If you only need 300W of +48VDC load, it makes perfect sense. On Tue, Nov 27, 2018 at 1:31 AM TJ Trout <[email protected]> wrote:
> 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 <[email protected]> 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 >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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