Hitachi AMS 2100 Hardware Manual page 112

Power receptacles
Each power supply contains a power receptacle that must be connected to
a working AC power source using the supplied AC power cable.
NOTE: Hitachi Data Systems recommends that each power supply in the
base unit be connected to a different AC source in the rack. If one source
fails, the other source continues to supply power to the other power supply.
This keeps the array running until power is restored to the failed source.
Safety lock
The high-density expansion unit power supply includes a safety lock that
prevents the lock lever from being opened until the power cable is
disconnected from the power supply. This prevents the power supply from
being removed from the unit with the power applied.
As shown in
retainer that can be used to ensure that the power cable is not accidentally
disconnected from the power supply.
NOTE: Hitachi Data Systems recommends that you install the cable
retainer to prevent the power cable from accidentally being disconnected
from the power supply.
Figure 4-33: High-density Expansion Unit Power Supply Safety
4–40
Figure 4-33, the power supply also includes a power cable
Hardware components
Hitachi AMS 2100/2300 Storage System Hardware Guide
Components