15.2 Alarm Displays
15.2.1 List of Alarms
15-7
15
Maintenance
A.400
Overvoltage
The main circuit DC voltage is too high.
Gr.1
Yes
H
H
L
A.410
Undervoltage
The main circuit DC voltage is too low.
Gr.2
Yes
A.510
Overspeed
The motor exceeded the maximum
speed.
Gr.1
Yes
L
H
L
A.511
Encoder Output Pulse
Overspeed
•
Rotary Servomotor: The pulse output
speed for the setting of Pn212 (Encoder
Output Pulses) was exceeded.
•
Linear Servomotor: The motor speed
upper limit for the setting of Pn281
(Encoder Output Resolution) was
exceeded.
Gr.1
Yes
A.520
Vibration Alarm
Abnormal oscillation was detected in the
motor speed.
Gr.1
Yes
A.521
Autotuning Alarm
Vibration was detected during autotuning
for the tuning-less function.
Gr.1
Yes
A.550
Maximum Speed Set-
ting Error
The setting of Pn385 (Maximum Motor
Speed) is greater than the maximum
motor speed.
Gr.1
Yes
A.710
Instantaneous Over-
load
The Servomotor was operating for several
seconds to several tens of seconds under
a torque that largely exceeded the rating.
Gr.2
Yes
L
L
L
A.720
Continuous Overload
The Servomotor was operating continu-
ously under a torque that exceeded the
rating.
Gr.1
Yes
A.730
Dynamic Brake Over-
load
When the dynamic brake was applied,
the rotational or linear kinetic energy
exceeded the capacity of the dynamic
brake resistor.
Gr.1
Yes
A.731
A.740
Inrush Current Limit-
ing Resistor Overload
The main circuit power supply was fre-
quently turned ON and OFF.
Gr.1
Yes
A.7A1
Internal Temperature
Error 1 (Control Board
Temperature Error)
The surrounding temperature of the con-
trol PCB is abnormal.
Gr.2
Yes
A.7A2
Internal Temperature
Error 2 (Power Board
Temperature Error)
The surrounding temperature of the
power PCB is abnormal.
Gr.2
Yes
A.7A3
Internal Temperature
Sensor Error
An error occurred in the temperature sen-
sor circuit.
Gr.2
No
A.7Ab
SERVOPACK Built-in
Fan Stopped
The fan inside the SERVOPACK stopped.
Gr.1
Yes
A.810
Encoder Backup
Alarm
The power supplies to the encoder all
failed and the position data was lost.
Gr.1
No
H
H
H
A.820
Encoder Checksum
Alarm
There is an error in the checksum results
for encoder memory.
Gr.1
No
A.830
Encoder Battery
Alarm
The battery voltage was lower than the
specified level after the control power
supply was turned ON.
Gr.1
Yes
A.840
Encoder Data Alarm
There is an internal data error in the
encoder.
Gr.1
No
A.850
Encoder Overspeed
The encoder was operating at high speed
when the power was turned ON.
Gr.1
No
A.860
Encoder Overheated
The internal temperature of encoder is
too high.
Gr.1
No
Continued on next page.
Continued from previous page.
Alarm
Number
Alarm Name
Alarm Meaning
Servo-
motor
Stop-
ping
Method
Alarm
Reset
Possi-
ble?
Alarm Code Output
/ALO1 /ALO2 /ALO3