1 The medical grade RFI filters have a much smaller capacitance between line and ground, and usually have more series inductance. It can be tough to find medical style line filters with high current ratings. Plus, they're expensive...
2. I recently spoke with an engineer from North Shore Safety (a maker of GFCIs). We got on this very subject and he told me that their devices have a low pass (about 1kHz) filter that somehow decreases sensitivity noise current returned through ground. I didn't fully understand what he was saying at the time, but it impressed upon me that this was a real world problem. Since we can't really monkey around with the innards of either of these components, it may come down to a choice between one or the other. You might want to try some large ferrite beads on the AC power input wires that go to the VFD. Something like Steward LFB259128-000. See this: http://www.steward.com/pdfs/brochures/Broch046.pdf Thanks, Matt On Sat, 2009-10-03 at 19:44 -0500, Jon Elson wrote: > Andy Pugh wrote: > > Are RFI filters for inverters generally incompatible with RCDs? > Yes, they can be. Boxed RFI filters have capacitors to ground, so > necessarily they divert some mains current to safety ground. > If that current is above the threshold of the RDC, it has to trip. > You might be able to find a medical-grade filter or some other > with extra-low ground current. ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
