Chapter 5 Trouble shooting and maintenance
5-12
Motor is overheated
Motor runs unevenly
Is the
measured
load or
the current exceeding
the
configured
value?
Reduce the load
Increase
ratings
of EV and the
motor
Select
a different motor
EV fault
Correct bad connection
Clear the
debris
Bad connection between EV
and
the motor
Is
EV
running
in low speed
for a long time
?
Are voltages between
phase
even
?
Is there any
debris
preventing cooling
the motor?
YES
YES
YES
YES
YES (
measured
-3% of output
l
)
NO
NO
NO
Does it
occur
when
accelerating/
decelerating?
Is the load
freewheeling
?
Any vibration or
backlash in the
gears
Is the
acceleration/deceler
ation time
correct
for the application
?
Increase the acc/dec time
Reduce the load
Increase
or ratings for
7300EV and the motor
EV faults
•
Reduce the
freewheeling
or
add a flywheel
Improve the mechanical system
EV Faults
YES (
measured
-3% of rated output voltage)
YES
YES
YES
NO
NO
NO
NO
Small
Large
Are output voltages
between
balanced?
No
Figure5-5 Motor Overload/Overheating Diagnostics
Figure5-6 Oneven Speed Operation Diagnostics
