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Motor connection tips for avoiding costly mistakes

Publication: 
Control Engineering
Publication date: 
August 2016
Author: 
Mike Howell, EASA Technical Support Specialist

Manufacturers deploy various external connection schemes to produce three-phase induction motors for multiple voltages and/or starting methods, so successful installation depends on using the relevant connection diagram. If this information is lost, damaged, or ignored, a connection mistake could lead to a costly rewind.

The following tips apply to common connections on machines with one speed at power frequency. If the manufacturer's external connection diagram isn't available, ask a service center for assistance, especially if there are several missing lead tags, multiple speed ratings at power frequency, unconventional numbering, or NEMA-IEC cross-references.