Hi everyone,
    When a problem occurs, diagnose according to the table below. If parts replacement is necessary or the problem cannot be resolved with the solutions listed in the table, contact your Toshiba distributor.

Error Code: OC1

    Failure Code: 0001
    Problem: Overcurrent during acceleration
    Possible Causes:
+ Acceleration time (ACC) is too short.
+ V/F setting is not appropriate.
+ A restart signal is given to a rotating motor after a temporary stop, etc.
+ A special motor (e.g., a low-impedance motor) is used.
    Solutions:
+ Increase the acceleration time ACC.
+ Check the V/F parameter setting.
+ Use F301 (automatic restart) and F302 (sustain control).
+ Reduce motor output current and perform auto-tuning for a special motor.

Error Code: OC2

    Failure Code: 0002
    Problem: Overcurrent during deceleration
    Possible Causes:
+ Deceleration time (DEC) is too short.
+ A low inductance motor, particularly a high-speed motor, is used.
    Solutions:
+ Increase the deceleration time DEC.
+ Select a higher power range inverter (1 class higher driver is recommended).

Error Code: OC3

    Failure Code: 0003
    Problem: Overcurrent during constant speed operation
    Possible Causes:
+ Load fluctuates suddenly.
+ A low inductance motor, particularly a high-speed motor, is used.
    Solutions:
+ Reduce load fluctuations.
+ Select a higher power range inverter (1 class higher driver is recommended).

Error Code: OCL

    Failure Code: 0004
    Problem: Overcurrent (Overcurrent on load side at startup)
    Possible Causes:
+ Insulation of the power main circuit or motor is faulty.
+ The impedance of the motor is too low.
    Solutions:
+ Check the main circuit connections and insulation status.
+ Set F301 = 2, 3.

Error Code: EPH1

    Failure Code: 0008
    Problem: Input phase failure
    Possible Causes:
+ A phase failure occurred in the input line of the main circuit.
+ The capacitor in the main circuit does not have sufficient capacity.
    Solutions:
+ Check for phase failure in the input line of the main circuit.
+ Check whether the capacitor in the main circuit has sufficient capacity.

Error Code: EPH0

    Failure Code: 0009
    Problem: Output phase failure
    Possible Causes:
+ A phase failure occurred in the output line of the main circuit.
    Solutions:
+ Check for phase failure in the output line of the main circuit.

Error Code: OV1 (ou1)

    Failure Code: 0010
    Problem: Overvoltage during acceleration
    Possible Causes:
+ The input voltage fluctuates abnormally.
+ The capacity of the power supply is 500kVA or more (a transformer is used).
+ A power factor correction capacitor is connected to the power line.
+ A system using thyristors is connected to the same power distribution line.
    Solutions:
+ Use F301 (automatic restart) and F302 (sustain control).
+ Increase the deceleration time DEC.

Error Code: OP2

    Failure Code: 000B
    Problem: Overvoltage during deceleration
    Possible Causes:
+ Deceleration time (DEC) is too short. (Regenerative energy is too large.)
+ The input voltage fluctuates abnormally.
+ The power supply has a capacity of 500kVA or more.
+ A power factor correction capacitor is connected.
+ A system using thyristors is connected to the same power distribution line.
    Solutions:
+ Increase the deceleration time DEC.
+ Set overvoltage limit function F305 to 0 (Disabled).
+ Add a suitable input reactor.

Error Code: OP3

    Failure Code: 000C
    Problem: Overvoltage during constant speed operation
    Possible Causes:
+ The input voltage fluctuates abnormally.
+ The power supply has a capacity of 500kVA or more.
+ A power factor correction capacitor is connected.
+ A system using thyristors is connected to the same power distribution line.
    Solutions:
+ Add a suitable input reactor.
+ Install an optional dynamic braking resistor (if available).

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