Miller Electric SS-74S12 - Manual (Page 24)

OM-1500−11 Page 20
6-2. Diagnostics
• Error Indications
Error conditions are indicated by LED3 on
PC1 or on display (on models with meters). To
view LED3, turn Off unit, remove wrapper, and
turn unit On. LED3 is most easily observed
from the left side of the unit.
The LED blinks in a 2.5 second cycle. The
number of blinks in this period indicates the
type of error.
The priority of the errors is related to the num-
ber of blinks indicating the error. The more
blinks, the more severe the error (motor error
is top priority). A higher priority error overrides
a lower one (if a motor error and a communica-
tion error existed, the light would blink four
times for the motor error).
• The communication error occurs 2.5 sec-
onds after a loss of communication between
the motor and the optional meter board. The
user may continue to weld with this error.
The error may be cleared by turning power
Off, waiting a minimum of two seconds, and
turning power On.
• The trigger error occurs if the user has the
trigger held for more than two minutes with-
out striking an arc (providing current over-
ride is not enabled), or if the user holds the
trigger past the postflow phase in a timed
weld. This error also occurs if the trigger is
held when the feeder is powered up. The er-
ror may be cleared by releasing the trigger.
• The tach error occurs 2 seconds after the
loss of tachometer feedback. The user may
continue to weld with this error. The motor
speed is regulated through the monitoring of
voltage and current.
• The motor error indicates that the motor
has been drawing too much current for too
long. To remedy this, reduce the wire feed
speed or the wire feeder torque load/duty
cycle.
2
Ref. 802 687/803 154
1
Front panel is shown removed for purpose of
illustration only. In actual use, front panel
would be in place.
3
1 Wrapper
2 Motor Control Board PC1
3 LED3
4 P2
4
Display On
Meter
(If Equipped)
Indicated Error
LED3 Sequence On
Motor Control Board PC1
HELP 11
HELP 12
HELP 13
HELP 14
1 Blink
2 Blinks
3 Blinks
*4 Blinks
Communication Error
Trigger Error
Tach Error
Motor Error
*Since blink On time and blink Off time are equal in a four-blink
cycle, the four−blink sequence appears as constant blinking.