| TROUBLESHOOTING | ||
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| Observe all Safety Guidelines detailed throughout this manual | ||
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| PROBLEMS | POSSIBLE CAUSE | RECOMMENDED |
| (SYMPTOMS) | COURSE OF ACTION | |
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| FUNCTION PROBLEMS |
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Welder runs but fails to generate | Generator or exciter brushes may | Be sure that all brushes bear on the | |
current. | be loose or missing. | commutator and have proper spring | |
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| tension. |
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| Exciter may not be operating. | Check exciter output voltage with |
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| voltmeter or lamp. |
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| Field circuit of generator or exciter | Check for open circuits in rheostat, |
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| may be open. | field leads and field coils. Also check |
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| resistors. |
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| Polarity reversing switch may be in | Put handle in positive or negative |
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| the neutral position. | position. |
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| Exciter may have lost excitation. | Check components and continuity in |
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| flashing circuit. |
Welding arc is loud and spatters | Series field circuit may be open cir- | Check circuit with ringer or volt- |
excessively. | cuited. | meter. |
| Current setting may be too high. | Check setting and current output |
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| with ammeter. |
| Polarity may be wrong. | Check polarity. Try reversing polarity |
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| or try an electrode of the opposite |
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| polarity. |
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
SAE400 & SAE400 WELD’N AIR