10 Maintenance, Inspections, and Troubleshooting
10.2.2 Troubleshooting of Alarms
10-10
A.840:
Encoder Data Error
(Detected on the
encoder side.)
An encoder malfunctioned. −
Restart the SERVOPACK. If the
alarm still occurs, the servomotor
may be faulty. Replace the servo-
motor.
Malfunction of encoder because
of noise interference, etc.
−
Correct the wiring around the
encoder (e.g., grounding).
A.850:
Encoder Overspeed
(Detected when the
control 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 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.860:
Encoder Overheated
(Only when an
absolute encoder is
connected.)
(Detected on the
encoder side.)
The surrounding air temperature
around the servomotor is too
high.
Measure the surrounding air tem-
perature around the servomotor.
The surrounding air temperature
must be 40°C or less.
The motor load is greater than the
rated load.
Check the accumulated load ratio 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.b31:
Current Detection
Error 1
The servomotor/encoder relay
cable is disconnected.
Check the servomotor/encoder relay
cable.
Correct the motor wiring.
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 servomotor/encoder relay
cable is disconnected.
Check the servomotor/encoder relay
cable.
Correct the motor wiring.
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 servomotor/encoder relay
cable is disconnected.
Check the servomotor/encoder relay
cable.
Correct the servomotor wiring.
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.
A.b6A:
MECHATROLINK
Communications ASIC
Error 1
SERVOPACK MECHA-
TROLINK communication sec-
tion fault.
−
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
A.b6b:
MECHATROLINK
Communications ASIC
Error 2
MECHATROLINK data recep-
tion error occurred due to noise
interference.
−
Take measures against noise. Check
the MECHATROLINK communi-
cations cable and FG wiring and
take measures such as adding ferrite
core on the MECHATROLINK
communications cable.
SERVOPACK MECHA-
TROLINK communication sec-
tion fault.
−
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
A.bF0:
System Alarm 0
A SERVOPACK fault occurred. −
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause Investigative Actions Corrective Actions
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