Lenovo ThinkSystem SD550 V3 User Manual page 38

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
2
chassis midplane replacement" on page
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 "Update the firmware" on page 231
ThinkSystem SD550 V3 User Guide
28
PDB connectors
3
PSU connectors
4
"Chassis rear view" on page
66.
for more information on firmware updating tools.
23.
"PSU cage and