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TROUBLESHOOTING AND REPAIR | ||
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Observe all Safety Guidelines detailed throughout this manual.
PROBLEMS |
| POSSIBLE AREAS OF | RECOMMENDED |
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(SYMPTOMS) |
| MISADJUSTMENT(S) | COURSE OF ACTION | |||||
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| OUTPUT PROBLEMS (Continued) |
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No open circuit voltage output but | 1. Check the input voltage at the | 1. | Check for loose or broken con- | |||||
wire feeds normally when gun trig- | machine. Input voltage must |
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ger is pulled. |
| match the rating plate and the |
| the chokes, the capacitor bank | ||||
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| reconnect panel. |
| and all heavy current carrying | ||||
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| leads. See Wiring Diagram. | ||||
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| 2. The gun may be faulty. Check |
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| or replace. | 2. | Make sure that the transformer | ||||
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| secondary | leads | are | securely | |
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| connected to the SCR rectifier | ||||
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| assembly. |
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| 3. | Perform | the | SCR | Rectifier | |
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| Assembly Tests. |
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| 4. | Perform | Main | Transformer | ||
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| Test. |
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| 5. | The control board may be faulty. | ||||
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| Replace. |
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Wire feeds but welding output is low | 1. Make sure that the proper wire | 1. | Check for loose or faulty con- | |||||
causing wire to “stub”. | Welds are | and procedures are being used. |
| nections of the heavy current | ||||
“cold”. Machine cannot | obtain full |
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| carrying leads. |
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rated output of 200 amps at 28 volts. | 2. Check gun and work cable for |
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| loose or faulty connections. | 2. | The output capacitor bank may | ||||
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| be faulty. Check for loose con- | ||||
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| nections at the capacitors. Also | ||||
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| check for leaky capacitors. | ||||
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| Replace if necessary. |
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| WARNING: The liquid elec- | ||||
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| trolyte in these capacitors is | ||||
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| toxic. Avoid contact with any | ||||
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| portion of your body. | ||||
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| 3. | Perform | the | SCR | Rectifier | |
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| Assembly Tests. |
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| 4. | Perform the Main Transformer | ||||
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| Test. |
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| 5. | The control board may be faulty. | ||||
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| Replace. |
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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
