Lincoln Electric POWER FEED 10M SINGLE/DUAL SVM172-A Service Manual page 109

F-5
POWER FEED 10M
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The purge switch on the wire drive
unit does not activate the gas sole-
noid, but gun trigger closure in the
MIG or pulse modes does activate
the solenoid. The LEDs are
steady green on the power source,
Control Box and wire drive unit.
The COLD INCH/GAS PURGE
switch does not turn on the wire
drive motor but gun trigger closure
in the MIG or Pulse modes does
activate the wire drive motor.
The LEDs are steady green on the
power source, Control Box and
wire drive unit.
The voltmeter on the Control Box
does not function properly even
though the STATUS LEDS are
steady green.
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 at 1-888-935-3877 for electrical troubleshooting assistance before
you proceed.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
FUNCTION PROBLEMS (Continued)
1. Make certain the COLD
INCH/GAS PURGE switch is
operating properly.
2. Check for loose or faulty leeds
between COLD INCH/GAS
PURGE switch and the wire
drive control board. See wiring
diagram.
1. Make certain the COLD
INCH/GAS PURGE switch is
operating properly.
2. Check for loose or faulty leeds
between the COLD INCH/GAS
PURGE switch and the wire
drive control board. See wiring
diagram.
1. Make sure the DIP switches are
configured correctly for the weld-
ing polarity being used.
Setting Dip Switches in the
Wire Drive in the Installation
section of this manual.
2. Check the #67 lead on the wire
drive unit. Make sure it is con-
nected to the motor gear box and
also the voltage sense PC board.
3.Check the work sensing leads on
the Power Wave 455 power
source. Check leads #202 (Neg.
output terminal) and #206 (pos.
output terminal).
Wave 455 wiring diagram.
esternal voltage sensing is uti-
lized, Check
between the 4-pin receptacle on
the front of the Power Wave 455
and the workplace.
CAUTION
POWER FEED 10M SINGLE/DUAL
RECOMMENDED
COURSE OF ACTION
1. If the COLD INCH/GAS PURGE
switch is operating correctly and
the associated leeds are OK.
The feedhad board may be
faulty.
1. If the COLD INCH/GAS PURGE
switch is operating correctly and
the associated leads are OK.
The feedhead board may be
faulty.
1. Check leads #513 and #514 from
J85 on the feedhead board to the
See voltage sense PC board.
2. Perform the Voltage Sense
Board Test.
3. The display board may be faulty.
4. The feedhead control board may
be faulty.
5. The Control Box control board
may be faulty.
See Power
If
the #21 lead
F-5