Table of Contents
Advertisement
Prevention of air recirculation
Attention: Consider these factors when planning for single or multiple rack
installations:
v When racks are positioned adjacent to each other, ensure that the racks fit tightly
v Air recirculation occurs over the top or around the side of a rack in a room that
Air filtration
The BladeCenter T unit comes with a bezel assembly containing a removable and
replaceable air filter. There are software features in the management-module that
detect a clogged filter and generate system alerts based on the severity of the
airflow reduction. The typical service interval for the filter is approximately three to
six months depending on your environment.
Room cooling
Attention: To prevent possible BladeCenter T thermal failures, proper room cooling
is vital:
v Ensure that the site cooling system has adequate capacity for the room cooling
v Ensure that cool air is provided to the front of the BladeCenter T unit and rack.
v Ensure that the room cooling system is positioned so warm exhaust air is
v A significant air temperature gradient can occur from the bottom to the top of a
Power connections for Type 8720
The BladeCenter T Type 8720 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.
64
BladeCenter T Types 8720 and 8730: Planning and Installation Guide
together from side to side to prevent inter-rack air recirculation from the back to
the front.
does not have a cooling system with sufficient airflow volume capacity. Ensure
that the cooling system has adequate capacity for the room cooling load.
load.
directed away from all BladeCenter T units towards the room cooling system
without passing in front of a BladeCenter T unit.
rack in a room that has a cooling system that does not have sufficient airflow
volume and cooling capacity. This may cause equipment at the top of the rack to
run hot, resulting in reduced reliability, component failure, data loss, or server
shutdown.
and VW1 rated.
33100–52600, and a wire insulation diameter of 12.8 mm to 13.1 mm.
wire.
Advertisement
Table of Contents
