Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 27, Problem 3RQ
To determine
The current rating to be used when sizing the overload heaters.
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Understanding Motor Controls
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- The motor nameplate of a wye-delta started motor has a full load current of 287 amperes. What current rating should be used to determine the proper overload heater size?arrow_forwardA large motor has a full load current rating of 425 amperes. Current transformers with a ratio of 600:5 are used to reduce the current to the overload heaters. What should be the full load current rating of the overload heaters?arrow_forwardWhat conditions must be met before two alternators can be paralleled together?arrow_forward
- When energizing or de-energizing a combination starter what safety precaution should always be taken?arrow_forwardIs the resistance in the start winding greater or less than the resistance in the run winding?arrow_forwardA wye-connected load has a phase current of 25 A. How much current is flowing through the lines supplying the load?arrow_forward
- A 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_forwardName two requirements that must be met before a motor can be used for wye-delta starting.arrow_forwardWhat are the advantages of alternators over generators?arrow_forward
- A motor is tripping out on overload. The motor nameplate reveals a full load current of 68 amperes. When the motor is operating under load, an ammeter indicates the following: Phase #1 = 106 amperes, Phase #2 = 104 amperes, and Phase #3 = 105 amperes. What is the most likely problem with this motor?arrow_forwardA motor nameplate indicates an insulation temperature rating of F. What is the temperature rating of this insulation?arrow_forwardHow do you check for an open armature winding?arrow_forward
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