Troubleshooting Of Warnings - YASKAWA E-V-MD Series User Manual

10 Maintenance, Inspections, and Troubleshooting

10.3.2 Troubleshooting of Warnings

10.3.2 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
Number:
Warning Name
(Warning
Description)
A.900:
Position Error
Overflow
A.910:
Overload
(Warning before
alarm A.710 or
A.720 occurs)
A.911:
Vibration
A.930:
Absolute
Encoder Battery
Error
(The absolute
encoder battery
voltage is lower
than the specified
value.)
(Only when an
absolute encoder
is connected.)
10-16
Cause
The servomotor U, V, Check wiring of the servomotor/
and W wirings is faulty. encoder relay cable.
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.
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.
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.
The battery connection
Check the battery connection.
is incorrect.
The battery voltage is
lower than the specified Measure the battery voltage.
value 2.7 V.
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 using a
MECHATROLINK command, or
smooth the acceleration of the position
reference by selecting the position ref-
erence filter (ACCFIL) using a
MECHATROLINK command.
Set the Pn520 to proper value.
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.
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.