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Alarm Number:
Possible Cause
Alarm Name
The cable between
the Serial Converter
Unit and SERVOPACK
is not wired correctly
or there is a faulty
contact.
A specified cable is
not being used
A.CF1:
between Serial Con-
Reception Failed
verter Unit and SER-
Error in Feed-
VOPACK.
back Option
Module Commu-
The cable between
nications
the Serial Converter
Unit and SERVOPACK
is too long.
The sheath on cable
between the Serial
Converter Unit and
SERVOPACK is bro-
ken.
Noise entered the
cable between the
A.CF2:
Serial Converter Unit
Timer Stopped
and SERVOPACK.
Error in Feed-
A failure occurred in
back Option
the Serial Converter
Module Commu-
Unit.
nications
A failure occurred in
the SERVOPACK.
The Servomotor U, V,
and W wiring is not
correct.
The position com-
mand speed is too
fast.
A.d00:
Position Devia-
tion Overflow
The acceleration of
(The setting of
the position reference
Pn520 (Position
is too high.
Deviation Over-
flow Alarm Level)
was exceeded by
the position devi-
ation while the
The setting of Pn520
servo was ON.)
(Position Deviation
Overflow Alarm Level)
is too low for the
operating conditions.
A failure occurred in
the SERVOPACK.
Confirmation
Correctly wire the cable
Check the wiring of the
between the Serial Con-
external encoder.
verter Unit and SERVO-
PACK.
Check the wiring specifi-
cations of the external
Use a specified cable.
encoder.
The length of the cable
Measure the length of the
between the Serial Con-
cable that connects the
verter Unit and SERVO-
Serial Converter Unit.
PACK must be 20 m or
less.
Replace the cable
Check the cable that con-
between the Serial Con-
nects the Serial Con-
verter Unit and SERVO-
verter Unit.
PACK.
Correct the wiring around
the Serial Converter Unit,
–
e.g., separate I/O signal
lines from the Main Circuit
Cables or ground.
Replace the Serial Con-
–
verter Unit.
Replace the SERVO-
–
PACK.
Make sure that there are
Check the wiring of the
no faulty contacts in the
Servomotor's Main Cir-
wiring for the Servomotor
cuit Cables.
and encoder.
Reduce the position refer-
Reduce the position com-
ence speed or the refer-
mand speed and try oper-
ence acceleration rate, or
ating the SERVOPACK.
reconsider the electronic
gear ratio.
Reduce the acceleration
of the position reference
using a MECHATROLINK
Reduce the reference
command. Or, smooth the
acceleration and try oper-
position reference accel-
ating the SERVOPACK.
eration by selecting the
position reference filter
(ACCFIL) using a MECHA-
TROLINK command.
Check Pn520 (Position
Deviation Overflow Alarm
Optimize the setting of
Level) to see if it is set to
Pn520.
an appropriate value.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
–
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
5.3 Troubleshooting Alarms
Continued from previous page.
Refer-
Correction
ence
*1
–
–
–
–
–
–
–
*1
–
*1
–
Continued on next page.
5
5-31
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Table of Contents
Troubleshooting
