The motor runs in the wrong direction:

    Invert the phases of the output terminals U, V, and W.
    Invert the forward/reverse run-signal terminals of the external input device. (See 7.2.1 "Assignment of functions to control terminals".)
    Change the setting of the fr parameter in the case of panel operation.

The motor runs but its speed does not change normally:

    The load is too heavy. Reduce the load.
    The soft stall function is activated. Disable the soft stall function. (See 5.13)
    The maximum frequency fh and the upper limit frequency ul are set too low. Increase both.
    The frequency setting signal is too low. Check the signal value, circuit, and cables.
    Check the characteristics of the frequency setting signal parameters (point 1 and point 2 settings). (See 6.5.1)
    If the motor runs at a low speed, check if the stall prevention function is activated because the torque boost amount is too large. Adjust the torque boost (ub) and acceleration time (acc). (See 5.12 and 5.3)

The motor does not accelerate or decelerate smoothly:

    The acceleration time (acc) or deceleration time (dec) is set too short. Increase the times.

Too much current flows into the motor:

    The load is too heavy. Reduce the load.
    If the motor runs at a low speed, check if the torque boost amount is too large. (See 5.12)

The motor runs at a higher or lower speed than specified:

    The motor may have an improper voltage rating. Use a motor with a proper voltage rating.
    The motor terminal voltage is too low. Check the base frequency voltage parameter (vlv). (See 5.10)
    Replace the cable with one of a larger diameter.
    The reduction gear ratio is not set properly. Adjust the reduction gear ratio.
    The output frequency is not set correctly. Check the frequency range.
    Adjust the base frequency. (See 5.10)

The motor speed fluctuates during operation:

    The load is too heavy or too light. Reduce load fluctuations.
    The inverter or motor is not rated to handle the load. Use an inverter or motor with a proper rating.
    Check if the frequency setting signal changes.
    If the V/F control selection parameter (pt) is set to 3, check the vector control settings. (See 5.11)

Parameter settings cannot be changed:

    If the parameter setting selection prohibited parameter f700 is set to 1 or 2 (prohibited), change it to 0 (enabled).
        For safety reasons, some parameters cannot be reprogrammed while the inverter is running. (See 6.18.1)

Problems related to parameter settings:

    If you forget the reset parameters: You can search for all reset parameters and change their settings. (See 4.3.1)
    If you want to return all reset parameters to default: You can restore all reset parameters to their default settings. (See 4.3.2)

OC1 0001: Overcurrent during acceleration (read more >> ) >>

OC2 0002: Overcurrent during deceleration (read more >> ) >>

OC3 0003: Overcurrent during constant speed operation (read more >> ) >>

OCL 0004: Overcurrent (An overcurrent on the load side at start-up) (read more >> ) >>

OCA 0005: Arm overcurrent at start-up (read more >> ) >>

EPHI 0008: Input phase failure (read more >> ) >>

EPHO 0009: Output phase failure (read more >> ) >>

OP1 000A: Overvoltage during acceleration (read more >> ) >>

OP2 000B: Overvoltage during deceleration (read more >> ) >>

OP3 000C: Overvoltage during constant-speed operation (read more >> ) >>

OL1 000D: Inverter overload (read more >> ) >>

OL2 000E: Motor overload (read more >> ) >>

OL3 003E: Main module overload (read more >> ) >>

OT 0020: Over-torque trip (read more >> ) >>

OH 0010: Overheat (read more >> ) >>

E 0011: Emergency stop (read more >> ) >>

EEP1 0012: EEPROM fault 1 (read more >> ) >>

EEP1 0013: EEPROM fault 2 (read more >> ) >>

EEP3 0014: EEPROM fault 3 (read more >> ) >>

Err1: Frequency point setting error alarm (read more >> ) >>

Err2 0015: Main unit RAM fault (read more >> ) >>

Err3 0016: Main unit ROM fault (read more >> ) >>

Err4 0017: CPU fault 1 (read more >> ) >>

Err5 0018: Remote control error (read more >> ) >>

Err7 001A: Current detector fault (read more >> ) >>

UC 001D: Low-current operation trip (read more >> ) >>

UPI 001E: Undervoltage trip (main circuit) (read more >> ) >>

EF2 0022: Ground fault trip (read more >> ) >>

ETNI 0054: Auto-tuning error (read more >> ) >>

ETYP 0029: Inverter type error (read more >> ) >>

E-18 0032: Break in analog signal cable (read more >> ) >>

E-19 0033: CPU communications error (read more >> ) >>

E-20 0034: Excessive torque boosted (read more >> ) >>

E21 0035: CPU fault 2 (read more >> ) >>

E26 003A: CPU fault 3 (read more >> ) >>

OFF: ST terminal OFF (read more >> ) >>

NOFF: Undervoltage in main circuit (read more >> ) >>

rTrY: Retry in process (read more >> ) >>

CLr: Clear command acceptable (read more >> ) >>

EoFF: Emergency stop command acceptable (read more >> ) >>

HI/LO: Setting error alarm (read more >> ) >>

HEAD/END: Display of first/last data items (read more >> ) >>

db: DC braking (read more >> ) >>

E1, E2, E3: Flowing out of excess number of digits (read more >> ) >>

StoP: Momentary power failure slowdown stop prohibition function activated (read more >> ) >>

LSTP: Auto-stop because of continuous operation at the lower-limit frequency (read more >> ) >>

InıT: Parameters in the process of initialization (read more >> ) >>

A-05: Output frequency upper limit (read more >> ) >>

A-17: Operation panel key fault (read more >> ) >>

Atn: Auto-tuning (read more >> ) >>

E-50: Source logic switching check alarm (read more >> ) >>

E-51: Sink logic switching check alarm (read more >> ) >>

C: Overcurrent alarm (Same as OC) (read more >> ) >>

P: Overvoltage alarm (Same as OP) (read more >> ) >>

L: Overload alarm (Same as OL1 and OL2) (read more >> ) >>

H: Overheat alarm (Same as OH) (read more >> ) >>

• Toshiba Vf-NC3 fault code
• Toshiba Vf-NC3 fault code 2
• Toshiba Vf-NC3 fault code 3