Lenovo ThinkSystem SD550 V3 System Configuration Manual page 36

Figure 8. Chassis midplane location and connectors
PSU cage
1
Chassis midplane
2
PSU cage: For the PSU slots, see
1
Chassis midplane: For the replacement of the PSU cage and Chassis midplane, see "PSU cage and
2
chassis midplane replacement" in the User Guide or Hardware Maintenance Guide.
PDB connectors: When a node is installed in the chassis, the power distribution board (PDB) in the node is
3
connected to the corresponding connector on the chassis midplane.
PSU connectors: When a hot-swap power supply unit (PSU) is installed in the PSU cage, the PSU is
4
connected to the corresponding connector on the chassis midplane.
Notes:
• The firmware of the chassis midplane can be updated via Lenovo XClarity Controller (XCC) and Lenovo
XClarity Essentials OneCLI (LXCE OneCLI). Only the caretaker node can perform this update.
• By default, the caretaker node is automatically selected by the PSoC firmware on the chassis midplane,
unless otherwise designated.
• Go to for more information on firmware updating tools.
ThinkSystem SD550 V3 System Configuration Guide
28
PDB connectors
3
PSU connectors
4
"Chassis rear view" on page 23.