I supplied a 25HP @ 460 VAC FWD / REV Fuji starter in combination with a MMS (manaul motor starter)for a mixer that is using "plugging" to stop the motor on a small rubber mixer. This is applying reverse voltage at command of stop until the motor reaches zero speed. A zero speed switch detects the motor is at zero speed and removes the reverse voltage to keep the motor from starting to turn backwards.
I used the MMS sized a little large to allow for this but small enough to hopefully protect the motor. I sized the contactors at 40HP at just a guess. It worked fine here at the shop but problems are in the field. Can anyone provide proper engineering information to allow for proper oversizing of components selected to do this job as opposed to my "guess"?
FYI, changing stopping logic is NOT an option.
I used the MMS sized a little large to allow for this but small enough to hopefully protect the motor. I sized the contactors at 40HP at just a guess. It worked fine here at the shop but problems are in the field. Can anyone provide proper engineering information to allow for proper oversizing of components selected to do this job as opposed to my "guess"?
FYI, changing stopping logic is NOT an option.