POWER WAVE 355M/405M

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F-7

TROUBLESHOOTING AND REPAIR

 

F-7

 

Observe Safety Guidelines detailed in the beginning of this manual.

 

 

 

 

 

PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

 

 

 

 

(SYMPTOMS)

MISADJUSTMENT(S)

COURSE OF ACTION

 

 

 

FUNCTION PROBLEMS

 

 

Current

 

 

 

 

 

 

The machine often “noodle welds”

1. The machine may be trying to

1. Perform

the

 

with a particular procedure. The

deliver too much power. When

Transducer Test.

 

 

output is limited to approximately

the average output current

 

 

 

 

100 amps.

 

exceeds a maximum limit, the

2. The control board may be faulty.

 

 

 

machine will “phase back” to

 

 

 

 

 

 

protect itself. Adjust the proce-

 

 

 

 

 

 

dure or reduce the load to lower

 

 

 

 

 

 

the current draw from the Power

 

 

 

 

 

 

Wave machine.

 

 

 

 

Excessively long and erratic arc.

1. Check for proper configuration 1.

Check the connections between

 

and implementation of voltage

the voltage sense receptacle

 

sensing circuits.

and the control board. See the

 

 

Wiring Diagram.

 

2.

The control board may be faulty.

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 1-888-935-3877.

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Lincoln Electric 355M, 405M service manual Current