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TROUBLESHOOTING & REPAIR |
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TROUBLESHOOTING GUIDE |
| Observe Safety Guidelines | ||||
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| 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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| 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 | |||
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| 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- | |||
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| 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. |
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| 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 test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
