Lincoln Electric SP-250 service manual Warn

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F-4

TROUBLESHOOTING & REPAIR

F-4

TROUBLESHOOTING GUIDE - Observe all Safety Guidelines detailed throughout this manual

PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

(SYMPTOMS)

MISADJUSTMENTS(S)

COURSE OF ACTION

OUTPUT PROBLEMS

No Open Circuit Voltage output and

1.

The thermostats may be open 1.

Check thermostats and associ-

no wire feed when gun trigger is

due to machine overheating. If

ated leads for loose or broken

pulled. Display is functioning proper-

machine operates normally after

connections.

See

Wiring

ly.

a cooling off period then check

Diagram.

for proper fan operation and

ventilation.

Make certain that

2.

Perform The

Main Transformer

the machine's duty cycle is not

Test.

being exceeded.

3.

The control board may be faulty.

2.

Check the gun trigger circuit.

Replace.

Leads #324 to #325 should have

continuity ( zero ohms) when the

gun trigger is pulled. If not then

the gun may be faulty - replace.

Wire feeds but welding output is low

1.

If an error message is displayed

1.

Check for loose or faulty con-

causing wire to "stub".

on the display then proceed to

nections of the heavy current

Welds are "cold". Machine cannot

Explanation

of Prompting and

carrying leads.

obtain full rated output of 250 amps

Error Messages Section.

at 26 volts.

2.

The output capacitor bank may

2.

Make sure that the proper wire

be faulty.

Check for loose con-

and procedures are being used.

nections at the capacitors. Also

check

for

leaky

capacitors.

3.

Check gun and work cable for

Replace if necessary.

WARN-

loose or faulty connections.

ING:

The

liquid

electrolyte in

these capacitors is toxic. Avoid

contact with any portion of your

body.

3.

Perform

the

SCR

Rectifier

Assembly Test.

4. Perform the Main Transformer

Test.

5. The control board may be faulty. Replace.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, con- tact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call 216- 383-2531 or 1-800-833-9353

IDEALARC SP-250