CPU Error:

    CPU malfunction.

Main Undervolts:

    The 3-phase input voltage is low.
    Defective control board.
    Excessive load on the power supply.
    Undervoltage/Ridethrough settings need adjustment.

Fuse:

    The internal DC bus fuse is open.

DBR Overcurrent:

    Inability to discharge bus voltage during regeneration.
    No dynamic braking resistor (DBR) installed.
    Deceleration time is too short.
    Incorrect DBR setup information.
    Defective IGBT7 (or IGBT7 circuit).
    The 3-phase input voltage is above specification.

DBR Overload:

    Deceleration time is too short.
    DBR setting requires adjustment.
    Overvoltage Stall setting needs adjustment.

Ground Fault (GND Fault):

    Ground fault at the motor.
    Ground fault at the output of the VFD.
    Current leakage to Earth Ground.

Control EEPROM Error (Ctrl EEPROM Err):

    Internal EEPROM malfunction.

EEPROM Write Error:

    EEPROM write malfunction.

Emergency Off (E-Off):

    Emergency Off command received via keypad or remotely.

Encoder Loss:

    Encoder signal is lost during closed-loop operation.

Flash Error:

    Flash memory malfunction.

Gate Array Error:

    Defective Gate Array or Gate Array malfunction.

Input Phase Loss:

    The 3-phase input to the VFD is low or missing.

Load Drooping:

    The load requirement exceeds the capacity of the motor.

Load End Overcurrent:

    Incorrect wiring at the VFD output to the motor.

Under Current Trip:

    Incorrect Low Current detection level setting.

Main EEPROM Error:

    Internal EEPROM malfunction.

Atn - Autotune Active:

Atn indicates that the Autotune function is active. If the initial Autotune fails for any reason, an automatic retry is initiated if the "Other Motor" option is selected at parameter F413. Autotune ensures that the motor and drive are optimally configured to work together for the best performance by automatically adjusting necessary settings.

db or dbOn - DC Braking Active:

This code indicates that the DC Injection function is being applied. The display shows "db" during braking and "dbOn" when the Shaft Stationary function is active. DC braking is used to bring the motor to a stop more quickly and is typically applied when the shaft of the machine needs to come to a complete stop.

OLI - VFD Overload:

The load requirement exceeds the capacity of the VFD.

    The carrier frequency is too high.
    Excessive load.
    The acceleration time is too short.
    DC damping rate is set too high.
    The motor starts into a spinning load after a momentary power failure.
    The VFD is not properly matched to the application.

OLM - Motor Overload:

The load requirement exceeds the capacity of the motor.

    The V/f parameter is incorrectly set.
    The motor is locked.
    Continuous operation at low speed.
    The load exceeds what the motor can deliver.

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+ Toshiba Q7 Fault codes 2 >>

+ Toshiba Q7 Fault codes 3 >>

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