Alarm Number: Alarm
Name (Alarm Description)
Cause
Investigative Actions
Corrective Actions
The specified cable is not
used or the cable is too
long.
Confirm the external
encoder wiring specifica-
tions.
Use the specified cable with
max. 20 m length.
A.CF2: Timer Stopped Error
in Feedback Option Module
Communications
Noise interferes with the
cable between encoder unit
and SERVOPACK.
-
Correct the wiring around
the feedback option module
or serial converter unit, e.g.
by separating the input/
output signal line from the
main circuit cable or by
grounding.
A.D10: Motor-Load Position
Deviation Overflow
Motor rotation direction and
external encoder installation
direction are opposite.
Check the servomotor rota-
tion direction and the
external encoder installation
direction.
Install the external encoder
in the opposite direction, or
reverse the setting of the
external encoder usage
method (Pn002.3).
Mounting of the load (e.g.,
stage) and external encoder
joint installation are incor-
rect.
Check the external encoder
mechanical connection
Check the mechanical
joints.
14.4 Errors in Semi-closed Loop Control with Rotary Motors
Alarm Number: Alarm
Name (Alarm Description)
Cause
Investigative Actions
Corrective Actions
A.041: Encoder Output
Pulse Setting Error
The setting of Pn212
(Encoder Output Pulses) is
outside of the setting range
or does not satisfy the set-
ting conditions.
Check the parameter
Pn212.
Set Pn212 to a correct
value.
A.511: Encoder Output
Pulse Overspeed
n
Rotary Servomotor: The
pulse output speed for
the setting of Pn212
(Encoder Output Pulses)
was exceeded.
Check the encoder output
pulse output setting.
Decrease the setting of the
encoder output pulse
(Pn212).
A.810: Encoder Backup
Alarm
The power supplies to the
encoder all failed and the
position data was lost.
Check the encoder con-
nector battery or the con-
nector contact status.
Replace the battery or take
similar measures to supply
power to the encoder, and
set up the encoder (Fn008).
A.820: Encoder Checksum
Alarm
No signal from encoder
detected.
-
Set up the encoder again
using Fn008. If the alarm
still occurs, the servomotor
may be faulty. Replace the
servomotor.
A SERVOPACK fault
occurred.
-
The SERVOPACK may be
faulty. Replace the SERVO-
PACK.
Wiring incorrect or one
signal is missing.
-
Recheck the wiring.
Noise
-
Connect shield properly as
recommended.
Sigma-5 and Sigma-7 Series SERVOPACKs
Error Lists
Errors in Semi-closed Loop Control with Rotary Motors
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