Power cabling from site power to the chassis is accomplished with rear cabinet side-wall mounted AC feeder boxes connected to site power and rear cabinet side-wall mounted PDUs for distribution from the AC feeder boxes to the chassis.
All left and right references are from the rear view of the cabinet.
AC Feeder Boxes
- Input power connection to site power may be through the bottom or the top of the cabinet.
- Each cabinet contains two or four AC feeder boxes depending on the power configuration.
- Two site power cord configurations have two AC feeder boxes, one on each side.
- Each AC feeder box has six circuit breakers controlling six output power outlets used by the PDUs.
- The AC feeder boxes and input power cords are labeled A and B.
- Four site power cord configurations have four AC feeder boxes, two on each side.
- Each AC feeder box has three circuit breakers controlling three output power outlets used by the PDUs.
- The AC feeder boxes and input power cords are labeled A lower, A upper and B lower, B upper.
- Each circuit breaker on the AC feeder box controls PDU U space outlets according to the labels attached directly above each circuit breaker.
PDUs
- There are two PDUs mounted on each side of the rear cabinet side-wall.
- Each PDU has three input power cords for a total of six power cords per side of cabinet.
- PDU input power cords are labeled 1 through 6 from bottom to top for both the left and right sides of the cabinet.
- Each PDU has 21 chassis power cord outlets for a total of 42 chassis power cord outlets for both the left and right sides of the cabinet.
- Each outlet corresponds to a U space in the cabinet.
- Typically, each chassis plugs into the outlet aligning with its lowest occupied U space.Examples:
- 2U storage array occupies U spaces 2 and 3. The chassis is plugged into outlets at U2.
- 2U node occupies U spaces 11 and 12. The chassis is plugged into U11.
- 1U node occupies U space 18. The chassis is plugged into U18.
- The standard for all chassis with two power supplies at the rear of the cabinet is:
- All outlets on the right side of the chassis plug into the right PDU. For example, the Dell R720 chassis port PS2 plugs into right PDU.
- All outlets on the left side of the chassis plug into the left PDU. For example, Dell R720 chassis port PS1 plugs into left PDU.
PS1 or PS2 may be on the left or right side of the chassis. For PS1 and PS2 locations for each chassis, see the Chassis Port Reference. - The cabinet attic does not have its own outlet. For server management switches that do not have dual AC power inlets, the primary (lower) switch is plugged into the left outlet (left AC leg) at U1. The secondary (upper) switch is plugged into the right outlet (right AC leg) at U1.
- Each PDU outlet has a chassis ID label corresponding to the chassis that plugs into the outlet.
- When replacing chassis, always note the outlet used for each of the existing cords before unplugging them.