Can a defective DRC on a heat pump cause the fan motor to go bad?

[Tom.G]

Sneaky!
C= Capacitance
A= Amps
V= Volts
k= 2652

C= kA / V
C= k⋅(A/V) - - - (V/A)= R but it's a capacitor so (V/A)= X_c (capacitive reactance)
but it's not (V/A), it is (A/V) . so (A/V)≡ 1/X_c

C= k⋅(1/X_c)
Now (1/2652) = 0.000377
The formula @jim hardy gave for X_c has 377 in the denominator. Your formula has moved the reciprocal of 377 to the numerator, which has the same mathematical effect. The factor of 1 million difference between the two is because your formula gives the result directly in microfarads, whereas jims formula answers in farads.

Nice shortcut.

I see @Averagesupernova types faster than I do.

Cheers,
Tom

 

[jim hardy]

Aha !

2652 X 2π X 60 = almost a million

copying from Windows calculator

X 2π X 60 = exactly a million

to get from farads to microfarads

If i learn something every day i might know something someday !

old jim

 

[jim hardy]

Capacitance (MFD)= (Start winding amps X 2652)/Volts from start to run

Nice shortcut.

Indeed !
So nice i just had to figure out how a way that i can remember it.
With my scattered brain i'll roll digits

so i wound up back at conductance, the old Mhos trick

$Ohms = \frac{1}{2πfC}$
so $Mhos = 2πfC$
which means $C = Mhos X \frac{1}{2πf}$
but that's in Farads
in Microfarads it's $C = Mhos X \frac{1,000,000}{2πf}$

and since Mhos = Amps/Volts

$C= \frac{Amps}{Volts} X \frac{1.000.000}{2πf}$

and at 60hz, $\frac{1.000.000}{2πf} = 2652.58...$

hence your $C = \frac{Amps}{Volts} X 2652$ , good to four digits which is probably better than the ammeter.

it's easier for me to just remember C = Mhos/2πf
and that's what i'll do

Thanks, Guys,
for showing this old dog a new trick !

old jim

 

[fourthindiana]

Thanks, Guys,
for showing this old dog a new trick !

old jim

You're welcome.