Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 4, Problem 5RQ
Why is it necessary to permit a solder melting type of overload relay to cool for two to three minutes after it has tripped?
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Understanding Motor Controls
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- When using a rod type float switch, how is the amount float movement required to open or close the contacts adjusted?arrow_forwardWhat happens when the low-voltage current flow in the coil primary winding is interrupted by the switching device? The primary winding delivers a high-voltage spark to the plugs. The magnetic field in the coil primary builds. The secondary voltage drops to zero volts. High voltage is induced in the secondary windinarrow_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
- The load on the outdoor coil influenced by? -The location of the indoor coil -The outdoor temperature and the evaporator heat load -the voltage supplied to the unit -all the above factorsarrow_forwardHeat condition -K-Type thermocouples were placed at multiple locations along the copper rods to mesure temperature. places name and explain the working principle behind a therocouple?arrow_forwardThe colors of the wires of the thermocouple type K are: Select one: a. Green and white. b. Black and white. c. Green and black. d. Brown and white.arrow_forward
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