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Old December 12th, 2014, 07:09 AM   #2
Gene Bond
United States

Gene Bond is offline
Join Date: May 2004
Location: Indianapolis, IN
Posts: 410
I've seen it on multiple designs... If the power loss is not long enough for a good fault, the auto-reset doesn't fire, and the drive is left in an alarm or worse.

Quite a few drives require a toggle of the run input to restart. Some have it as an option, to satisfy safety in a plant, but are a PITA in an un-manned, remote application.

One possibility, that works most of the time is to wire a n/o 'healthy' (powered up and no fault) contact in series with the run input.
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