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TROUBLESHOOTING & REPAIR | |||||
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| Observe all Safety Guidelines detailed throughout this manual |
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PROBLEMS |
| POSSIBLE AREAS OF |
| RECOMMENDED | |
(SYMPTOMS) | MISADJUSTMENT(S) |
| COURSE OF ACTION | ||
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| OUTPUT PROBLEMS |
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Machine has maximum weld out- | 1. If remote control is being | 1. | Check output control switch | ||
put and no control. |
| used, put output control switch |
| (SW3) and associated wiring. | |
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| (SW3) in “OUTPUT CON- |
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| TROL AT | 2. | Check feedback leads #222 | |
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| and control weld output with |
| (negative output terminal) and | |
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| the output control (R1) at DC- |
| #215, #210(output shunt) for | |
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| 1000. If the problem is solved, |
| loose or faulty connections. | |
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| check the remote control unit |
| See wiring diagram. |
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| (or wire feeder) and associat- |
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| ed control cable. | 3. | Check the #75 lead for conti- | |
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| nuity (zero ohms) from the | |
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| output control potentiometer | |
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| (R1) to the control board plug | |
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| 10J1. See wiring diagram. | |
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| 4. Perform Firing Board Test. | ||
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| 5. Perform Control Board Test. | ||
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| 6. Perform SCR Output Bridge | ||
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| Test. |
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Machine has minimum output | 1. If a remote control unit is NOT | 1. | Check the output | control | |
and no control. |
| connected to the terminal strip |
| potentiometer (R1) and asso- | |
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| #73, #74,#75, #76, and/or #77 |
| ciated wiring. |
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| terminals, the output control |
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| switch must be in the “OUT- | 2. | Check the output | control |
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| PUT CONTROL AT |
| switch (SW3) the welding | |
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| position. |
| mode switch (SW4) and asso- | |
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| ciated wiring. |
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| 2. If a remote control cable is |
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| connected to terminals #73, | 3. | Perform the Control Board | |
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| #74, #75, #76, and/or #77, the |
| Test. |
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| leads may be shorted to the |
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| positive weld output. | 4. | Perform the Firing Board | |
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| Test. |
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| 3. Make certain the three phase |
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| input voltage is correct and | 5. | Perform the SCR Output | |
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| matches the machine rating |
| Bridge Test.. |
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| and the reconnect panel. |
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| 6. | Perform Main Transformer | |
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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 tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call
