IBM BladeCenter HT 8740, Problem Determination And Service Manual

Page: 29 / 158

Disconnecting power from the BladeCenter HT unit
You can shut down the BladeCenter HT unit by turning off the blade servers and
disconnecting the BladeCenter HT unit from the power source.
To disconnect power from the BladeCenter HT unit, complete the following steps:
1. Shut down each blade server. See the documentation that comes with your
blade servers for the procedure for shutting down the operating system.
2. Disconnect power from the BladeCenter HT unit.
Note: After you disconnect the BladeCenter HT unit from power, wait at least 5
seconds before you connect the BladeCenter HT unit to power again.
v
BladeCenter HT type 8740:
a. Make sure the blade servers are powered off.
Statement 33:
CAUTION:
This device does not provide a power control button. Removing
power supply modules or turning off the server blades does not turn
off the electrical current supplied to the device. The device also
might have more than one power cord. To remove all electrical
current from the device, ensure that all power cords are
disconnected from the power source.
Attention: Only trained service personnel, other than IBM service
technicians, are authorized to make the connections to and
disconnections from the -48 volt dc power source. IBM service
technicians are not certified or authorized to install or remove the -48 volt
power cable. The customer is responsible for ensuring that only trained
service personnel install or remove the -48 volt power cable.
b. Turn off the power source.
c. Remove the dc terminal cover for each power terminal. See “Removing a
dc terminal cover” on page 86 for more information.
Chapter 1. Introduction
11