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TROUBLESHOOTING & REPAIR |
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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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| FUNCTION PROBLEMS |
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The fan motor does not run when | 1. Normal operation. | The Multi- | 1. Carefully check for approxi- | |
the machine is turned on. | Weld 350 utilizes a Fan On | mately 40VDC at the fan motor | ||
| Demand system. | The fan | leads (303+ to | |
| should activate when welding. | must be performed while the | ||
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| machine is connected to a resis- | |
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| tive load or welding. If the | |
The fan does not run when welding. | 1. The fan should turn on when the | 40VDC is NOT present, check | ||
| arc starts and remain on for | the associated leads and plugs | ||
| about a minute after the arc is | for loose or faulty connections. | ||
| out. |
| See the Wiring Diagram. If the | |
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| correct voltage IS present and | |
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| the fan is not running, the fan | |
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| motor may be faulty. | |
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| 2. If the correct voltage (40VDC) is | |
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| not present in the above test, | |
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| perform the DC Buss Supply | |
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| Board Test. | |
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| 3. The Weld Control Board may be | |
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| faulty. 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, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
