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Step 9. Verify that the Unit Emergency Power Off (UEPO) Switch is in
the Off Position
Note: UEPO refers to the red Unit Emergency Power Off switch located on the unit. EPO refers to the
computer room Emergency Power off.
The unit emergency power off (UEPO) switch is located on the front of the system rack. When the switch
is tripped, utility power is confined to the machine power compartment. All volatile data is lost.
Computer Room Emergency Power Off (EPO)
Attention:
When the integrated battery feature (IBF) is installed and the room EPO is turned off, the
batteries engage and the system continues to run. It is possible to attach the computer room EPO system
to the machine UEPO. When this is done, turning off the room EPO disconnects all power from the power
cords and the IBF unit. In this event, all volatile data is lost.
To incorporate the IBF into the room EPO, a cable connection must be made to connect to the rear of the
system UEPO panel. The following diagrams illustrate how to make the connection.
This illustration shows the rear of the machine UEPO panel with the room EPO cable plugging into the
machine. The switch actuator located at the bottom of the UEPO must be switched to the "active" position.
After the switch actuator is moved to "active" and makes the cable connection possible, the room EPO
cable must be installed for the machine to power on.
The following illustration shows the AMP connector (part number 770019-1) needed to connect to the
system UEPO panel. For room EPO cables using wire sizes #20 AWG to #24 AWG, use AMP pins (part
number 770010-4).
A Side BPC
B Side BPC
UEPO Switch
I
O
Room EPO Cable
Front
View
Switch in the
Active Position
J00
J01
J02
Rear
View
Chapter 2. Installing the pSeries 655
13
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