Electronics > Beginners
Interference Capacitor Substitution
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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