220V Compressor not working at home





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  1. #1
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    Default 220V Compressor not working at home

    Need some help from the Electric Guru's.

    Bought a 1.8KW (2.5Hp) 100 litre direct drive compressor from Builders to use at home. Sometimes it runs, other times it makes a humming sound and battles to turn (Run).
    Went back to builders and they plugged it in and it ran fine. Switched on about 8x times with no problems.

    Get back home and again it switches on sometimes other times just a loud humming sound.
    Back to builders and now insisting they send it back to supplier. Supplier checks and test and finds no problem.

    Back at home still same problem. Take it to a mates house and also same problem. Sometimes starts, other times only humming.
    We then plug it into the generator (5.5KVA 230V) and runs like a dream. Starts without a glitch and runs smooth.

    So the conclusion is that it is not happy with the Eskom 220V at home. 220AC at home measures around 216V and at mates house 218V.

    Wii changing the run Capacitor (40MFD 450V) on the motor make a difference, or do I call it a day and return back to Builders.
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    Default Re: 220V Compressor not working at home

    Just sounds like a bad cap.I don't think it's voltage related though.
    What does the oil level look like?
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  3. #3
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    Default Re: 220V Compressor not working at home

    Oil level 100%

    Brand new.
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    Default Re: 220V Compressor not working at home

    Quote Originally Posted by Tsotsi View Post
    Oil level 100%

    Brand new.
    I will not bother with a new cap. Take it back for a refund/replacement. Item not working as intended.

  5. #5
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    Default Re: 220V Compressor not working at home

    Have you tried it at home in different temperature situations. In the garage it might not start because it cold. Take it outside leave it in the sun for 30min and then try again. Might be to do with the resistance of having to start the motor.
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  6. #6
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    Default Re: 220V Compressor not working at home

    In the mornings it seems to start no problem. During the day/afternoon it does not. Thinking it is load on the AC grid.

    Strange thing is that at Builders in their office no problem. Running of the Generator also no problem.

    Even loosened the hose from the pump to the tank and it still won't start.

    The idea was to maybe run a slightly lower Cap and see if it will compensate.


    Just worried that even if they replace/refund I might have the same problem with another unit.
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  7. #7
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    Default Re: 220V Compressor not working at home

    Had the same with an Adendorfs compressor, it is very sensitive to voltage supply, it does not like running of extension leads etc.

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  9. #8
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    Default Re: 220V Compressor not working at home

    I will also put my money on low voltage. Single phase starting currents are 4 to 5 times full load running current.

    Try running it on a plug closer to your DB. If you can, measure the voltage while it's trying to start it. My bet is that a replacement will do exactly what yours is doing.

    You could also try another capacitor - try and borrow one from a shop selling spares for testing


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    Default Re: 220V Compressor not working at home

    Yep low voltage causes all types of crap, we had as low as 200vac at one stage and I had endless issues. If the neighbour also has low voltage, it will be the transformer. Log a call.....unless you are illegally connected or in an area that has this type of connection.
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    Default Re: 220V Compressor not working at home

    Our house is one of the old houses and still has 3-Phase connection into the house. From there we are connected to single phase.


    Just wondering if changing the value of the run Capacitor would make a difference. I have this feeling that I would have the same issue with another compressor as well.

    Will get someone to do a temp plug at the DB board and try.
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    Default Re: 220V Compressor not working at home

    Good heavens! Is that DB still legal?
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  13. #12
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    Default Re: 220V Compressor not working at home

    Quote Originally Posted by Pieterk View Post
    Good heavens! Is that DB still legal?
    Agree, time to rewire, the voltage drop across phases will be huge.
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  15. #13
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    Default Re: 220V Compressor not working at home

    Quote Originally Posted by Pieterk View Post
    Good heavens! Is that DB still legal?
    Definitely antique. We still have electric cables running between the lamp posts in the area!
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  16. #14
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    Default Re: 220V Compressor not working at home

    Quote Originally Posted by Tsotsi View Post
    Need some help from the Electric Guru's.

    Bought a 1.8KW (2.5Hp) 100 litre direct drive compressor from Builders to use at home. Sometimes it runs, other times it makes a humming sound and battles to turn (Run).
    Went back to builders and they plugged it in and it ran fine. Switched on about 8x times with no problems.

    Get back home and again it switches on sometimes other times just a loud humming sound.
    Back to builders and now insisting they send it back to supplier. Supplier checks and test and finds no problem.

    Back at home still same problem. Take it to a mates house and also same problem. Sometimes starts, other times only humming.
    We then plug it into the generator (5.5KVA 230V) and runs like a dream. Starts without a glitch and runs smooth.

    So the conclusion is that it is not happy with the Eskom 220V at home. 220AC at home measures around 216V and at mates house 218V.

    Wii changing the run Capacitor (40MFD 450V) on the motor make a difference, or do I call it a day and return back to Builders.
    Chat to your supply authority to tap up the transformer voltage. I like to keep our voltages between 230 to 240 volts AC.
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