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TROUBLESHOOTING & REPAIR | |||||||||
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| TROUBLESHOOTING GUIDE - Observe all Safety Guidelines detailed throughout this manual | ||||||||
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| PROBLEMS |
| POSSIBLE AREAS OF | RECOMMENDED | |||||
| (SYMPTOMS) |
| MISADJUSTMENTS(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. |
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| the output terminals, the choke, | |||
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| the capacitor bank and all heavy | ||
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| 2. | Check for loose or faulty con- | current carrying leads. | |||||
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| nections on the work and elec- |
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| trode cables. |
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| 2. Make sure that the transformer | |||
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| secondary | leads are securely | |
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| 3. | Make sure electrode polarity is | connected to the SCR Rectifier | |||||
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| correct | or | welding | process | Assembly. |
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| being used. |
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| 3. The output capacitor bank may | ||
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| 4. | Check for rusty or dirty wire. | be faulty. Check for loose con- | |||||
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| nections at the capacitors. Also | ||
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| 5. | Make | sure | machine | settings | check for | leaky capacitors. | |
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| and gas are correct for process | Replace if necessary. | |||||
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| being used. |
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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. 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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| trolyte in these capacitors is | ||
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| 3. | Make sure the weld joint is not | toxic. Avoid contact with any | |||||
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| "contaminated". |
| portion of your body. | ||||
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| 2. The control board may be faulty. | ||
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| Replace. |
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The contact tip seizes in the gas dif- | 1. | The tip being over heated due to |
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fuser. |
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| excessive current and/or high |
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| duty cycle welding. |
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2.A light application of high tem- perature antisieze lubricant (such as Lincoln E2607 Graphite Grease) may be applied to the contact tip threads.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, con- tact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call 216-
