It was the symmetrical control for the powering of heating elements part that was the previous condition that was fulfilled.
Hope this helps James ---- John Woodgate wrote ---- >OK, I've sent a digest to the committee chair. Meanwhile, I noticed >something that I don't quite understand: > >You say that "Clause 6.1 also says that symmetrical control for >professional equipment is OK provided one of the “above conditions” is >fulfilled (which it is, see previous bullet)" > >Which is the 'above condition' that the welder meets? > >John Woodgate OOO-Own Opinions Only >J M Woodgate and Associates www.woodjohn.uk >Rayleigh, Essex UK > >On 2017-10-11 17:08, James Pawson (U3C) wrote: >> >> Hello John, >> >> It uses phase angle control hence the concern about the harmonics >> generated. >> >> Manufacturer specs are single phase, 230V nominal, 3kW. >> >> Typically used at less than a 15% duty cycle, often less, in an >> industrial environment or powered from a generator. >> >> My *feeling* is that should be classified as professional equipment >> and exempted under Clause 7 but the IEV has 0 search for feelings. >> >> Thanks for your help >> >> James >> >> *From:*John Woodgate [mailto:j...@woodjohn.uk] >> *Sent:* 11 October 2017 16:49 >> *To:* EMC-PSTC@LISTSERV.IEEE.ORG >> *Subject:* Re: [PSES] IEC 61000-3-2 Confusion >> >> I agree that there appears to be a need for clarification, and I will >> take that up with the committee responsible. But for your particular >> case, what is critical is the nature of the 'triac control'. Is it >> phase-angle control, or 'burst firing' or something else? >> >> John Woodgate OOO-Own Opinions Only >> J M Woodgate and Associateswww.woodjohn.uk <http://www.woodjohn.uk> >> Rayleigh, Essex UK >> >> On 2017-10-11 15:01, James Pawson (U3C) wrote: >> >> Hi folks, >> >> I apologise as I seem to be all take and not much give on this >> forum at the moment; I’m trying to do a lot of learning very >> quickly. Someone ask a question about HDMI so that I can feel useful! >> >> Today’s question is what appears to be a contradiction in IEC >> 61000-3-2:2014. >> >> * The customers equipment is a triac controlled high-power PSU >> for welding plastic parts together using resistance heater coils >> * Power is over 1kW and the customer is suggesting that it is >> “professional equipment” which, according to Clause 7, means >> that harmonic “limits are not specified in this standard” >> * Flowchart in Clause 7 says that Clause 6.1 for allowed control >> methods still applies even to equipment with no limits >> * Clause 6.1 says symmetrical control methods which produce >> large low order harmonics (arguably this applies to triac >> control) that are used to power heating elements (applicable) >> provided that either input power is less than 200W (it isn’t) >> or the harmonic limits of Table 3 apply >> * Clause 6.1 also says that symmetrical control for professional >> equipment is OK provided one of the “above conditions” is >> fulfilled (which it is, see previous bullet) >> >> So we’ve gone from Clause 7 saying no limits apply to Clause 6 >> saying that Class D equipment limits apply. >> >> However the flowchart in Clause 7 suggests that just by being >> exempt from Clause 7 limits means it automatically conforms to >> 61000-3-2 >> >> I feel like I’m going in circles. Does anyone have any insight >> that might help? >> >> Much appreciated, >> >> James >> >> - >> ---------------------------------------------------------------- >> >> This message is from the IEEE Product Safety Engineering Society >> emc-pstc discussion list. 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To post a message to the list, send your >> e-mail to <emc-p...@ieee.org <mailto:emc-p...@ieee.org>> >> >> All emc-pstc postings are archived and searchable on the web at: >> http://www.ieee-pses.org/emc-pstc.html >> >> Attachments are not permitted but the IEEE PSES Online Communities >> site at http://product-compliance.oc.ieee.org/ can be used for >> graphics (in well-used formats), large files, etc. >> >> Website: http://www.ieee-pses.org/ >> Instructions: http://www.ieee-pses.org/list.html (including how to >> unsubscribe) >> List rules: http://www.ieee-pses.org/listrules.html >> >> For help, send mail to the list administrators: >> Scott Douglas <sdoug...@ieee.org <mailto:sdoug...@ieee.org>> >> Mike Cantwell <mcantw...@ieee.org <mailto:mcantw...@ieee.org>> >> >> For policy questions, send mail to: >> Jim Bacher <j.bac...@ieee.org <mailto:j.bac...@ieee.org>> >> David Heald <dhe...@gmail.com <mailto:dhe...@gmail.com>> >> > > >- >---------------------------------------------------------------- >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 ><emc-p...@ieee.org> > >All emc-pstc postings are archived and searchable on the web at: >http://www.ieee-pses.org/emc-pstc.html > >Attachments are not permitted but the IEEE PSES Online Communities site at >http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used >formats), large files, etc. > >Website: http://www.ieee-pses.org/ >Instructions: http://www.ieee-pses.org/list.html (including how to >unsubscribe) >List rules: http://www.ieee-pses.org/listrules.html > >For help, send mail to the list administrators: >Scott Douglas <sdoug...@ieee.org> >Mike Cantwell <mcantw...@ieee.org> > >For policy questions, send mail to: >Jim Bacher: <j.bac...@ieee.org> >David Heald: <dhe...@gmail.com> - ---------------------------------------------------------------- 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 <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
