Troubleshooting Of Warnings - YASKAWA Sigma-V Series User Manual

10.2.2 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)
The servomotor U, V,
and W wirings is faulty.
The SERVOPACK gain
is too low.
The frequency of the
position reference pulse
is too high.
A.900:
The acceleration of the
Position Error
position reference is too
Overflow
high.
Setting of the excessive
position error alarm
level (Pn520) is low
against the operating
condition.
A fault occurred in the
SERVOPACK.
When the servomotor
A.901:
power is ON, the posi-
Position Error
tion error exceeded the
Overflow Alarm
parameter setting
at Servo ON
(Pn526×Pn528/100).
Incorrect wiring or con-
tact fault of servomotor
and encoder.
Operation beyond the
overload protection
A.910:
characteristics.
Overload
Excessive load was
(Warning before
applied during opera-
alarm A.710 or
tion because the servo-
A.720 occurs)
motor was not driven
due to mechanical prob-
lems.
A fault occurred in the
SERVOPACK.
Cause Investigative Actions
Check the servomotor main circuit
cable connection.
Check the SERVOPACK gain.
Reduce the reference pulse frequency,
and operate the SERVOPACK.
Reduce the reference acceleration, and
operate the SERVOPACK.
Check the alarm level (Pn520) to see
if it is set to an appropriate value.
−
−
Check the wiring.
Check the motor overload characteris-
tics and executed run command.
Check the executed operation refer-
ence and motor speed.
−
10.2 Warning Displays
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 position reference pulse
frequency or acceleration of position
reference. Or, reconsider the elec-
tronic gear ratio.
Apply the smoothing function, such as
using the position reference accelera-
tion/deceleration time constant
(Pn216).
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 Pn200.2 to 0 to clear the number
of position error while the servomotor
power is OFF. Or 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.
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