Troubleshooting Of Warnings - YASKAWA SGDV series User Manual

9 Troubleshooting

9.2.2 Troubleshooting of Warnings

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 (Warning
Description)
A.900:
Position Error
Overflow
A.901:
Position Error
Overflow Alarm
at Servo ON
A.910:
Overload
(Warning before
alarm A.710 or
A.720 occurs)
A.911:
Vibration
9-24
Cause
The servomotor U, V, Check the servomotor main circuit
and W wirings is faulty. cable connection.
The SERVOPACK gain
Check the SERVOPACK gain.
is too low.
The acceleration of the
Reduce the reference acceleration, and
position reference is too
operate the SERVOPACK.
high.
Setting of the excessive
position error alarm
Check the alarm level (Pn520) to see
level (Pn520) is low
if it is set to an appropriate value.
against the operating
condition.
A fault occurred in the
−
SERVOPACK.
When the servomotor
power is ON, the posi-
−
tion error exceeded the
parameter setting
(Pn526×Pn528/100).
Incorrect wiring or con-
tact fault of servomotor Check the wiring.
and encoder.
Operation beyond the
Check the motor overload characteris-
overload protection
tics and executed run command.
characteristics.
Excessive load was
applied during opera-
tion because the servo- Check the executed operation refer-
motor was not driven ence and motor speed.
due to mechanical prob-
lems.
A fault occurred in the
−
SERVOPACK.
Abnormal vibration was Check for abnormal noise from the
detected at the motor servomotor, and check the speed and
speed. torque waveforms during operation.
The moment of inertia
ratio (Pn103) value is
greater than the actual Check the moment of inertia ratio.
value or is greatly
changed.
Investigative Actions Corrective Actions
Confirm that there is no contact fault
in the motor wiring or encoder wiring.
Increase the servo gain by using the
function such as advanced autotuning.
Reduce the reference acceleration of
the position reference.
Set the Pn520 to proper value.
Turn the power supply OFF and then
ON again. If the alarm still occurs, the
SERVOPACK may be faulty. Replace
the SERVOPACK.
Set an appropriate value for the exces-
sive position error warning level at
servo ON (Pn528).
Confirm that the servomotor and
encoder are correctly wired.
Reconsider the load conditions and
operating conditions. Or, increase the
motor capacity.
Remove the mechanical problems.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
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.