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Chapter 2. BladeCenter HT unit power, components, and
indicators
This section contains power requirements, component information, and it identifies
light-emitting diodes (LEDs) for the BladeCenter HT unit.
Supplying power to the BladeCenter HT unit
The BladeCenter HT unit does not have a power switch. The BladeCenter HT unit
has four power connectors; each powers a power module. As viewed from the rear
of the BladeCenter HT unit, power connector 1 (top-right connector) supplies power
to power-module bay 1, power connector 2 (bottom-left connector) supplies power
to power module 2, power connector 3 (top-left connector) supplies power to power
module 3, and power connector 4 (bottom-right connector) supplies power to power
module 4.
Power modules 1 and 2 are redundant and provide power to blade bays 1 through
6, while power modules 3 and 4 are redundant and provide power to blade bays 7
through 12. To ensure power redundancy, a typical power configuration is to supply
power to power connectors 1 and 4 from one power source location, while
supplying power to power connectors 2 and 3 from another power source location.
Important: The release handles on the fan shuttle have a safety switch that
disables power output from the power boxes. If the release handles are not secured
to the chassis with the thumbscrews, the BladeCenter HT unit will not power on.
© Copyright IBM Corp. 2008
IN 3
Power module 3
External
"B" power
source
(left side
from rear)
Power module 4
IN 2
Power module 1
IN 1
Power module 2
IN 4
External
"A" power
source
(right side
from rear)
13
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