5-8
Troubleshooting for OV, LV error
The inverter displays OV, LV
Apply power
Any abnormal
indications?
Input operation command
Input frequency commands
Replace the main circuit fuse
Replace the faulty
circuit
board
Replace the control board
Replace the control board
Replace the control board
Replace the control board
Perform detailed check
The inverter is failed
NO
YES
YES
NO
NO
YES
‧
Is the main circuit fuse
intact
?
Any visual abnormalities?
Is FWD LED still
illuminated after flash
Connect the motor to run
The inverter’s output is OK
YES
YES
YES
YES
NO
NO
NO
NO
Is the output frequency of the
operating unit displayed?
Is there
Voltage at T1,T2,T3 output
terminals?
Any abnormal value?
Is the current on all
phase
s
even?
Is the inverter
working well after
replacement?
YES
YES
NO
NO
Figure 5-3 OV, LV Fault Display Flow Chart