5.3 Troubleshooting Alarms
5
Maintenance
5-11
A.100:
Overcurrent
Detected
(An overcurrent
flowed through
the power trans-
former or the heat
sink overheated.)
The Main Circuit
Cable is not wired
correctly or there is
faulty contact.
Check the wiring.
Correct the wiring.
*1
There is a short-circuit
or ground fault in a
Main Circuit Cable.
Check for short-circuits
across Servomotor
phases U, V, and W, or
between the ground
and Servomotor phases
U, V, and W.
The cable may be short-
circuited. Replace the
cable.
There is a short-circuit
or ground fault inside
the Servomotor.
Check for short-circuits
across Servomotor
phases U, V, and W, or
between the ground
and Servomotor phases
U, V, or W.
The Servomotor may be
faulty. Replace the Servo-
motor.
There is a short-circuit
or ground fault inside
the SERVOPACK.
Check for short-circuits
across the Servomotor
connection terminals U,
V, and W on the SER-
VOPACK, or between
the ground and termi-
nals U, V, or W.
The SERVOPACK may be
faulty. Replace the SER-
VOPACK.
The regenerative
resistor is not wired
correctly or there is
faulty contact.
Check the wiring.
Correct the wiring.
*1
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.
*4
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.
Continued on next page.
Continued from previous page.
Alarm Number:
Alarm Name
Possible Cause
Confirmation
Correction
Reference
