ESAB POWERCUT-1250 Troubleshooting Guide download pdf (Page 12)

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Figure 5.1 IGBT Gating Signal

5.2 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

54 µs

13vdc

SECTION 5 TROUBLESHOOTING

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 21 22

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ESAB POWERCUT-1250 Troubleshooting Guide Page 12