> -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of > Gordon,Ian > Sent: Monday, September 21, 2009 12:32 AM > To: White, Ian > Cc: IEEE EMC & SAFETY PSTC > Subject: RE: EMC Directive and solenoid valves > > Ian et al > We manufacture solenoid operated vacuum valves (amongst other things) > and obtained a statement from ERA to the effect that they were benign > as > far as the EMC directive is concerned. > > > Ian Gordon
When the solenoid is de-energized, isn't there a large and fast voltage generated? When a solenoid manufacturer puts a diode across the coil to limit the voltage, doesn't the large current flowing through the diode and coil create a spectral distribution of energy? Perhaps the Directive ignores the short duration burst, but I don't think you can call a solenoid coil completely benign. Ed Price [email protected] WB6WSN NARTE Certified EMC Engineer Electromagnetic Compatibility Lab Cubic Defense Applications San Diego, CA USA 858-505-2780 Military & Avionics EMC Is Our Specialty - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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]>
