ESAB ESP-50 Manuel D'instruction page 233

sectIon 6
SECTION 5
5.3 REFERENCE VOLTAGE CHECKS
6.3 reFerence VoltaGe checKs
A. Control Board Assembly (PCB1)
a. control board assembly (pcb1)
1. LED's
led's
1.
LED-1 - Torch Switch
led-1 -
LED-3 - Gas Solenoid Valve
led-3 -
2. Voltage Test Points
2. Voltage test points
Tests are made with power on - no arc.
Tests are made with power on - no arc.
TP-0 -
TP-0 -
TP-1 -
TP-1 -
TP-2 -
TP-2 -
TP-3 -
TP-3 -
TP-4 -
TP-4 -
TP-9 -
TP-9 -
TP-10 -
TP-10 - IGBT's driving signal - switching frequency = 20 KHz
13 vdc
0
For 208/230 VAC input, the IGBT off time is 3µsec.
For 208/230 VAC input, the IGBT off time is 3µsec.
For 400/460 VAC input, the IGBT off time is 3µsec.
For 400/460 VAC input, the IGBT off time is 3µsec.
Figure 5.1 IGBT Gating Signal
233
33
troubleshootInG
TROUBLESHOOTING
torch switch
Gas solenoid Valve
Ground
Ground
+15 vdc
+15 vdc
+12 vdc
+12 vdc
-12 vdc
-12 vdc
+5 vdc
+5 vdc
IGBT's driving signal - switching frequency = 20 KHz
IGBT's driving signal - switching frequency = 20 KHz
IGBT's driving signal - switching frequency = 20 KHz
50 µsec
40 usec - LPG50
50 usec - LPG80
6 usec - LPG50
9 usec - LPG80
Figure 6.1 IGbt Gating signal
-13 vdc