Lincoln Electric SVM127-A service manual Troubleshooting & Repair

Models: SVM127-A

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F-21

 

F-21

TROUBLESHOOTING & REPAIR

 

TROUBLESHOOTING GUIDE

 

Observe Safety Guidelines

 

detailed in the beginning of this manual.

 

 

 

PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

(SYMPTOMS)

MISADJUSTMENT(S)

COURSE OF ACTION

 

 

 

 

 

STARTING PROBLEMS

 

 

Voltage seems to be too high or the

1. Adjust the "start" trimmer on the

1. The LN-9 voltage PC board may

arc flares at the start of weld.

voltage PC board. It should be

be faulty. Replace.

Welding is good.

only slightly higher than the weld

 

 

 

voltage. See Starting Charac-

 

 

 

teristics in the Operation section

 

 

 

of this manual.

 

 

 

2. Put the Lincoln power source in

 

 

 

the "Machine Control" mode.

 

 

 

Jumper the "BYPASS" pins on

 

 

 

the LN-9 voltage PC board.

 

 

 

Adjust the weld voltage from the

 

 

 

power source for the process

 

 

 

being used. If the correct volt-

 

 

 

age cannot be set, the power

 

 

 

source may be faulty.

 

 

 

3. Check for correct control cable

 

 

 

connections to the power

 

 

 

source.

 

 

 

 

 

 

CAUTION

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

LN-9 Wire Feeder

Page 79
Image 79
Lincoln Electric SVM127-A service manual Troubleshooting & Repair