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Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818

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BuyFindarrow_forward

Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 7, Problem 5SQ
Textbook Problem
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Why does the coil (CR) in Figure 7–19 drop out when the thermostat touches the open position?

To determine

Explain the reason for CR coil drop out in Figure 7-19 when thermostat touches the open position.

Explanation of Solution

Discussion:

Thermostat relays are three-wire, gauge-type control with a slowly moving element, which makes contact with close and open positions of the relay. It is used between the starter and thermostat control.

Refer Figure 7-19 in the textbook for starter coil (M) that is controlled by a thermostat relay.

When the thermostat touches the open position, the current flow in the coil bypasses through a small resistance that leads the relay (CR) coil to open...

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