Lincoln Electric POWER MIG SVM167-A Service Manual page 42

F-6
Troubleshooting Guide –
components and for troubleshooting of specific circuits.
PROBLEMS
(SYMPTOMS)
Output voltage and wire feed speed
is present when the gun trigger is
NOT activated.
The machines output is low. Welds
are "cold". The weld beads are
rounded or "humped" demonstrat-
ing poor wetting into the plate. The
machine cannot obtain full rated
output of 200 amps at 22VDC.
The output voltage is continuous
when the gun trigger is NOT activat-
ed. The wire feed functions normal-
ly.
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.
TROUBLESHOOTING AND REPAIR
See Wiring Diagrams for location of specified
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS (Continued)
1. Remove the gun assembly. If
the problem is resolved, the gun
assembly is faulty.
replace. If the problem is NOT
resolved, the fault is within the
POWER MIG® 215 machine.
1. Check the input voltage. Make
sure the machine is configured
properly for the input voltage
being applied.
2. Make sure the settings for wire
feed speed and voltage are cor-
rect for the process being used.
3. Make sure the electrode polarity
is correct for the process being
used.
4. Check the welding cables and
gun for loose or faulty connec-
tions.
1. The output contactor may be
stuck closed.
CAUTION
POWER MIG® 215
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. Check for "shorts" in the trigger
circuitry within the POWER
Repair or MIG® 215 machine.
Wiring Diagram.
2. The control board may be faulty.
1. Check for loose or faulty con-
nections on the heavy current
carrying
POWER MIG® 215.
Wiring Diagram.
2. The output capacitors may be
faulty. Check for loose connec-
tions at the capacitors.
check for leaky capacitors.
Replace if necessary.
WARNING: The liquid electrolyte
in these capacitors is toxic.
Avoid contact with any portion of
your body.
3. The output selector switch may
be faulty. Check for good con-
tact and continuity (zero ohms)
through the switch.
Wiring Diagram.
4. Perform the Output Contactor
Test.
5. Perform the Output Bridge
Rectifier Test.
6. Perform the Main Transformer
Test.
1. Perform the Output Contactor
Test.
F-6
Observe Safety Guidelines
See the
leads inside the
See the
Also
See the