Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 4, Problem 3RQ
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Identify the two major types of thermal overload relays.
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Understanding Motor Controls
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- Why is it necessary to permit a solder melting type of overload relay to cool for two to three minutes after it has tripped?arrow_forwardWhat two factors determine the amount of voltage produced by a thermocouple?arrow_forwardWhat pin numbers are connected to the coil of an 8-pin control relay?arrow_forward
- List some of the protective relays found with large transformers.arrow_forwardWhat is the principle of operation for most externally mounted overload protection devices?arrow_forwardA three-phase motor nameplate indicates a full load current of 362 amperes. The nameplate indicates that the heaters are to be sized for 125% of motor full load current. Current transformers with a ratio of 600:5 are used to reduce the motor current. Using the chart shown in Figure 4–7B, determine the size of overload heaters needed to protect this motor.arrow_forward
- Why are the contacts of a micro switch spring loaded?arrow_forwardAn 11-pin control relay contains three sets of single-pole double throw contacts. List the pin numbers by pairs that can be used as normally open contacts.arrow_forwardExplain the difference between cumulative- and differential-compounded connections.arrow_forward
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