Juniper QFX5220, Руководство по оборудованию, Страница: 136 / 247

6. If the AC power source outlet has a power switch, set it to the ON (|) position.
7. Verify that the AC and DC LEDs on each power supply are lit green.
If the amber fault LED is lit, remove power from the power supply, and replace the power supply (see
“How to Remove a Power Supply from a QFX5220” on page 157 ). Do not remove the power supply
until you have a replacement power supply ready: the power supplies must be installed in the switch
to ensure proper airflow.
How to Connect DC Power to a QFX5220-128C
The DC power supply in a QFX5220-128C is a hot-removable and hot-insertable field-replaceable unit
(FRU). You can remove and replace it without powering off the switch or disrupting switch functions. You
do, however, need to remove power from the power supply before attempting to remove the unit.
WARNING: DC-powered QFX5220-128C models are intended for installation only in a
restricted access location.
Before you begin connecting DC power to the switch:
•
Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage
(see “Prevention of Electrostatic Discharge Damage” on page 235 ).
•
Ensure that you have connected the switch chassis to earth ground.
CAUTION: Before you connect power to the switch, a licensed electrician must attach
a cable lug to the grounding and power cables that you supply. A cable with an
incorrectly attached lug can damage the switch (for example, by causing a short circuit).
NOTE: To meet safety and electromagnetic interference (EMI) requirements and to ensure proper
operation, you must connect the chassis to earth ground before you connect it to power. For
installations that require a separate grounding conductor to the chassis, use the protective earthing
terminal on the switch chassis to connect to the earth ground.
•
Install the power supplies in the chassis. For instructions, follow the instructions in “How to Install an
AC Power Supply in a QFX5220” on page 160 .
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