Are we looking at the same Mean Well datasheet? https://www.meanwell-web.com/content/files/pdfs/productPdfs/MW/DRDN20/DRDN20 -spec.pdf
The - terminals appear to be just 3 screw terminals connected together for your convenience in wiring. And with a capacitor to frame ground. Couldn't you just use the 2 diodes as 2 diodes and wire them as you please? (They appear to actually be MOSFETS acting as diodes but with zero voltage drop.) But maybe I shouldn't take the schematic so literally. -----Original Message----- From: AF <af-boun...@af.afmug.com> On Behalf Of Seth Mattinen Sent: Friday, August 7, 2020 2:49 PM To: af@af.afmug.com Subject: Re: [AFMUG] DC dual feed module for -48V? On 8/7/20 12:35, Ken Hohhof wrote: > Are you using the "DC OK" contacts, or you just want 2 x MOSFET "diodes" in a DIN rail box? If the schematic diagram on the Mean Well datasheet is to be taken literally, you could just hook it up backwards. (reverse IN and OUT) It looks like the two diodes aren't connected together internallya. I want A and B feeds to a single-feed device (Packetflux Rackinjector). No problem with floating power supplies for other voltages. But it won't work in reverse because internally the (-) terminals are all tied together and on the -48V system (-) is where the breakers are which means then you're tying the A and B breaker outputs together (not good) and putting the diodes on ground/return (which is useless). > > What are you powering that needs negative power wrt ground? The rectifier shelf and its batteries have return (+) bonded to ground and breakers on (-). -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com
