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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 |
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| POSSIBLE AREAS OF |
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(SYMPTOMS) |
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| MISADJUSTMENT(S) |
| COURSE OF ACTION | |||||
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| OUTPUT PROBLEMS |
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Machine has maximum weld output | 1. | If remote control is being used | 1. | Check | the | LOCAL/REMOTE | ||||
and no control. |
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| set LOCALl/REMOTE SWITCH |
| Switch (SW3) | and | associated | |||
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| (SW3) to ‘LOCAL’ position and |
| wiring. |
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| try to control weld output using |
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| the Output Control | 2. | Check | feedback leads #222 | ||||
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| Potentiometer (R1) at the |
| (negative | output | terminal), | |||
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| DC600. If the problem is solved |
| #215, and | #210 (output shunt) | ||||
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| check the remote control unit |
| for loose or faulty connections. | |||||
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| (or wire feeder) and associated |
| See Wiring Diagram. |
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| control cable. |
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| 3. Check the #75 lead for continu- | ||||||
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| ity (zero ohms) from the Output | |||||
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| Control | Potentiometer | (R1) to | |||
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| the control board | connector | ||||
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| J1,Pin2. See Wiring Diagram. | |||||
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| 4. | Possible | defective |
| Control | ||
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| Board or Firing Board. See the | |||||
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| PC Board | Troubleshooting | ||||
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| Guide. |
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| 5. | Perform | the | SCR | Output | ||
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| Bridge Test. |
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Machine has minimum output and | 1. | If a remote control unit is NOT | 1. | Check | the | Output | Control | |||
no control. |
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| connected to the |
| Potentiometer (R1) and associ- | |||||
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| LOCAL/REMOTE Switch must |
| ated wiring. |
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| be in the "LOCAL" position. |
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| 2. | Check | the | LOCAL/REMOTE | |||
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| 2. If a remote control cable is con- |
| Switch (SW3), the Weld Mode | ||||||
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| nected, the control leads may |
| Switch (SW4) | and | associated | |||
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| be "shorted" to the positive weld |
| wiring. |
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| output. |
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| 3. | Perform | the | Control | Board | ||
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| 3. | Make certain the three phase |
| Test. |
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| input voltage is correct and |
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| matches the machine rating and | 4. | Perform the Firing Board Test. | |||||
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| the reconnect panel. |
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| 5. | Perform | the | SCR | Output | ||
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| Bridge Test. |
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| 6. Perform the 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
