Diagnostics - Miller PipePro 450 RFC Owner's Manual

8-3. Diagnostics

The following error messages are shown on the
upper and lower displays to indicate specific errors.
Explanations are in the text below:
ERR
ERR
ARC GND
Indicates an arc Indicates a ground
current error.
error.
PLS ERR
WAIT SENS
Indicates no ocv.
Indicates a UIM
communication error.
ERR ARC
• The arc error indicates an arc outage
occurred possibly from a wire feeder error
or power source error. Check wire feeder
and power source. Press any button on
front panel to clear error.
ERR GND
• The ground current error occurs if weld
current is detected in the earth ground
connection. May be caused by a conductor
making contact with unit chassis. Check
and repair feeder weld connections. Press
any button on front panel to clear error.
ERR LINE
• The line error indicates input power is
outside of unit operating range. Check and
correct input power. Cycle power to clear
error.
ERR STRT
• The start error occurs if the user has the
trigger held for more than 3 seconds without
striking an arc and Start Err is enabled. This
error also occurs if trigger jog runs for 30
seconds or more. The error may be cleared
by releasing the trigger, and pressing any
button on the front panel.
ERR
ERR
LINE STRT
Indicates a line Indicates an arc
start error.
error.
E ERR
STOP UNKN
Indicates an Indicates an
unknown error.
emergency stop error.
ERR STUK
• The stuck error occurs if the welding wire
sticks to the workpiece at the end of a weld.
May be caused by poor weld conditions.
The error may be cleared by cutting wire
from workpiece, and pressing any button on
the front panel.
ERR TEMP
• The temperature error indicates welding
power source has overheated
shutdown. The error may be cleared by
allowing unit to cool down, and cycle power
to clear error. If problem persists, check fan
motors for proper operation. If unit is not
overheated, check that input line voltages
are within specifications. If input line
voltages are okay, contact nearest factory
authorized Service Agent.
PLS WAIT
• The uim communication error indicates
user interface module PC7 lost data
communications. Press any button on front
panel to clear error. If condition persists,
contact nearest factory authorized Service
Agent.
ERR
STUK
Indicates a wire
stuck error.
OVER
CRNT
Indicates an
overcurrent error.
ERR SENS
• The sensing error indicates no ocv when
operating with electrode negative in Stick,
TIG or Carbon Arc. Remove volt sense lead
and press any any button on front panel to
clear error.
E STOP
• The emergency stop error indicates no
connection is made to the 72-pin connector
on the rear of the unit. Connect "Y" cable to
rear of welding power source.
ERR UNKN
and
• The unknown error indicates an error was
sent from the process control module PC4
to the user interface module PC7, but the
error condition is unknown. Make sure that
welding power source is isolated from the
welding fixture. Leave the unit powered up
for five minutes and then turn on the
contactor to clear the fault.
OVER CRNT
• The over current error indicates welding
power source primary current of the inverter
is too high. Turn welding power source off
and disconnect unit
Attempting to reset the display to continue
welding may further damage internal
components. Contact nearest factory
authorized service agent.
ERR
TEMP
Indicates a
temperature error.
for servicing.
OM-223 586 Page 61