Bothgrids ina power redundant system should have the same number of power supplies. If your
systemis configured for grid redundancy, slots 1 and 2 are assigned to grid 1 and slots 3 and 4 are
assignedto grid 2. If only two power supplies (PS) are in a redundant- mode chassis, they should be
inslots 1 and 3. Slot and cord connection numbering is shown below.
Figure 25: Power Supply Bay and Connector Numbering
PS1 PS2 PS3 PS 4
ServerSlot1 ServerSlot2
ServerSlot3
ServerSlot5
ServerSlot7
ServerSlot4
ServerSlot6
ServerSlot8
Front
Fan1 Fan2
I/OModuleSlot 1
I/OModuleSlot 2
Connector
PS4
Connector
PS3
Connector
PS2
Connector
PS1
Fan6
Fan5
Fan4
Fan3
Fan8
Fan7
Rear
279770
Note
Step 6 Connectthe server chassis to the fabric interconnect as described in Proper FEX and Fabric Interconnect Port
Connectivity, on page 48.
Connecting a DC Power Supply
Thissection describes how to connect power to the rear PDU terminals on the DC version chassis
(UCSB-5108-DC)corresponding to a UCS 5108 DC power supply (UCSB-PSU-2500DC48).

Required Tools

Youmust have the following tools to perform this procedure:
•APhillips screwdriver
•A10-mm wrenchor socket
•Connectorsand wire for the DC circuit or circuits

DC Power Installation Procedure

Whenstranded wiring is required, use approved wiring terminations, such as closed-loop or spade-type
withupturned lugs. These terminations should be the appropriate size for the wires and should clamp both
theinsulation andconductor. Statement 1002
Warning
Beforeperforming any of the followingprocedures, ensure thatpower is removedfrom theDC circuit.
Statement1003
Warning
Cisco UCS 5108 Server Chassis Installation Guide
44 OL-20035-05
Installation
Connecting a DC Power Supply