12.2 Alarm Displays
12.2.2 Troubleshooting Alarms
12-16
A.100:
Overcurrent
Detected
(An overcurrent
flowed through
the power tran-
sistor or the heat
sink overheated.)
The dynamic brake
(DB, emergency stop
executed from the
SERVOPACK) was
frequently activated,
or a DB overload
alarm occurred.
Check the power con-
sumed by the DB resis-
tor to see how
frequently the DB is
being used. Or, check
the alarm display to see
if a DB overload alarm
(A.730 or A.731) has
occurred.
Change the SERVOPACK
model, operating meth-
ods, or the mechanisms
so that the dynamic brake
does not need to be used
so frequently.
–
The regenerative pro-
cessing capacity was
exceeded.
Check the regenerative
load ratio in the Sig-
maWin+ Motion Monitor
Tab Page to see how
frequently the regenera-
tive resistor is being
used.
Recheck the operating
conditions and load.
*3
The SERVOPACK
regenerative resis-
tance is too small.
Check the regenerative
load ratio in the Sig-
maWin+ Motion Monitor
Tab Page to see how
frequently the regenera-
tive resistor is being
used.
Change the regenerative
resistance to a value
larger than the SERVO-
PACK minimum allowable
resistance.
A heavy load was
applied while the Ser-
vomotor was stopped
or running at a low
speed.
Check to see if the
operating conditions
exceed Servo Drive
specifications.
Reduce the load applied
to the Servomotor. Or,
increase the operating
speed.
–
A malfunction was
caused by noise.
Improve the noise envi-
ronment, e.g. by
improving the wiring or
installation conditions,
and check to see if the
alarm still occurs.
Implement countermea-
sures against noise, such
as correct wiring of the
FG. Use an FG wire size
equivalent to the SERVO-
PACK’s main circuit wire
size.
–
A failure occurred in
the SERVOPACK.
–
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
–
Continued on next page.
Continued from previous page.
Alarm Number:
Alarm Name
Possible Cause Confirmation Correction Reference
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