- #1

ovoleg

- 94

- 0

## Homework Statement

Fan Motor Output: 0.172 kW

Propeller Fan

Compressor Motor Output: 2.9kW

DC Inverter-driven Scroll

Voltage: 208/230, single phase

What I need to find is the FLA for each fan motor(2), and the FLA of the compressor motor.

Total MCA = 32A

## Homework Equations

V=IR?

I'm not really sure, no other information is given.

## The Attempt at a Solution

I'm pretty sure it goes something like this but I can't find any resources that would help me calculate this. I've taken electric circuits in physics and in electrical engineering but I do not recall.

P=V*I

P=V*I*eff*PF

Going to assume the power factor = 0.8

I have no clue as to the efficiency, and I'm going to guess that its incorporated into the power factor?

For the Fan,

0.172*10^3=230*FLA*.8

FLA = 172/(230*0.8)

FLA = 0.934783 Amps.

For the compressor I'm going to make generally the same assumption, that the power factor is 0.8 and that I have no clue as to the efficiency.

FLA = 2900/(230*0.8)

FLA = 15.76087 Amps.

So since the MCA is set to 32 Amps, I'm going to at least double check,

(Compressor FLA)*1.5+(Fan FLA) = MCA

^^Pretty sure this is the equation

(15.76087)*1.5+(0.934783) = 24.57 MCA

Obviously not 32. Anyone?