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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 |
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| POSSIBLE AREAS OF | RECOMMENDED |
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(SYMPTOMS) |
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| MISADJUSTMENT(S) | COURSE OF ACTION |
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| WELDING PROBLEMS |
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The welding arc | is “cold.” | The |
| 1. Check for loose or faulty connec- | 1. | Check for the correct OCV at the | |||||
engine runs normally. The auxiliary |
| tions at the weld output terminals |
| welding output terminals. | If the | ||||||
power is normal. |
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| and welding cable connections. |
| correct voltage is present at the | |||||
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| 2. Make sure the work clamp has a |
| output terminals, check for loose | |||||
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| connection on the heavy current | ||||||
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| clean connection to the work |
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| carrying | leads | inside | the | |||
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| piece. |
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| Commander | 300. |
| See the | |||
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| 3. The welding cables may be too |
| Wiring Diagram. |
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| long or coiled, causing an | 2. | If the OCV is low at the welder | |||||
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| excessive voltage drop. | |||||||
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| output terminals, | perform the | |||||
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| 4. Make sure the electrode (wire, |
| Engine | Throttle | Adjustment | |||
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| gas, voltage, current, etc.) is |
| Test. |
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| correct for the process being | 3. | Perform | the | Output | Rectifier | ||
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| used. | |||||||
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| Bridge Test. |
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| 5. Make sure the machine settings | 4. | Perform | the | Stator | Voltage | ||
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| match the weld application. | |||||||
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| Test. |
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| 5. | Perform | the | Power | Module | ||
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| Test. |
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| 6. | Perform the Control Input Test. | |||||
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| 7. | Perform | the | Feedback | Input | ||
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| Test. |
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| 8. | Perform the PWM Output Test. | |||||
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| 9. | If so equipped, perform the | |||||
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| Display | Board | Calibration | |||
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| Test. |
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The welding arc | is “hot”. | The |
| 1. Make sure the electrode (wire, | 1. | Perform | the | Power | Module | ||
engine runs normally. The auxiliary |
| gas, voltage, current, ect.) is |
| Test. |
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power is normal. |
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| correct for the process being | 2. | Perform the Control Input Test. | |||||
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| 2. Make sure the machine settings | 3. | Perform | the | Feedback | Input | ||
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| Test. |
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| match the weld application. |
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| 4. | Perform the PWM Output Test. | |||||
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| 5. | If so equipped, perform the | |||||
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| Display | Board | Calibration | |||
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| Test. |
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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
