TECO L510S Series - 5.3.2 Troubleshooting for OC, OL error displays

5-9
5.3.2 Troubleshooting for OC, OL error displays
The inverter displays OC, OL errors
The inverter output is OK
Is the output current of each
phase even?
Any fault values displayed?
Is there Voltage at U,V and W
output terminals?
Is the output frequency of the
operating unit displayed?
Is FWD LED illuminated?
Is the main circuit I.G.B.T
working
Any visual abnormalities?
Is the current detector
OK?
Any abnormal indications?
Is the inverter operation OK
after board replacement ?
Replace the current
controller
Replace control board
Replace control board
Replace faulty circuit
board
Replace I.G.B.T
Replace control board
Replace control board
The inverter is faulted
（Perform detailed check）
YES
NO
YES
YES
NO
YES
NO
YES
YES
NO
YES
NO
NO
NO
YES
YES
NO
NO
Apply power
Input operation command
Input frequency command
Connect the motor to run