Lincoln Electric POWER WAVE STT Operator's Manual page 24

POWER WAVE ® STT ® MODULE
PROBLEMS
(SYMPTOMS)
Input fuses keep blowing
Machine will not power up (no lights on
power source, STT Module or Wire Feeder).
®
No Status Light on STT ® Module
Machine won't weld, when attached to
STT ® Module.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized
Field Service Facility for technical troubleshooting assistance before you proceed.
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE
CAUSE
BASIC MACHINE PROBLEMS
1. Improperly sized input fuses.
2. Improper Weld Procedure requiring out-
put levels in excess of machine rating.
3. Major physical or electrical damage is
evident in the power source when the
sheet metal covers are removed.
1. No Input Power.
1. 40VDC input not present at STT
2. Malfunctioning Status LED.
1. STT ® Status Error.
2. STT ® Thermal Error.
3. 40VDC input not present at STT
4. Internal open circuit
CAUTION
E-6
RECOMMENDED
COURSE OF ACTION
1. Make sure fuses are properly sized. See
installation section of this manual for rec-
ommended sizes.
2. Reduce output current, duty cycle, or
both.
3. Contact your local authorized Lincoln
Electric Field Service facility for techni-
cal assistance.
1. Make sure input supply disconnect has
been turned ON. Check input fuses. Make
certain that the Power Switch on the
power source is in the "ON" position.
1 Check ArcLink ®
® Module.
wiring diagram.
• If wire feeder is functional and con-
nected through the STT
pect connection issue in STT
Verify condition of LED's on STT
Switch PCB (viewable through rear and
left side louvers.
2. Verify status LED is properly installed and
has not disengaged from the lens.
1. Make certain the polarity of the STT
Module is correct per the connection dia-
gram (Positive to STT Input).
• If polarity is correct, verify condition of
LED's on STT
through rear and left side louvers.
2. See "Thermal error indiction..." section.
® Module.
3. See "No Status Light on STT
4. Check for loose or broken connection in
STT ® Module weld circuit.
TROUBLESHOOTING
cable. Verify 40VDC per
® Module, sus-
® Module.
®
®
® Switch PCB (viewable
® ..." section.