I seek your advice on how to ‘best’ properly protect a 24 volt dc Output port on a piece of Laboratory Equipment (UL/IEC/EN 61010-1).
Here is the situation: AC to DC power supply that can output 24Vdc at 50 amps which goes to a DC Distribution PC Card. This card has several IC chips known as either a Smart Switch or High Side Driver which we use to turn on and off the 24Vdc output which exits our enclosure on an Output Port. The High Side Driver (HSD) ICs provides a nominal output current of 4.2 amps and over current protection shutting down the output at 8 amps (also has over temperature protection at 150ºC). Our output connector and wiring can handle 8 amps. Since the HSD is not a certified over current protection device I assume I must consider a fault in this part providing 50 amps to the Output Port. Is this correct? If so, I would need to add an overcurrent protection device. In this case, what would you recommend? Can Polyfuses (resettable PTCs) be used in this application? We prefer a self resettable device over a one-shot device but we are considering a fuse, picofuse, or circuit breaker. What if we used two HSD circuits in series where both would have to fault? Would this be acceptable? Thank you in advance for any suggestions. The Other Brian _________________________ LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - ---------------------------------------------------------------- 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://product-compliance.oc.ieee.org/ 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]> - ---------------------------------------------------------------- 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://product-compliance.oc.ieee.org/ 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]>
