YASKAWA SGDH User Manual page 550

10 Inspection, Maintenance, and Troubleshooting
10.1.6 Troubleshooting of Alarm and Warning
Alarm
Alarm Name
Display
A.41
∗
1
Undervoltage
(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.)
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.)
A.71
A.71: High Load
A.72: Low Load
A.72
Table 10.6 Alarm Display and Troubleshooting (Cont'd)
Situation at Alarm
Occurrence
Occurred when the A SERVOPACK board fault occurred.
control power sup-
ply was turned ON.
Occurred when the The AC power supply voltage is low.
main circuit power
supply was turned
The fuse of the SERVOPACK is blown out.
ON.
The surge current limit resistor is disconnected,
resulting in an abnormal power supply voltage or in
an overload of the surge current limit resistor.
A SERVOPACK fault occurred.
Occurred during The AC power supply voltage was lowered, and
normal operation. large voltage drop occurred.
A temporary power failure occurred.
The servomotor main circuit cable is short-circuited.
The servomotor is short-circuited.
A SERVOPACK fault occurred.
Occurred when the A SERVOPACK board fault occurred.
control power sup-
ply was turned ON.
Occurred when The order of phases U, V, and W in the servomotor
servo was ON. wiring is incorrect.
The encoder wiring is incorrect.
Malfunction occurred due to noise interference in
the encoder wiring.
A SERVOPACK fault occurred.
Occurred when the The order of phases U, V, and W in the servomotor
servomotor started wiring is incorrect.
running or in a
The encoder wiring is incorrect.
high-speed rotation.
Malfunction occurred due to noise interference in
the encoder wiring.
The position or speed reference input is too large.
The setting of the reference input gain is incorrect.
A SERVOPACK board fault occurred.
Occurred when the A SERVOPACK board fault occurred.
control power sup-
ply was turned ON.
Occurred when the The servomotor wiring is incorrect or the connection
servo was ON. is faulty.
The encoder wiring is incorrect or the connection is
faulty.
A SERVOPACK fault occurred.
Occurred when the The servomotor wiring is incorrect or the connection
servomotor did not is faulty.
run by the refer-
The encoder wiring is incorrect or the connection is
ence input.
faulty.
The starting torque exceeds the maximum torque.
A SERVOPACK fault occurred.
Occurred during The actual torque exceeds the rated torque or the
normal operation. starting torque largely exceeds the rated torque.
Temperature in the SERVOPACK panel is high.
A SERVOPACK fault occurred.
Cause
10-10
Corrective Actions
Replace the SERVOPACK.
The AC power supply voltage must be within the
specified range.
Replace the SERVOPACK.
Replace the SERVOPACK. Check the power sup-
ply voltage, and reduce the number of times that
the main circuit is turned ON or OFF.)
Replace the SERVOPACK.
The AC power supply voltage must be within the
specified range.
Clear and reset the alarm, and restart the opera-
tion.
Repair or replace the servomotor main circuit
cable.
Replace the servomotor.
Replace the SERVOPACK.
Replace the SERVOPACK.
Correct the servomotor wiring.
Correct the encoder wiring.
Take measures against noise for the encoder wir-
ing.
Replace the SERVOPACK.
Correct the servomotor wiring.
Correct the encoder wiring.
Take measures against noise for the encoder wir-
ing.
Reduce the reference value.
Correct the reference input gain setting.
Replace the SERVOPACK.
Replace the SERVOPACK.
Correct the servomotor wiring.
Correct the encoder wiring.
Replace the SERVOPACK.
Correct the servomotor wiring.
Correct the encoder wiring.
Reconsider the load and operation conditions, or
reconsider the servomotor capacity.
Replace the SERVOPACK.
Reconsider the load and operation conditions, or
reconsider the servomotor capacity.
Reduce the in-panel temperature to 55
Replace the SERVOPACK.
°
or less.