start/run capacitors

Discussion in 'General Electronics Chat' started by mjkonzie, Nov 27, 2010.

  1. mjkonzie

    Thread Starter New Member

    Nov 27, 2010
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    hey,
    I have a 1/2 hp wood turning lathe motor. The 24uf 250 volt 60hz motor cap is shot, hard to find, and now disconnected from the circuit.
    Question: the motor now runs fine it seems. Will there be a problem just putting the motor back in place now or will it consume much more power, or worse yet burn up the motor?.
    If it starts and runs w/o the cap, why is it even there?
     
  2. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
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  3. mjkonzie

    Thread Starter New Member

    Nov 27, 2010
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    so.....it's ok to just put the motor back in place and use it? I also don't want it to consume lots more power or electricity on my meter. been searching everywhere for this specific capacitor, but nowhere can i find an exact rating. 1-100uf is not 24. and it says its a 250 volt but plugs into 110vac outlet. sorry, i am ignorant, just want this to work without costing me much.
     
  4. mjkonzie

    Thread Starter New Member

    Nov 27, 2010
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    oh and thanks "thatoneguy" for the reply. i did read the post prior, and believe me, alot of this is doctor/lawyer jargon to me.
     
  5. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
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    250V is the maximum rating, 120VAC current peaks over 170V, typically 50%-100% of max voltage is used for the rating.

    24uF isn't a standard value.

    22uF/250V caps are 75 cents or so at DigiKey.

    I like to keep equipment completely working, meaning all original components when it comes to expensive tools. That's just me though.
     
  6. mjkonzie

    Thread Starter New Member

    Nov 27, 2010
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    thanks again,
    so its a cbb60 blue cap, 2 wires off top. says 24uf +- 5% 250v ac50-60.
    a 22uf cap 250v would be ok then? sorry again too, thought i read somewhere today that its the uf thats important to be exact. i realize i may have misunderstood, just want it to be ok. like you, i like to keep things the way they were. i will be checking that site for caps though
    thanks again
     
  7. SgtWookie

    Expert

    Jul 17, 2007
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  8. marshallf3

    Well-Known Member

    Jul 26, 2010
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    Not hard to find a 22 uF cap 340 VAC cap at any HVAC supplier.

    They really do need to be rated for dealing with live mains.
     
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