Motor Problems KEY.325

Motor Problems KEY.325 - Name_ AGSM 325 Motor Problems Key...

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Name____________________________________ AGSM 325 Motor Problems Key MOTOR CALCULATION PROBLEM 1. Given: Your maintenance staff wants to know if a particular water pump and 60 Hp motor is overloaded because its full load amps are 73 and measured amperage averages 77.5 on the 3 phases. They want to know if the motor is overloaded and in danger of burning up? They provide you the following information from the motor and measurements they performed: Motor Nameplate Data: 60 Horsepower, 3 phase, Volts = 460, FLA=73, Eff= 0.9, Service Factor = 1.15. At Pump Panel: Phase A Phase B Phase C Average Voltage 470 471 474 471.1 Amperage 76.7 76.5 79.4 77.5 Power Factor 0.80 0.86 0.83 0.83 a. Calculate the maximum output power (HP & kW) before this motor is overloaded. 60 hp X 1.15 = 69 Hp 69 hp X 0.746 = 51.47 kW b. Calculate the maximum input power (HP & kW) before this motor is overloaded. 69 hp / .9 = 76.7 Hp 76.7 hp X 0.746 = 57.2 kW c. What is the actual input power to this motor (HP and kW)? W = 471.1 X 77.5 X 0.83 X 1.74 = 52,728 watts = 52.7 kW =
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Motor Problems KEY.325 - Name_ AGSM 325 Motor Problems Key...

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