Chapter 5 Troubleshooting and maintenance
5-10
Troubleshooting for OV, LV error
The inverter displays OV, LV
Apply the 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 faults
NO
YES
YES
NO
NO
YES
‧
Is the main circuit fuse
intact
?
Any abnormalities in
appearances?
Is FWD LED keeping
lit 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?
Are there
voltage output at T1,T2,T3
output terminals?
Any abnormal value?
Any current of all
phase even?
Is the inverter
working well after
replacement
YES
YES
NO
NO