Kenwood Chef capacitors advice needed.

The caps you've mentioned are rated 250V DC. You need a capacitor continuously rated at 250VAC. Maplin do some X1 and X2 though I have to claim some ignorance of the differences between Y2(X1) and X2. I thought it was only Y caps which were suited for use between phase and earth!

cheers

CPC do them, although there's a small order charge. 150nF values are listed, and many others.

Bought some a couple of weeks ago when the same thing happened to SWMBO's knitting machine.

You can sub 250v ac caps with 400v dc caps. If these are across L/N you should pick X rated caps to conform tot he latest regs (the originals in an old Kenwood wont be x rated) and for L-E caps they should be Y rated. You should find something suitable from any component supplier.

Re cap values, it depends what each one does. In some cases its critical, in some far from.

NT

Is her machine a Brother? And do you know if CPC would have the fuses required for the Garter carriage?

Sheila

Replied offline.

Brother 950. It sems to be a VERY common problem.

I got some fuses for the 950 power supply board (next to the capacitors). Do you know what the fuse rating is for the garter carriage? She has one, so I could look tonight...

Reply privately to snipped-for-privacy@eager.cx ..

Not always.

First of all its not 400, its 415-440v peak

Secondly, capacitors are normally designed to block DCV, and allow slow power higher frequencies through: They may not cope with full high power AC waveforms..they can get hot and explode in a puff of white smoke, especially the larger capacities that will pass substantial current.

Thirdly if its an electrolytic, it can't take ANY reverse voltage AT ALL without going up in a spectacular puff of smoke, and a decent sort of bang.

I'd stick to outside toilets and lime plaster if I were you,.

We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember S Viemeister saying something like:

No, but it's slightly smoke coloured and popped a cap in its ass.

My goodness, what a witty little boy you are.

We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember S Viemeister saying something like:

Not my fault if you're too thick to appreciate humour.

You are a dunce, picking this one. This is one subject I have a good deal of expertise in, and what you say is variously not relevant to this case or not correct.

BTW since I dont know the OP, are you sure these are caps and not CR suppressors?

NT

Er..well its one subject I have TOTAL experience in, and professional qualifications to boot. Plus about 30 years experience designing electronics.

Indeed. For a start, those values are unlikely to be electrolytics. All the ones I've seen are polyester.

Well, he gave a uF rating for them, although I agree it's not clear cut.

if so you'll know why what you said is not relevant to this case.

NT

especially on ac mains

Yes. CR suppressors are marked with uF though, as are CLC filters. It also strikes me as more likely a suppressor value than a motor run cap value.

NT

It's not often I'm critical of advice here but when someone claims they have

The OP needs to make sure that the caps he gets are appropriately rated for mains.

There are indeed, but one would probably not use one for 150nF.

Including spikes..