YASKAWA SGMSV User Manual

9 Troubleshooting
9.2.2 Troubleshooting of Warnings
9-24
9.2.2 Troubleshooting of Warnings
Refer to the following table to identity the cause of a warning and the action to be taken. Contact your
Yaskawa representative if the problem cannot be solved by the described corrective action.
Warning Num-
ber: Warning
Name
Cause Investigative Actions Corrective Actions
A.900:
Position Error
Overflow
The servomotor U, V,
and W wirings is
faulty.
Check the servomotor main circuit
cable connection.
Confirm that there is no contact fault
in the motor wiring or encoder wir-
ing.
The SERVOPACK
gain is too low.
Check the SERVOPACK gain.
Increase the servo gain by using the
function such as advanced autotun-
ing.
The acceleration of the
position reference is
too high.
Reduce the reference acceleration,
and operate the SERVOPACK.
Reduce the reference acceleration of
the position reference using a
MECHATROLINK command, or
smooth the acceleration of the posi-
tion reference by selecting the posi-
tion reference filter (ACCFIL) using
a MECHATROLINK command.
Setting of the exces-
sive position error
alarm level (Pn520) is
low against the operat-
ing condition.
Check the alarm level (Pn520) to see
if it is set to an appropriate value.
Set the Pn520 to proper value.
A SERVOPACK fault
occurred.
−
Turn the power supply to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the SERVOPACK
may be faulty. Replace the SERVO-
PACK .
A.901:
Position Error
Overflow Alarm
at Servo ON
When the servomotor
power is ON, the posi-
tion error exceeded the
parameter setting
(Pn526×Pn528/100).
−
Set an appropriate value for the
excessive position error warning
level at servo ON (Pn528).
A.910:
Overload
(Warning before
the overload alarm
(A.710 or A.720).)
Incorrect wiring or
contact fault of servo-
motor and encoder.
Check the wiring.
Confirm that the servomotor and
encoder are correctly wired.
Operation beyond the
overload protection
characteristics.
Check the motor overload character-
istics and executed run command.
Reconsider the load conditions and
operating conditions. Or, increase
the motor capacity.
Excessive load was
applied during opera-
tion because the servo-
motor was not driven
due to mechanical
problems.
Check the executed operation refer-
ence and motor speed.
Remove the mechanical problems.
A SERVOPACK fault
occurred.
−
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.911:
Vibration
Abnormal vibration
was detected at the
motor speed.
Check for abnormal noise from the
servomotor, and check the speed and
torque waveforms during operation.
Reduce the motor speed or reduce
the servo gain by using the function
such as one-parameter tuning.
The moment of inertia
ratio (Pn103) value is
greater than the actual
value or is greatly
changed.
Check the moment of inertia ratio.
Set the moment of inertia rat
io
(Pn103) to an appropriate value.

YASKAWA SGMSV Specifications

General

Brand	YASKAWA
Model	SGMSV
Category	Servo Drives
Language	English