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 Amps, Phase #2=104 Amps, and Phase #3=105 Amps. The motor has been in service for six months. What is most likely the problem? motor winding is bad ambient temperature is too high and the overload needs to be adjusted to account for that overload setting is too low bearing is bad or the load is too heavy

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 Amps, Phase #2=104 Amps, and Phase #3=105 Amps. The motor has been in service for six months. What is most likely the problem? motor winding is bad ambient temperature is too high and the overload needs to be adjusted to account for that overload setting is too low bearing is bad or the load is too heavy

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 2PA: You have been given the task of connecting a nine-lead three-phase dual-voltage motor to a 240-V...

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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 Amps, Phase #2=104 Amps, and Phase #3=105 Amps. The motor has been in service for six months. What is most likely the problem?
You are an electrician working in an industrial plant. A 30-hp three-phase squirrel- cage motor keeps tripping out on overload. The motor is connected to a 240-volt line. Voltage measurements indicate the following voltages between the different phases: A-B = 276 volts, B-C = 221 volts, and A-C = 267 volts. Determine the percentage of heat rise in the winding with the highest current.
please answer asap A 40Kw motor with a heating time constant of 120 minutes has a final temperature rise of 60 degree Celsius on continuous rating. Determine half hour rating for same temperature rise. Motor has maximum efficiency of 80% of full load
A single-phase electric motor is connected to a 240-volt, 30-ampere circuit. The motor nameplate indicates that the full-load current draw of the motor is 21 amperes. The motor is connected to an inertia load (a large flywheel) that requires several seconds for the motor to accelerate to full speed. Because of the long starting time, the motor causes the circuit breaker to trip before the load has reached full speed. Your job is to connect a resistor in series with the motor during the starting period that will limit the starting current to 90% of the circuit-breaker rating. An ammeter indicates that the motor has a current draw of 64 amperes when power is first applied to the motor. Determine the ohmic value and wattage rating of the resistor that should be connected in series with the motor during the starting period.
Two shunt generators and a battery are all connected to common bus-bars. The open circuit voltage of the battery is 247 V. The open circuit voltage, armature and field resistances of the generators are 250 v, 0.12 ohms and 100 ohms respectively. Both the generators supply the same current when the load on the bus-bars is 40 A. Calculate the internal resistance of the battery. ANSWER ASAP!
I have a 230/460 volt motor, rated 1140 rpm at 60 hz. can you please tell me the number of poles and the rated KW? thanks
You have been given the task of connecting a nine-lead three-phase dual-voltage motor to a 240-V line. You discover that the nameplate has been painted and you cannot see the connection diagram. To make the proper connections, you must know if the motor stator winding is connected wye or delta. How could you determine this using an ohmmeter? Explain your answer.
SHOW YOUR COMPLETE SOLUTION, ANSWER MUST BE IN 2 DECIMAL PLACES. SHOW WHAT IS GIVEN AND WHAT IS THE UNKNOWN. A 20KW short shunt generator with a terminal voltage of 250V has armature, series and shunt field winding have resistances of 0.05 ohms, 0.03 ohms and 100 ohms respectively. Calculate the total voltage generated in the armature when the brush drop is 1 V per brush and the feeder resistance is 0.5 ohm.
Calculate the efficiency of motor at different loads
The fuse in one of the supply phases of a running 3-phase I.M. blows off. Will the motor continue to run at ( i) original speed (ii) reduced speed (iii) come to stand still?
17. An a-c hoist motor has the following duty cycle: acceleration, 110 amp for 8 sec; constant speed, 60amp for 18 sec.; lowering and braking, 20 amp for 10 sec; and the rest, 0 amp for 5 sec. The current ratingfor this motor isA. 76.56 amp.B. 69.64 amp.C. 74.09 ampD. 78.29 amp
Branch-circuit conductors supplying a single continuous-duty motor shall have an ampacity not less than _____ rating A. 125% of the motor’s nameplate current B. 125% of the motors full-load current as determined by 430.6(a)(1) C. 125% of the motor’s full locked-rotor D. 80% of the motors full-load current.

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Delmar's Standard Textbook Of Electricity

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		motor winding is bad
		ambient temperature is too high and the overload needs to be adjusted to account for that
		overload setting is too low
		bearing is bad or the load is too heavy