I have replaced Trango "-48" supplies with "+48" Mean Well MDR units.
The Trango POE box bonds the + side of the input terminal blocks to
ground anyway. So technically, yes, the "positive" side of the Mean Well
is earthed. It works fine.
And this is one power supply to one radio. Nothing else. No mixed + and
- return with multiple radios, that would be ungood.
On 6/21/2016 4:27 PM, [email protected] wrote:
By grounding at the supply, you would technically be creating a ground
loop. But this happens all the time when folks use positive grounded
power supplies on positive grounded loads. I don't think it would hurt
or help anything. It could make it obvious to some future technician
that this is a pos ground system. That could be a good thing.
Now, if you decided to power it with only one negative wire and trust
the building and tower grounds for the return.... things could get
dicey indeed.
-----Original Message----- From: [email protected]
Sent: Tuesday, June 21, 2016 12:14 PM
To: [email protected]
Subject: [AFMUG] -48v stupid question
My 48v power supply has floating ground on the DC side. It does have
a chassis ground, and the AC input has a ground.
So my DC side is -48 only by virtue of the equipment on the tower
having + grounded.
Should i go ahead and connect + to ground at the power supply? Seems
like that would make it official, but it's already working now.
Do i gain any safety or equipment protection by adding that ground
connection at the bottom? Would i add any danger or potential problems?
Sent from my iPhone
