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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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| WELDING PROBLEMS |
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The arc is unstable and or “hunting”. | 1. | Check for worn or melted con- | 1. Check for loose connections at | |||
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| tact tip. | the | output terminals, the | ||
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| chokes, the capacitor bank and | |||
| 2. | Check for loose or faulty con- | all heavy current carrying leads. | |||
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| nections on the work and elec- | See Wiring Diagram. | |||
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| trode cables. | 2. Make sure that the transformer | |||
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| 3. | Make sure electrode polarity or | secondary | leads | are securely | |
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| welding process being used, is | connected to the SCR rectifier | |||
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| correct. | assembly. |
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| 4. | Check for rusty or dirty wire. | 3. The output capacitor bank may | |||
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| be faulty. Check for loose con- | |||
| 5. | Make sure machine settings and | nections at the capacitors. Also | |||
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| gas are correct for process | check | for | leaky | capacitors. |
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| being used. | 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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| 4. Perform the SCR Rectifier | |||
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| Assembly Tests. |
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| 5. The control board may be faulty. | |||
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| Replace. |
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Weld bead is narrow or ropy. May | 1. | Make sure the weld procedure | 1. The output capacitor bank may | |||
have porosity with electrode stub- |
| and electrode polarity is correct | be faulty. Check for loose con- | |||
bing into plate. |
| for the process being used. | nections at the capacitors. Also | |||
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| check | for | leaky | capacitors. |
| 2. | Make sure shielding gas is cor- | Replace if necessary. | |||
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| rect and flow is proper. | WARNING: The liquid elec- | |||
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| 3. | Make sure the weld joint is not | trolyte in these capacitors is | |||
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| “contaminated”. | toxic. Avoid contact with any | |||
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| portion of your body. | |||
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| 2. 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
