71
Is motor over-
loaded or running
over rated current?
Reduce the load
using higher rating
inverter and motors
Is motor under low
speed operation for
a long period?
Select right motors
for long term speed
operation.
Are output voltages
T1(U), T2(V), and
T3(W) balanced?
Rectify the
connection
Inverter is damaged
Remove hinderance
Faults connection
between inverter
motor?
Is there any
hinderance to
motor cooling?
During accel/
decel?
Is accel/ decel time
set properly?
Increase accel. /
decel. time
-Reduced load
-Use higher rating
inverter and motors
Inverter is damaged
Install a flywheel
Inverter is damaged
Improved
mechanical system
Are the output voltages
T1(U), T2(V), and T3(W)
balanced?
Does the load vary
frequently?
Is gear and transmission
system vibrating excessively?
YES
NO
YES
YES
(2)
Motor overheated
NO
NO
YES (+/- 3% of maximum voltage output)
NO
NO
YES
YES
YES
YES
NO
NO
NO
YES (+/- 3% of maximum voltage output)
(3)
Motor does not run smoothly
YES
NO
Lower Fn05 value.
Fn05 torque boost
turned up to high.