Scientific Atlanta Continuum DVP eXtra Dense QAM Array, System Manual

Page: 55 / 112

Connection of Scientific-Atlanta Equipment to DC Power Sources
General
Some Scientific-Atlanta products can be powered by dc power supplies.
In general two categories of dc power supply systems are considered:
•
-48 V dc Nominal Voltage systems with absolute maximum values below 60 Vdc
(SELV).
•
-48 to –60 V dc Nominal Voltage systems with absolute maximum values below 75
V dc. (NON SELV)
For the allowable nominal voltage, refer to the Ratings/Identification label on your
product.
-48 V dc Power Source
For equipment designed to be powered by a –48 V dc power source, and having a
Normal Service Voltage Range not exceeding –38 to –58 V dc, the following safety
warnings and guidelines apply:
•
Independent units and chassis must be connected to the –48 V dc power source
either via the mating field wiring connector with screw terminals or via the
provided dc power cable. Furthermore, the following applies:
−
Use a listed dc rated Branch Circuit protection in accordance with the wire size,
and with a maximum of 15 A current. The circuit protection must be placed in
the hot wire.
−
We recommend a minimum of 1.5 mm² (or AWG16) for 15 A fusing.
−
The -48 V dc power source must comply with the safety extra-low voltage
(SELV) requirements in the UL 1950 (UL60950), CSA C22.2 No. 950, CSA C22.2
No. 60950, EN 60950 and IEC 60950 standards.
−
The -48 V dc power source must be electrically isolated from the AC source in
accordance with the standard of the country where you are installing the
product.
−
The wire size of the cable used to connect a product to the dc distribution mod-
ule or bus bar must have the appropriate wire size to avoid overloading.
−
Always wire the protective earth terminal of the dc power supply connector or
cable.
Continued on next page
4004949 Rev C Installation 2-19