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Why are there four motor contacts for high and low speeds in figure 31-4?

Why are there four motor contacts for high and low speeds in figure 31-4?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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31. Why are there four motor contacts for high and low speeds in figure 31-4? L1 L2 L3 T2 T3 H. Two-Speed Motor T11 H. T12 T13 Contral Transformer Low Stop TR OL OL CA CR TR TR High CA CA TR O, 31-4 Autcmatic speed control for a two-speed, two winding three-phase motor.
Transcribed Image Text:31. Why are there four motor contacts for high and low speeds in figure 31-4? L1 L2 L3 T2 T3 H. Two-Speed Motor T11 H. T12 T13 Contral Transformer Low Stop TR OL OL CA CR TR TR High CA CA TR O, 31-4 Autcmatic speed control for a two-speed, two winding three-phase motor.
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