ESAB Powercut 875 Manual De Instrucciones página 212

sectIon 5
5.7 reference VoltaGe checks
a. control Board assembly (pcB1)
1. led's
LED-1 - Torch Switch
LED-2 - High Frequency
LED-3 - 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-0 -
TP-1 -
TP-2 -
TP-3 -
TP-4 -
TP-9 -
TP-10 -
Ground
+15 vdc
+12 vdc
-12 vdc
+5 vdc
IGBT's driving signal - switching frequency = 16 KHz
IGBT's driving signal - switching frequency = 16 KHz
For 208/230 VAC input, the IGBT off time is 3msec.
For /460/ VAC input, the IGBT off time is 6msec.
figure 5-3. IGBt Gating signal
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