Diagnostics - Miller Electric D-75D Owner's Manual

7-3. Diagnostics

3
Left Side Motor Control
Board PC101
Right Side Motor Control
Board PC1
Dual Board PC70
Error Indications
Error conditions are indicated by LED3 on
PC1, PC101, PC70 or on display if meter op-
tion is present. To view LED3, turn Off unit, re-
move 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
OM-228 322 Page 24
1
Display On
Optional Meter
HELP 11
HELP 12
HELP 13
HELP 14
HELP 21
HELP 22
HELP 23
HELP 24
HELP 31
*Since blink On time and blink Off time are equal in a four-blink
cycle, the four−blink sequence appears as constant blinking.
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 or
Dual 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-
2
LED3 Sequence
1 Blink
2 Blinks
3 Blinks
*4 Blinks
1 Blink
2 Blinks
3 Blinks
*4 Blinks
*4 Blinks
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.
1 LED3 On Right Side Motor
Control Board PC1
2 LED3 On Left Side Motor
Control Board PC101
3 LED3 On Dual Board PC70
803 063-A
Indicated Error
Communication Error
Trigger Error
Tach Error
Motor Error
Communication Error
Trigger Error
Tach Error
Motor Error
Communication Error