Correct. +48 gear direct to the AD-155, including the input side of the
RSD, meaning + to +, - to -. The RSDs have 4kV i/o isolation. So what I
would do, to make sure you have everything commonly bonded on the
return/ground side, is take the + side of the output on the RSD straight
into your negative/return bus bar, terminal block strip or whatever you
have. Also take the FG (frame ground) of any and all power supplies,
DC-DC converters, surge suppressors, etc. to a common point.
Mixed systems are confusing until you wrap your mind around it. Return
is return. Make all systems common/single-point grounded and you
shouldn't have any issues.
On 1/5/2016 1:54 PM, Craig Baird wrote:
Great! Thanks! So let me make sure I'm clear on this. I'll connect
my +48v gear directly to the AD-155C. Then, put the RSD-200C in-line
between the AD-155C and the -48v gear. Is this right?
Craig
Quoting George Skorup <geo...@cbcast.com>:
Yup. Just use a RSD200C-48 and not worry about it.
On 1/5/2016 12:51 PM, Josh Baird wrote:
You need an isolated DC-DC converter between your +48V and -48V.
Look into the Meanwell RSD series (not the SD).
Specifically, take a look at the RSD-200C.
On Tue, Jan 5, 2016 at 1:47 PM, Craig Baird <cr...@xpressweb.com
<mailto:cr...@xpressweb.com>> wrote:
I have a terrible time wrapping my head around -48vdc. I'm hoping
you guys can help. I've got a Cambium PTP820S that I'm going to
be putting on the same tower with several Mimosa B5s. The 820S is
apparently -48vdc, while it appears the Mimosa is +48vdc. I'd
like to power both with a Meanwell AD-155C with a 48v battery
string. So... what are my implications here? Will having both
-48 and +48 radios on the same tower, coming from the same power
supply end up shorting through the tower? What's the best way to
do this short of using two separate power supplies and battery
strings?
Thanks!
Craig
