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What happens when there is a freewheel stop on an Altivar 58?

A logic input can be assigned to the Freewheel Stop / Run Permissive (NST) function. The drive controller will not run until the logic input is closed. Opening the logic input assigned to the function (setting it to state 0) causes the drive controller to stop applying power to the motor and the motor to coast to a stop. When the logic input is open, NST is displayed in the Drive state screen on the keypad display to indicate that a freewheel stop has been requested. The drive controller will not run until the logic input is closed.

This can be used with or without the Forced Local function for drive controllers on communication networks.

A freewheel stop can be used with a stop command and by setting the FFt parameter. When a stop command is given and the frequency drops below the frequency set with the FFt parameter, the drive controller will freewheel stop.


CTA-ID : 6849
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