Note: The device can operate all the ports with two fan assemblies if you do not require redundancy.
The device fans are fixed inside the fan assemblies to provide necessary airflow to cool the whole system.
There are two fans located in each unit. The system software sets fan speed and measures fan speed
through the tachometer interface.
Precautions specific to the fan assemblies
CAUTION:
Disassembling any part of the power supply and fan assembly voids the warranty and
regulatory certifications. There are no user-serviceable parts inside the power supply and
fan assembly.
CAUTION:
Ensure that the airflow direction of the power supply unit matches that of the installed
fan tray. The power supplies and fan trays are clearly labeled with either a green arrow
with an "E", or an orange arrow with an "I."
CAUTION:
If you do not install a module or a power supply in a slot, you must keep the slot filler
panel in place. If you run the chassis with an uncovered slot, the system will overheat.
18-32kg(39.7-70.5lbs)
svc00167
CAUTION:
To prevent damage to the chassis and components, never attempt to lift the chassis using
the fan or power supply handles. These handles were not designed to support the weight
of the chassis.
Note: The equipment installation must meet NEC/CEC code requirements. Consult local authorities for
regulations.
Identifying the airflow direction
The power supply and fan assemblies are identified by the following airflow directions:
v Intake power supply and fan assembly with an orange "I" label or without any label: Pulls air from
the nonport-side of the switch and exhausts it out the port side.
v Nonport-side air intake
v Port-side air exhaust
v Back-to-front (nonport-side to port-side) airflow
v Part numbers ending with -R
v Exhaust power supply and fan assembly with a green "E" label: Pulls air from the port side of the
switch and exhausts it out the nonport-side.
66 SAN128B-6 Installation, Service, and User Guide
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