VFD deceleration issue - PLEASE HELP ! - Page 3
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  1. #41
    Join Date
    Jun 2001
    St Louis
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    Quote Originally Posted by beckerkumm View Post
    does the fact that a 4 pole motor has twice the torque of a similar hp 2 pole motor factor into the additional time needed to decelerate? Dave
    You would not think so, deceleration is really just negative torque. So it should not be an issue.

    I'm wondering if the drive had a "no trip" current limit capability, and that was the setting used.... Then the drive would tend to hold at the current limit, and in the case of deceleration, that could "very significantly extend" stopping time.

    I'd have thought that a plain "coast to stop" would be faster than a minute. But, if the load had enough inertia to coast more than a minute, that may be a pretty good clue as to the basic issue. Still does not explain the stop time difference in two motors....

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