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TROUBLESHOOTING & REPAIR |
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Observe Safety Guidelines |
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| TROUBLESHOOTING GUIDE | ||||
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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Poor arc characteristics. | 1. Make sure the correct weld pro- | 1. | Perform | the | SCR/Diode | |||||
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| cedures | are | being | used. |
| Rectifier Bridge Test. |
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| (Electrode, Polarity, etc.) | 2. Perform the Main Transformer | |||||||
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| 2. Check the welding cables for |
| Test. |
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| loose or faulty connections. | 3. The control board | may be | ||||||
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| faulty. Replace. |
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The welding arc is variable and | 1. | Check the input voltage at the | 1. | Perform | the | SCR/Diode | ||||
sluggish. |
| R3R, making sure the correct |
| Rectifier Bridge Test. | ||||||
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| voltage and all three phases are | 2. | Perform | the | Main | Trans- | |||
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| being applied to the machine. | ||||||||
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| former Test. |
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| 2. | Make | sure | the | welding | 3. | The control board | may be | ||
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| process | is correct | for the | ||||||
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| faulty. Replace. |
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| machine settings. |
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| 3. Check the welding cables for |
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| loose or faulty | connections. |
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| Also make sure the cables are |
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| sized correctly for the welding |
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| current. |
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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
