TROUBLESHOOTING | ||
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| Observe all Safety Guidelines detailed throughout this manual |
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PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Input contactor (CR1) chatters. | 1. | Faulty input contactor (CR1). |
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| Repair or Replace. |
| 2. | Low line voltage. |
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| Check input power. |
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Machine input contactor does not | 1. | Supply line fuse blown. Replace if |
operate. |
| blown - look for reason first. |
| 2. | Contactor power circuit dead. |
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| Check control transformer T2 and |
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| associated leads. |
| 3. | Broken power lead. Check input |
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| voltage at contactor. |
| 4. | Wrong input voltage. Check volt- |
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| age against instructions. |
| 5. | Open input contactor coil. |
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| Replace coil. |
| 6. | POWER “I/0” switch (S1) not |
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| closing. Replace switch. |
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Machine input contactor operates, | 1. | Trigger circuit between #2 and #4 |
but no output when trying to weld. |
| leads is not being closed. Make |
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| sure trigger circuit is being |
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| closed. |
| 2. | Electrode or work lead loose or |
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| broken. Repair Connection. |
| 3. | Open main transformer (T1) pri- |
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| mary or secondary circuit. Repair. |
| 4. | Defective Control PC Board. |
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| Replace. See Procedure for |
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| Replacing PC Boards. |
| 5. | Primary or secondary thermostats |
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| open. Amber thermal protection |
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| light is on: Check for overheat- |
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| ing; make sure fan is operating |
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| and there is no obstruction to free |
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| air flow. |
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Machine has minimum output and | 1. Terminals 75, 76 or 77 grounded | |
no control. |
| to positive output. |
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If all recommended possible areas of misadjustment have been checked and the problem persists,
Contact your local Authorized Field Service Facility.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Authorized Field Service Facility for technical troubleshooting assistance before you proceed.