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Motor Starting

Limits for repetitive induction motor DOL starting by electricpete
Posted: 7 Dec 06 (Edited 13 May 13)

The following link gives NEMA recommendations regarding maximum starting frequency and required off time between starts as a function of motor horsepower, speed, and load inertia which apply for NEMA frame motors (typically 250hp or less)

http://www.joliettech.com/allowable_starts-interva...

For large motors, there are no standard repetitive start limits (other than one start hot, two starts cold from NEMA MG1). The following link provides a very detailed description of the considerations which should go into evaluating repetitive starting in general (including for large motors)

http://findarticles.com/p/articles/mi_qa3726/is_20...

As always, specific info from the manufacturer trumps any other info.

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