Chapter 5 Trouble shooting and maintenance
5-10
Troubleshooting for OV, LV error display
The inverter displays OV. LV
Is the main
circuit fuse
intact?
Apply power
Fault message
Input operation commands
Input frequency commands
Is the output frequency
of the operating unit
displayed?
Are there outputs on
output terminals T1, T2,
and T3?
motor running
Any
Fault
Message
Are currents of
all phases
even?
The inverter is OK
Replace the main circuit board
Replace the control board
Replace the control board
Replace the control board
Is the inverter
working after
replacement?
Perform detailed
Fault
checks
YES
YES
YES
YES
NO
NO
NO
NO
NO
YES
•
YES
Yes
No
No
Figure 5-3 OV, Fault Troubleshooting