Ted, Thank you for your reply.
We sell products worldwide to operate in the 200-260 (230V Norm) voltage range. The information I seek includes help in determining where to draw the line between real world power line conditions that a product should work properly in and the conditions in which a product is not expected to work properly in. Your statement in your second paragraph about manufacturers performing a cost-benefit analysis describes what it is we are trying to determine. Keeping in mind the cost of having personnel at a customer site for days or longer to try and determine a problem. Power line conditioners, which are very expensive for systems that can draw up to 40 amps, are often used to troubleshoot problems. In those cases where the conditioner seems to fix the problem we are trying to determine if the problem is our hardware not being designed immune enough or the power line conditions at some customer sites are beyond what is reasonable to expect a piece of high end analytical equipment to work properly in. Thanks again, The Other Brian From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Wednesday, November 08, 2006 9:39 AM To: [email protected] Subject: Re: Worst Case AC Power Conditions Hello Brian, Can you provide a little more information for your first question? Into what regions will you sell your product? Worst-case conditions will vary significantly from one part of the world to another. Frequency is very stable in Western Europe and North America, but it can vary significantly in Africa, India and Southeast Asia. You can expect extended brown-out conditions in some areas and this can be more wide spread. Products sold in California will need to withstand significant voltage drops for extended periods. Many regions have either poor enforcement or lacking regulations for harmonic control, particularly in industrial applications. A product located near large industrial VFDs will be subject to significant interference. Most manufacturers can do no better than performing a cost-benefit analysis for their design. Make the product as robust as possible without incurring a significant cost increase. Then, provide clear documentation on the operating limits. Customers in areas with poor power control may accept the necessity of using power conditioning equipment with certain products. In regards to item 3, there are numerous options. I have worked with Dranetz equipment in the past, but there are plenty of options. http://www.dranetz-bmi.com/ http://www.aemc.com/ http://dentinstruments.com/ http://us.fluke.com/usen/products/category.htm?category=PQTTOP(FlukeProd ucts)&trck=rpm Best regards, Ted Eckert American Power Conversion Corporation The items contained in this e-mail reflect the personal opinions of the writer and are only provided for the assistance of the reader. The writer is not speaking in an official capacity for APC nor representing APC's official position on any matter. "Kunde, Brian" <brian_kunde@leco tc.com> To Sent by: <[email protected]> [email protected] cc Subject 11/08/2006 08:14 Worst Case AC Power Conditions AM Greetings, 1. Can anyone provide specifications for a "worst case" real world AC power line condition in which an apparatus is expected to operate properly in (pass/criteria A)? This would encompass a combination of harmonics, voltage variations, frequency variations, etc.. 2. Also, if anyone has a program for a California Instrument CTS system with a 5000ix power supply that could test for a "worst case" AC line condition, that would be helpful. I have heard that some companies have developed such a custom program to simulate poor power conditions >from different parts of the world. Such a program would operate with the the provided CIgui32 program. 3. Can anyone recommend an AC Power Line analyzer that we can just plug-in and it will analyze the AC power conditions at different customer locations? Then we could take the results and program our 5000ix power supply to simulate those conditions in our lab. The reason I'm asking is that from time to time we have experienced problems in the field due to with poor AC power line conditions at some customer locations even though we test and comply with the standard tests that are required for CE (surge, burst, dips, etc). We want to develop an internal test standard that will minimize problems in the field. Thank for any help or advice you can offer. The Other Brian. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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