Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Chapter 49, Problem 3RQ
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?
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Chapter 49 Solutions
Industrial Motor Control
Ch. 49 - Prob. 1RQCh. 49 - What is the advantage of a plunger-type voltage...Ch. 49 - A motor is tripping out on overload. The motor...Ch. 49 - A motor is tripping out on overload. The motor...Ch. 49 - Prob. 5RQCh. 49 - Refer to the circuit shown in Figure 4916. Assume...Ch. 49 - Prob. 7RQCh. 49 - Refer to the circuit shown in Figure 49–20. Assume...Ch. 49 - Prob. 9RQCh. 49 - Refer to the circuit shown in Figure 4920. Assume...
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- A motor nameplate lists the voltage as 208–230/460. The nameplate also lists the full-load amps as 34.2–31.6/15.8. If the motor is operated at 240 volts, what should be the full-load current?arrow_forwardAssume that a nine-lead dual-voltage motor is being tested with an ohmmeter. The meter indicates resistance values as follows: T7–T8 = 6Ω, T7–T9 = 6Ω, and T8–T9 = 10Ω. What would these readings indicate?arrow_forwardWhat is the advantage of the capacitor-start induction-run motor over the resistance-start induction-run motor?arrow_forward
- What is the full-load running current of a three-phase, 50-hp motor connected to a 560-volt line? What are the minimum size NEMA and IEC starters that should be used to connect this motor to the line?arrow_forwardWhen a repulsion-start induction-run motor reaches about 75% of rated full-load speed, it stops operating as a repulsion motor and starts operating as a squirrel-cage motor. What must be done to cause the motor to begin operating as a squirrel-cage motor?arrow_forwardWhat is the advantage of a capacitor start induction run motor over a resistance start induction run motor?arrow_forward
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