User Guide

E-3
TROUBLESHOOTING
E-3
STT-10
Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
CAUTION
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Motor does not turn when trigger is
pulled.
The drive motor does not turn
although arc voltage is present and
the gas solenoid is on.
No control of wire feed speed.
Motor turns. Gas solenoid operates
properly and arc voltage is present.
Wire feed speed can be set on the
display, but has no control of the
wire feed speed.
Wire feed motor turns and gas sole-
noid operates, but no arc voltage is
present.
Speed does not change when weld
current flows.
Cold feed forward or cold feed
reverse buttons on keypad do not
work, but motor control otherwise
functions properly
1. The wire drive motor may be
overloaded. "Hxx" will be dis-
played on the WFS display,
where "xx" is the number of sec-
onds until the wire drive attempts
to run again.
2. A jumper plug or K1558-1
Remote Switch Interface Module
must be properly installed into
connector J5.
3. Damaged wiring in the trigger cir-
cuit.
4. Control p.c. board failure.
1. Damaged leads to the drive
motor.
2. Damaged wire drive motor.
3. Damaged control p.c. board.
1. Damaged leads to the motor
tachometer.
2. Damaged tachometer.
3. Damaged control p.c. board
1. Power source is unable to pro-
vide arc voltage because of ther-
mal shutdown or other failure.
1. Run-in and weld speeds are set
to the same value.
2. Current sensing reed switch is
not operating properly.
1. The connector from the control
p.c. board to the display p.c.
board or the connector from the
display p.c. board to the keypad
are loose or improperly inserted.
2. Damaged keypad
3. Damaged display p.c. board.
4. Damaged control p.c. board.
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field Service Facility.