(cont’d)
Alarm
Display
Alarm Name Meaning
Servo-
motor
Stop
Method
Alarm
Reset
Alarm Code Output
ALO1 ALO2 ALO3
A.300 Regeneration Error
Regenerative circuit or regenerative resistor
is faulty.
Gr.1 Available
LLH
A.320 Regenerative Overload
Regenerative energy exceeds regenerative
resistor capacity.
Gr.2 Available
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
HHL
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 deteri-
orated or is faulty.
Gr.1 N/A
A.510 Overspeed The servomotor speed is excessively high. Gr.1 Available
LHL
A.511
Overspeed of Encoder
Output Pulse Rate
The motor speed upper limit of the set
encoder output pulse (pulse unit) (Pn212) is
exceeded.
Gr.1 Available
A.520 Vibration Alarm 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 motor was operating for several sec-
onds to several tens of seconds under a
torque largely exceeding ratings.
Gr.2 Available
LLL
A.720 Overload: Low Load
The motor was operating continuously
under a torque largely exceeding ratings.
Gr.1 Available
A.730
A.731
Dynamic Brake Overload
When the dynamic brake was applied, rota-
tional 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
All the power supplies for the absolute
encoder have failed and position data was
cleared.
Gr.1 N/A
HHH
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 while monitoring 4 seconds
after the ALM signal outputs max. 5 sec-
onds when the control power supply is
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 of
Scale
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 of external encoder is faulty. Gr.1 Available
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