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| TROUBLESHOOTING AND REPAIR | |||||||
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Troubleshooting Guide – See Wiring Diagrams for location of specified | Observe Safety Guidelines | |||||||
components. See Wiring Diagrams for troubleshooting of specific circuits. | 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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| FEEDING PROBLEMS (Continued) |
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The wire feeds for a short period of | 1. The drive motor may be |
| 1. Check the motor | ar mature | ||||
time but then stops feeding. When | overloaded. | Check the wire |
| current through either of the | ||||
the gun trigger is released and | feeding path for mechanical |
| armature leads (539 or 541). A | |||||
then retriggered, the wire resumes | restrictions. |
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| typical value is 4 amps DC. | ||||
feeding but soon stops again. | 2. While welding make certain the |
| 2. If 5 amps or less is indicated | |||||
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| power source arc voltage is |
| and the armature voltage is | |||
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| staying above 15 VDC. The |
| being disabled by the control | |||
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| feeder will not function properly |
| board, then the control board | |||
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| on less than 15 VDC. |
| may be faulty. Replace. | |||
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| 3. If more than 5 | amps is |
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| indicated, then the motor is | |
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| drawing too much armature | |
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| current. Check and or replace | |
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| the motor brushes. |
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| 4. The motor or gearbox may be | |
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| faulty. Replace. |
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The wire stops or stubs while | 1. If the |
| 1. Monitor the motor armature | |||||
welding. |
| a constant | current power |
| voltage (leads 539 to 541). | |||
NOTE:On codes above 10100, the | source, the arc voltage may be |
| Normal range is 2 to 23 VDC. | |||||
“dipping” below the 15 VDC |
| If the armature voltage is | ||||||
| motor leads (541 & 539) are | threshold that is essential for |
| proper, then check or replace | ||||
| in Control Board Connector | proper |
| the motor brushes. |
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| J4, pins 13 & 14. |
| 2. Try connecting the |
| 2. If the motor armature voltage is | |||
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| a constant | voltage power |
| not correct, then the control | ||
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| source or a flatter slope output. |
| board may be faulty. Replace. | |||
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| 3. Make sure the wire feed mode |
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| switch (S3) is in the correct |
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| position for the power source |
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| being used, and proper speed |
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| setting is used for the |
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| procedure. |
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| 4. Check | for | mechanical |
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| restrictions in the wire feed |
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| path. |
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call
