YASKAWA SGM7D-30F Product Manual page 200

Warning Number:
Possible Cause
Warning Name
The position devi-
ation when the
servo was turned
A.901:
ON exceeded the
Position Deviation
percentage set
Overflow Alarm at
with the following
Servo ON
formula:
(Pn526 × Pn528/
100)
The wiring is not
correct or there is
a faulty contact in
the motor or
encoder wiring.
Operation was
performed that
exceeded the
overload protec-
tion characteris-
tics.
A.910: An excessive load
was applied
Overload (warning
during operation
before an A.710 or
because the Ser-
A.720 alarm occurs)
vomotor was not
driven because of
mechanical prob-
lems.
The overload
warning level
(Pn52B) is not
suitable.
A failure occurred
in the SERVO-
PACK.
Abnormal vibra-
tion was detected
during motor
operation.
The setting of
Pn103 (Moment of
A.911:
Inertia Ratio) is
greater than the
Vibration
actual moment of
inertia or was
greatly changed.
The vibration
detection level
(Pn312 or Pn384)
is not suitable.
3.3 FT82 SERVOPACK with MECHATROLINK-III Communications References
Confirmation
–
Check the wiring.
Check the motor over-
load characteristics
and Run command.
Check the operation
reference and motor
speed.
Check that the over-
load warning level
(Pn52B) is suitable.
–
Check for abnormal
motor noise, and check
the speed and torque
waveforms during
operation.
Check the moment of
inertia ratio or mass
ratio.
Check that the vibra-
tion detection level
(Pn312 or Pn384) is
suitable.
3.3.6 Troubleshooting Warnings
Continued from previous page.
Correction
Optimize the setting of
Pn528 (Excessive Position
Error Warning Level at
Servo ON).
Make sure that the Servo-
motor and encoder are cor-
rectly wired.
Reconsider the load and
operating conditions. Or,
increase the motor capacity.
Remove the mechanical
problem.
Set a suitable overload
warning level (Pn52B).
The SERVOPACK may be
faulty. Replace the SERVO-
PACK.
Reduce the motor speed.
Or, reduce the servo gain
with custom tuning.
Set Pn103 (Moment of Iner-
tia Ratio) to an appropriate
value.
Set a suitable vibration
detection level (Pn312 or
Pn384).
Continued on next page.
Reference
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