HP BL20p - ProLiant - G2 Setup And Installation Manual page 72

Figure 4-19: Unlocking and setting the circuit breaker
to on
6. Be sure that the hot-plug power supply LEDs, power enclosure DC power LEDs,
and bus bar power LEDs are green. Refer to Appendix D, "LEDs and Switches."
IMPORTANT: Only unlock circuit breakers for couplers that are attached to a server
blade enclosure.
7. Unlock the circuit breaker switches on the bus bars or power bus boxes and set
the switches to on. This action applies DC power to the server blade enclosures.
8. Be sure that the server blade enclosure DC power LEDs are green. Refer to
Appendix D, "LEDs and Switches."
9. Be sure to lock all the circuit breaker switches in the on position. This action
prevents anyone from accidentally powering down the system.
NOTE: Circuit breakers continue to function in the event of an overload condition even if
they are locked.
Power is now applied to all system hardware.
HP ProLiant BL p-Class System Setup and Installation Guide
Cabling and Powering Up the System
4-27