The -48V RTN should be the 'positive' side and the POWER -48V should be
the 'negative' side. On normal installations the -48V is a black wire,
the -48V return is a red wire. It's like having a 'positive ground'.
(I've used, manufactured, sold, and installed 48V Telco gear.) On most
Telco gear both are isolated from earth ground - but you should check. A
current limited supply would be nice for initial startup, but I don't
think you'll have any issues. You should in any case, fuse it.
Ziggy
On 11/21/2012 09:10 AM, Fabio Eboli wrote:
Thank you, Peter and Paul.
Now I see that the pinout is almost identical
to LPRO-101, the only difference are pins
8 and 10 for power supply.
That's nice, I like the external C-Field control,
and monitor voltage for lamp, they can be useful.
I'm not familiar with telco power supplies,
I know only that they used 48V with positive
to ground.
So the supply should be 48V, positive
to pin 8 and negative to 10 ?
Should I expect the GND to be connected to pin
8? Or it will be floating at middle voltage
(hence the 19 to 32V rating), in this case
all I need will be a dual 24V psu.
Fabio.
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