Chassis and Power Supplies
Power Supplies
OmniSwitch 6900 Hardware Users Guide
June 2020
page 3-53
DC Power Supply Connections
Connecting a DC Cable Harness to the Chassis Power Supply
When plugging in the cable, insert the connector end of the cable harness into the power supply connector
until it clicks firmly into place. This is an indication that the connector is secure and properly seated.
Connecting a DC Cable Harness to the DC Power Source
Safety Guidelines
Before connecting the DC cable to a power source, be sure to follow these important guidelines:
•
Review all manufacturer specifications and requirements for DC power supplies and cables
before connecting.
•
Connect to a reliably ground -48VDC Selv source.
•
The branch circuit overcurrent protection must be rated 15A.
•
Use 12AWG copper conductors.
•
A readily accessible disconnect device that is suitably approved and rated shall be incorporated in the
field wiring.
•
The power source must be installed in a restricted access location.
Primary Ground Information
The product has been designed to be installed in a Common Bonding Network (CBN). The pin of the
Green/Yellow ground lead in the three pin cable connector is connected to the ground connector on the
DC power supply, which is identified by a Grounding symbol. The Green/Yellow lead wire at the other
end of the cable must be connected to a proper earth ground point.
The rear chassis has two ground holes. To properly ground the equipment, connect a Panduit Corporation
UL listed Lug, (Part number LCD8-10A-L) to the two threaded holes located at the rear, insert two 10-32,
3/8” threaded pan head screws into these ground holes, and connect them to a proper earth ground point,
using protective earthing conductor wire and 8AWG copper conductors.
Connection Details
Connect the power supply using the supplied DC cable. The cable consists of three 12AWG wires
(Green/Yellow, Black, Red).
One end of the cable has a three pin connector in a plastic housing that is inserted into a three pin input
connector on the power supply. The other end of the cable is connected to a fuse panel or other source of
-48VDC power.
Observe proper polarity when connecting to a fuse panel. The cable wire leads must be connected as
follows:
•
Green/yellow - ground
•
Black - return
•
Red - -48VDC
Note.
The battery return conductor is an Isolated DC Return (DC-1).
