C-
1
TROUBLESHOOTING
C-
1
Rev. 05
OPTIMARC
®
AC/DC 350-TP
CAUTION
If for any reason you do not understand the test procedures or are unable to
perform the tests/repairs safely, contact your local authorized Lincoln Electric
Field Service Facility for technical assistance.
Observe all Safety Guidelines detailed in the beginning and throughout this menual.
Problems (Symptoms)
Possible Areas of Misadjustment(s)
Recommended Course of Action
Output Problems
Major physical or electrical damage
is evident when the sheet metal
covers are removed.
None
Contact your local authorized
Lincoln Electric Field Service
facility for technical assistance.
Input breaker keeps tripping.
1.
Make certain that fuses or
breakers are properly sized. See
Installation section of this manual
for recommended fuse and
breaker sizes.
2.
Welding procedure is drawing too
much output current, or duty cycle
is too high. Reduce output current,
duty cycle, or both.
3.
There is internal damage to the
power source.
If there is internal damage, contact
an authorized Lincoln Electric
Service facility for technical
assistance.
Machine will not power up
(no display, no fan running, etc.).
1.
Make certain that the power to the
machine is energized normally
and is within the operating range.
Check if the main power switch in
control box of power cabin is
turned on.
Thermal protection symbol display.
1.
Check for proper fan operation.
(Fan should run whenever output
power is on.) Check for material
blocking intake or exhaust louvers,
or for excessive dirt clogging
cooling channels in machine.
2.
Machine may have been operated
above it’s duty cycle.
Clear obstruction or repair fan.
After machine has cooled, reduce
load, duty cycle, or both.
Machine won’t weld, can’t get any
output.
1.
Red fault identifications appear
2.
If the thermal protection symbol
displays, see thermal protection
symbol display section.
Refer to error symbol
Contact your local authorized
Lincoln Electric Field Service
facility for technical assistance.
Machine won’t produce full output.
1.
Input voltage may be too low,
limiting output capability of the
power source.
2. Current or voltage display meter is
not properly calibrated.
3. The welding cable and work cable
are too long, or their across area
art too small.
Correct input voltage level.
Contact your local authorized
Lincoln Electric Field Service
facility for technical assistance.
Shorten welding cable and work
cable, or use bigger size cables
for reducing the voltage drop on
cables.
General degradation of the weld
performance.
1.
Check for electrode holding
problems, bad connections,
excessive loops in cabling, etc.
2.
Verify weld mode is correct for
processes.
3.
The power source may require
calibration.
Contact an authorized Lincoln
Electric Service facility for
technical assistance.
The welding arc is not stable and
soft.
1. Verify the proper polarity is being
used for the weld procedure.
2. Check all electrode and work
connections.
3. Verify the parameters of output
current and shielding gas(TIG
mode) are proper for the welding
procedure.
If PC board in machine is at fault,
contact an authorized Lincoln
Electric Service facility for
technical assistance.