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Welder will not start.
Welder will not weld (Contactors
operating properly)
Welder will not weld (Contactors not
operating).
Welder welds at min. only no control.
Supply line fuse blown.
Open supply line lead.
Wrong supply line voltage.
Electrode or ground cable loose or
broken.
Welder control circuit dead: No volt-
age across Control Transformer X1-
X2.
Thermostat on coil tripped. Welder
overheated (Fan motors operating).
Fuse (or thermostat – below code
7600) on control panel open; Control
circuit overloaded. (Fan motors oper-
ating)
Circuit across #2 and #4 not working
properly.
Wire feeder control power; No volt-
age across #31 and #32.
Remote control switch in wrong posi-
tion.
Control rheostat open.
Control circuit open.
Open saturable reactor control coil
or connection.
Look for possible cause and repair.
Replace fuse.
Repair.
Provide nameplate specified voltage.
Tighten connection or repair broken
cable.
Check Control Transformer primary
voltage and if OK, replace trans-
former.
Check operation of fans and make
sure there is no obstruction to air
flow. Do not operate in excess of
welder rating.
SCR’s or diodes on heat sink
assembly or P.C. board failed –see
Trouble “Welder welds at max. or
min. only – no control”. Make repairs
and replace fuse.
Check connections at terminal strip
and wire feeder. Relay contacts not
closing. Repair as required.
Check fuse and replace if no good.
Switch to ‘Panel Control’ for welder
rheostat. Control and “Remote
Control” for other control.
Replace rheostat.
1.No voltage across #41 and #44 –
Repair broken leads or reconnect
loose leads.
2. Diodes or SCR’s on heat sinks open
or disconnected. Repair or replace.
3. P.C. board plug disconnected – Check
plug connection and plug in properly.
4. P.C. board failed. Determine cause
and replace board.
5. Open circuit ar R
1
– Repair or replace.
Repair connection or replace coil.