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MCT8329A: How to achieve a smooth start

Ron Wilton
Prodigy 70 points
Part Number: MCT8329A

Tool/software:

Hello

I am driving a 48 V motor with an MCT8329A gate driver on a custom board. The speed of the motor is controlled by the user using a footpedal.

The MCT8329A is configured to:
- use IPD
- drive the motor with a PWM signal
- run in the Speed Loop
- use the linear profile
- drive the motor at a max 200 Hz, 12,000 RPM

When the pedal is pressed the nFAULT line is usually tripped, a 'CBC_ILIMIT fault detected' is shown in the CONTROLLER_FAULT_STATUS register (The GATE_DRIVER_FAULT_STATUS register showing 0x00000000), and a jolt is felt.

I've tried changing the various settings in the MOTOR_STARTUP1 EEPROM that relates to the IPD start up and MOTOR_STARTUP2 that relates to the Open loop, without much obvious change in behaviour (other than making things worse).

We are wanting to have a smooth start up. Any ideas on how to achieve a smooth start up, please?

Thanks

  • 0
    TI__Mastermind 21426 points

    Hi Ron,

    Thanks for your questions! Yesterday was a holiday in the US and there are a few team members out of office today, but we will aim to get back to you next week.

    Regards,

    Anthony Lodi

  • 0
    TI__Expert 8640 points

    Hi Ron Wilton, 

    Is it possible to share the current limit specification, JSON file?

    What is the Value of Shunt resistor used?

    Open Loop acceleration, Closed Loop acceleration, Deceleration are configurable. Device need to be configured to deliver the rate until we obtain satisfactory performance.

    MOTOR_STARTUP2 [OL_ILIMIT], CLOSED_LOOP1[CL_ACC], CLOSED_LOOP2[CL_DEC] etc.

    Thanks and Best Regards,

    Venkatadri S