Hello,

Type (Form) Error:

- The software information (typeform) loaded on the Gate Driver card is inconsistent with the device where the software is used.
- The Gate Driver card has been replaced.
- The Gate Driver card is faulty.

U Phase Overcurrent (U Phase OC):

- Low impedance at the U terminal of the VFD output.

V Phase Overcurrent (V Phase OC):

- Low impedance at the V terminal of the VFD output.

W Phase Overcurrent (W Phase OC):

- Low impedance at the W terminal of the VFD output.

Note: The event causing the trip should be corrected or the threshold triggering the trip should fall below so that the reset can be recognized. In case of multiple active trips, the trip displayed will remain until all faults are corrected and all trips are cleared.

Trips/Faults and Possible Causes

Motor Overload:

- V/f setting needs adjustment.
- Motor is locked.
- Continuous operation at low speed.
- Load requirement exceeds the motor's capacity.
- Start frequency setting needs adjustment.

Option PCB Error:

- Optional device failure.
- Incorrect system settings (on VFD or optional device).
- Loose or faulty connection.

Output Phase Loss:

- Three-phase output from VFD is low or missing.

Overcurrent Acceleration (Overcurrent Acc):

- V/f setting needs adjustment.
- Restarting after a transient power outage.
- VFD starts with a rotating motor.
- VFD/Motor mismatch.
- Phase-to-phase short circuit (U, V, or W).
- Acceleration time is too short.
- Voltage Boost setting is too high.
- Motor/machine is jammed.
- Mechanical brake is engaged while VFD is running.
- In VFDs of 100 HP or less, this fault occurs when VFD current exceeds 340% of the rated FLA during acceleration. In VFDs larger than 100 HP, this fault occurs when VFD current exceeds 320% of the rated FLA during acceleration.

Overcurrent Deceleration (Overcurrent Dec):

- Phase-to-phase short circuit (U, V, or W).
- Deceleration time is too short.
- Motor/machine is jammed.
- Mechanical brake is engaged while VFD is running.
- In VFDs of 100 HP or less, this fault occurs when VFD current exceeds 340% of the rated FLA during deceleration. In VFDs larger than 100 HP, this fault occurs when VFD current exceeds 320% of the rated FLA during deceleration.

Overcurrent Run at Constant Speed:

- Load fluctuations.
- VFD operates at high temperature.
- In VFDs of 100 HP or less, this fault occurs when VFD current exceeds 340% of the rated FLA at constant speed or if VFD overheats at constant speed. In VFDs larger than 100 HP, this fault occurs when VFD current exceeds 320% of the rated FLA at constant speed.

Overheat:

- Cooling fan is not working.
- Ventilation openings are blocked.
- Internal thermistor connection is broken.

A trip is a response of the Drive in a fault condition (sometimes Fault and Trip can be used interchangeably). A trip is a safety feature that allows for the shutdown of a VFD system when a subsystem fails.

Below is a list of possible faults that can cause a Trip and their possible causes. When a Trip occurs, the system displays a Fault screen. The Fault screen identifies the fault that is active.

Possible Trips and Faults

Atn - Autotuning Active

- Description: The Autotuning function is active. If the first Autotuning fails for any reason, an automatic retry is initiated if "Other Motor" is selected in parameter F413.

db or dbOn - DC Braking Active

- Description: Indicates that the DC Injection function is being applied. "db" is shown during braking, while "dbOn" is shown when the Shaft Stabilized function is active.

Fault Screen Display and Possible Causes

Inverter (VFD) Overload (OL):

- Acceleration time is too short.
- DC Injection current is too high.
- V/f setting needs adjustment.
- Operating while the motor is being restarted.
- VFD or motor is not properly matched with the application.

Autotuning Error:

- Autotuning measurements are inconsistent with configuration information.
- A non-three-phase motor is being used.
- Incorrect settings in parameters F400, F413, or F414.
- A motor with a much smaller value than the VFD is being used.
- VFD output wiring is too small, too long, or located in the same cable tray as other cables, causing parasitic EMF.
- Motor is running during the Autotuning function.

Communication Error (Comm Error):

- Communication failure.
- Incorrect or loose connection.
- Incorrect system settings.

Control Undervoltage (Ctrl Undervolts):

- Low voltage condition in 5, 15, or 24 VDC source.
- Three-phase input voltage is low.

+ Toshiba Q7 User Manual >>

+ Toshiba Q7 Fault index >>

+ Toshiba Q7 Fault codes 2 >>

+ Toshiba Q7 Fault codes 3 >>

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