9.1 Alarm Displays
9-3
A.150
Motor Winding Current Un-
balance
The currents in the motor windings are not
correct.
Gr.1 Available
A.300
Regeneration Error
Regenerative circuit or regenerative resis-
tor is faulty.
Gr.1 Available L L H
A.320
Regenerative Overload
Regenerative energy exceeds regenerative
resistor capacity.
Gr.2 Available L L H
A.330*
Main Circuit Power
Supply Wiring Error
• Setting of AC input/DC input is incor-
rect.
• Power supply wiring is incorrect.
Gr.1 Available L L H
A.400*
Overvoltage
Main circuit DC voltage is excessively
high.
Gr.1 Available H H L
A.410*
Undervoltage
Main circuit DC voltage is excessively
low.
Gr.2 Available H H L
A.42A
Converter error
One of the following was detected by the
converter.
• An operation error occurred when using
the limit relay for inrush current
• PN voltage error
• Regeneration operation error
• The converter’s heat sink overheated
• An operation error occurred when using
the converter and fan
Gr.1 Available H H L
A.450*
Main-Circuit
Capacitor Overvoltage
The capacitor of the main circuit has dete-
riorated or is faulty.
Gr.1 N/A H H L
A.510
Overspeed
The servomotor speed is above the maxi-
mum rotational speed.
Gr.1 Available L H L
A.511
Overspeed of Encoder
Output Pulse Rate
The pulse output speed upper limit of the
set encoder output pulse (Pn212) is
exceeded.
Gr.1 Available L H L
A.520
Vibration Alarm
Incorrect vibration at the motor speed was
detected.
Gr.1 Available L H L
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 L L L
A.720
Overload: Low Load
The servomotor was operating continu-
ously under a torque exceeding ratings.
Gr.1 Available L L L
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 L L L
A.740*
Overload of Surge
Current Limit Resistor
The main circuit power was frequently
turned ON and OFF.
Gr.1 Available L L L
A.7A0*
Heat Sink Overheated
The heat sink of the SERVOPACK or con-
verter exceeded 100
°
C.
Gr.2 Available L L L
A.7Ab*
Built-in Fan in
SERVOPACK Stopped
The fan inside the SERVOPACK stopped. Gr.1 Available L L L
A.810
Encoder Backup Error
The power supplies to the encoder all
failed and position data was lost.
Gr.1 N/A H H H
A.820
Encoder Checksum Error
The checksum results of encoder memory
is incorrect.
Gr.1 N/A H H H
A.830
Absolute Encoder Battery
Error
The battery voltage was lower than the
specified value after the control power
supply was turned ON.
Gr.1AvailableHHH
A.840
Encoder Data Error
Data in the encoder is incorrect. Gr.1 N/A H H H
A.850
Encoder Overspeed
The encoder was rotating at high speed
when the power was turned ON.
Gr.1 N/A H H H
(cont’d)
Alarm
Number
Alarm Name Meaning
Servomotor
Stopping
Method
Alarm
Reset
Alarm Code Output
ALO1 ALO2 ALO3
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