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TROUBLESHOOTING AND REPAIR |
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Observe Safety Guidelines 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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| WELDING PROBLEMS |
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The welding arc is “cold.” Engine | 1. | Check for loose or faulty connec- | 1. Check for the correct open cir- | ||||||
runs normally (3700 RPM no load). |
| tions at the weld output terminals | cuit voltage (OCV) at the welder | ||||||
Auxiliary power is functioning nor- |
| and welding cable connections. | output | terminals | See | the | |||
mally. |
| 2. | The welding cable may be too | Machine Diagram. If | the | cor- | |||
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| rect voltage is present at | the | ||||||
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| long or coiled, causing an exces- | ||||||
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| output terminals, then check for | ||||||
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| sive voltage drop. | ||||||
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| loose connections on the heavy | ||||||
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| current carrying leads inside the | |||||
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| RANGER® 8. | See | Wiring | |||
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| Diagram. |
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| 2. If the OCV is low at the welder | |||||
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| output terminals, | perform | The | |||
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| Engine | Throttle | Adjustment | |||
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| Test. |
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| 3. Perform the Output Rectifier | |||||
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| Bridge Test. |
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| 4. Check for shorted or grounded | |||||
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| windings in the reactor and also | |||||
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| in the main stator. See Wiring | |||||
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| Diagram. |
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Welding output is low with little | 1. | Check the brushes for wear and | 1. Make up a jumper to connect | ||||||
or no control. Auxiliary output is |
| proper contact to the rotor slip | the Field Test Point (FTP1) on | ||||||
also low. |
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| rings. | the PC Board to lead 219. | The | ||||
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| connection can be made at the | |||||
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| board (J1,Pin5), or at the | |||||
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| Negative Exciter | Brush. See | ||||
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| Figure F.4 and/or the Wiring | |||||
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| Diagram. If the output comes | |||||
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| up to full strength, the Control | |||||
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| Board | is probably | defective. | |||
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| Replace. |
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| 2. Perform the Rotor Voltage | |||||
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| Test. |
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| 3. If Rotor Voltage Test is normal, | |||||
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| then | preform | the | Rotor | ||
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| Resistance Test. |
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| 4. If the Rotor Voltage Test is NOT | |||||
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| normal, | perform | the | Auxiliary | ||
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| and Field Winding | Voltage | ||||
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| Test. The Printed Circuit Board | |||||
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| may be faulty. Replace |
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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
