<[email protected]>, Ray Levasseur <[email protected]> inimitably wrote: >I have a number of products that must meet the requirements of EN 61000-3-3 >for voltage fluctuation but I am having problems complying. The failure >happens when a vacuum pump is switched on during a cycle of the machine and >then it is switched off. The inrush that occurs is about 35 amps with a >running current of 5 amps.
Well, first of all, which requirement of the standard are you violating? Have you just assumed that 35 A violates the dmax requirement? It might not, because of phase effects. Then again, is that 35 A a true r.m.s. value over half a cycle? Are you using a test instrument that just returns 'FAIL'? Or does the pump start often enough to run into the actual Pst or Plt limits? I don't suppose you have the big 'Millennium' amendment to the standard, which STILL isn't published yet? Even though (actually, 'because') it's not published yet, enforcement authorities have been 'advised' that it would not be in the public interest to take action against products that satisfy the amended standard but not the original. It would be helpful to know exactly what the product is. -- Regards, John Woodgate, OOO - Own Opinions Only. Phone +44 (0)1268 747839 Fax +44 (0)1268 777124. http://www.jmwa.demon.co.uk Foxhunters suffer from tallyhosis. PLEASE do not mail copies of newsgroup posts to me. ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall,"
