Machine shuts down while arc
gouging and all lamp indicators on
front panel are lit. “ECL”, “ECH”,
or “CCS” appears on display as
machine is shutting down.

1. Check to make sure that the

machine settings match the
weld application.

2. Check to make sure the prop-

per carbon arc rod is being
used. The maximum carbon
arc rod for the Commander 400
is 5/16”.

3. Attempt to arc gouge at a less-

er current, if the application will
permit.

4. If the machine shuts down

while arc gouging in the gener-
al fab tap, use the CV tap
instead. This is also an accept-
able process.

1. Check for poor connections at

J4 pins 1, 2, 3, 6 & 7 at the con-
trol pc board. Also, perform the
Exciter Voltage Feedback
Test.

2. Check for loose or faulty con-

nections or wires at the T1, T2,
or T3 capacitor connection
block and back to the capacitor
bank. On machines equipped
with L10953-1 Exciter
Feedback module asbly, check
leads T1, T2, & T3 for faulty
connections.

3. Check for loose or faulty con-

nections at leads 268, 269 &
270 from the exciter pc board
to J4 pins 1, 2 & 3 on the con-
trol board.

4. Perform the Exciter Capacitor

Bank Test.

5. Check for poor connections at

the J1 molex plug at the control
pc board. Also, perform the
Shunt Calibration Test.

6. Perform the Engine Throttle

Adjustment Test.

7. Check exciter waveforms as

illustrated in the Oscilloscope
Waveforms Section.

COMMANDER 400

TROUBLESHOOTING GUIDE

Observe Safety Guidelines

detailed in the beginning of this manual.

PROBLEMS
(SYMPTOMS)

POSSIBLE AREAS OF
MISADJUSTMENT(S)

RECOMMENDED
COURSE OF ACTION

WELDING PROBLEMS

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 1-
800-833-9353 (WELD).

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