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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 |
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| (SYMPTOMS) |
| MISADJUSTMENT(S) |
| COURSE OF ACTION |
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| OUTPUT PROBLEMS |
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Input contactor pulls in when | 1. | Make sure input line voltage | 1. I f c o n t a c t o r ( C R 1 ) | f u n c t i o n s | |||||
ON/OFF Switch is closed but imme- |
| matches machine rating and the | c o r r e c t l y w i t h t h e c a bl e s | ||||||
diately drops out. |
| reconnect panel is connected | removed there may be a fault in | ||||||
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| correctly for the line voltage. | the control cables or the wire | |||||
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| feeder. See Protective Devices | |||
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| Remove all weld cables and | and Shutdown Circuits. |
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| external wires attached to termi- | 2. Check inter nal remote control | |||||
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| nal strip and the 14pin MS con- | ||||||
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| c i r c u i t ( l e a d s 7 5 , 7 6 a n d 7 7 ) | ||||||
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| nector | and make sure | the | ||||
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| including the Output Terminals | ||||||
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| Output | Terminals Switch | is in | ||||
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| S w i t c h ( S 3 ) a n d t h e O u t p u t | ||||||
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| the REMOTE position. |
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| C o n t r o l ( R 1 ) fo r gr o u n d s o r | |||||
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| 2. If the problem persists after per- | s h o r t s. S e e t h e | Wiring | |||||
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| Diagram. |
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| forming step 1 the problem is in |
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| the DC600. |
| 4. The Control Board may be | ||||
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| faulty. See the PC Board | |||
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| Troubleshooting Guide. |
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Machine shuts off (input contactor | 1. | Remove all welding cables and | 1. Check for grounds and or shorts | ||||||
drops out) when the welder output |
| control cables from the DC 600. | in the #75, #76, #77 circuit. See | ||||||
terminals | are made electrically |
| If the machine does NOT shut | the Wiring Diagram. |
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"hot". |
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| off and normal open circuit volt- |
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(Output Terminals Switch ON). |
| age is present at the welder out- | 2. Check for grounds and shorts in | ||||||
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| put terminals the problem is | the welder output terminals and | |||||
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| external to the DC600. Either | associated | leads. | See | the | ||
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| the remote leads #75, #76 or | Wiring Diagram. |
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| #77 are grounded to the nega- |
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| tive output circuit or there is a | 3. Check the | output | shunt | and | ||
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| short on the welding output ter- | associated | leads. | See | the | ||
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| minals. |
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| Wiring Diagram. |
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| 2. | If the machine still shuts off | 4. Perform the Control Board | |||||
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| when all control and welding | Test. |
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| cables are removed then the |
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| problem is internal to the |
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| DC600. |
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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