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Why does the S-Flex with bypass not follow deceleration ramp time and freewheel stops instead?

Published date: 30 July 2019

Issue:
Why does the S-Flex with bybass not follow deceleration ramp time and freewheel stops instead?

Product: 
SFD212, S-Flex with Bypass

Environment: 
All

Cause:
Drive will not follow deceleration time. 

Resolution:
SFD212(S-Flex) with bypass will not follow the deceleration time (DEC). This is because when the stop command is given, the drive output contactor (DOC) drops out immediately, causing the run permissive on the R terminal (F112= 1) to drop out and the motor is no longer connected to the VFD. The motor then coasts (freewheel) to a stop. 

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