Motor Overload (OL1)

- Description: The electronic thermal relay actuated the motor overload protection function.
+ Cause and Action: The load is excessive, or the acceleration time, deceleration time, and cycle time are too short. Review the load size, acceleration time, deceleration time, and cycle time. The voltage of the V/f characteristics is excessive. Review the V/f characteristics. The rated input current of the motor set with n032 is improper. Set n032 properly.

Inverter Overload (OL2)

- Description: The electronic thermal relay actuated the Inverter overload protection function.
+ Cause and Action: The load size is excessive, or the acceleration time, deceleration time, and cycle time are too short. Review the load size, acceleration time, deceleration time, and cycle time. The voltage of the V/f characteristics is excessive. Review the V/f characteristics. The capacity of the Inverter is too small. Replace the Inverter with a model that has a larger capacity. High carrier frequency (400V-class models). Decrease the set value of n050.

Overtorque (OL3)

- Description: A current exceeding the value set with n075 flowed for more than the time set with n076.
+ Cause and Action: Check whether the n075 and n076 settings are appropriate. Check the machine use status and eliminate the cause of the problem.

External Errors (Terminal S2, S3, S4, S5, S6)

- Description: An external error is input.
+ Cause and Action: Remove the cause of the external error.

Digital Operator Connection Error

- Description: The Digital Operator became disconnected while the Inverter was running.
+ Cause and Action: The connecting cable is broken. There is a fault in one of the connectors on the Inverter or the Digital Operator. Re-insert or clean the connectors before turning ON the power supply again. Parameter incorrectly set. Set n112 to 0. If this problem persists, replace the cable or the Inverter.

Digital Operator Transmission Error (CPF0, CPF1)

- Description: The Inverter could not communicate with the Digital Operator within 5 seconds after power is supplied to the Inverter (CPF0). A transmission error lasting longer than 2 seconds occurred after transmission with the Digital Operator started (CPF1).
+ Cause and Action: The Digital Operator is not connected to the Inverter properly. Reconnect the Digital Operator to the Inverter. The CPU of the Inverter is broken. Replace the Inverter.

EEPROM Fault (CPF4)

- Description: EEPROM fault.
+ Cause and Action: Turn the power supply to the Inverter OFF and ON. If this problem persists, replace the Inverter.

A/D Converter Fault (OPF5)

- Description: A/D converter fault.
+ Cause and Action: Turn the power supply to the Inverter OFF and ON. If this problem persists, replace the Inverter.

Warnings

- Description: When a warning status arises, the Inverter will not generate an error contact output. Eliminating the cause will recover the system automatically.
+ Cause and Action: Review the sequence used for the forward and reverse rotation commands. Check whether the voltage of the power supply to the Inverter is proper. Check whether the power input line to the Inverter is broken or disconnected. Check the terminal block screws for looseness. Install a cooling fan or air conditioner if the ambient temperature is too high. Turn OFF the inverter overheat warning or the remote baseblock command input. Reset n002 if the operation mode setting is improper. Check the multi-function input settings and V/f data settings. Make sure that the rated input current of the motor satisfies the condition. Reset jumping frequencies and the upper and lower limits of the output frequency if necessary.

Stopping methods can be selected for the errors with asterisk marks. If the Inverter or motor does not operate properly when the system is started, parameter settings or wiring may be incorrect. In this case, take the appropriate action as described above. If an error code is displayed, refer to the Protective and Diagnostic Functions section.