Reference Voltage Checks - ESAB ESP-50 Instruction Manual

SECTIoN 6
5.3
A. Control Board Assembly (PCB1)

REFERENCE VOLTAGE CHECKS

6.3 rEfErENCE VolTagE CHECKS
1. LED's
a. Control Board assembly (PCB1)
LED-1 - Torch Switch
1. lED's
LED-3 - Gas Solenoid Valve
lED-1 - Torch Switch
2. Voltage Test Points
lED-3 - gas Solenoid Valve
Tests are made with power on - no arc.
2. Voltage Test Points
Tests are made with power on - no arc.
TP-0 - Ground
TP-1 - +15 vdc
TP-2 - +12 vdc
TP-0 -
TP-3 - -12 vdc
TP-1 -
TP-4 - +5 vdc
TP- -
TP-9 - IGBT's driving signal - switching frequency = 20 KHz
TP- -
TP-10 - IGBT's driving signal - switching frequency = 20 KHz
TP-4 -
TP-9 -
TP-10 -
13 vdc
0
6 usec - LPG50
9 usec - LPG80
For 208/230 VAC input, the IGBT off time is 3µsec.
For 08/0 VAC input, the IGBT off time is µsec.
For 400/460 VAC input, the IGBT off time is 3µsec.
For 400/460 VAC input, the IGBT off time is µsec.
Figure 5.1 IGBT Gating Signal
figure 6.1 IgBT gating Signal
33
TROUBLESHOOTING
Ground
+15 vdc
+1 vdc
-1 vdc
+5 vdc
IGBT's driving signal - switching frequency = 0 KHz
IGBT's driving signal - switching frequency = 0 KHz
50 µsec
40 usec - LPG50
50 usec - LPG80
9
TrouBlESHooTINg
-13 vdc