| 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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