EMI filter for 240v single phase?

[good-ham]

I have a potential noob question about EMI filters. I'm about to add a spindle to my CNC Router (currently using an actual 120v router), which will require installation of a VFD. Because of all the EMI issues I've read about in other threads, I'm trying to make sure I ground properly, etc, but I'm running into issues on an EMI filter for the incoming 240v mains. I've looked at most of the EMI filters I see commonly discussed in the threads (e.g. Schaffner FN2060-20-06), as well as those I find when I search for 240v single phase EMI filter, and their wiring diagrams have lugs for L and N on the line side. That would seem suitable for countries where mains are 240v line with a separate neutral, but in the US, 240v circuits are split phase, with L1 and L2 - each with 120v, 180 degrees out of phase between them - and without a neutral line, so I'm not sure if those would work. What EMI filters are others using for 240v setups in North America? FWIW, I'm hooking up a HY04D023B VFD driving a 3.2kw water cooled Chinese spindle.

Thanks,
Greg

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[john-100]

You can use the EMI filter in the US by connecting L1 to the terminal live terminal L and L2 to the neutral terminal N



in the UK the neutral supply terminal is connected to the protective earth PE

depending on when the supply cable was installed the earth & neutral is joined together
either at the 3 phase transformer star point or the utility company supply terminals

that's why its call neutral instead of line 2

one problem with EMI filters is the eath leakage currents due to the capacitors marked Cy on the filter circuit

some VFD's have a jumper to enable the user disconnect the Cy capacitors from the PE
to avoid the EMI filter tripping the RCCB / GFI

John

[good-ham]

Thanks for the quick reply, John. Much appreciated!

I know Schaffner makes a "B" variant of that filter that omits the Y capacitors; I'll have to see if I can easily get one. Although, the circuit this is going to be on isn't GFI protected, so I don't guess it would matter in my case.

Thanks again!
Greg

[mactec54]

Thanks for the quick reply, John. Much appreciated!

I know Schaffner makes a "B" variant of that filter that omits the Y capacitors; I'll have to see if I can easily get one. Although, the circuit this is going to be on isn't GFI protected, so I don't guess it would matter in my case.

Thanks again!
Greg

Here is a Power Filter which is a better product and price is good also TDK Lambda RSEN-2030L the L is for low Earth leakage so may not have any affect on your GFI

Mouser has a good price on these $22 to $25


967-RSEN-2030L

[good-ham]

That looks great. Just ordered. Thanks!

[Azalin]

In my lathe I added something (people recommend it) that always output live and neutral on the same terminals, even if I plug the power plug to the wall inverse or reverse. I'll open the cabinet and see what it was (I'm a noob too).

By the way, I also use an emi filter for the spindle servo drive on my mill. That particular filters input pins are L1 and L2. If you're interested I can give you the brand and part info.

Sent from my MI 5s Plus using Tapatalk

[Iron-Man]

I have a potential noob question about EMI filters. I'm about to add a spindle to my CNC Router (currently using an actual 120v router), which will require installation of a VFD. Because of all the EMI issues I've read about in other threads, I'm trying to make sure I ground properly, etc, but I'm running into issues on an EMI filter for the incoming 240v mains. I've looked at most of the EMI filters I see commonly discussed in the threads (e.g. Schaffner FN2060-20-06), as well as those I find when I search for 240v single phase EMI filter, and their wiring diagrams have lugs for L and N on the line side. That would seem suitable for countries where mains are 240v line with a separate neutral, but in the US, 240v circuits are split phase, with L1 and L2 - each with 120v, 180 degrees out of phase between them - and without a neutral line, so I'm not sure if those would work. What EMI filters are others using for 240v setups in North America? FWIW, I'm hooking up a HY04D023B VFD driving a 3.2kw water cooled Chinese spindle.

Thanks,
Greg

Good-Ham,

I have used these with no problems;
https://www.ebay.com/itm/ALLEN-BRADLEY-2090-UXLF-110-AC-LINE-FILTER-250VAC-10AMP/273072275669?_trkparms=aid%3D555018%26algo%3DPL.SI M%26ao%3D1%26asc%3D57476%26meid%3Dcbd782088709442d af4432b48cbfa961%26pid%3D100005%26rk%3D1%26rkt%3D1 2%26sd%3D182050275393%26itm%3D273072275669%26pg%3D 2047675&_trksid=p2047675.c100005.m1851


If you search on Ebay sometimes you can get them brand new for around $ 25.00.

Hope this helps,

Iron-Man