Doug and group, Sorry to have replied so late,
No, the current version standard will become mandatory during the transition period of the new one. For details, please wait until the new version is out for voting (few weeks). Probably the new standard will only use a 50 Watts limit but for all equipment now. I do not agree with Rich about the rectifiers with special wave shape excluded for meeting limits. This only happens when a certain amount of power is exceeded approximately 250 VA, and simple measures (at the cost of dissipation: I admit) like a series resistor can bring larger power supplies into compliance. At approx. 400 Watt this will be impractical, and one will need to use a pre switcher. (Read EDN Jan 2000). A story I was testing a call completion center of a big bank in the Netherlands. They had about 40 PCs per mains supply group. The harmonics of these 50 Class D special Wave shape equipment summed up in the Neutral connector creating a 150 Hz current of over 20 Amps ! The groups were fused at 3 x 16 amps each ! The power dissipation in the building mains transformer increased due to 6 of these groups substantially. This could mean larger feed transformers, and increased wire thickness. As the office automation equipment will be used in increasing numbers, the harmonic current will possibly mean that the national energy infra structure will have to be over dimensioned with 10-15 %. This means that several new power plants has to be build just because of harmonics. But no-one will pay for it. Imagine your energy bill to rise with 10-15% without increased power consumption ?? Regards, Gert Gremmen ce-test, qualified testing >-----Original Message----- >From: dfra...@yurie.com [mailto:dfra...@yurie.com] >Sent: Wednesday, January 19, 2000 4:53 PM >To: cet...@cetest.nl >Cc: emc-p...@majordomo.ieee.org >Subject: RE: Harmonics Testing > > >Gert, > >Does this imply that the current revision will be withdrawn before it >becomes mandatory for CE-marking? If so, how does this affect CE-Marking >requirements in the 1-1-2001 to 1-1-2003 timeframe? Can you elaborate on >what the requirements will be on 1-1-2001 for the following: > >PS < 50w >50W < PS <75w >PS > 75w > >Is the intent t withdraw the current -2 standard and delay mandatory >testing until 1-1-2003, or will there be mandatory requirements one year >from now? > >Doug Frazee >Regulatory Compliance Manager >Lucent Technologies, Broadband Carrier Networks >dfra...@lucent.com > > > > > >"cetest" <cet...@cetest.nl> on 01/19/2000 08:15:27 AM > >Please respond to "cetest" <cet...@cetest.nl> > >To: "Bruce Touzel" <btou...@acc.com> >cc: "'emc-pstc'" <emc-p...@majordomo.ieee.org> (bcc: Doug > Frazee/HQ/Yurie) >Subject: RE: Harmonics Testing > > > > > >Bruce ., > >It will be applicable to virtually all equipment exceeding 50 Watt. >The new 3-2 will have of course it's transaction period to 1-1-2003 >(or even longer as some suggest) > > >Gert Gremmen > >cetest, qualified testing > >>-----Original Message----- >>From: Bruce Touzel [mailto:btou...@acc.com] >>Sent: Tuesday, January 18, 2000 11:14 PM >>To: cetest >>Cc: Flinders, Randall; 'emc-pstc' >>Subject: Re: Harmonics Testing >> >> >>Gert, >>Is 3-2 applicable to power supplies of 50W in Jan 1, 2001 ? >>Or is it still 75W in Jan 1, 2001, then 4 years later changed to 50W ? >> >>thanks >>Bruce >> >>cetest wrote: >> >>> I suppose Randy you are concerned about the EN-61000-3-2 instead of the >>> EN 61000-3-3 which is concerned with Flicker testing. >>> >>> Please Note that the 3-2 is currently under revision and prone to change >>> very soon ! >>> >>> I would select Scenario #1 >>> >>> The 50 watt limit is meant to be used for all equipment, and the current >>> document TC210-169 (in voting right now) has it's clause modified >>> as such. >>> >>> Strictly read you are right about the application of scenario #2. >>> >>> The current 3-2 is a very bad document, f.a. nothing is said about >>> test times and transitory effects. This will all or partly be covered >>> in the new version. >>> >>> BTW Using scenario #2 it will be hard to exceed any limit at all with >an >>> active input power < 50 watt !!! >>> >>> Gert Gremmen >>> ce-test qualified testing >>> >>> ============================== >>> http://www.cetest.nl >>> Do you know our >>> CE/E mark True type Font ? >>> http://www.cetest.nl/cettf.htm >>> ============================== >>> >>> >-----Original Message----- >>> >From: owner-emc-p...@ieee.org [mailto:owner-emc-p...@ieee.org] >>> >Sent: Tuesday, January 18, 2000 7:12 PM >>> >To: 'emc-pstc' >>> >Subject: Harmonics Testing >>> > >>> > >>> >Greetings EMC Professionals! >>> > >>> >I have a quick question regarding Harmonics testing to >>> >EN61000-3-3. We have an ITE product with a switching power >>> >supply. The product uses about 38 watts input power. According >>> >to the standard, which scenario applies? >>> > >>> >Scenario #1 >>> > >>> >The unit does not need to be tested, because it falls below the >>> >Class D Input power range of 75(50)W to 600W. Section 7.4 of the >>> >standard states that "...No limits apply for equipment with an >>> >active input power up to and including 75W...." >>> > >>> >Scenario #2 >>> > >>> >Since the unit does not use more than 75W (or more than 50W for >>> >that matter), the unit then defaults to the Class A requirements >>> >and therefor must meet the less stringent Class A limits. Section >>> >5 of EN61000-3-3 states: " Class A: Balanced 3-phase equipment >>> >AND ALL OTHER EQUIPMENT, except that stated [in Classes B-D]..." >>> > >>> >So I guess my question is this: when an ITE product with a >>> >switching power supply uses less than 50W (75w), does it become an >>> >exempt Class D Device, or doe sit become a Class A device? >>> > >>> >Your insights would be appreciated..... >>> > >>> > >>> >Regards, >>> > >>> > >>> >Randy Flinders >>> >Chairman >>> >Orange County Chapter >>> >IEEE EMC Society >>> >r.flind...@ieee.org >>> >(714) 513-8012 >>> >(714) 513-8265 Fax >>> > >>> >Note: The opinions expressed herein are personal and in no way >>> >represent the position of the IEEE, The EMC Society, or my employer. >>> > >>> >>> >>------------------------------------------------------------------------ >>> Name: winmail.dat >>> winmail.dat Type: DAT File >>(application/x-unknown-content-type-dat_auto_file) >>> Encoding: base64 >> > > > >--------- >This message is coming from the emc-pstc discussion list. >To cancel your subscription, send mail to majord...@ieee.org >with the single line: "unsubscribe emc-pstc" (without the >quotes). For help, send mail to ed.pr...@cubic.com, >jim_bac...@monarch.com, ri...@sdd.hp.com, or >roger.volgst...@compaq.com (the list administrators). > > > > > > > > --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
