YASKAWA SGDV SERVOPACK, User Manual

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9 Troubleshooting
9.1.2 Troubleshooting of Alarms
9-18
A.Cb0:
Encoder Echoback Er-
ror
The wiring and contact for linear
scale connection cables are incor-
rect.
Check the wiring. Correct the wiring.
Noise interference occurred due
to incorrect cable specifications
of linear scale connection cables.

Use tinned annealed copper
shielded twisted-pair or screened
unshielded twisted-pair cable with a
core of at least 0.12 mm
2
.
Noise interference occurred
because the wiring distance for
the linear scale connection cables
are too long.

The wiring distance must be 20 m
max.
The FG potential varies because
of influence from machines on
the servomotor side, such as the
welder.
Check the cable layout for linear
scale connection cables. Properly ground the machines to
separate from linear scale FG.
Excessive vibration and shocks
were applied to the linear scale.
Check the operating environment.
Reduce the machine vibration or
correctly install the linear scale.
A linear scale fault occurred.

Turn the power supply OFF and
then ON again. If the alarm still
occurs, the linear scale may be
faulty. Replace the linear scale.
A SERVOPACK fault occurred.

Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.d00:
Position Error Over-
flow
(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 linear
scale 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 SERVOPACK fault occurred.

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 Over-
flow 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 Over-
flow Alarm by Speed
Limit at Servo ON
When the position errors remain
in the error counter, Pn584 limits
the speed if the servomotor power
is ON. If Pn584 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 (Pn584).
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause Investigative Actions Corrective Actions