Installation Procedures
950-818-100-01, Revision 01
10
November 30, 1999
PCS-818 List 1
TB1 FGND Connection
The five-position power-terminal strip termination point, TB1, is on the COT shelf backplane. A minimum of
3.3 mm wire should be used for this connection. To connect the TB1 FGND connection, do the following:
1
Using a minimum of 3.3 mm wire, attach a spade lug connector to terminate the ground wire on the FGND
terminal of TB1.
2
Connect the other end of the frame ground wire to the CO Frame Ground termination point using locally
approved methods.
Power Connections
The TB1 termination point on the COT shelf backplane provides connections for dual –48 Vdc, common battery
return, and frame ground to each of the card slots by way of screw terminals. The COT shelf can be wired for
redundant powering, or single-source powering depending upon requirements. The following sections describe
the two powering options available on this device. The preferred powering method is redundant-COT shelf
powering. Prior to performing any power connections:
1
Remove all fuses in the equipment bay's fuse panel for the circuit where the PG-Flex
Plus
–48 Vdc power leads
are terminated until the COT shelf is wired and ready for turn-up.
2
Run the battery and battery return lines from the fuse panel to the COT shelf mounting frame using a
minimum of 3.3 mm wire.
3
Connect to a reliably grounded –48 Vdc source that is electrically isolated from the AC source.
4
The branch circuit overcurrent protection shall be rated –48 Vdc, 20 A maximum. Refer to the appropriate
COLU Technical Practice to determine whether fusing values less than 15 Amp can be used or see
for detail information about “PCS-818 Shelf Supply Current”.
5
Disconnect both input supply sources before servicing.
