Author Topic: wiring filter Caps to Power Entry Modules??  (Read 1345 times)

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Offline jauntyTopic starter

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wiring filter Caps to Power Entry Modules??
« on: September 12, 2017, 07:18:52 am »
hi guys - i'm just finishing a kit project and really UNCLEAR as to whether and/or HOW I need to add filter caps to a power entry module.

The module is this one

https://www.schaffner.com/fileadmin/media/products/pim/FN%20380.pdf

there's a schematic - there are two pairs of caps indicated and (on my specific module) they are labelled 0.02 nF and 0.047 µF. what is unclear is how necessary these are (just for spike mitigation?) and/or if they aren't in fact already built INTO the module - and it's just such a standard thing they don't bother mentioning it ... (?)

any help here????

incidentally ... this is being hooked up to a linear power supply
« Last Edit: September 12, 2017, 07:21:16 am by jaunty »
 

Offline danadak

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Re: wiring filter Caps to Power Entry Modules??
« Reply #1 on: September 12, 2017, 10:28:34 am »
Caps/filter built into the connector, see opening description paragraph in datasheet.


Regards, Dana.
Love Cypress PSOC, ATTiny, Bit Slice, OpAmps, Oscilloscopes, and Analog Gurus like Pease, Miller, Widlar, Dobkin, obsessed with being an engineer
 

Offline T3sl4co1l

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Re: wiring filter Caps to Power Entry Modules??
« Reply #2 on: September 12, 2017, 12:15:25 pm »
How do you know you need one at all (versus a plain, dumb receptacle)?

Tim
Seven Transistor Labs, LLC
Electronic design, from concept to prototype.
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Offline TimNJ

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Re: wiring filter Caps to Power Entry Modules??
« Reply #3 on: September 13, 2017, 09:31:22 pm »
Yes, as stated above, the filter circuit is built into the power entry module. The purpose of these line filters is two fold: It filters interference from the outside from entering your product, and prevents your product from conducting interference onto the line.

In my experience, they are mostly used to address the latter. That's because there are regulations on conducted emissions that products must meet. If you are just doing a personal DIY project, then you don't really have to worry about that (too much). However, it's still generally good practice to use one, and I usually do.
 

Offline jauntyTopic starter

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Re: wiring filter Caps to Power Entry Modules??
« Reply #4 on: September 14, 2017, 04:23:16 am »
Thanks for the help! Though (to Dana) the first paragraph didnt' make it at all obvious to me that it was built in- since it didnt' explicitly say this).



 

Offline jauntyTopic starter

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Re: wiring filter Caps to Power Entry Modules??
« Reply #5 on: September 14, 2017, 04:27:16 am »
Yes thanks guys ... I just bought the modules because they looked pretty slick as a power termination (meaning connection) product for my IEC cable - without ever having given it a single thought - then after installing them I started noticing the diagram on the module and scratching my head over it ... thinking it was somehow required either by something innate to the product or else electrical code.

Turns out though that it's mostly about flitering outgoing junk - but I guess it's not such an issue for me since it's connected to a linear supply ... ah well - live and learn ...! thanks again
 


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