YASKAWA Sigma-V Series User Manual page 375

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