[TheForge] motor and capacitor

[CGRAF]

I have one microfarad reader, a dedicated one just MFD reading, I was 
figuring he would not likely have that. Ohming it out only tells you if 
the cap is burned out or not. It is a useful field test when trouble 
shooting.

Mike Graf

On 12/3/2014 9:09 PM, Cindy wrote:
> If you have a meter with microfarad function, you can check the mfd the
> capacitor is putting out.  Generally, the cap will state the mfd and its
> tolerance in percentage (+/-), usually 5-10%.  Capacitors are the first
> thing to check when you look at motors not starting, etc., and the
> cheapest to fix if they are out.  Usually less than $10 or so.  An air
> conditioning supply house is a good source for caps and probably will
> have what you need and the price will be fair.  Replace if out of
> tolerance either up or down.
>
> I keep all the old caps I pull off motors if 1 side is within
> tolerance.  even if 1 side is bad, you can use the other side. I write
> on them what the mfd is.  then when I need one, I go dig thru my pile
> and see if something is ok to use.  some will say 330 volt, others 440
> or whatever, ok to go w/ a higher number on volts but not lower.
>
> some have 2 caps in one, you will have to ck between common and the
> start and run side (in HVAC that's fan and hermetic).  i don't see many
> start caps anymore but that is probably what you have on this little motor.
>
> one caution, if a cap is charged, it can shock you if you short it out.
> it (the charge) can be drained by hooking a resistor between terminals.
> just do NOT use a screwdriver to short it as you may ruin the capacitor.
>
> James
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