12.2 Alarm Displays
12.2.1 List of Alarms
12-7
A.511
Encoder Output Pulse
Overspeed
• Rotary Servomotor: The
pulse output speed for the
setting of Pn212 (Number
of Encoder Output Pulses)
was exceeded.
• Linear Servomotor: The
motor speed upper limit for
the setting of Pn281
(Encoder Output Resolu-
tion) was exceeded.
Gr.1 Yes L H L
A.520 Vibration Alarm
Abnormal oscillation was
detected in the motor speed.
Gr.1 Yes L H L
A.521 Autotuning Alarm
Vibration was detected
during autotuning for the tun-
ing-less function.
Gr.1 Yes L H L
A.550
Maximum Speed Setting
Error
The setting of Pn385 (Maxi-
mum Motor Speed) is greater
than the maximum motor
speed.
Gr.1 Yes L H L
A.710 Instantaneous Overload
The Servomotor was operat-
ing for several seconds to
several tens of seconds
under a torque that largely
exceeded the rating.
Gr.2 Yes LLL
A.720 Continuous Overload
The Servomotor was operat-
ing continuously under a
torque that exceeded the rat-
ing.
Gr.1 Yes LLL
A.730
Dynamic Brake Overload
When the dynamic brake was
applied, the rotational or lin-
ear kinetic energy exceeded
the capacity of the dynamic
brake resistor.
Gr.1 Yes LLL
A.731
A.740
Inrush Current Limiting
Resistor Overload
The main circuit power sup-
ply was frequently turned ON
and OFF.
Gr.1 Yes LLL
A.7A1
Internal Temperature Error
1 (Control Board Tempera-
ture Error)
The surrounding tempera-
ture of the control PCB is
abnormal.
Gr.2 Yes LLL
A.7A2
Internal Temperature Error
2 (Power Board Tempera-
ture Error)
The surrounding tempera-
ture of the power PCB is
abnormal.
Gr.2 Yes LLL
A.7A3
Internal Temperature Sen-
sor Error
An error occurred in the tem-
perature sensor circuit.
Gr.2 No LLL
A.7Ab
SERVOPACK Built-in Fan
Stopped
The fan inside the SERVO-
PACK stopped.
Gr.1 Yes LLL
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 H H H
A.830 Encoder Battery Alarm
The battery voltage was
lower than the specified level
after the control power sup-
ply was turned ON.
Gr.1 Yes H H H
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
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