Doug, We have a piece of I.T.E. equipment that we designed that has dual power supplies with an EMI filter on the AC input of both supplies. We designed our own filters for this particular unit. They are simply small through-hole PC Boards (about 1" x 4") with the components (inductors and capacitors) mounted on the boards. They have male faston connectors at each end of the board for attaching the wires for the AC in from the IEC connector and AC out to the supplies. These are mounted to standoffs in the unit via screws. There is no cover over or around these filter boards other than the top cover of the equipment. So the only way to access them is to take the cover off of the unit. This unit has undergone safety certification at TÜV Product Service to EN60950. The unit has also passed all of the required EMC tests for CE Marking. The open frame filter boards did not cause any problems at either test lab.
Kurt Andrews Compliance Engineer Tracewell Systems, Inc. 567 Enterprise Dr. Westerville, OH 43081 Ph. 614-846-6175 Fax 614-846-7791 Email: [email protected] -----Original Message----- From: POWELL, DOUG [SMTP:[email protected]] Sent: Wednesday, December 08, 1999 12:16 PM To: EMC-PSTC (E-mail); Treg Listserv (E-mail) Subject: Open Frame EMI Filters Hello group, For years I have used off-the-shelf and custom EMI filters with a fully enclosed metal canister. Why is this enclosure required? Are there specific provisions in the standards? My idea is to build up the filter circuit on a printed circuit board and make it an integral part of the power supply. I am currently looking at EN133200 which has certain seal tests but after reviewing these, they all appear to be related to climatic or environmental conditions. If the product passes these tests without the enclosure it would seem that the product has passed, period. Alternatively I have considered removing the nomenclature "EMI filter" and simply call it an input module, then evaluate it as a part of the overall system. If it passes the EMC and Product Safety requirements, can I call the job complete? Any thoughts? ======================================= Douglas E. Powell Regulatory Compliance Engineer Advanced Energy Industries, Inc. 1625 Sharp Point Dr. Fort Collins, Colorado 80525 USA m/s: 2018 --------------------------------------- 970-407-6410 (phone) 970-407-5410 (e-fax) 800-446-9167 (toll-free) mailto:[email protected] <mailto:[email protected]> http://www.advanced-energy.com <http://www.advanced-energy.com> ======================================= --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
