Connecting Chassis to Power Source Mounting OS6250 Switches
page 3-22 OmniSwitch 6250 Series Hardware Users Guide September 2009
Preliminary
9/28/09
OS6250-24MD Internal DC Power Supply Connections
The internal DC power supply has the following additional considerations. Refer to the installation steps
described in “OS6250-24MD Internal DC Power Supply Connections” on page 3-22
• Connect to a -48V or -60V reliably grounded DC SELV source.
• Use common DC return connections for the DC power supplies. The DC return terminal conductor
should be connected to the equipment frame.
• The Branch Circuit Overcurrent Protection must be rated a Maximum of 15A.
• Use 12AWG solid copper conductors only.
• A readily accessible disconnect device that is suitably approved and rated shall be incorporated in the
field wiring.
Backup DC Power Brick Connections
The backup DC power brick has the following additional considerations. Refer to the installation steps
described in “OS6250-24MD Internal DC Power Supply Connections” on page 3-22
• Connect to a -48V or -60V reliably grounded DC SELV source.
• Use common DC return connections for the DC power supplies. The DC return terminal conductor
should be connected to the equipment frame.
• The Branch Circuit Overcurrent Protection must be rated a Maximum of 5A.
• Use 22AWG solid copper conductors only.
• A readily accessible disconnect device that is suitably approved and rated shall be incorporated in the
field wiring.
Twisted pair wire (red and black) for a DC power supply
Note. Refer to the wiring diagram for information on connecting the DC power supply to a DC power
source.
MIN 1 TURN PER 1.5
HALF TURN PER .75
Black
Red
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