No I got it. It just didn't completely filter through my brain.
The thing that I forgot was when I was trying to monitor through a
SiteMonitor (which *__DOES__* ground the negative (-) terminal) and also
supplying 48 volts to a Trango Apex. I kept popping fuses to the Trango
until I figured out how to isolate the Trango from the SiteMonitor.
The hassle is the things that ground one side or the other (like the
SiteMonitor and the Trangos).
bp
<part15sbs{at}gmail{dot}com>
On 4/19/2017 6:51 PM, George Skorup wrote:
Well, Bill, I tried to reply to your other thread from yesterday about
this. Apparently it didn't make it to the list. All of the Trango
stuff (Giga & Apex) has always been -48 and 0v/+ chassis bonded, no
floating.
On 4/19/2017 8:41 PM, Bill Prince wrote:
I thought all the Trangos (Apex, Apex Plus, Apex Lynx) were +48V and
they ground the - terminal?
Opposite most others that declare -48V (and ground the + terminal).
But "most" of them actually float both terminals.
bp
<part15sbs{at}gmail{dot}com>
On 4/19/2017 6:22 PM, George Skorup wrote:
Most 48v supplies are floating on the output side. I regularly use
Mean Well MDR-100-48's for failed Trango ApexPlus power supplies
(which *do* have the +/0v side tied to the earth side of the AC
cord, BTW). The big capacitor in those usually blow from heat. The
MDR works fine with the + side going to earth/ground, essentially
making a "-48" supply.
I remember that the original Apex power supply was just a brick, but
I don't recall if it had a grounded/3-position AC line cord though.
If you're talking Apex, make sure the supply is at least 1.25A or
so. If ApexPlus, you're going to want at least 1.75A. And obviously
you don't want a supply that ties the negative side to ground.
On 4/19/2017 8:10 PM, Cassidy B. Larson wrote:
I have a trango apex power supply that bit the dust. Says -48v on
it. I don't have a spare -48v. Thoughts on quickest way to restore
it to service? I got plenty of saf ones that show 48v.
