Author Topic: Big caps Rattle - Advice needed  (Read 861 times)

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Offline ColdPowerTopic starter

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Big caps Rattle - Advice needed
« on: September 17, 2021, 12:35:44 pm »
Hello everyone,

it's been my understanding since forever, that if a cap rattles, this can't be good and I always would replace immediately. Have had hundreds of smaller snap-in rattlers replaced, but I just got a brand new Nichicon of series I haven't used before and it has a slight rattle from inside. Anyone used these and noticed this. Could that possibly be normal for them?  :-\
 

Offline amyk

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Re: Big caps Rattle - Advice needed
« Reply #1 on: September 17, 2021, 01:23:24 pm »
That usually means the capacitor roll is smaller than the can. I would check capacitance and ESR, if it's normal then it might not be a problem.
 

Offline madires

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Re: Big caps Rattle - Advice needed
« Reply #2 on: September 17, 2021, 02:07:07 pm »
Measuring is a good advise. Also check the voltage rating. Might be a fake.
 

Offline ColdPowerTopic starter

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Re: Big caps Rattle - Advice needed
« Reply #3 on: September 17, 2021, 04:08:59 pm »
Thanks for the suggestions. The cap measures perfectly fine, but so do a whole box of few hundred old caps that I have, most of which rattle and measure okay. And for those I definitely know they shouldn't rattle when new. So I wouldn't rely on measurement alone, I'm more curious if that's at all possible to be normal for the type or indicates a problem, such as bad seal maybe. If anyone has the same or same type, would be great to share. Shame I only ordered one, so no base to compare.

Oh, and I think it's safe to say it's not fake, it comes from DigiKey. Also the date code is 2051 which if I'm not wrong would make it just under an year old, so not a problem there either.
« Last Edit: September 17, 2021, 04:10:33 pm by ColdPower »
 

Online Gyro

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Re: Big caps Rattle - Advice needed
« Reply #4 on: September 17, 2021, 06:02:41 pm »
I think I'd probably open one up. Even if they aren't fake, rattling innards can't be good for reliability, particularly in an environment that would involve any degree of vibration.

I'm sure it wasn't the manufacturer's intention that they would rattle.
Best Regards, Chris
 

Offline ColdPowerTopic starter

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Re: Big caps Rattle - Advice needed
« Reply #5 on: September 17, 2021, 06:15:19 pm »
I'm sure it wasn't the manufacturer's intention that they would rattle.

Yup, I'm afraid you're probably right here. I'd just email Nichicon and see if they'd reply. DK wasn't very helpful in this case, but they're probably not the right ones to ask anyway. I'd refrain from opening one up for now, as apart from seeing a loose roll inside, I wouldn't know what to look for and if there would be anything to tell me if it shouldn't be.

Thank you.
 


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