True, but did KT have this equipment 4yrs ago? Does anyone you know of rent this equipment? We also have a Schaffner tap switcher, but it eats itself under heavy loads. Is the KT stuff more robust under heavy startup loads? The Pacific Power equipment I use has never broke down. Worth the weight just for that... kyle
-----Original Message----- From: Mike Hopkins [mailto:[email protected]] Sent: Tuesday, November 20, 2001 2:47 PM To: 'Ehler, Kyle'; '[email protected]'; [email protected] Subject: RE: Methods & Equipment; Surge & Dips Seems to me this is the hard way to do it..... KeyTek has a product that is a tap switcher for the required levels and will pass the in-rush currents required. It's a much smaller package..... Also, other manufacturers have systems that are basically software controlled switches -- bring in the AC levels you require via a variac or some other transformer and simply switch between them.... Mike Hopkins -----Original Message----- From: Ehler, Kyle [mailto:[email protected]] Sent: Tuesday, November 20, 2001 1:19 PM To: '[email protected]'; [email protected] Subject: RE: Methods & Equipment; Surge & Dips Hi William, I dont know about renting equipment for the tests. You can probably find it. For the -4-11 (dip/dropout) test; Depending on your load, your site wiring has to be up to snuff. The power sources for doing the dip and dropout test are hefty stuff. My lab uses a three-phase powered source to deliver a max of 16A into a single phase capacitive (SMPS) load. I have a Pacific Power 140 TMX and an AMX 390. The 140 does flicker/harmonics and can do dip/dropout within its output limits (about 10A inrush). Any loads beyond a 10A inrush gets dip/dropout tested by the 390. The 140 is totally pc controlled but can be programmed through the front panel. It is a handy doer. The 390 is the heavy (up to 20A inrush) and I program it through the front panel for the desired dips and dropouts. There are some models that are computer attached (RS232 or IEEE488) and you execute software programmed routines for the test. Mitigation? Most EUT's can easily withstand half and single cycle drop, many can take a little more (up to 5 cycles) before going seriously anemic. Same is true for sags if the mains are wide range input. If you fail, you reselect the product's power supply, or beef up the input bulk capacitance (assuming SMPS type) or adjust the monitoring circuitry (i.e. remote sense, power good signal) for slower response and/or higher threshold. For the -4-5 (surge) test; We use a schaffner NSG 650 attached to a pc running the schaffner surge software. The surges are delivered to the EUT through a CDN 110 coupler. The cross coupling changes are manual jumpers. We also have a Haefely Psurge 4010 and 32.1 coupling filter for heavy loads. The cross coupling changes are automatic. The EUT supply cord length has to be no longer than .8M to the surge generator. <make a custom cable> This test series can damage your EUT, so you might want to do this test last. Mitigation of failures takes on a myriad of possibilities. Wiring length, TVSS absorber capacity, etc. It is hard to say without knowing more about your product. Do you also need to do the -4-4 (EFT) test? All this test gear is large and heavy, particularly the power sources and stepping xformers. Perhaps someone else can elucidate on exceptions to Class A rules? I gotta go, Happy Hunting, Kyle Ehler KCØIQE < mailto:[email protected] <mailto:[email protected]> > Assistant Design Engineer LSI Logic Storage Systems Div. 3718 N. Rock Road U.S.A. Wichita, Kansas 67226 Ph. 316 636 8657 Fax 316 636 8321 -----Original Message----- From: [email protected] [ mailto:[email protected] <mailto:[email protected]> ] Sent: Monday, November 19, 2001 10:29 AM To: [email protected] Subject: Methods & Equipment; Surge & Dips Esteemed listmembers, In gearing-up for testing under the auspices of EN61326:97, I'm trying to understand two immunity tests: EN61000-4-5 (surge immy) and -4-11 (dips immy). Is there test equipment one can rent to conduct these tests? What sort of mitigation steps are typical. Is anyone aware of any exceptions for this testing under ClassA rules? Thanks in advance... Wm Flanigan Standards Engineer Ameritherm Inc ------------------------------------------- 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/ <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: No longer online until our new server is brought online and the old messages are imported into the new server.
