Chapter 5 Trouble shooting and maintenance
5-11
Is MCCB
closed?
Can MCCB be
closed?
‘LED indicator
lit?
Check for short-circuited wiring
˙
Bad power quality
˙
or wiring incorrect
EV fault
Set switch to “RUN” position
EV fault
EV fault
YES (normal value within 3%)
YES (motor does not rotate), the phase-to phase voltage is within
3% for all motor leads.
․
Motor over load
․
Motor faults
․
wiring incorrect
YES
YES
NO
NO
Is the operation
switch in RUN
position?
NO
NO
NO
NO
NO
The motor doesn’t run
Is the voltage between
Leads correct?
Is there
output? (Motor leads)
Are
Voltage outputs even?
Figure 5-4 Drive Running Troubleshooting diagnostics