Warning Number:
Possible Cause
Warning Name
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.
4.2 SERVOPACKs 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.
4.2.6 Troubleshooting Warnings
Continued from previous page.
Correction
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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