YASKAWA SGDV User Manual page 272

Alarm Number:
Alarm Name
(Alarm Description)
The wiring and contact for
encoder cable are incorrect.
Noise interference occurred due
to incorrect cable specifications
of encoder cable.
Noise interference occurred
because the wiring distance for
the encoder cable is too long.
The FG potential varies because
A.Cb0:
of influence from machines on
Encoder Echoback
the servomotor side, such as the
Error
welder.
Excessive vibration and shocks
were applied to the encoder.
An encoder fault occurred.
A SERVOPACK fault occurred.
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
A SERVOPACK fault occurred.
The servomotor U, V, and W wir-
ings is faulty.
The frequency of the position ref-
erence pulse is too high.
*3
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 SERVOPACK fault occurred.
This alarm occurs if the servomo-
*3
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.
∗3. This alarm will occur only for a SERVOPACK for pulse train references.
Cause Investigative Actions
Check the wiring.
−
−
Check the cable layout for encoder
cable.
Check the operating environment.
−
−
Check the value of the Pn205 of the
SERVOPACK.
−
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.
9.1 Alarm Displays
(cont'd)
Corrective Actions
Correct the wiring.
Use tinned annealed copper
shielded twisted-pair or screened
unshielded twisted-pair cable with a
2
core of at least 0.12 mm .
The wiring distance must be 50 m
max.
Properly ground the machines to
separate from encoder FG.
Reduce the machine vibration or
correctly install the servomotor.
Restart the SERVOPACK. If the
alarm still occurs, the servomotor
may be faulty. Replace the servo-
motor.
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
Execute Fn013 at the occurrence of
alarm.
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. 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.
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK 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).
9
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