power supply Provision to change any one of the following, Input : (0-5)V Output : (0-5)V
d. Motor set-up
1hp DC shunt Motor Armature voltage-440vdc,2amp Field voltage ------220vdc, .5amp Speed 1500rpm double side shaft extension Speed sensor with speed display and speed feed back(0-5vdc) facility mechanical spring balance load set-up

5.CLOSED LOOP SPEED CONTROL OF PMDC MOTOR USING SCR CONVERTER (PEC-03A) [TOC]

This experiment setup consists of a 180Volt Permanent Magnet DC motor, SCR control module to drive the DC motor, 3½ digit digital speed indicator and optional speed measurement & control module which is interface to a Microprocessor kit or an IBM PC computer
FEATURES:
180V Permanent Magnetic DC motor is provided Line commutated SCR converter to feed the armature Voltage of the DC Motor Phase angle firing A Potentiometer is provided for setting the speed . Sensor for speed sensing provided A Digital Indicator with 3½ digit LED display for standalone operation (Open Loop) to indicate the speed of the DC motor Can Operate in i) Stand alone mode (Only open loop) ii) Microprocessor controlled iii) IBM PC Computer controlled
SPECIFICATIONS :
CONVERTER :
SINGLE PHASE FIRING BRIDGE CIRCUIT:
Four Isolated gate signals for Full Bridge converter Firing Angle vary from 180° to 0° through Ramp and pedestal control Gated carrier source at 4 KHz
SCR CIRCUIT :
Four thyristors are provided Snubber circuit is provided to each device All gate signals are feed through polarized connectors. Thyristor power pack used to provide variable field voltage of DC Motor.
OTHER FEATURES :
One F/V converter provided to convert the pulses of the speed sensor to voltage One 3½ digit display provided to display the actual and reference speed. Opto coupler is provided for coupling Pulse transformer provided for coupling Pulse transformer provided to isolate low power and high power sides of the circuitry
APPLICATIONS :
Study of Thyristor control of DC Motor Measure the speed of DC motor Display the speed of DC Motor Establish an open loop control Study of DC variable Speed Drive

6.SPEED CONTROL OF DC SHUNT MOTOR USING SCR DUAl CONVERTER (PEC14HV6A) [TOC]

Consists of dual converter firing circuit and SCR power circuit
FIRING CIRCUIT (PEC14HV6A)
Two sets of op-amp based linear firing circuits for +ve & -ve group SCRs. 8 No’s of triggering pulse with 1:1 pulse transformer isolation.
One No. SPDT with debounce logic for all pulse ON/OFF. One no. toggle switch to select circulating/ non circulating current mode operation. Two No. potentiometer used for firing angle adjustment in two modes. Necessary test points for control circuits.

7. DUAL CONVERTER POWER CIRCUIT (PEC14HV6B). [TOC]

Six No’s TYN612 SCR and six No’s diode forms power circuit. Six No’s capacitor and three No’s center tapped inductor for commutation. Four No. TYN1225 SCR based fully controlled converter for +ve group converter. Four no. TYN1225 SCR based fully controlled converter for -ve group converter. All SCR gate pulses and necessary terminals are brought out for external connection. One no. 120mH center tapped inductor used for IGR.
SUGGESTED EXPERIMENTS
Testing of dual converter with / without circulating current mode.

8. THYRISTOR DC CHOPPER (PEC14HV7) [TOC]

Consists of SCR power circuit and firing circuit. IC Based firing pulse generation to trigger auxiliary and main SCR. Pulse transformer provided for gate pulse isolation. One potentiometer used to vary the duty cycle ratio of PWM (10 - 90%).
Two no. toggle switch with debounce logic for ON/OFF gate pulse. Power circuit consists of two no’s TYN1225 SCR, diode forms auxiliary SCR commutation circuit. Fixed L - C provided for power circuit commutation. One no. diode bridge converter with filter capacitor convert input 230V AC to DC for power circuit input. MCB Provided for input AC ON/OFF, over current protection. One no. diode converter provided for field circuit (DC motor control experiment optional). 230V, 50Hz Input . Built in +15, -15V DC for control circuit. Provision to control the duty cycle ratio from external source voltage [0 - 5V]. Power ON/OFF switch, necessary test points for firing circuits.
SUGGESTED EXPERIMENTS
High voltage auxiliary SCR commutated chopper with R, RL load Speed control of DC shunt motor using SCR chopper.

9. SPEED CONTROL OF SINGLE PHASE INDUCTION MOTOR USING CYCLO CONVERTER (PEC14HV9) [TOC]

This module is designed for center tap transformer Cyclo Converter. It consists of 4 synchronized firing pulses, 4 SCRs, Relevant Power supply etc, for frequency division of 1,2,3 & 4.
Main Circuit
4 SCRs : Rating 1200V @ 25Amp 4 Synchronized firing pulses to trigger SCRs Digital firing for frequency division of 1,2,3 & 4.
Power Supply
Input 230V ±10%, 50Hz single phase AC ±15V DC @ 0.5A regulated output for the trigger circuits. Center tape Transformer.
Output
0-230Volt AC Frequency : 50/2 HZ, 50/3 HZ & 50/4 HZ. The output can be loaded with R,L or AC MOTOR (0.5hp).
Experiment :
Study of Speed control of AC motor using Cyclo Convertor.

10. SPEED CONTROL OF THREE PHASE SLIP RING INDUCTION MOTOR USING STATIC KRAMER DRIVE (PEC16HV10B) [TOC]

This setup designed for open loop speed control of 3 phase Slip Ring induction motor using SCR converter & inverter circuit.
It consists of three major parts namely,
SCR 3 phase inverter SCR 3 phase inverter firing circuit Slip ring induction motor setup with rotor converter circuit & RL For DC filtering
SCR 3 phase Inverter :
It consists of 6 Nos. of SCRs rated at 1200V, 50Ampwith suitable heat sinks to form 3 phase fully controlled converter work as a 3phase inverter (α > 90°)
SCR 3 phase inverter firing circuit :
Six Isolated gate signals for Full Bridge Converter. Firing Angle variable from 180° to 0°through Ramp and pedestal control. Gated carrier source at 4 KHz. Housed in a Sleek cabinet. Test points are provided on the front panel for detailed study of circuit signals by the student. Necessary test points are terminated at sockets so that the student can monitor/ measure/study the signals using CRO, DVM, etc., One potentiometer to vary the firing angle. One ON/OFF switch with indicator provided to power the control circuitry so that the students can monitor all the test points of the control circuitry for correct functioning.
Slip ring motor with diode bridge rectifier :
3 phase 3 hp slip ring induction motor # Make : Benn # Volts : 400/440V, 3 phase, 50 Hz # 2.2 KW (3 hp), RPM : 1440 # 4.5 Amps # Rotor Volts : 210 Volt # Rotor Current : 6 Amps
One no. of 3 phase bridge rectifier is provided to convert rotor circuit volt 13%, 210V to DC One no. of 'L' & 'R' provided for DC filtering Necessary test points provided for easy study Entire control circuit mounted inside a compact box Mimic circuit is drawn in the front panel Many test points are provided along with front panel A Nice text-lab manual is provided Power Supply : # Input:230V ± 10%, 3 phase AC # ±15V DC @ 0.5A regulated output for the control circuitry.

11. DC SERIES MOTOR CONTROLLER USING JONES CHOPPER (PEC14M21A) [TOC]

This setup designed for open loop & closed loop speed control of DC Series motor using SCR Jones chopper circuit.
It consists of, a.SCR Jones chopper firing and power circuit b.DC Motor setup c.Digital PI Controller d.Isolation transformer.
a.SCR Jones chopper firing and power circuit:
Two nos. SCR with RC snupper provision Two nos. Diodes and one fixed load resistor One center tapped (0%, 50%, 100%) inductor (120mH) for power circuit with one commutating capacitor
Two isolated firing pulses to fire SCR Two nos. Toggle switches to switch ON Auxiliary SCR pulse and main SCR pulse One 300V Fixed DC Supply for power circuit and one toggle switch to ON/OFF DC supply All input and outputs of Power circuit components (SCR DIODE, LOAD) are terminated in a PCB for student patching Necessary test points for study of firing circuit One Potentiometer for Dutycycle variation.
b. DC Series Motor
Many test points are provided along with front panel A Nice text-lab manual is provided 1hp Armature voltage-220vdc,5amp Speed 1500rpm Double side shaft extension Speed sensor with speed display and speed feed back(0-5vdc) facility Mechanical spring balance load set-up
c. Digital pid controller for closed operation.
Many test points are provided along with front panel A Nice text-lab manual is provided Intel 8051 Microcontroller based CPU card 2 Row x 16 Column LCD Dot Matrix with back light Display Alphanumeric Display single Channel Single ended Analog Input Range : (0-5)V DC Single Channel Analog Output (0-5) Volt One I/V Converter and V/I converter provided 4 Number of keys provided to give setpoint, increment, Decrement function etc. In-Built IC regulated power supply Provision to change any one of the following, Input : (0-5)V Output : (0-5)V

12. AC SERVO MOTOR POSITION CONTROL TRAINER (PEC - 02) [TOC]

This trainer designed for versatile applications/Experiments mentioned above. It consists of,
An AC Servo motor mounted on a open frame Power driver to control speed of the motor To study speed servo control of AC servo motor. One Optical sensor provided for speed sensor and display on a 3½ digit display
This trainer system is a compact & advanced version for class room experiment set up for the students to operate and study a practical speed measurement using AC Servo motor.
FEATURES:
One 230V/11.5 (Control Voltage) Two phase AC servo motor mounted on a open frame Speed Range : 0 to 1500 RPM geared down in 1:30 ratio One Optical sensor coupled to shaft to measure speed. AC Servo Motor's speed is controlled by varying control voltage (11.5V) Direction of the motor is varied by phase reversal of the control voltage Mechanical loading arrangement provided
POWER SUPPLY :
Input 230V ±10%, 50Hz, Single phase AC ±15V at 0.5A DC regulated output for control circuitry
EXPERIMENTS :
Speed measurement of AC servo motor using optical sensor. Study of closed loop control of a AC servo motor Study of Characteristics of AC servo motor i. Speed Vs Armature Voltage ii. Speed Vs Torque iii. Armature current Vs torque To determine the transfer function of the AC servo motor.

13. OPEN/CLOSED LOOP SPEED CONTROL AND TRANSFER FUNCTION OF AC SERVO MOTOR TRAINER (PEC 00A) [TOC]

Single Channel Analog Output (0-5) Volt One I/V Converter and V/I converter provided This trainer is designed to drive the two phase AC servo motor both open loop and closed loop. And study of transfer function of motor.
Two phase AC servo motor : Main winding voltage : 230V AC Control winding voltage : 12V AC Speed : 1500RPM Mechanical loading arrangement. Speed sensor (optical type) fixed on the motor shaft for feedback & speed display. It consists of SCR based AC regulator for control winding voltage variation (0 - 12V AC variable, .5Amp capacity). Op-amp based linear triggering circuit for SCR AC regulator. One no. toggle switch to select open loop, closed loop-operation. One no. digital speed indicator to indicate set speed and actual speed. Provision to control the motor speed through external 0 - 5V DC source. 230V, 50Hz AC input, +15V / -15V DC for control circuits.
SUGGESTED EXPERIMENTS
Open loop speed control of AC servo motor Closed loop speed control of AC servo motor Transfer function of AC servo motor

14. TRANSFER FUNCTION OF AC SERVO MOTOR (VPET - 302) [TOC]

This setup consists of i.100W Two phase AC servo motor setup ii.Variable AC voltage source
i. 100W Two Phase AC servo motor setup
Main winding voltage 230V AC Control winding voltage 0-230V AC (90° phase shift) Optical speed sensor for speed measurement Belt type mechanical loading arrangement Speed (0-1500 RPM) Power - 100W
ii. Variable AC voltage source
One number of 1 Φ,1 Amp Auto transformer provided to vary 0-230V AC for control unit One number of Phase shift transformer provided for 90° Phase shifting of main wing voltage Fuse provided for CW over current protection Illuminated power ON/OFF switch provided for CW & MW voltage input
One No. of digital ammeter provided for control winding current measurement One No. of Digital voltmeter provided for control winding voltage measurement One No. of MC Based digital speed indicator for motor speed measurement 3 Φ Input, all are mounted on a nice cabinet One no. of Experimental manual
List of Experiments
Measurement of motor transfer function Speed control of AC servo motor

15. TRANSFER FUNCTION OF DC SERVO MOTOR (VPET - 300A) [TOC]

This setup consists of, a. 100W DC Separately excited DC servo Motor setup b. Variable AC/DC source with meter setup
a. 100W Separately Excited DC Servo Motor :
Armature Voltage : 0-48V DC, 2.7 Amp Field Voltage : 0-48V DC Shunt type separately excited Speed : 1500 rpm Rating : 100W One Optical Encoder provided to sense the speed One 3½ Digital Display provided to display the speed Double side shot extension with speed indication Mechanical loading arrangement
b. Variable AC/DC Source :
One no. of LM723 based 0-50V/3A Variable DC Source with Short circuit, Over load protection for Armature Voltage variation One no. of LM723 based 0-50V/1A DC Variable source with short circuit, Over load protection for field section One no. of Isolated 0-50V AC/1Amp variable AC source for motor inductance measurement One no. of DC digital voltmeter (0-50V) provided for Armature voltage measurement One no. of DC digital ammeter (0-5A) provided for Armature current measurement. One no. of (0-50V) DC digital meter provided for Field Voltage measurement One no. of (0-2A) DC digital ammeter provided for field current measurement One no. of (0-50V)AC digital Voltmeter for AC Voltage measurement One no. of (0-1)A AC digital ammeter for AC current Measurement One no. of Digital stop-clock provided for time
List of Experiments :
Determination of Armature & Field parameters Determination of Motor mechanical parameters Derivation of "Transfer Function" of Separately excited Motor.
Transfer function of DC Servo Motor
This setup consists of,
100W DC Separately excited DC servo Motor setup. Manual.
a. 100W Separately Excited DC Servo Motor :
3 Φ Input, all are mounted on a nice cabinet One no. of Experimental manual Armature Voltage : 0-48V DC, 2.7 Amp Field Voltage : 0-48V DC Shunt type separately excited Speed : 1500 rpm Rating : 100W One Optical Encoder provided to sense the speed One 3½ Digital Display provided to display the speed Double side shot extension with speed indication Mechanical loading arrangement
b.Manual :
Detailed Experimental Manual provided to explan : # To measure the motor parameters # Determination of Transfer function.

16. DC MOTOR / GENERATOR TRANSFER FUNCTION STUDY TRAINER (PEC14HV1) [TOC]

This trainer is designed to drive the 1HP DC motor (optional), So that varies parameters of DC motor/generator can be found experimentally. It consists of SCR based fully controlled converter for armature voltage variation (0 - 200V DC variable , 5 AMP capacity).
3 Φ Input, all are mounted on a nice cabinet One no. of Experimental manual One no. SCR based fully controlled converter for field voltage adjustment (100 - 220V DC variable, 1AMP). One no. SCR based AC regulator for motor / generator winding inductance measurement (0 - 100V, 1AMP variable). One no. diode bridge converter for DC generator field voltage (200V fixed) Four No’s DPM for armature current, voltage and field current, voltage measurement. Two No’s DPM for AC regulator output voltage, current measurement. Three no. potentiometer used to vary armature, field, AC voltage. Over current, field failure protection. MCB for input ON/OFF. Shut down status indicator and reset switch for protection circuit.
SUGGESTED EXPERIMENTS
1.Determination of transfer function of armature controlled DC motor.

17. WARD - LEONARD SPEED CONTROL SYSTEM OF DC SHUNT MOTOR(PEC14HV2) [TOC]

This trainer is designed to drive the 1HP DC motor (optional) using ward Leonard system so that varies parameters of DC motor can be found experimentally. It consists of , (1). 1HP AC motor coupled with 1HP DC generator. (2). 1HP DC motor with mechanical loading arrangement.
3 Φ Input, all are mounted on a nice cabinet One no. of Experimental manual It consists of SCR based fully controlled converter for field voltage variation (0 - 200V DC variable, 1AMP) of DC generator. One no. SCR based AC regulator for motor / generator winding inductance measurement. (0- 100V AC, 1AMP variable) One no. diode bridge converter for DC motor filed voltage (200V fixed). One no. DPM for field voltage measurement. One no. potentiometer used to vary field DC voltage. One no. toggle switch to reverse the voltage. Over current, field failure protection. MCB for input ON/OFF.
SUGGESTED EXPERIMENTS
1. Determination of transfer function of armature controlled DC motor
Speed Vs Armature - voltage transfer function Speed Vs torque transfer function Armature current Vs voltage transfer function Current Vs torque trans function.

18. MICRO CONTROLLER BASED SLIP RING INDUCTION MOTOR SPEED CONTROL USING STATIC KRAMMER DRIVE (PEC16HV10B) [TOC]

This is designed for microcontroller controlled static slip power recovery drive in constant torque mode for steady state and transient state analysis including effects of core loss and saturation
This hardware will be suitable for speed control of Slip Ring Induction motor and monitoring many motor parameters for research purpose. The full system consists of a 3 phase slip ring induction motor coupled with a DC Generator for Electrical loading, a 3 phase converter to convert the rotor output to a DC link voltage , a R-L filter to smoothern & reduce the ripple in the DC output voltage of the converter. A 3 phase line commutated thyristorised inverter controlled by a Microcontroller based system. The microcontroller based system is meant to provide firing pulses to thyristors of the inverter & motor, all motor parameters etc.
VPC - 51 with Add-on cards (8051 based Microcontroller system) controls, measures & monitors all Analog & Digital inputs & Outputs. AD/DA card monitors all motor parameters like Current, Voltages etc. A Separate dual ported RAM is provided for fast transfer of all parameters (Motor current, Voltage, Speed etc.,) to the PC for displaying Graphically. The digitized datas are stored in the Dual ported RAM to be sent to IBM PC through RS232C port for displaying these on the CRT screen graphically and for further analysis.
Detailed Specifications:
Slip Ring Induction Motor : 3 H.P, 3 Phase 400V/440V, 50Hz, 2.2 KW, R.P.M 1440, Amp (4.5) with suitable rotor volts 210V or so and current 6 amp rating continuously coupled with appropriate DC (3 H.P, 2.2KW) machine for electrical loading purpose through a resistive/lamp load
Make : Benn Volts : 400/440V, 3 phase, 50 Hz 2.2 KW (3 hp), RPM : 1440 4.5 Amps Rotor Volts : 210 Volt Rotor Current : 6 Amps
DC Generator as Load : # Make : Kirloskar /Grampton Greaves # 5 hp, 1500 rpm # Resistive load of 4 KW provided Both Slip Ring Induction motor and DC Generator are coupled together. One optical encoder is provided for the speed measurement. The output of optical encoder is signal conditioned & calibrated to indicate the speed of the motor & display on a 3½ digit display. Converter - Inverter unit for slip power recovery scheme with inverter being Microcontroller controller (8051) thyristor [PIV = 1200V, Current 25 Amp.] having a filter (R-C) in between for filtering ripples of output DC of converter/uncontrolled rectifier. Converter : # 6 Diodes, 120 volt PIV, 25 Amp to form the bridge # Fuse provided. Inverter : # 6 Thyristors, 1200 Volt PIV @ 25 amp # The SCRs are mounted on suitable heat sinks and Snubber circuit is provided to each device. One 3φ Transformer provided to feedback the recovered power to the line. One Auto Transformer provided, controls manually the power feed back to the line. Power meters provided at various points to monitor to power consumed. A power control panel is provided to fix various Volt meters, Current meters, and Power meters. The panel consists of a) Auto Transformer b) ON/OFF Switch c) Volt meter d) Current meter e) Switches to select various options. f) One Volt meter, One Current meter to show the generator Voltage output and Current output. 3 Ammeters to show the 3 phase currents of Inverter output. One Ammeter and One Voltmeter to show the Current and Voltage output of the Converter. 3 Ammeter provided to show the 3φ Current outputs of Rotor. 3 Ammeter provided to show the 3φ Current outputs of Stator. 3 Ammeter and One Voltmeter provided to monitor the 3φ current input from the line. Hall-effect current transducer are provided to measure i. Stator Currents, ii. Rotor Currents iii. Converter Output Current iv. Inverter output currents Hall-effect voltage transducer are provided to measure voltages at various points of the experimental setup (Fig.4). Necessary test points provided for obtaining oscillo graphic waveform record of supply voltage, supply current, stator voltage, stator current, DC link voltage, DC link current, inverter feedback current and rotor current waveforms.
The above setup is able to measure the following parameters,
Steady state Behaviour of Drive Transient state Behaviour of Drive
The Software has provision to record the following in the computer and graphical hard copy can be taken.
No Load speed Vs. firing angle characteristics Torque - speed characteristics at different firing angle [95° to 160° in step 10 or by user setting] Torque (2P.U) Vs. DC link current (0 P.U to 3.75 P.U at firing angle 95° to 145°) Full load supply current Vs. slip characteristics at firing angle 95° to 145° [Here supply current is computed as phasor sum of stator current and inverter current on A.C side] Supply power factor Vs. slip (P.U) Characteristics at different firing angle System efficiency Vs. slip curves at different angle at full load # Determination of Transfer function.

19. DSP BASED STATIC KRAMMER DRIVE (PEC16HV10C) [TOC]

It consists of three major parts namely,
SCR 3 phase inverter DSP Based inverter firing circuit Slip ring induction motor setup with rotor converter circuit & RL For DC filtering
SCR 3 phase Inverter :
It consists of 6 Nos. of SCRs rated at 1200V, 50Amp with suitable heat sinks to form 3 phase fully controlled converter work as a 3phase inverter (α > 90 )
DSP Based inverter firing circuit :
TMS320F2407A DSP Based firing circuit. Six Isolated gate signals for Full Bridge Converter. Firing Angle variable from 180° to 0°through Ramp and pedestal control. Gated carrier source at 4 KHz. Housed in a Sleek cabinet. Test points are provided on the front panel for detailed study of circuit signals by the student. Necessary test points are terminated at sockets so that the student can monitor/ measure/study the signals using CRO, DVM, etc., One potentiometer to vary the firing angle. One ON/OFF switch with indicator provided to power the control circuitry so that the students can monitor all the test points of the control circuitry for correct functioning.
Slip ring motor with diode bridge rectifier :
3 phase 3 hp slip ring induction moto # Make : Benn # Volts : 400/440V, 3 phase, 50 Hz # 2.2 KW (3 hp), RPM : 1440 # 4.5 Amps # Rotor Volts : 210 Volt # Rotor Current : 6 Amps One no. of 3 phase bridge rectifier is provided to convert rotor circuit volt 13%, 210V to DC One no. of 'L' & 'R' provided for DC filtering Necessary test points provided for easy study Entire control circuit mounted inside a compact box Mimic circuit is drawn in the front panel Many test points are provided along with front panel A Nice text-lab manual is provided Power Supply : # Input:230V ± 10%, 3 phase AC # ±15V DC @ 0.5A regulated output for the control circuitry.

F. STANDALONE SCR TRAINERS [TOC]

1.UJT CHARACTERISTIC AND OSCILLATOR STUDY MODULE (PEC14M5)
2. DIGITAL MEASUREMENT OF PHASE ANGLE (PEC14M19)
3. AC SOLID STATE RELAY USING OPTO-COUPLER ISOLATION (TL-13).
4. SCR RING COUNTER (PEC14M11)
5. FAST RECOVERY DIODE CHARACTERISTICS STUDY MODULE (VPET - 304)
6. AC PHASE CONTROL USING SCR, TRIAC & DIAC (PEC14M22)
7. SCR DC CIRCUIT BREAKER (VPET - 100)
8. ZERO VOLTAGE SWITCHING USING SCR/TRIAC (PEC14M9)
9. OPTICAL TRIAC SYSTEM (VPET - 400)
10. AUTOMATIC LIGHTNING CONTROL USING SCR & OPTO ELECTRONIC COMPONENTS (VPET - 401)

1.UJT CHARACTERISTIC AND OSCILLATOR STUDY MODULE (PEC14M5) [TOC]

This module has been designed to study and demonstrate the building up a UJT Relaxation Oscillator and use this circuit to trigger a SCR. This circuit also provides a Time Delay. Most of the circuit points are terminated on SPRING, the individual components can be inserted externally by students, which makes a student a deep understanding in the UJT Relaxation circuit.
UJT Relaxation Oscillator is used to generate triggering pulses for SCR. By using UJT Relaxation Oscillator the SCR is working as a ON DELAY TIMER and AC Regulation.
Circuits to study UJT Relaxation Oscillator. Most of the circuit points are terminated on spring so that components can be inserted externally. Maximum components can be inserted through spring termination externally for students study . 3 Sockets are provided to insert externally a SCR.