Parallel Capacitor Circuit

sam_sam_sam

Hi EveryOne

Could any please explan to me why you would have two RUN Capacitor on a

Compressor Circuit the value is CAP1 30 MFD @ 370 Volts CAP2 30 MFD @ 370 Volts

Now they make a 60 MFD @ 470 Vols is it because of the voltage that they are doing this

because 370 + 370 = 740 Now These Units run on 220 Volts now this is only on some units

I would like to THANK any one who could explan this to me

You see this in some A\C units

Sam

Newzed

The allowable voltage across capacitors is the voltage rate of the lowest voltage-rated capacitor.· For example, the allowable voltage across a 470 volt, a 1000 volt and a 100 volt is 100 volts.

The allowable voltage across capacitors in series is the sum of all the voltage ratings.· For example a 470 volt, a 1000 volt and a 100 volt in series would have a voltage rating of 1570 volts.

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Sid Weaver
Do you have a Stamp Tester yet?
http://hometown.aol.com/newzed/index.html

·

PJAllen

OK, capacitors in series are like resistors in parallel.· Similarly, capacitors in parallel are like resistors in series.

The voltage ratings of capacitors in series isn't exactly additive.· If they are of the same rating, then they do "add."· If they are of different ratings, then the chain is only as good as its weakest link (or lowest rated voltage.)

Consider an RC low-pass filter and the capacitance is comprised of two capacitors of the same value (2x 0.1uF for equiv. 0.05uF) and·different ratings (one 50V and one 150V).· If the output amplitude was 200V, the X_C of each being equal, there would be 100vac across one of the caps and 100vac across the other (not good.)

sam_sam_sam

Hi EveryOne

Thanks PJ Allen and Newzed for explaining this to me


Sam