Troubleshooting Of Warnings - YASKAWA SGMJV 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
A.900:
Position Error
Overflow
A.901:
Position Error
Overflow Alarm
at Servo ON
A.910:
Overload
(Warning before
the overload alarm
(A.710 or A.720).)
A.911:
Vibration
9-24
Cause
The servomotor U, V,
Check the servomotor main circuit
and W wirings is
cable connection.
faulty.
The SERVOPACK
Check the SERVOPACK gain.
gain is too low.
The acceleration of the
Reduce the reference acceleration,
position reference is
and operate the SERVOPACK.
too high.
Setting of the exces-
sive position error
Check the alarm level (Pn520) to see
alarm level (Pn520) is
if it is set to an appropriate value.
low against the operat-
ing condition.
A SERVOPACK fault
−
occurred.
When the servomotor
power is ON, the posi-
−
tion error exceeded the
parameter setting
(Pn526×Pn528/100).
Incorrect wiring or
contact fault of servo- Check the wiring.
motor and encoder.
Operation beyond the
Check the motor overload character-
overload protection
istics 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
problems.
A SERVOPACK fault
−
occurred.
Abnormal vibration Check for abnormal noise from the
was detected at the servomotor, and check the speed and
motor 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 wir-
ing.
Increase the servo gain by using the
function such as advanced autotun-
ing.
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.
Set the Pn520 to proper value.
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.
Set an appropriate value for the
excessive 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.