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F-5

TROUBLESHOOTING & REPAIR

F-5

 

Observe all Safety Guidelines detailed throughout this manual

 

 

 

 

 

 

 

 

PROBLEMS

 

POSSIBLE AREAS OF

RECOMMENDED

 

 

(SYMPTOMS)

 

MISADJUSTMENT(S)

COURSE OF ACTION

 

 

 

 

 

 

 

OUTPUT PROBLEMS

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No output but the fan operates nor- mally.

1.The mode switch must be in one of the SMAW modes or if in the GTAW mode the remote trigger circuit must be activated.

2.The Local/Remote switch (S3) must be in the LOCAL position unless a remote control device is attached to the remote receptacle.

3.If the machine has not been used for a long time and is connected for 380 VAC or higher, the capacitors may need “condition- ing”. See Input Filter Capacitor Conditioning.

4.The machine may be overheated. Check the thermal indicator light. Wait for the machine to cool and the thermostats to reset.

1.Perform the Auxiliary Transformer Test.

2.Check for loose or broken connections on the high current carrying parts of the V250-S. (i.e., output diodes, output terminals, shunt and main transformer connections.)

3.Check the continuity of the normally closed thermostats and associated wiring. See wiring diagram.

4.Perform the Output Diode Test.

5.Perform the Capacitor Balance Test.

6.Perform the Protection Circuit Test.

7.Perform the Power Board Voltage Checks.

8.Perform the Control Board Voltage Checks.

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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 216-383-2531 or 1-800-833-9353.

INVERTEC V250-S

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Lincoln Electric V250-S service manual Possible Areas, Perform the Control Board Voltage Checks