Troubleshooting - Miller Maxtron 450 Owner's Manual

5-4. Troubleshooting
I__
Trouble
Remedy
No weld
output;
unit completely mop-
erative.
Place line disconnect switch in On position (see Section 3-10).
Check fuse Fl and replace if necessary
(see
Section
5-3).
Check and
replace
line fuse(s), if
necessary, or
reset
circuit breaker (see Section
3-10).
Check for proper
input
power connections
(see
Section
3-10).
Check for proper
jumper
link
position (see Section 3-10).
No weld
output;
Power switch
on;
fan
on.
If using
remote
control, place Output (Contactor) switch in Remote 17/14 position, and connect
remote control to Remote 14
cr
Remote 17 receptacle (see Sections 3-6 and 3-7). If remote is not
being
used, place Output (Coritactor) switch in On position.
Check, repair,
or
replace remcte
control.
Unit overheated. Allow unit
to
cool with fan On (see Section 4-3).
Have Factory Authorized SeMce Station/Service Distributor check unit.
Low weld
output
with
no
control. Check position of AmperageAoltage Control switch.
Have Factory
Authorized Service Station/Service Distributor check control board PCi.
Limited
output
and low open-circuit
voltage,
Check incoming power for
correct
voltage. Check and replace line fuse(s), if
necessary, or
reset
circuit breaker (see Section 3-10).
Check for proper
jumper
link position (see Section 3-10).
Check for proper input and
output
connections (see Section 3-10).
Erratic
or
improper
weld
output.
Use proper size and
type
of weld cable (see Section
3-4).
Clean and tighten all weld connections.
Check for proper input
and
output
connections (see
Section 3-10).
Replace electrode.
Remote device completely
inoperative.
Check remote control connections (see
Sections
3-6 and 3-7).
If remote device connected to Remote 14 receptacle, reset circuit
breaker CB1
CB2,
and/or CB3
(see
Section
5-3)
If remote device connected
tc
Remote 17
receptacle,
check fuses F3 and/or F4 and
replace
if need
ed (see
Section 5-3).
Fan
not operating.
Check for and
remove
anything blocking
fan movement.
Have Factory
Authorized Service Station/Service Distributor check fan
motor.
No 115 volts
ac
output at Remote 14
receptacle.
Reset circuit breaker CB1
(see
Section
5-3).
No 24 volts
ac
output at
Remote 14
receptacle.
Reset circuit breaker CB2 (see Section 5-3).
No 115 volts
ac
output at
twistlock
receptacle.
Reset circuit breaker CB3 (see Section 5-3).
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