Chuck, Are you sure the eltek's don't have the chassis ground bonded to the positive output ?
So I'm assuming the complication here is that if you reverse the wires, when you try to power a +48v device, and it's negative input is bonded to chassis ground and you have a ground path between the two (like a metal rack) or possibly somehow through the AC ground/neutral you cause a direct short circuit? I see mentions of DC-DC converters, but I don't see the point of using a 300w RSD converter with a 2000W rectifier shelf? On Mon, Nov 26, 2018 at 2:57 PM <ch...@wbmfg.com> wrote: > It is 48. Period. You choose the reference if you want one. > > If you tie the + terminal to chassis ground then the – terminal is the hot > –48 VDC terminal. > > If you tie the – terminal to chassis ground then the + terminal is the hot > +48 VDC terminal. > > If you don’t tie either to chassis ground, then you will have to have a > common return bar that is on the opposite rail from your fuses and circuit > breakers. > > *From:* TJ Trout > *Sent:* Monday, November 26, 2018 3:40 PM > *To:* AnimalFarm Microwave Users Group > *Subject:* [AFMUG] Eltek Valere J series -48 or +48 > > I'm looking at the Valere series and I can't seem determine if it's +48 or > -48, seems like it's +48 but I thought all the telecom stuff was positive > ground. > > How do you go about powering negative ground loads from a positive ground > power source? > > I'm assuming you can leave out the neutral and isolate the chassis? > > > > ------------------------------ > -- > 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 >
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