Symptoms, Major physical or electrical damage is evident, Troubleshooting and repair – Lincoln Electric POWER MIG 11521 User Manual

Page 42: Caution

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OUTPUT PROBLEMS

Observe Safety Guidelines detailed in the beginning of this manual.

PROBLEMS

(SYMPTOMS)

POSSIBLE AREAS OF

MISADJUSTMENT(S)

RECOMMENDED

COURSE OF ACTION

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.

CAUTION

Major physical or electrical
damage is evident.

1. Contact your local Lincoln

Electric authorized field service
facility.

1. Contact Lincoln Electric Service

Department 1-888-935-3877.

The machine is dead--no open
circuit voltage and no wire feed
when the gun trigger is activated.
The cooling fan is not running.

1. Make certain the input power

switch (S1) is in the “ON”
position.

2. Check the input voltage at the

machine. The input voltage
must match the rating plate and
the reconnect panel.

3. Check for blown or missing

fuses in the input lines.

1. Check the input power switch

(S1). It may be faulty.

2. Check for broken or missing

wires at the reconnect panel.

3. Perform the Main Transformer

Test.

There is no open circuit voltage or
wire feed when the gun trigger is
activated. The cooling fan is
running.

1. Make sure the input voltage is

correct and matches the
nameplate rating and reconnect
panel configuration.

2. One of the two thermostats may

be open due to machine
overheating. If the machine
operates normally after a
cooling off period then check for
proper fan operation and
ventilation. Make certain the
machine’s duty cycle is not
being exceeded.

1. The baffle mounted rectifier

bridge may be faulty. Check
and replace if necessary.

2. Perform the Main Transformer

Test.

3. Check the thermostats and

associated leads for loose or
faulty connections. See the
Wiring Diagram.

4. The

internal

triggering

circuit/plugs may be faulty. See
the Wiring Diagram.

5. The control board may be faulty.

TROUBLESHOOTING AND REPAIR