YASKAWA Σ-V Series User Manual page 263

8 Troubleshooting
8.1.2 Troubleshooting of Alarms
Alarm:
Alarm Name
A.CF1:
Feedback Option
Module
Communications Error
(Reception error)
A.CF2:
Feedback Option
Module
Communications Error
(Timer stop)
A.d00:
Position Error Pulse
Overflow
(Position error exceeded
the value set in the
excessive position error
alarm level (Pn520))
A.d01:
Position Error Pulse
Overflow Alarm at
Servo ON
A.d02:
Position Error Pulse
Overflow Alarm by
Speed Limit at Servo
ON
A.d30:
Position Data
Overflow
8-18
Cause
Wiring of cable between serial
converter unit and SERVOPACK
is incorrect or contact is faulty.
The specified cable is not used
between serial converter unit and
SERVOPACK.
Cable between serial converter
unit and SERVOPACK is too
long.
Sheath of cable between serial
converter unit and SERVOPACK
is broken.
Noise interferes with the cable
between serial converter unit and
SERVOPACK.
A serial converter unit fault
occurred.
A SERVOPACK fault occurred.
The contact in the linear servo-
motor U, V, and W wirings is
faulty.
The SERVOPACK gains are too
low.
The frequency of the position ref-
erence is too high.
The position reference accelera-
tion is too fast.
Setting of the Pn520 (Excessive
Position Error Alarm Level) is
too low for the operating condi-
tion.
A SERVOPACK fault occurred.
When setting not to clear position
error, the linear servomotor
moved while the servo was OFF,
resulting in position error over-
flow.
The servo was turned ON while
the position error accumulated,
and the reference was input while
the linear servomotor was run-
ning at the speed limit (Pn584).
As a result, the position error
count exceeded the excessive
position error alarm level
(Pn520).
The position data exceeded
±1879048192.
Investigative Actions
Check the linear scale wiring.
Confirm the linear scale wiring
specifications.
Measure the length of the cable for
connecting the serial converter unit.
Check the cable for connecting the
serial converter unit.
−
−
−
Check the linear servomotor main
circuit cable connection.
Check the SERVOPACK gains to
see if they are not too low.
Reduce the reference frequency, and
operate the SERVOPACK.
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 error counter (Un008)
while the linear servomotor power
is OFF.
–
Check the reference counter
(Un00C).
Corrective Actions
Correct the cable wiring.
Use the specified cable.
The cable between serial converter
unit and SERVOPACK must be 20
m max.
Replace the cable.
Correct the wiring around serial
converter unit, e.g., separating
input/output 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 linear servomotor wiring
and linear scale wiring.
Increase the servo gains (Pn100,
Pn102, etc.)
Reduce the position reference fre-
quency or reference acceleration.
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.
Make the setting so that the position
error is cleared when the servo is
OFF.
Or, correct the excessive position
error alarm level at servo ON
(Pn526).
Set position error to be cleared
while in servo OFF status.
Or, correct the excessive position
error alarm level (Pn520).
Or, adjust the speed limit level
(Pn584) when servo turns ON.
Reconsider the operating specifica-
tions.