Spot welder capacitor blew up

[shanedev93]

Spot welder capacitor blew up should just replacing them fix it? The board is very dirty gonna remove it and clean it an see if I notice anything wrong that could cause this issue.
Video of the smoke show
https://youtube.com/shorts/AFJgRbsHGhs?feature=share

[stj]

Re: Spot welder capacitor blew up

no, dont risk it.
clean the board up and post pictures.
if a diode went short-circuit and hit the cap with AC that would do it - and do it to the replacement too!

[redwire]

Re: Spot welder capacitor blew up

It kinda looks like a Rifa

[Per Hansson]

Re: Spot welder capacitor blew up

Yea that is a Rifa capacitor, just replace all of them with the same values.
Just look for the safety rating of it and replace with the same or better Y or X class capacitor.

[shanedev93]

Re: Spot welder capacitor blew up

yes its a RIFA a quick google they seem to be famous lol

best way to clean this board? im using iso alcohol and a brush but it seems to be just moving it from one place to another

[shanedev93]

Re: Spot welder capacitor blew up

this is the same as mine is it ok to use these? or is there a better equivalent?

https://uk.rs-online.com/web/p/film-...B&gclsrc=aw.ds

[stj]

Re: Spot welder capacitor blew up

what is on the side of the old one?

[eccerr0r]

Re: Spot welder capacitor blew up

Yay yet another RIFA thread!
Was really hoping not...but sounds like my Tektronix scopes need to get it's RIFAs swapped soon...

Sure hope the Kemet buyout made them better...

[shanedev93]

Re: Spot welder capacitor blew up

same as the above link above

[redwire]

Re: Spot welder capacitor blew up

There is more info written on the side of the Rifa capacitors, the top just says 0.1uF. They're X caps I guess 300VAC or more.
You would need the lead spacing mm and voltage rating to find replacements.

For cleaning the board, I use a gentle toothbrush and a little compressed air- not too much which makes static electricity and damages things.
The welder has had a hard life, between the rust/water and dust.

[shanedev93]

Re: Spot welder capacitor blew up

There is more info written on the side of the Rifa capacitors, the top just says 0.1uF. They're X caps I guess 300VAC or more.
You would need the lead spacing mm and voltage rating to find replacements.

For cleaning the board, I use a gentle toothbrush and a little compressed air- not too much which makes static electricity and damages things.
The welder has had a hard life, between the rust/water and dust.

ive ordered the ones in the link above they look to be the same to me

[Per Hansson]

Re: Spot welder capacitor blew up

best way to clean this board? im using iso alcohol and a brush but it seems to be just moving it from one place to another

The only way to get this board clean would be with soap and water.
I would not submerge things like the buzzer or relay though.
So best to use maybe a toothbrush and be quite liberal with it, but not submerge it fully...
You can then wash that off with the IPA and after drying it should look much better

[redwire]

Re: Spot welder capacitor blew up

I would not use Rifa/Kemet PME261's as replacements, the one you picked is ordinary PME261 "General Purpose AC/DC, Metallized Paper" and has no ratings for across the line use. Those are another part number PME271M or PME271E.
Rifa oddball sizes are the only LS=20.3mm parts, but I would stuff in a standard 22.5mm part which would fit.

The reason to worry about it is there is no fuse for these and they would totally destruct the board in fire.

[shanedev93]

Re: Spot welder capacitor blew up

The only way to get this board clean would be with soap and water.
I would not submerge things like the buzzer or relay though.
So best to use maybe a toothbrush and be quite liberal with it, but not submerge it fully...
You can then wash that off with the IPA and after drying it should look much better

i used a tin of electrical component cleaner had lots of pressure worked rather well

[shanedev93]

Re: Spot welder capacitor blew up

I would not use Rifa/Kemet PME261's as replacements, the one you picked is ordinary PME261 "General Purpose AC/DC, Metallized Paper" and has no ratings for across the line use. Those are another part number PME271M or PME271E.
Rifa oddball sizes are the only LS=20.3mm parts, but I would stuff in a standard 22.5mm part which would fit.

The reason to worry about it is there is no fuse for these and they would totally destruct the board in fire.

i just got the ones in the link as i have no clue of a suitable replacement lol
they look the same have the same part number pme 261 jc and they seem to work. have you got a link to what you would you use? might change them in the future