10 Maintenance, Inspections, and Troubleshooting
10.2.1 List of Alarms
10-4
A.521 Autotuning Alarm
Vibration was detected while performing tun-
ing-less function.
Gr.1 Available
A.710 Overload: High Load
The servomotor was operating for several sec-
onds to several tens of seconds under a torque
largely exceeding ratings.
Gr.2 Available
A.720 Overload: Low Load
The servomotor was operating continuously
under a torque exceeding ratings.
Gr.1 Available
A.7A3 Control Board Overheat
The temperature of the control board exceeded
95°C.
Gr.2 Available
A.810 Encoder Backup Error
The power supplies to the encoder all failed and
position data was lost.
Gr.1 N/A
A.820 Encoder Checksum Error
The checksum results of encoder memory is
incorrect.
Gr.1 N/A
A.830
Absolute Encoder Battery
Error
The battery voltage was lower than the specified
value after the control power supply was turned
ON.
Gr.1 Available
A.840 Encoder Data Error Data in the encoder is incorrect. Gr.1 N/A
A.850 Encoder Overspeed
The encoder was rotating at high speed when
the power was turned ON.
Gr.1 N/A
A.860 Encoder Overheated The internal temperature of encoder is too high. Gr.1 N/A
A.b31 Current Detection Error 1
The current detection circuit for phase U is
faulty.
Gr.1 N/A
A.b32 Current Detection Error 2
The current detection circuit for phase V is
faulty.
Gr.1 N/A
A.b33 Current Detection Error 3 The detection circuit for the current is faulty. Gr.1 N/A
A.b6A
MECHATROLINK
Communications
ASIC Error 1
ASIC error occurred in the MECHATROLINK
communications.
Gr.1 N/A
A.b6b
MECHATROLINK
Communications
ASIC Error 2
ASIC error occurred in the MECHATROLINK
communications.
Gr.2 N/A
A.bF0 System Alarm 0
"Internal program error 0" of the SERVOPACK
occurred.
Gr.1 N/A
A.bF1 System Alarm 1
"Internal program error 1" of the SERVOPACK
occurred.
Gr.1 N/A
A.bF2 System Alarm 2
"Internal program error 2" of the SERVOPACK
occurred.
Gr.1 N/A
A.bF3 System Alarm 3
"Internal program error 3" of the SERVOPACK
occurred.
Gr.1 N/A
A.bF4 System Alarm 4
"Internal program error 4" of the SERVOPACK
occurred.
Gr.1 N/A
A.C10 Servo Overrun Detected The servomotor ran out of control. Gr.1 Available
A.C80
Absolute Encoder Clear Error
and Multiturn Limit Setting
Error
The multiturn for the absolute encoder was not
properly cleared or set.
Gr.1 N/A
A.C90
Encoder Communications
Error
Communications between the SERVOPACK
and the encoder is not possible.
Gr.1 N/A
A.C91
Encoder Communications
Position Data Error
An encoder position data calculation error
occurred.
Gr.1 N/A
A.C92
Encoder Communications
Timer Error
An error occurs in the communications timer
between the encoder and the SERVOPACK.
Gr.1 N/A
A.CA0 Encoder Parameter Error Encoder parameters are faulty. Gr.1 N/A
(cont’d)
Alarm
Number
Alarm Name Meaning
Servo-
motor
Stopping
Method
Alarm
Reset
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