10.1 Alarm Displays
10-19
10
Trou
blesh
ooting
A.CF1:
Feedback Option
Module
Communications Error
(Reception error)
Wiring of cable between serial
converter unit and SERVOPACK
is incorrect or contact is faulty.
Check the external encoder wiring.
Correct the cable wiring.
The specified cable is not used
between serial converter unit and
SERVOPACK.
Confirm the external encoder wir-
ing specifications.
Use the specified cable.
Cable between serial converter
unit and SERVOPACK is too
long.
Measure the length of this cable.
Use 20-m cable max.
Sheath of cable between serial
converter unit and SERVOPACK
is broken.
Check the cable for damage.
Replace the cable.
A.CF2:
Feedback Option
Module
Communications Error
(Timer stop)
Noise interferes with the cable
between serial converter unit and
SERVOPACK.
−
Correct the wiring around serial
converter unit, e.g., separating I/O
signal line from main circuit cable
or grounding.
A serial converter unit fault
occurred.
−
Replace the serial converter unit.
A fault occurred in the SERVO-
PACK.
−
Replace the SERVOPACK.
A.d00:
Position Error
Overflow
(Position error exceeded
the value set in the
excessive position error
alarm level (Pn520).)
The servomotor U, V, and W wir-
ings is faulty.
Check the servomotor main circuit
cable connection.
Confirm that there is no contact
fault in the motor wiring or encoder
wiring.
The frequency of the position ref-
erence pulse is too high.
Reduce the reference pulse fre-
quency, and operate the SERVO-
PACK.
Reduce the position reference pulse
frequency or acceleration of posi-
tion reference. Or, reconsider the
electronic gear ratio.
The acceleration of the position
reference is too high.
Reduce the reference acceleration,
and operate the SERVOPACK.
Apply the smoothing function, such
as using position reference accelera-
tion/deceleration time constant
(Pn216).
Setting of the excessive position
error alarm level (Pn520) is low
against the operating condition.
Check the alarm level (Pn520) to
see if it is set to an appropriate
value.
Set the Pn520 to proper value.
A fault occurred in the SERVO-
PACK.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.d01:
Position Error
Overflow Alarm at
Servo ON
This alarm occurs if the servomo-
tor power is turned ON when the
position error is greater than the
set value of Pn526 while the ser-
vomotor power is OFF.
Check the position error amount
(Un008) while the servomotor
power is OFF.
Set position error to be cleared
while the servomotor power is OFF.
Or, correct the excessive position
error alarm level at servo ON
(Pn526).
A.d02:
Position Error
Overflow Alarm by
Speed Limit at Servo
ON
When the position errors remain
in the error counter, Pn529 limits
the speed if the servomotor power
is ON. If Pn529 limits the speed
in such a state, this alarm occurs
when reference pulses are input
and the number of position errors
exceeds the value set for the
excessive position error alarm
level (Pn520).
−
Set position error to be cleared
while the servomotor power is OFF.
Or, correct the excessive position
error alarm level (Pn520).
Or, adjust the speed limit level at
servo ON (Pn529).
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause
Investigative Actions
Corrective Actions
