Connecting The Bladecenter T Type 8720 To Dc Power - IBM BladeCenter T 8720 Installation And User Manual

Connecting the BladeCenter T type 8720 to dc power

The BladeCenter T Type 8720 unit comes with one pair of dc hot-swap power
modules in power-module bays 1 and 2. Each active power module supplies 12-volt
power to the blade bay that it services. The BladeCenter T unit supports a second
pair of power modules in power-module bays 3 and 4. Power modules are not
needed in bays 3 and 4 unless you install blade servers and options in blade bays
5 through 8, or I/O modules in I/O-module bays 3 or 4.
The BladeCenter T unit does not have a power switch. The BladeCenter T Type
8720 (dc power) unit has two dc-power terminal connectors each powering two
power modules. The left connection (looking from the rear) supplies power to
power-module bays 2 and 4, and the connection on the right supplies power to
power-module bays 1 and 3. Each dc terminal has four #M6 (0.25-inch) studs, one
for -48 V dc, one for RETURN, and two for connecting the safety ground wire. The
following guidelines are provided for connecting to the -48 V dc power source:
v DC wire rating of 4AWG (7x7x34/36 TC), 105C, 300V UL 10198, CSA approved
v Ring terminal designed for M6 stud, 4AWG wire, wire size (circular Mil area) of
v A two-lug ring terminal, required by NEBS for connecting the single safety ground
To provide true redundant power, BladeCenter T power modules 1 and 3 must be
connected to a different power source than power modules 2 and 4.
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BladeCenter T Types 8720 and 8730: Installation and User's Guide
Return
and VW1 rated
33100-52600, and a wire insulation diameter of 12.8 mm to 13.1 mm
wire
Safety ground
Return
-48 vdc
Captive screws