Troubleshooting Of Warnings - YASKAWA JUSP-MD D01A 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)
9-22
Cause
The servomotor U, V, Check the servomotor main circuit
and W wirings is faulty. cable connection.
The multi-winding
Check the multi-winding drive unit
drive unit gain is too
gain to see if it is low.
low.
The frequency of the Reduce the reference pulse frequency,
position reference pulse and operate the multi-winding drive
is too high. unit.
The acceleration of the
Reduce the reference acceleration, and
position reference is too
operate the multi-winding drive unit.
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
−
multi-winding drive
unit.
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
multi-winding drive −
unit.
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 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 control power supply OFF
and ON again. If the alarm still occurs,
the multi-winding drive unit may be
faulty. Replace the multi-winding
drive unit.
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 multi-winding drive unit may be
faulty. Replace the multi-winding
drive unit.