Miller Electric KC237900 - Manual (Page 28)

OM-530 Page 24
MOVING PARTS can cause serious injury.
•
Keep away from moving parts.
HOT SURFACES can cause severe burns.
•
Allow cooling period before servicing.
Troubleshooting to be performed only by
qualified persons.
It is assumed that the unit was properly installed accord-
ing to Section 3 of this manual, the operator is familiar
with the function of controls, the unit was working prop-
erly, and that the trouble is not related to the welding
process.
The following table is designed to diagnose and provide
remedies for some of the troubles that may develop in
this unit. Use this table in conjunction with the circuit dia-
gram while performing troubleshooting procedures. If
the trouble is not remedied after performing these pro-
cedures, contact the nearest Factory Authorized Serv-
ice Station. In all cases of equipment malfunction,
strictly follow the manufacturer’s procedures and in-
structions.
IMPORTANT: Be sure that all receptacle connections
are secure, and that all controls and switches are in the
proper positions before beginning troubleshooting pro-
cedures.
Table 6-3. Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY
No weld output. Poor and/or improper connec-
tions from TIG-Unit to welding
power source output terminals. Check connections. Be sure that they are
correct and secure (see Sections 3-3 and
3-4).
No output from welding power
source. See welding power source Owner’s Manual.
AMPERAGE and/or OUTPUT
(CONTACTOR) switches on
welding power source not in
proper positions. Be sure that the AMPERAGE control switch
is in the REMOTE position, and the OUTPUT
(CONTACTOR) switch is in the appropriate
position for the selected welding situation.
POLARITY SWITCH S3 not
making proper contact. Be sure that the POLARITY SWITCH S3 is
placed completely into the desired position.
No control of the output; none of
the controls function. Fuse F2; poor connection to
welding power source input
terminal board. Check fuse F2 and replace if necessary.
Check input terminal board on welding power
source for loose or broken connections. Be
sure that all connections are intact and
secure.
Erratic weld output; controls not
operating properly. Loose connections at amphe-
nol receptacles. Check both amphenol receptacles and be
sure that they are properly tightened.
Remote OUTPUT (CONTACTOR)
control does not function. Fuse F1. Check fuse F1, and replace if necessary.
AMPERAGE ADJUSTMENT con-
trol and Remote AMPERAGE and/
or OUTPUT (CONTACTOR) func-
tion properly; no output at duplex
receptacle RC1, gas and coolant
does not flow, and high frequency
is inoperative. Circuit breaker CB1. Manually reset CB1.