forwarding for [email protected] ____________________Reply Separator____________________ Subject: RE: EN 61000-3-3 Author: "Wagner; John P (John)" <[email protected]> List-Post: [email protected] Date: 9/12/00 2:59 PM
A recent CDV (which I believed passed) defines what is meant by"significant." The wording is: - 2 - 77A/303A/CDV Page 5 5. Limits Replace the whole of the existing clause by the following text: The limits shall be applicable to voltage fluctuations and flicker at the supply terminals of the equipment under test, measured or calculated according to clause 4 under test conditions described in clause 6 and annex A. Tests made to prove the compliance with the limits are considered to be type tests. The following limits apply: - the value of P st shall not be greater than 1.0; - the value of P lt shall not be greater than 0.65; - the value of d(t) during a voltage change shall not exceed 3,3% for more than 500 ms; - the relative steady-state voltage change, d c , shall not exceed 3,3%; - the maximum relative voltage change d max , shall not exceed: a) 4% without additional conditions. b) 6% for equipment with : - manual switching or - automatic switching more frequently than twice per day and has a delayed restart (the delay being not less than a few tens of seconds) or manual restart after a power supply interruption. NOTE The cycling frequency will be further limited by the Pst and Plt limit. For example: a dmax of 6% producing a rectangular voltage change characteristic twice per hour will give a Plt of about 0,65. c) 7% for equipment which - is attended whilst in use (For example: hair dryers, vacuum cleaners, kitchen equipment such as mixers, garden equipment such as lawn mowers, portable tools such as electric drills.) or - is switched on automatically or is intended to be switched on manually no more than twice per day and has a delayed restart (the delay being not less than a few tens of seconds) or manual restart after a power supply interruption. In the case of equipment incorporating multiple loads, limits b) and c) shall only apply if there is delayed or manual restart after a power supply interruption; for all equipment with automatic switching which is energised immediately on restoration of supply after a power supply interruption, limits a) shall apply ; for all equipment with manual switching, limits b) or c) shall apply, depending on the rate of switching. P st and P lt requirements shall not be applicable to voltage changes caused by manual switching. The limits shall not be applicable to emergency switching or emergency interruptions. John P. Wagner Lucent Technologies, Bell Labs 11900 N. Pecos St, Room 2F58 Denver CO 80234 email: [email protected] phone: 303 538-4241 fax: 303 538-5211 > ---------- > From: Gary McInturff[SMTP:[email protected]] > Reply To: Gary McInturff > Sent: Tuesday, September 12, 2000 10:05 AM > To: 'Brooks, Barbara'; EMC Post > Cc: [email protected] > Subject: RE: EN 61000-3-3 > > > Barbara, > While not definitive I believe the scope section of the standard describes > a > few likely devices. I don't have the standard in front of me, but seems I > remember seeing it that section. > Gary > > -----Original Message----- > From: Brooks, Barbara [mailto:[email protected]] > Sent: Tuesday, September 12, 2000 7:10 AM > To: EMC Post > Cc: [email protected] > Subject: EN 61000-3-3 > > > > > Does any one have any information regarding how you determine if equipment > will not product significant voltage fluctuations or flicker with out > performing the tests of EN 61000-3-3 per Paragraph 6.1? > > EN 61000-3-3 Paragraph 6.1 states "Test shall not be made on equipment > which > is unlikely to product significant voltage fluctuations or flicker." > > > Barbara Brooks > Wyle Laboratories > 7800 Highway 20 West > Huntsville, AL 35807-7777 > (256) 837-4411 ext 595 > (253) 721-0144 Fax > [email protected] > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
