Filter
Top Products
Table
7-2.
Troubleshooting
TROUBLE
PROBABLE
CAUSE
REMEDY
No
weld
output;
wire
does
not
feed.
Line
Disconnect
Switch
in
OFF
position.
Place
Line
Disconnect
Switch
in
ON
position.
.
Improper
electrical
input
con-
nections.
See
Section
4-12
for
proper
input
connections.
Input
voltage
jumper
links
not
in
proper
position.
See
Section
4-12
for
proper
jumper
link
position.
Line
fuse(s)
open.
Check
and
replace
open
line
fuses.
Main
rectifier
SRi
overheating
(thermal
shutdown).
Allow
rectifier
to
cool
down
(see
Section
7-7).
Gun
switch,
or
gun
switch
leads.
See
gun
Owners
Manual.
POWER
switch
Si.
Replace
Si.
Switch
control
relay
CR1.
Replace
CR1.
No
weld
output;
wire
feeds.
THICKNESS
VOLTS
plug
not
secure
in
receptacle.
Secure
connection.
Work
clamp
connection
loose
or
incomplete
due
to
rust,
paint,
etc.
on
surface
of
workpiece.
Check
work
connection
for
good
metal-to-metal
contact.
Contact
tube.
See
gun
Owners
Manual.
Low
weld
output.
Low
input
voltage.
Check
for
proper
input
voltage.
Input
voltage
jumper
link
in
wrong
position.
SeeSection4-i2forproperjumperlinkposition.
Electrode
wire
stops
feeding
while
welding.
~
Circuit
breaker
CB2.
Check
and
reset
CB2
if
necessary
(see
Section
7-6).
Sharp
or
excessive
bend
in
gun
cables
or
liners,
Straighten
gun
cables
and/or
replace
liners
(see
gun
Owners
Manual).
Incorrect
hub
tension.
Readjust
hub
tension
(see
Section
4-li).
Contact
tube
opening
re-
stricted;
burnback
of
wire
into
tube.
See
gun
Owners
Manual.
.
Friction
in
gun.
See
gun
Owners
Manual.
Gun
liner
dirty,
restricted.
See
gun
Owners
Manual.
Broken
or
damaged
gun
liner.
See
gun
Owners
Manual.
Worn
drive
rolls.
Replace
drive
rolls
(see
Section
7-2).
Drive
rolls
misaligned.
Realign
drive
rolls
(see
Sections
7-2
and
7-3).
Excessive
loading
of
drive
mo-
tor.
Clear
restriction
in
drive
assembly.
Drive
motor
brushes.
Check
and
replace
brushes
if
necessary
(see
Section
7-5).
Drive
Motor
M.
Check
and
replace
motor
if
necessary.
Gun
trigger
switch
inoperative
or
leads
broken.
See
gun
Owners
Manual.
Unit
shuts
down
while
welding.
Fan
motor
FM.
Check
and
replace
FM
if
necessary.
OM-113
336
Page
29