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Thread: concept of braking in VFDs

  1. #31
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    Quote Originally Posted by Abhi View Post
    Can anyone please give me study material for ac drives in which topics such as construction, working principle, components used.
    and more details such as how much voltage DC bus has during motoring and braking process for a 3 phase 415VAC.

    and how much threshold voltage is set in DC bus beyond which extra energy is dissipated.

    I have ABB manual but dont have such details in it.

    this is the text we used
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    The difference between genius and stupidity is that genius has its limits.

  2. #32
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    Quote Originally Posted by GoldDigger View Post
    Generically, a "watchdog" circuit is a fail safe output that changes state when the control or output circuitry or program is not working properly. In processor-based systems it is often used to hard reset the processor in the hope of recovering from a glitch or bug. In the case of a drive, it is likely to indicate that it is not safe to rely on the drive.
    sometimes it refers to a software block that monitors data comm (modbus, ethernet, etc) between say a vfd and plc
    if comm or 'heartbeat' is lost the vfd is shutdown, etc
    The difference between genius and stupidity is that genius has its limits.

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