OC1 Overcurrent during acceleration
1. Increase the acceleration time (ACC).
2. Increase or decrease the torque boost level (ωb).

OC2 Overcurrent during deceleration
1. Increase the deceleration time (dEC).

OC3 Overcurrent during constant-speed run
1. Reduce the variance of the load conditions.

OCA Phase short circuit
1. The main circuit is abnormal. Ask your agent to repair the inverter.

OCL Load-end short circuit (output terminal check) trip during start-up
1. The insulation of the main output circuit or motor is abnormal.
2. Check the wiring and insulation.
3. If 1 and 2 are normal, the elements of the main circuit may be defective. Ask your agent to repair the inverter.

OP1 Overvoltage during acceleration
1. Check the power voltage.
2. Check if the power is turned on and off frequently.
3. Check whether or not excessive current flows instantaneously through a load.


OP2 Overvoltage during deceleration
1. Increase the deceleration time (dEC).

OP3 Overvoltage
1. Check the power voltage.
2. Check if the power is turned on and off frequently.
3. Check whether or not excessive current flows instantaneously through a load.

nOFF Undervoltage
1. The input voltage is too low.
2. Check the power supply condition and input wiring.

OL1 Inverter overload trip
1. The load is excessive. Reduce it.
2. The V/f characteristics or torque boost level are not proper. Check whether or not a 50 Hz rated motor runs on the 60 Hz base frequency. Increase or decrease the torque boost level.
3. Increase the inverter rating.

OL2 Motor overload trip

OLr Braking resistor overload trip
1. Increase the deceleration time (dEC).

OH Overheat trip
1. Check whether or not the ambient temperature is too high. If the ambient temperature is too high, remove the seal from the top cover.


E Emergency stop
1. Operation stops on the panel during automatic or remote operation.

EOFF Checking emergency stop acceptance display
1. Operation stops on the panel during automatic or remote operation. Stop operation in an emergency by pressing the STOP key twice. To cancel an emergency stop, press any other key.

EEP1 EEPROM fault
1. Turn off the power, then turn it on again.
2. If the EEPROM does not recover from the error, ask your agent to repair the inverter.

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