11.1 Troubleshooting
11-9
11
A.41
Undervoltage
∗
1
(Detected when
the
SERVOPACK’s
main circuit DC
voltage is 170 V
or less.)
(Detected when
the power to the
main circuit is
turned ON.)
Occurred when the
control power sup-
ply was turned ON.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
Occurred when the
main circuit power
supply was turned
ON.
The AC power supply voltage is low.
The AC power supply voltage must be within the
specified range.
The fuse of the SERVOPACK is blown out. Replace the SERVOPACK.
The surge current limit resistor is disconnected,
resulting in an abnormal power supply voltage or in
an overload of the surge current limit resistor.
Replace the SERVOPACK. Check the power sup-
ply voltage, and reduce the number of times that
the main circuit is turned ON or OFF.)
A SERVOPACK fault occurred. Replace the SERVOPACK.
Occurred during
normal operation.
The AC power supply voltage was lowered, and
large voltage drop occurred.
The AC power supply voltage must be within the
specified range.
A temporary power failure occurred.
Clear and reset the alarm, and restart the opera-
tion.
The servomotor main circuit cable is short-circuited.
Repair or replace the servomotor main circuit
cable.
The servomotor is short-circuited. Replace the servomotor.
A SERVOPACK fault occurred. Replace the SERVOPACK.
A.51
Overspeed
(Detected when
the feedback
speed is the max-
imum motor
speed × 1.2 or
more for the
SGMGH servo-
motor, and × 1.1
or more for the
other servomo-
tors.)
Occurred when the
control power sup-
ply was turned ON.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
Occurred when
servo was ON.
The order of phases U, V, and W in the servomotor
wiring is incorrect.
Correct the servomotor wiring.
The encoder wiring is incorrect. Correct the encoder wiring.
Malfunction occurred due to noise interference in
the encoder wiring.
Take measures against noise for the encoder wir-
ing.
A SERVOPACK fault occurred. Replace the SERVOPACK.
Occurred when the
servomotor started
running or in a
high-speed rotation.
The order of phases U, V, and W in the servomotor
wiring is incorrect.
Correct the servomotor wiring.
The encoder wiring is incorrect. Correct the encoder wiring.
Malfunction occurred due to noise interference in
the encoder wiring.
Take measures against noise for the encoder wir-
ing.
The position or speed reference input is too large. Reduce the reference value.
The setting of the reference input gain is incorrect. Correct the reference input gain setting.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
A.71
A.72
A.71: High Load
A.72: Low Load
Occurred when the
control power sup-
ply was turned ON.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
Occurred when the
servo was ON.
The servomotor wiring is incorrect or the connection
is faulty.
Correct the servomotor wiring.
The encoder wiring is incorrect or the connection is
faulty.
Correct the encoder wiring.
A SERVOPACK fault occurred. Replace the SERVOPACK.
Occurred when the
servomotor did not
run by the refer-
ence input.
The servomotor wiring is incorrect or the connection
is faulty.
Correct the servomotor wiring.
The encoder wiring is incorrect or the connection is
faulty.
Correct the encoder wiring.
The starting torque exceeds the maximum torque.
Reconsider the load and operation conditions, or
reconsider the servomotor capacity.
A SERVOPACK fault occurred. Replace the SERVOPACK.
Occurred during
normal operation.
The actual torque exceeds the rated torque or the
starting torque largely exceeds the rated torque.
Reconsider the load and operation conditions, or
reconsider the servomotor capacity.
Temperature in the SERVOPACK panel is high.
Reduce the in-panel temperature to 55° or less.
A SERVOPACK fault occurred. Replace the SERVOPACK.
Table 11.3 Alarm Display and Troubleshooting (Cont’d)
Alarm
Display
Alarm Name
Situation at Alarm
Occurrence
Cause Corrective Actions
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