NEC Server 140Rc-4 - Manual (Page 297)

Upgrading Your Server 9-11
Power Supply Unit
Even if a single power supply unit fails, the server can continue its operation without interruption
when additional power supply unit is installed (in the redundant configuration).
Installation
Take the following steps to install a power supply unit:
1. See the section "Preparing for Installation and Removal" described earlier to prepare.
2. Loosen a screw to remove the blank cover.
IMPORTANT: Keep the removed blank cover for future use.
3. Slide the power supply unit into the vacant slot until you feel resistance.
IMPORTANT: The power supply unit engaging its connector causes
the resistance. To avoid damaging the power supply unit, do not tilt or
twist the unit as you push it into the connector.
4. Push the power supply unit into the slot until the locking tab snaps into place.
5. Tighten the captive screw that retains the power supply unit.
PS1 slot
(indicated as PS1/AC1)
PS2 slot
(indicated as PS_SHARE)
PS3 slot
(indicated as PS2/AC2)
Screw