YASKAWA UAK series User Manual page 283

Alarm:
Alarm Name
The multiturn limit value of the
encoder is different from that of
the SERVOPACK. Or, the multi-
turn limit value of the SERVO-
A.CC0:
PACK has been changed.
Multiturn Limit
Disagreement
SERVOPACK failure
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
A.CF1:
SERVOPACK.
Serial Converter Unit
Communications Error
Cable between serial converter
(Reception error)
unit and SERVOPACK is too
long.
Sheath of cable between serial
converter unit and SERVOPACK
is broken.
Noise interferes with the cable
A.CF2:
between serial converter unit and
Serial Converter Unit SERVOPACK.
Communications Error
Serial converter unit failure
(Timer stop)
SERVOPACK failure
The contact in the servomotor U,
V, and W wirings is faulty.
The position reference speed is
too high.
A.D00:
Position Error Pulse
The acceleration of the position
Overflow
reference is too high.
(Position error exceeded
Setting of the Pn520 (Excessive
the value set in the
Position Error Alarm Level) is
excessive position error
low against the operating condi-
alarm level (Pn520))
tion.
SERVOPACK failure
The SV_ON command (Enable
A.D01:
operation) is received when the
Position Error Pulse number of position error pulses is
greater than the set value of
Overflow Alarm at
Pn526 while the servomotor
Servo ON
power is OFF.
Cause Investigative Actions
Check the value of the Pn205 of the
SERVOPACK.
−
Check the external encoder wiring.
Confirm the external encoder wir-
ing specifications.
Measure the external encoder cable
length.
Check the external encoder cable.
−
−
−
Check the motor main circuit cable
connection.
Reduce the reference speed, 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 monitor in
SigmaWin for the Σ-V-SD (MT)
while the servomotor power is OFF.
11.2 Alarm Displays
(cont'd)
Corrective Actions
Change the settings at the occur-
rence of alarm.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
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
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 motor wiring of encoder
wiring.
Reduce the position reference speed
or acceleration of position refer-
ence.
Reduce the reference acceleration
of the position reference.
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.
Correct the excessive position error
alarm level at servo ON (Pn526).
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