Hitachi Compute Rack 220H Getting Started Manual page 52

Uninterruptible power supply (UPS)
An uninterruptible power supply (UPS) supplies AC power when a power failure
occurs or a circuit breaker is shut off, stopping AC power for the system unit.
The UPS you use has to accommodate the type of AC cable used for the system
unit. The UPS also has to support the OS used in the system unit.
For information about hardware settings of a UPS, see the manual of the UPS.
Figure 3-12: Connecting AC cable to UPS
3-12
If you use a UPS, the system unit will not automatically start even
when AC power is resumed after shutdown caused by a power failure or
other reason.
In order for the system unit to automatically start, you need UPS
management software. For details, contact the sales representative.
You also need to change the settings of the system BIOS Restore AC
Power Loss to Power On. See Hitachi Compute Rack 210H/220H BIOS
Guide.
If you install a power supply (BP2361-Y/BP2361-R), you need two AC
cables.
Hitachi Compute Rack 220H Getting Started Guide
Installation