YASKAWA SGDV User Manual page 276

Warning
Number:
Warning Name Cause
(Warning
Description)
Abnormal vibration was
detected at the motor
speed.
A.911:
The moment of inertia
Vibration
ratio (Pn103) value is
greater than the actual
value or is greatly
changed.
A.930: The battery connection
is incorrect.
Absolute
Encoder Battery
The battery voltage is
Error
lower than the specified
(The absolute
value 2.7 V.
encoder battery
voltage is lower
than the specified
value.)
A SERVOPACK fault
occurred.
(Only when an
absolute encoder
is connected.)
A.941:
Parameters that require
Change of
the restart have been
Parameters
changed.
Requires Restart
A.9A0:
When the servomotor
Overtravel
power is ON, over-
(Overtravel status
travel status is detected.
is detected.)
Investigative Actions
Check for abnormal noise from the
servomotor, and check the speed and
torque waveforms during operation.
Check the moment of inertia ratio.
Check the battery connection.
Measure the battery voltage.
−
−
Check the input signal monitor
(Un005) to check the status of the
overtravel signals.
9.2 Warning Displays
(cont'd)
Corrective Actions
Reduce the motor speed or reduce the
servo gain by using the function such
as one-parameter tuning.
Set the moment of inertia ratio
(Pn103) to an appropriate value.
Reconnect the battery.
Replace the battery.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Restart the SERVOPACK.
Refer to 9.3 Troubleshooting Malfunc-
tion Based on Operation and Condi-
tions of the Servomotor. Even if
overtravel signals were not shown by
the input signal monitor (Un005),
momentary overtravel may have been
detected. Take the following precau-
tions.
• Do not specify movements that
would cause overtravel from the
host controller.
• Check the wiring of the overtravel
signals.
• Take countermeasures for noise.
9
9-17