Description
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SCR Characteristics Trainer
Specification
• Basic static characteristics study trainer.
• LM723 based variable DC power supply (0-30V) for SCR Vak.
• LM723 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 nos. fixed load resistor for all devices.
• Four nos. potentiometer to vary all voltages.
• LED indication for all power supply.
• Three nos. digital multimeter for measurement of device parameters.
• For Diac external power supply to the provided.
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Three Phase Cyclo Converter
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.
Specification
• Eightin nos. SCR with RC snubber protection is provided for 3phase • cycloconverter power circuit (each phase consist of 6 SCRs) Rated at 1200V@25Amps. • Three nos. center tapped inductor (0%.50%, 100%) is provided for power circuit. • Eightin 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 (3phase) for the firing circuits. • 24-0-24V 3phase input for power circuit.
Single Phase Bridge Firing Circuit
Specification
• Line synchronized IC based linear firing circuit for SCR applications. • Line synchronization achieved by 230 / 9V step down transformer. • Four nos. 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, 5Hz AC input, fuse provided for over load protection. • One no. ON/OFF switch with LED indication for power ON/OFF. • Provision to control the firing angle through external 0 to 5V DC.
Single Phase Cyclo Converter
Specification
• Consists of firing circuit, SCR power circuit and load. • Line synchronized IC based linear firing circuit. • Line synchronization achieved by step - down transformer. • Four nos. firing pulse with pulse transformer isolation to trigger four SCR. • One no. potentiometer used to vary the firing angle (180° - 0°). • Carrier logic implemented with carrier frequency of 4KHz. • One no. toggle switch with debounceogic for pulse ON/OFF. • EPROM Based firing pulse frequency variation. • Two nos. toggle switch to select different frequency (Hz, 50/2Hz, 50/3Hz, 50/4Hz). • Power circuit consists of Four nos. 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 Center tapped inductor for power circuit. • 230V, 50Hz AC input with ON/OFF rocker switch, fuse for over load.
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