Reference Voltage Checks - ESAB POWERCUT-1250 Instruction Manual

SECTION 5

5.3 REFERENCE VOLTAGE CHECKS

A. Control Board Assembly (PCB1)
1. LED's
LED- (D9)- Torch Switch
LED- (D4)- Pilot Arc Relay
LED- (D1)- Gas Solenoid Valve
2. Voltage Test Points
Tests are made with power on - no arc.
Disable High Frequency by disconnecting blue wire with black
sleeve
TP-1 - Torch trigger signal
TP-4 - IGBT's driving signal - switching frequency = 18.5 KHz
TP-5 - IGBT's driving signal - switching frequency = 18.5 KHz
TP-7 - +5 vdc
TP-8 - +15 vdc
TP-9 - -15 vdc
TP-10 - Ground
13vdc
0
Figure 5.1 IGBT Gating Signal
36
TROUBLESHOOTING
54 µs
13vdc