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F-9

TROUBLESHOOTING & REPAIR

F-9

 

Observe all Safety Guidelines detailed throughout this manual

 

 

 

 

 

 

 

 

 

PROBLEMS

 

POSSIBLE AREAS OF

 

RECOMMENDED

 

 

(SYMPTOMS)

 

MISADJUSTMENT(S)

 

COURSE OF ACTION

 

 

 

 

 

 

 

 

 

 

 

WELDING PROBLEMS

 

 

 

 

 

 

 

 

Poor welding, weld settings drift, or 1.

Make sure the machine settings

1.

Check the operation of the mode

output power is low.

are correct for the weld process

 

switch (S2) and the associated

 

 

 

being used.

 

circuitry. See wiring diagram.

 

 

2.

Check machine performance on

2.

Check for loose or faulty connec-

 

 

 

LOCAL control. If OK then the

 

tions in the heavy current carrying

 

 

 

remote control device may be

 

leads (i,e,. output diodes, output

 

 

 

faulty. Check or replace.

 

terminals, shunt and main trans-

 

 

 

 

 

former.)

 

 

 

3. Check the input voltages and

 

 

 

 

 

 

input voltage reconnect

3.

Perform Output Diode Test.

 

 

 

 

procedures. See Installation

 

 

 

 

 

 

Section of this manual.

4.

Perform Control Board Voltage

 

 

 

 

 

Test.

 

Poor stick electrode welding

1.

Check for loose or faulty welding

 

 

performance. The arc pops out.

 

cables.

1.

Check for loose or faulty connec-

 

 

 

 

tions in the heavy current carrying

 

2.

Is the electrode DRY? Try weld-

 

leads (i,e,. output diodes, output

 

 

ing with another electrode from a

 

terminals, shunt and main trans-

 

 

different container. Make sure

 

former.)

 

 

you have the correct electrode for

 

 

 

 

the application.

2.

Perform Output Diode Test.

 

3.

Make sure the machine settings

3.

Perform Control Board Voltage

 

 

are correct for the weld process

 

Test.

 

 

being used.

 

 

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 Welding Problems