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TROUBLESHOOTING AND REPAIR |
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Observe Safety Guidelines detailed in the beginning of this manual. |
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| PROBLEMS |
| POSSIBLE AREAS OF |
| RECOMMENDED |
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| (SYMPTOMS) |
| MISADJUSTMENT(S) |
| COURSE OF ACTION | |||
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| OUTPUT PROBLEMS |
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Poor arc starting when the DC600 is | 1. | Make sure the proper welding | 1. | Check the connections from the | ||||
in the CV |
| procedures are being used. |
| shunt to the Control Board | ||||
Modes. |
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| (wire feed speed, arc voltage |
| (leads 210 and 215). When weld | |||
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| and wire size) |
| current is present there should | |||
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| 2. Check weld cables for loose or |
| be a millivolt signal at the board | ||||
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| (6.25mv/100 amps). |
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| faulty connections. |
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| 2. Perform the Firing Board Test. | ||||
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| 3. | Perform | the | SCR | Output |
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| Bridge Test. |
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| 4. The Control | Board | may be | ||
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| faulty. |
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Poor arc characteristics in all | 1. | Check for the correct input volt- | 1. | Check the Mode Switch (SW4) | ||||
processes. |
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| ages on the three phase input |
| and the associated wiring for | |||
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| lines at the DC600. |
| loose or faulty connections. See | |||
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| the Wiring Diagram. |
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| 2. Make sure the proper welding |
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| procedures are being used (wire | 2. | Check the voltage at the shunt | |||
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| feed speed, arc voltage and wire |
| (leads 210 and 215). When weld | |||
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| size). |
| current is present there should | |||
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| be a millivolt signal at the board | |||
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| 3. | Check the welding cables for |
| (6.25mv/100 amps). If not cor- | |||
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| loose or faulty connections. |
| rect, the shunt may be defective | |||
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| 3. Perform the Firing Board Test. | ||||
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| 4. | Perform | the | SCR | Output |
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| Bridge test. |
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| 5. The Control | Board | may be | ||
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| faulty. |
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call
