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    When are brake resistors required on AC drives?

    Issue:
    When are brake resistors required on AC drives?

    Product Line:
    Altivar drives

    Environment:
    ATV61 ATV71 ATV312
     
    Cause:

    Installation / Setup

    Resolution:
    AC variable frequency drives are commonly used with a variable speed drive system. For applications that require faster deceleration rates, or where motor speeds are exceeding the synchronous speed set by the output frequency of the drive ( an overhauling load condition), a braking resistor is required. Braking resistors increase the braking torque capability of a variable frequency drive, producing faster and more controlled braking. The resistor dissipates regenerated power to keep the bus voltage from exceeding the rated limit of the drive.
     

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