January 2010
Intermediate to advanced
512 pages
18h 35m
English
Content preview from Electrical Codes, Standards, Recommended Practices and Regulations
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Full-voltage, two-speed motor controllers are available in two motor-winding
configurations:
Single-winding two-speed motors
Two-winding two-speed motors
Because of the potential for short-circuit-induced currents in any unused portion of a delta
configured motor winding, the controller must be designed to open one corner of each unused
delta winding not operating in the circuit.
NEMA ICS 2 establishes the range of operating voltages for contactor/controller coils. AC
controller coils should be capable of operating without sustaining damage between 85% and
110% of their rated voltage. It also requires that should a control-circuit transformer be used to ...
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