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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 |
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| (SYMPTOMS) |
| MISADJUSTMENT(S) |
| COURSE OF ACTION |
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| OUTPUT PROBLEMS |
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The machine does not have weld- |
| 1. Make sure the reconnect switch | 1. | Check the reconnect switch and |
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ing output. |
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| associated leads for loose or |
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| input voltage applied. |
| faulty connections. See the |
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| wiring diagram. |
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| 2. Primary current limit has been |
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| exceeded. Possible short in | 2. | Perform the DC Bus Board |
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| output circuit. Turn machine |
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| off. Remove all loads from the | 3. | Perform the Main Switch |
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| output of the machine. Turn |
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| Board Test. |
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| back on. If condition persists, |
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| turn power off, and contact an | 4. | Perform the | Power Board |
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| authorized Lincoln Electric Field |
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| Test. |
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| Service Facility. |
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| 3. This problem will normally be | 5. | Perform the Output Diode |
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| Module Test. |
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| accompanied by an error code. |
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| Error codes are displayed as a | 6. | The control board may be faulty. |
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| series of red and green flashes | 7. | The input filter capacitors may |
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| by the status LED. |
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| be faulty. Check and replace if |
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| 4. If an error code is displayed |
| necessary. |
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| see Fault Code Explanations. |
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| If thermal light is on, wait for |
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| machine to cool. |
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The POWER WAVE 355M/405M |
| 1. The input voltage may be too | 1. | Perform the Output Rectifier |
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will not produce full output. |
| low, limiting the output capabili- |
| Test. |
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| ty of the machine. Make cer- |
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| tain the input voltage is correct | 2. | Perform the Main Switch |
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| for the machine and the recon- |
| Board Test. |
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| nect switch and jumper lead |
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| configuration are correct. | 3. | Perform the | Power Board |
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| 2. The output current or voltage |
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| may not be calibrated correctly. | 4. | Perform the Current |
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| Check the values displayed on |
| Transducer Test. |
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| the Power Feed 10/11 versus |
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| readings on an external voltage | 5. | The control board may be |
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| and ammeter. |
| faulty. |
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| 3. The welding current may be too |
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| high . The machine will fold |
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| back to 100 amps if the weld- |
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| ing current exceeds 450 amps. |
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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
