Miller S-74 MPa Plus Technical Manual

TM-273245 Page 48 S-74 MPa Plus
SECTION 10 − MAINTENANCE
! Disconnect power before maintaining.
n = Check ~ = Clean l = Replace
Every
Spool
of Wire
or Wire
Change
n~ Gun Liner
Every
3
Months
l Unreadable Labels ~ Weld Terminals nl Weld Cable l Cracked Parts
n 14-Pin Cord n Gas Hose and Fittings n Gun Cable
Every
6
Months
Or
~ Inside Unit ~ Drive Rolls
10-1. Diagnostics
The following error messages are shown on the upper and lower displays to indicate specific errors. Explanations are in the text below:
TRIG ERR Indicates a trigger error. A trigger error occurs if the user has the trigger held for more than two
minutes without striking an arc. This error also occurs if the trigger is held when the feeder is powered
up. The error may be cleared by releasing the trigger.
JOG ERR Indicates a jog switch error. A jog switch error occurs if the user has the jog switch held for more than
two minutes. This error also occurs if the jog switch is held when the feeder is powered up. The error
may be cleared by releasing the jog switch.
PURG ERR Indicates a purge switch error. A purge switch error occurs if the user has the purge switch held for
more than one minute. This error also occurs if the purge switch is held when the feeder is powered
up. The error may be cleared by releasing the purge switch.
COOL ERR Indicates a water flow switch error. A water flow switch error occurs if no water flow is detected while
the trigger is pressed. Jog and purge switches will behave normally even if no water flow is detected.
Dip switch 2 on the motor control pcb must be set to enable this error. The error is cleared when wa-
ter flow is detected or when the error is disabled.
TEST ERR.1 or
ERR.2
TEST ERR.1 Indicated a button is stuck on the Display/Interface board PC 2. Release button to clear
issue or inspect and replace PC2.
TEST ERR.2 Indicates wirefeeder boards are not receiving enough power. Check 24 VAC power on
PC1, check DC supply voltages on PC1.
COMM ERR Indicates a serial communication error. A communication error occurs 2 seconds after a loss of com-
munication between the motor control pcb and the front panel pcb.
1234 ERR.M Indicates a motor control pcb error. If this error occurs, replace Motor Control Board PC1.
1234 ERR.F Indicates a front panel pcb error. If this error occurs, replace Interface/Display board PC2.
R.Tac ERR Indicates the right push motor tachometer circuit has an error.
L.Tac ERR Indicates the left push motor tachometer circuit has an error.
G.Tac ERR Indicates tachometer in push-pull gun has an error.

Miller S-74 MPa Plus Specifications

General

Brand	Miller
Model	S-74 MPa Plus
Category	Wire Feeders
Language	English