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Alarm Number:
Possible Cause
Alarm Name
There is a short-circuit
or ground fault in a
Main Circuit Cable.
There is a short-circuit
or ground fault inside
the Servomotor.
There is a short-circuit
or ground fault inside
the SERVOPACK.
The regenerative
resistor is not wired
correctly or there is
faulty contact.
The dynamic brake
(DB, emergency stop
executed from the
SERVOPACK) was
A.100:
frequently activated,
Overcurrent
or a DB overload
Detected
alarm occurred.
(An overcurrent
flowed through
the power tran-
sistor or the heat
The regenerative pro-
sink overheated.)
cessing capacity was
exceeded.
The SERVOPACK
regenerative resis-
tance is too small.
A heavy load was
applied while the Ser-
vomotor was stopped
or running at a low
speed.
A malfunction was
caused by noise.
A failure occurred in
the SERVOPACK.
Confirmation
Check for short-circuits
across Servomotor
The cable may be short-
phases U, V, and W, or
circuited. Replace the
between the ground and
cable.
Servomotor phases U, V,
and W.
Check for short-circuits
across Servomotor
The Servomotor may be
phases U, V, and W, or
faulty. Replace the Servo-
between the ground and
motor.
Servomotor phases U, V,
or W.
Check for short-circuits
across the Servomotor
connection terminals U, V,
The SERVOPACK may be
and W on the SERVO-
faulty. Replace the SER-
PACK, or between the
VOPACK.
ground and terminals U,
V, or W.
Check the wiring.
Check the power con-
sumed by the DB resistor
Change the SERVOPACK
to see how frequently the
model, operating meth-
DB is being used. Or,
ods, or the mechanisms
check the alarm display to
so that the dynamic brake
see if a DB overload alarm
does not need to be used
(A.730 or A.731) has
so frequently.
occurred.
Check the regenerative
load ratio in the Sig-
maWin+ Motion Monitor
Recheck the operating
Tab Page to see how fre-
conditions and load.
quently the regenerative
resistor is being used.
Check the regenerative
Change the regenerative
load ratio in the Sig-
resistance to a value
maWin+ Motion Monitor
larger than the SERVO-
Tab Page to see how fre-
PACK minimum allowable
quently the regenerative
resistance.
resistor is being used.
Check to see if the oper-
Reduce the load applied
ating conditions exceed
to the Servomotor. Or,
Servo Drive specifica-
increase the operating
tions.
speed.
Implement countermea-
Improve the noise envi-
sures against noise, such
ronment, e.g. by improv-
as correct wiring of the
ing the wiring or
FG. Use an FG wire size
installation conditions,
equivalent to the SERVO-
and check to see if the
PACK's main circuit wire
alarm still occurs.
size.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
–
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
5.3 Troubleshooting Alarms
Continued from previous page.
Correction
*1
*1
*1
*1
Correct the wiring.
–
*4
*4
–
–
–
Continued on next page.
Refer-
ence
5
5-11
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Table of Contents
Troubleshooting
