8uF insted of 9uF run capacitor

Discussion in 'General Electronics Chat' started by rjnkanwal, Oct 24, 2015.

  1. rjnkanwal

    Thread Starter New Member

    Oct 24, 2015
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    0
    Hi
    I need help with run capacitor. I have a zanussi tumble dryer 250volt 2800watt.. Capacitor was dead, so ordered a new capacitor(wrong one) direct from Zanussi, which is 8uF 425/475 volt rating with -2% and +8% tolerance. The actual capacitor in the tumble dryer is 9uF with similar rating and tolerance. I replaced it anyway just to test if it runs.
    It does work but I am worried that can it do some damage in the long run as it is 8uF instead of 9uF.
    So if someone can advise me that should I keep using it or should I replace it with the 9Uf.
    Thanks.
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,987
    745
    The tolerance will allow it to run ok,

    8uF +8% is about the same as 9uF -2%
     
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  3. rjnkanwal

    Thread Starter New Member

    Oct 24, 2015
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    Thanks Dodgydave.
    My calculation made 8uF with +8% 8.64 and 9uF with -2% 8.82. It is close but still little difference.
     
  4. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    If it starts reliably, then dont worry about when it runs. The reactance of the 8uF is higher, so the current in the motor winding will be less than it would have been with 9uF. Motor will run cooler; not hotter.
     
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  5. rjnkanwal

    Thread Starter New Member

    Oct 24, 2015
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    Thanks MikeML. I used it twice today for 3hours and it is working fine.
     
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