Pat, I'm looking at edition 2, dated 2004-03, and it appears the wording has not changed.
You are correct about the inrush requirement. It does not have to be more than 500A for the voltages mentioned, but it also does not have to be more than the margin required above the actual EUT inrush current. We don't, at the present time, have the required fixture (rectifier and capacitor)necessary to measure the output of the power supply. I'm sure we can build it, but does anyone know of a source? Thanks, Bob Richards, NCT --- On Tue, 5/20/08, [email protected] <[email protected]> wrote: > From: [email protected] <[email protected]> > Subject: Re: 61000-4-11 Inrush current > To: [email protected], [email protected] > Date: Tuesday, May 20, 2008, 3:00 PM > Hi Bob: > > I have a copy of IEC61000-4-11:1994. Take another look at > clause 6.1.1. > It says the peak inrush current drive capability '... > need not exceed 500A > for 220V-240V mains, or 250A for 100V-120V mains.' > > For a minimum capability, look at clause 6.2.2. It says > that 'the > measured EUT peak inrush current shall be less than 70% of > the peak > current drive capability of the generator, ...' > Ipk.EUT < 70% * Ipk.generator > Solving for Ipk.generator gives: > Ipk.EUT * 143% < Ipk.generator > Note the special test conditions for measuring the EUT peak > inrush current > in Annex A. > > So your generator needs to be capable of a peak current > between Ipk.EUT * > 143% and 500A. > > As far as your 'AC fault' information is concerned, > ask your associate > where it is documented. > > Pat Lawler > EMC Engineer > SL Power Electronics Corp. > > [email protected] wrote on 05/20/2008 05:11:26 AM: > > A question came up recently where I work about the > current > > requirements of the AC source used for testing voltage > dips and > > interrupts. I was told the scope of the standard is > for products up > > to 16A and that *includes* inrush current during > turn-on. > > > I referenced table 6.1.1 where the peak inrush current > capability > > must be 500A for 200 - 240v mains voltage, but was > told this table > > only covers AC fault conditions, not normal operations > (including > turn-on). > > > Since one of the tests is a >95% interruption for 5 > seconds, would > > this be considered an AC fault, or a normal turn-on > for the EUT? > > Appendix A sure makes it sound like the inrush > requirement is for > > the power-up of the EUT. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
