Lincoln Electric IDEALARC R3R-500 - Manual (Page 43)

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TROUBLESHOOTING & REPAIR
F-9 F-9
IDEALARC R3R
Observe Safety Guidelines TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
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.
PROBLEMS
(SYMPTOMS) POSSIBLE AREAS OF
MISADJUSTMENT(S) RECOMMENDED
COURSE OF ACTION
WELDING PROBLEMS
Poor arc characteristics. 1. Make sure the correct weld pro-
cedures are being used.
(Electrode, Polarity, etc.)
2. Check the welding cables for
loose or faulty connections.
1. Perform the SCR/Diode
Rectifier Bridge Test.
2. Perform the Main Transformer
Test.
3. The control board may be
faulty. Replace.
The welding arc is variable and
sluggish. 1. Check the input voltage at the
R3R, making sure the correct
voltage and all three phases are
being applied to the machine.
2. Make sure the welding
process is correct for the
machine settings.
3. Check the welding cables for
loose or faulty connections.
Also make sure the cables are
sized correctly for the welding
current.
1. Perform the SCR/Diode
Rectifier Bridge Test.
2. Perform the Main Trans-
former Test.
3. The control board may be
faulty. Replace.