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Thread: Starting capacitor

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    Gold Member Martinco's Avatar
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    Starting capacitor

    I have a problem whereby the starting capacitor of a pump motor packed up and I need to replace this.
    Specs: 14 Mfd at 400V. I can only locate a 10 Mfd or a 20 Mfd capacitor. Which would be the better replacement and why ?

    Thanks
    Martin Coetzee
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    Diamond Member Justloadit's Avatar
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    Not knowing the application, and making a call like this may be risky. If you do a few starts a day, then use the 20MfD. The higher the capacitance value, the higher current that flows, and the motor will have more starting torque.

    The period in which the start capacitor remains in the circuit is a second or so, so the extra current flowing will not cause any harm.

    However if this motor starts many times an hour, I would suggest you get the correct one. Using the lower capacitance may draw less current in the start winding, but it may also cause the motor to stall due to torque loss, which could cause a burn out.
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    Martinco (06-Dec-10)

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    Gold Member Martinco's Avatar
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    Quote Originally Posted by Justloadit View Post

    The period in which the start capacitor remains in the circuit is a second or so, so the extra current flowing will not cause any harm.

    However if this motor starts many times an hour
    Many thanks, The motor only starts once a day so the 20 MfD would be fine.
    Martin Coetzee
    Supplier of Stainless Steel Band and Buckle and various fastening systems. Steel, Plastic, Galvanized, PET and Poly woven.
    We solve your fastening problems.
    www.straptite.com

    You may never know what results will come from your actions, but if you do nothing, there will be no results... Rudy Malan † 05/03/2011

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    Diamond Member AndyD's Avatar
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    If there is only one cap and it's rated at 400v discharge voltage then it's most likely a run capacitor and not a start capacitor.

    Use a clamp meter on the pump whilst under load and pick the capacitor that gives you the lowest running current. You should be able to find a 15ยตF - 400v cap if you shop around.
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    Martinco (07-Dec-10)

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    this sounds like a pool pump motor?

    what size is the pump motor?

    what is the application...if it is a pool pump motor i can only assume you think the cap has gone because the motor makes a humming sound when you try start it?

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    Martinco (07-Dec-10)

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    Gold Member Martinco's Avatar
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    Quote Originally Posted by murdock View Post
    this sounds like a pool pump motor?

    what size is the pump motor?

    what is the application...if it is a pool pump motor i can only assume you think the cap has gone because the motor makes a humming sound when you try start it?
    Hi Murdock, Andy

    Actually a jacuzzi pump motor @ 1/4 hp and yes, it made a humming sound when trying to start. If you spin it by hand it does start and runs fine.
    I have put the 20 Mfd cap in and the motor starts 100% and still runs cool. ( I left it running for +- 30 min.)
    So, the problem has been canned and my wife can enjoy her jacuzzi again.
    Martin Coetzee
    Supplier of Stainless Steel Band and Buckle and various fastening systems. Steel, Plastic, Galvanized, PET and Poly woven.
    We solve your fastening problems.
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    You may never know what results will come from your actions, but if you do nothing, there will be no results... Rudy Malan † 05/03/2011

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    next step...trade test and you are smokin

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    Gold Member Martinco's Avatar
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    Quote Originally Posted by murdock View Post
    next step...trade test and you are smokin
    Hmmmmmmm, by looking at your threads/posts, I am not so sure !
    Martin Coetzee
    Supplier of Stainless Steel Band and Buckle and various fastening systems. Steel, Plastic, Galvanized, PET and Poly woven.
    We solve your fastening problems.
    www.straptite.com

    You may never know what results will come from your actions, but if you do nothing, there will be no results... Rudy Malan † 05/03/2011

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    my apologies if you feel i am targeting you...it is not my intention.

    after reading the post again i can see why you would think so

    i can ask dave to remove it... unfortunelty the 20 minutes is up so i cant edit.

    by the way i am happy with my wife and dont have any desire to look at other peoples wives.

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    Gold Member Martinco's Avatar
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    Quote Originally Posted by murdock View Post
    my apologies if you feel i am targeting you...it is not my intention.

    after reading the post again i can see why you would think so
    Hey Dude, I am pulling your leg !

    No offence taken.
    Martin Coetzee
    Supplier of Stainless Steel Band and Buckle and various fastening systems. Steel, Plastic, Galvanized, PET and Poly woven.
    We solve your fastening problems.
    www.straptite.com

    You may never know what results will come from your actions, but if you do nothing, there will be no results... Rudy Malan † 05/03/2011

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