SECTION 6 PCM-875A Plasmarc System Troubleshooting
6-9
6.3 Reference Voltage Checks
A. Control Board Assembly (PCB1)
LED’s
LED-1 - Torch Switch
LED-2 - High Frequency
LED-3 - Gas Solenoid Valve
Voltage Test Points
Tests are made with power on - no arc.
Disable High Frequency by disconnecting blue wire
with black sleeve
TP-0 - Ground
TP-1 - +15 vdc
TP-2 - +12 vdc
TP-3 - -12 vdc
TP-4 - +5 vdc
TP-9 - IGBT’s driving signal - switching
frequency = 16 KHz
TP-10 - IGBT’s driving signal - switching
frequency = 16 KHz
13 vdc
-13 vdc
5 msec
62 µsec
0
IGBT Gating Signal
For 208/230 VAC input, the IGBT off time is 3msec.
For 400/460/575 VAC input, the IGBT off time is 6msec.
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