Electronics > Beginners

Interference Capacitor Substitution

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hgg:
Hi,

My vacuum cleaner died and it turns out that it was the mains cable with multiple
hidden cracks.  It was tricky to find it, because when I opened it I saw the following:



I have already bypassed the capacitor and the vacuum cleaner works again.
The cap had 4 wires.  Two blue and two black.  It was connected between live and neutral.

Its a 0.2uF and two 2400pF XY.
It says Y capacitor but the vacuum cleaner does not have a mains ground.
The capacitor case was bolted on the metal motor chassis. 

Is it just a double capacitor in the same case for interference suppression ?
Hard to find and expensive.   Have you seen anything like that?
Can I just replace it with separate X and Y capacitors ?

Thanks.



wraper:
It's one 0.2uF X capacitor + 2.2n Y capacitors. If you cannot find it in one package, you can replace it with 3 separate capacitors. Earth connection is not required to use Y capacitors. They can be connected to chassis without earth connection.

hgg:
Perfect.
Thank you very much for the diagram!   :-+

What is the purpose of connecting the Y capacitors to the case, since its not earthed?
I do not understand how that works.

wraper:

--- Quote from: hgg on November 04, 2019, 01:45:05 pm ---What is the purpose of connecting the Y capacitors to the case, since its not earthed?

--- End quote ---
Even without ground connection it helps reducing interference.

hgg:
Yes, but where is the interference coupled?
The motor chassis is floating.

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