ESAB ESP-50 Instrukcja Naprawy Pobierz pdf (Strona 7)

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6.3 REFERENCE VOLTAGE CHECKS

A. Control Board Assembly (PCB1)

1. LED’s

LED-1 - Torch Switch

LED-3 - Gas Solenoid Valve

2. Voltage Test Points

Tests are made with power on - no arc.

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 = 20 KHz

TP-10 - IGBT’s driving signal - switching frequency = 20 KHz

For 208/230 VAC input, the IGBT o time is 3µsec.

For 400/460 VAC input, the IGBT o time is 3µsec.

Figure 6.1 IGBT Gating Signal

SECTION 6 TROUBLESHOOTING

SECTION 5 TROUBLESHOOTING

5.3 REFERENCE VOLTAGE CHECKS

A. Control Board Assembly (PCB1)

1. LED’s

LED-1 - Torch Switch

LED-3 - Gas Solenoid Valve

2. Voltage Test Points

Tests are made with power on - no arc.

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 = 20 KHz

TP-10 - IGBT’s driving signal - switching frequency = 20 KHz

For 208/230 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

50µsec

-13 vdc

13 vdc

40 usec - LPG50

50 usec - LPG80

6 usec - LPG50

9 usec - LPG80

1 2 3 4 5 6 7 8 9 10 11 12 ... 23 24

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