Hi all, Thanks for the help Two other issues related to fan life and maintenance:
1. How do you test fan units (often containing several fans) which return >from customers, to assess the state of the fans (in my opinion, in many cases we do not detect marginal fans, and return marginal fan units to the field). Should we measure current, speed, noise....? 2. If a fan fails, what would be the criterion to replace other fans in the fan unit before returning it to the field? regards, Moshe ----- Original Message ----- From: "Moshe Valdman" <[email protected]> To: "'EMC PSTC'" <[email protected]> Sent: Wednesday, March 26, 2008 7:42 PM Subject: Life expectancy of fans > Hi all, > > I'm having problems getting weibull parameters from DC fan manufacturers > They give L10 (useful life - time when 10% of fans have died) but not the > beta (shape factor) > I.e. I can't know how quickly the rest of the 90% will fail > > Can anyone help on this? > > thanks in advance, > Moshe Valdman - reliability engineer > - > ---------------------------------------------------------------- > 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. 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
