Yaskawa Σ-V Series AC Servo Drives Rotational Motor Analog Voltage Reference - Manual (Page 269)

9 Troubleshooting
9.1.2 Troubleshooting of Alarms
9-10
A.850:
Encoder Overspeed
(Detected when the con-
trol power supply was
turned ON.)
(Detected on the encoder
side.)
The servomotor speed is higher
than 200 min
-1 when the control
power supply was turned ON.
Check the motor rotating speed
(Un000) to confirm the servomotor
speed when the power is turned ON.
Reduce the servomotor speed to a
value less than 200 min
-1 , and turn
ON the control power supply.
An encoder fault occurred. −
Restart the SERVOPACK. If the
alarm still occurs, the servomotor
may be faulty. Replace the servo-
motor.
A SERVOPACK fault occurred. −
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
A.860:
Encoder Overheated
(Only when an absolute
encoder is connected.)
(Detected on the encoder
side.)
The ambient operating tempera-
ture around the servomotor is too
high.
Measure the ambient operating tem-
perature around the servomotor.
The ambient operating temperature
must be 40 ° C or less.
The motor load is greater than the
rated load.
Check the accumulated load ratio
(Un009) to see the load.
The motor load must be within the
specified range.
An encoder fault occurred. −
Restart the SERVOPACK. If the
alarm still occurs, the servomotor
may be faulty. Replace the servo-
motor.
A SERVOPACK fault occurred. −
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
A.b10 *3 :
Speed Reference A/D
Error
(Detected when the
servo is ON.)
A malfunction occurred in the
speed reference input section.
−
Clear and reset the alarm and restart
the operation.
A SERVOPACK fault occurred. −
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
A.b11 *3 :
Speed Reference A/D
Data Error
A malfunction occurred in the
speed reference input section.
−
Clear and reset the alarm and restart
the operation.
A SERVOPACK fault occurred. −
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
A.b20 *3 :
Reference Torque
Input Read Error
(Detected when the
servo is ON.)
A malfunction occurred in the
reading section of the torque ref-
erence input.
−
Clear and reset the alarm and restart
the operation.
A SERVOPACK fault occurred. −
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
A.b31:
Current Detection
Error 1
The current detection circuit for
phase U is faulty.
−
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
A.b32:
Current Detection
Error 2
The current detection circuit for
phase V is faulty.
−
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
A.b33:
Current Detection
Error 3
The detection circuit for the cur-
rent is faulty.
−
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
The servomotor main circuit
cable is disconnected. Check for disconnection of the ser-
vomotor main circuit cable.
Correct the servomotor wiring.
∗3. This alarm will occur only for a SERVOPACK for analog voltage references.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause Investigative Actions Corrective Actions