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TROUBLESHOOTING & REPAIR | |||||
TROUBLESHOOTING GUIDE |
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| Observe Safety Guidelines | ||
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| detailed in the beginning of this manual. | |||
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PROBLEMS |
| POSSIBLE AREAS OF | RECOMMENDED | ||
(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 |
| nections at the output terminals, | ||
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. | ||
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 test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call