Troubleshooting - Miller Electric 75 Owner's Manual

7-2. Diagnostics (Continued)
RMD OVER
DONE AVER
Indicates RMD Indicates an over
demo is done. average current error.
RMD DONE
The RMD done message indicates the
RMD demo is completed. Pressing
Jog/Purge button will change the screen to
CYCL PWR on the display. Turn unit power
off and back on again.
OVER AVER
The over average error indicates that
current is outside the average range for the
set program parameters. Check and correct
program parameters. Press Jog/Purge
button to clear error.

7-3. Troubleshooting

Trouble
Wire feeds, shielding gas flows, but
electrode wire is not energized.
Electrode wire feeding stops or feeds
erratically during welding. erratically during welding
Motor runs slowly.
Wire feeder power is on, displays light
up, but unit is inoperative.
UNIT
COMM
Indicates a contactor
Indicates a CRC
on error.
PCM bus error.
UNIT COMM
The unit communication error indicates
the data bus on the PCM board is not
functioning properly. Press Jog/Purge
button to clear error.
REL TRIG
The release trigger error indicates the
user held the gun trigger after a timed weld
was completed causing the contactor to
remain on. Press Jog/Purge button to clear
error.
Y Disconnect power before troubleshooting
Check and secure weld cable connections (see Section 4-2).
Check gun trigger connection. See gun Owner's Manual.
Check gun trigger. See gun Owner's Manual.
Readjust hub tension and drive roll pressure (see Section 4-9).
Change to correct size drive roll (see Table 9-1).
Clean or replace dirty or worn drive roll.
Incorrect size or worn wire guides.
Replace contact tip or liner. See gun Owner's Manual.
Remove weld spatter or foreign matter from around nozzle opening.
Have Factory Authorized Service Agency check drive motor or motor control board PC1.
Check for correct input voltage.
Check welding gun trigger leads for continuity, and repair leads or replace gun.
TRIG
REL
STUK
TRIG
Indicates a trigger
closed error.
TRIG STUK
The trigger stuck error indicates the user
held the gun trigger during power up. Press
Jog/Purge button to clear error.
ERR UNKN
The unknown
malfunction in the system somewhere.
Press Jog/Purge button to clear error.
Remedy
ERR
UNKN
Indicates an
unknown error.
error indicates a
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