In IEC 61000-4-11:2004 above Table 1, is the vague phrase: "Shorter durations in the table, in particular the half-cycle, should be tested to be sure that the equipment under test operates . . . "
Testing may have shown that some mains transformers have problems with successive half-sines of the same polarity. For example, ' + - + _ + - +' (the underscore is a half-cycle dropout at 180 degrees.) Pat Lawler EMC Engineer SL Power Electronics Corp. [email protected] wrote on 09/17/2009 01:36:42 PM: > I believe the change is to reflect alignment with the base > dips/interruptions spec EN/IEC 61000-4-11:2004 Table 1 . "Preferred > test level and durations for voltage dips", Class 2, which has both > 1/2 and 1 cycle 0% dips. > > See EN 300 386 v1.4.1 Section 2.1 Normative References [14]. The > previous EN 300386 v1.3.2 cited an undated reference for > 61000-4-11, but the new one is a dated reference (2004). > > William T. Sykes > Compliance Engineer > Motorola Home & Networks Mobility > 101 Tournament Drive > Horsham, PA 19044 > 215-323-2619 > [email protected] > > From: [email protected] [mailto:[email protected]] On Behalf Of Monrad Monsen > Sent: Thursday, September 17, 2009 3:08 PM > To: [email protected] > Subject: Clarification on ETSI EN 300 386 v1.4.1 > > I need help in understanding ETSI EN 300 386 v1.4.1 (2008-04). In > section 7.2.2.4 (page 26) for "Other than telecommunication centres, > AC power ports", the standard gives the requirement for a "voltage > dips and short interruptions immunity test" (7.2.2.4.4) stating thefollowing: > Residual voltage % > 0 Criteria B > Cycle 0.5 > Residual voltage % > 0 Criteria B > Cycle 1 > > Both have the same performance criteria requirement (Criteria B) > and both are full voltage interruptions (0%), so the two entries are > redundant. Obviously, this is a typographical error. We just need > to know which is the actual requirement of the standard. Either > the standard wants us to test for a half cycle (10 ms) or for a > full cycle (20 ms). > > In the earlier revision (ETSI EN 300 386 v1.1.3), section 7.2.2.4 > required the following voltage interruption test: > Voltage reduction % > >95 Criteria B > Duration ms 10 > > Did ETSI EN 300 386 v1.4.1 intend to keep the same duration using > 0.5 cycle (same as 10ms from the past) so the other entry is the > actual error, or did the committee really want to increase the > required voltage interruption immunity by testing a full 1.0 cycle > (doubles the requirement to 20ms) so the first entry is really the error? > > Note: ETSI EN 300 386 v1.4.1 is titled "Electromagnetic > compatibility and Radio Spectrum Matters (ERM); Telecommunication > network equipment; ElectroMagnetic Compatibility (EMC) > requirements." The date of withdrawal (dow) or date when this > standard revision becomes mandatory in Europe is 31 July 2011. > > Thank you. > -- > > Monrad L. Monsen > Worldwide Compliance Officer > Sun Microsystems > [email protected] > 303.272.9612 Office > > > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society > emc-pstc discussion list. To post a message to the list, send your > e-mail to <[email protected]> > > All emc-pstc postings are archived and searchable on the web at > http://www.ieeecommunities.org/emc-pstc > Graphics (in well-used formats), large files, etc. can be posted to > that URL. > > Website: http://www.ieee-pses.org/ > 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]> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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]>
