9.1 Alarm Displays
9-3
A.330
Main Circuit Power
Supply Wiring Error
• Setting of AC input/DC input is incorrect.
• Power supply wiring is incorrect.
Gr.1 Available
A.400 Overvoltage Main circuit DC voltage is excessively high. Gr.1 Available
A.410 Undervoltage Main circuit DC voltage is excessively low. Gr.2 Available
A.450
Main-Circuit
Capacitor Overvoltage
The capacitor of the main circuit has deteriorated or
is faulty.
Gr.1 N/A
A.510 Overspeed
The servomotor speed is above the maximum rota-
tional speed.
Gr.1 Available
A.511
Overspeed of Encoder Out-
put Pulse Rate
The pulse output speed upper limit of the set
encoder output pulse (Pn212) is exceeded.
Gr.1 Available
A.520 Vibration Alarm Incorrect vibration at the motor speed was detected. Gr.1 Available
A.521 Autotuning Alarm
Vibration was detected while performing tuning-less
function.
Gr.1 Available
A.710 Overload: High Load
The servomotor was operating for several seconds 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.730
A.731
Dynamic Brake Overload
When the dynamic brake was applied, rotational
energy exceeded the capacity of dynamic brake
resistor.
Gr.1 Available
A.740
Overload of Surge
Current Limit Resistor
The main circuit power was frequently turned ON
and OFF.
Gr.1 Available
A.7A0 Heat Sink Overheated The heat sink of the SERVOPACK exceeded 100°C. Gr.2 Available
A.7Ab
Built-in Fan in
SERVOPACK Stopped
The fan inside the SERVOPACK stopped. Gr.1 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 incor-
rect.
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.8A0 External Encoder Error External encoder is faulty. Gr.1 Available
A.8A1
External Encoder Error of
Module
Serial converter unit is faulty. Gr.1 Available
A.8A2
External Encoder Error of
Sensor
External encoder is faulty. Gr.1 Available
A.8A3
External Encoder Error of
Position
The position data of external encoder is faulty. Gr.1 Available
A.8A5
External Encoder Over-
speed
The overspeed from the external encoder occurred. Gr.1 Available
A.8A6
External Encoder Overheat-
ed
The overheat from the external encoder occurred. Gr.1 Available
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
(cont’d)
Alarm
Number
Alarm Name Meaning
Servo-
motor
Stopping
Method
Alarm
Reset
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