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| TROUBLESHOOTING & REPAIR | ||||||||||||
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| CHOPPER MODULE FUNCTION TEST (continued) | |||||||||||
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| FIGURE F.17 – POWER MODULE CONNECTIONS |
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| B8 |
| B7 | HL W11 | ||
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| HL W6 |
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| B1 |
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| B4 |
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| B2 |
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| B5 |
| HL W5 | ||
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| B3 |
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| B6 |
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| HL W4 |
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| HL W9 |
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| HL W8 |
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| SL302 | SL301 |
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| SL13 |
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| TEST PROCEDURE | SL14 |
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| 9. | If the correct voltage is present at terminals | |||||||||||
1. | Perform the | Case Cover Removal | |||||||||||
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| Proced . |
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| B1- to B2+ and B4- to B5+ of the chopper | |||||
2. | Make sure that there is nothing plugged into |
| module, check for DC voltage at the chopper | ||||||||||
| module terminals B2+ to | ||||||||||||
3. | either of the Amphenol receptacles. |
| , If significant voltage is present, disconnect | ||||||||||
Place idle switch in the “HIGH” position. |
| leads #23 and #25 from the chopper module | |||||||||||
4. | Place the mode switch in the |
| PC board. If voltage is still present, the cop- | ||||||||||
| per module is shorted and should be | ||||||||||||
5. | position. |
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| 10. | replaced. |
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Place the Welding Terminal switch in the | If the voltage drops to 0 VDC after the #23 | ||||||||||||
6. | “REMOTELY CONTROLLED” position. |
| and #25 leads have been disconnected, the | ||||||||||
Start the engine and allow it to stabilize at |
| control PC board is driving the chopper mod- | |||||||||||
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| high idle RPM. |
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| ule when it should not be doing so. | |||||
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| Reconnect the #23 and #25 leads and per- | ||||||
| 7. Check for 80 to 100 VDC at terminals B1- to |
| form the | Weld Control Board Gate Drive | |||||||||
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| B2+ and B4- to B5+ of the chopper module. |
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8. | See wiring diagram and figure #1. | 11. |
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If the correct DC voltage is not present at ter- | Reconnect leads #23 and #25, and place the | ||||||||||||
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| minals B1- to B2+ and B4- to B5+, check for |
| Welding Terminal switch in the “WELD TER- | |||||||||
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| damaged conductors or faulty connections | 12. | MINALS ON” position. | |||||||||
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| between the chopper module, the output rec- | Check for about 58 VDC between Chopper | ||||||||||
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| tifier, and the stator weld winding. See Figure |
| Module Terminals B2+ to | |||||||||
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| F.17. See the wiring diagram. Perform the |
| and between the welder output terminals. | |||||||||
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| Stator Voltage Tests, and the Output |
| See Figure F.17. See the wiring diagram. | |||||||||
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| Rectifier Test. |
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