Rear Panel - Lenovo RackSwitch G8272 Installation Manual

Rear Panel

Fans
Power Supply
© Copyright Lenovo Corp. 2014
Up to four hot-swap fans cool the switch unit. Three fans are required for normal
operation. If an individual fan fails, the other fans continue to run, and the switch unit
continues to operate normally. You can replace a hot-swap fan module while the
switch is operating.
Fan operation and internal temperatures are monitored. If the air temperature
exceeds a desired threshold, the environmental monitor displays warning
messages.
Note: If a fan fails, the maximum operating temperature drops from +40°C (104°F)
to +35°C (95°F).
The switch has two hot-swap redundant 450 W AC power supplies. Each internal
power supply has an individual IEC 320 power connector on the rear panel. The
power cord attaches to a universal grounded AC power source. You can replace a
hot-swap power supply module without powering off the switch or disrupting switch
functions.
DANGER
An electrical outlet that is not correctly wired could place hazardous
voltage on the metal parts of the system or the devices that attach to the
system. It is the responsibility of the customer to ensure that the outlet is
correctly wired and grounded to prevent an electrical shock. (D004)
Each power supply can be connected to a separate AC circuit to mitigate the risk of
down time during a power failure. When used in a redundant configuration, the dual
power supplies have a load-sharing capability that enables each power supply to
operate at approximately 50 percent of full load. Using redundant power can
minimize the power disruption during a power supply failure and extend the
expected lifetime of each power supply by operating normally in a conservative
power mode.
There is no power switch on the G8272; the switch unit powers up when power is
supplied through the power cords.
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Chapter 1: Introduction