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TROUBLESHOOTING & REPAIR
F-9 F-9
IDEALARC CV-400
TROUBLESHOOTING GUIDE Observe Safety Guidelines
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, Gas, etc.)
2. Check the welding cables for
loose or faulty connections.
1. Check the output capacitors and
connections. A capacitor failure
is indicated if the small vent plug
on top of a capacitor is raised or
blown out.
WARNING: The liquid elec-
trolyte in these capacitors is
toxic. Avoid contact with any
portion of your body. Clean
up vented electrolyte using
rubber gloves and a water
dampened cloth. Any elec-
trolyte which gets on skin,
clean with soap and water.
2. The control board may be faulty.
Poor arc striking with semiautomat-
ic or automatic wire feeders.
1. Make sure the correct weld pro-
cedures are being used.
(Electrode, Gas, etc.)
2. Check the welding cables for
loose or faulty connections.
1. The control board may be faulty.
The welding arc is variable and
sluggish.
1. Check the input voltage at the
CV-400, 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 set-
tings.
3. Check the welding cables for
loose or faulty connections.
Also make sure cables are sized
correctly for the welding current.
1. Perform the
SCR/Diode Recti-
fier Bridge Test.
2. Perform the
Main Transformer
Test.
3. The control board may be faulty.
Replace.