I'm about to do the exact opposite - convert +48V to -48V to power a radio. I have an RSD in between. Should I take extra care to ensure that the RSD does not touch the metal enclosure in any way? I was also planning on floating the radio's ground (and the RSD).
On Wed, Aug 19, 2015 at 5:32 PM, Jason McKemie < j.mcke...@veloxinetbroadband.com> wrote: > Good point, the damn thing is mounted to the same rack as the -48v unit > right now. I believe the -48v unit is isolated from the rack, but I had > better make sure before I switch the Mikrotik over to DC power. > > -Jason > > On Wed, Aug 19, 2015 at 4:22 PM, <ch...@wbmfg.com> wrote: > >> Set it on a cardboard box. (With a sticky note warning not to touch >> case...) >> >> *From:* Jason McKemie <j.mcke...@veloxinetbroadband.com> >> *Sent:* Wednesday, August 19, 2015 3:11 PM >> *To:* af@afmug.com >> *Subject:* Re: [AFMUG] Mixing +48v and -48v >> >> I'll probably just float the ground. >> >> On Wednesday, August 19, 2015, Josh Baird <joshba...@gmail.com> wrote: >> >>> They are hard to find. Where will you ground the MT in this type of >>> scenario (with an RSD in between your -48V rectifier and MT)? >>> >>> Josh >>> >>> On Tue, Aug 18, 2015 at 11:31 PM, Jason McKemie < >>> javascript:_e(%7B%7D,'cvml','j.mcke...@veloxinetbroadband.com');> wrote: >>> >>>> It actually looks like the RSD-100C-24 should do the trick (I'm >>>> dropping to 24v, so I guess my subject line wasn't exactly correct). My >>>> normal source is out of those, according to their website they have some >>>> RSD-200C-48 units though. >>>> >>>> On Tue, Aug 18, 2015 at 7:58 PM, George Skorup < >>>> javascript:_e(%7B%7D,'cvml','geo...@cbcast.com');> wrote: >>>> >>>>> The Mean Well RSD gives 4kV i/o isolation and will work perfectly >>>>> this, no grounding issues. I think the smallest you can get in 48/48 is >>>>> 200W, the RSD-200C-48. Good luck finding some. >>>>> >>>>> >>>>> On 8/18/2015 7:20 PM, Jason McKemie wrote: >>>>> >>>>>> I'm wanting to power a mikrotik switch off of a -48v rectifier setup >>>>>> that already has some -48v equipment running on it. I'll be using a >>>>>> Meanwell DC/DC converter, which appears to not bond anything with the >>>>>> ground. The mikrotik, however, does bond the negative with ground. Do I >>>>>> need to keep the mikrotik's ground isolated from the main ground? Or is >>>>>> the >>>>>> DC/DC converter going to keep things from going boom? >>>>>> >>>>> >>>>> >>>> >>> >>> >> >
