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5.6 Troubleshooting Warnings
Warning Number:
Warning Name
A.910:
Overload (warning
before an A.710 or
A.720 alarm occurs)
A.911:
Vibration
5-42
Possible Cause
Confirmation
The wiring is not
correct or there is
a faulty contact in
Check the wiring.
the motor or
encoder wiring.
Operation was
performed that
Check the motor over-
exceeded the
load characteristics and
overload protec-
Run command.
tion characteris-
tics.
An excessive load
was applied
during operation
because the Ser-
Check the operation ref-
vomotor was not
erence and motor speed.
driven because of
mechanical prob-
lems.
The overload
Check that the overload
warning level
warning level (Pn52B) is
(Pn52B) is not
suitable.
suitable.
A failure occurred
in the SERVO-
–
PACK.
Check for abnormal
Abnormal vibra-
motor noise, and check
tion was detected
the speed and torque
during motor
waveforms during opera-
operation.
tion.
The setting of
Pn103 (Moment of
Inertia Ratio) is
Check the moment of
greater than the
inertia ratio or mass ratio.
actual moment of
inertia or was
greatly changed.
The vibration
Check that the vibration
detection level
detection level (Pn312 or
(Pn312 or Pn384)
Pn384) is suitable.
is not suitable.
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.
Refer-
ence
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Table of Contents
Troubleshooting
