Connecting Dc Power To A Qfx5200 - Juniper QFX5200 Hardware Manual

QFX5200 Switch Hardware Guide

Connecting DC Power to a QFX5200

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The QFX5200 is shipped from the factory with two power supplies. Each power supply
is a hot-removable and hot-insertable field-replaceable unit (FRU) when the second
power supply is installed and running. You can install replacement power supplies in the
two slots next to the fan modules without powering off the switch or disrupting the
switching function.
WARNING: A DC-powered QFX5200 is intended for installation only in a
restricted access location.
NOTE: The battery returns of the DC power supply must be connected as an
isolated DC return (DC-I).
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
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).
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. For instructions on
connecting earth ground, see
on page 64.
Install the power supply in the chassis. For instructions on installing a power supply in
a QFX5200, see "Installing a Power Supply in a QFX5200" on page
Ensure that you have the following parts and tools available:
DC power source cables (14–16 AWG) with ring lug (Molex 190700069 or equivalent)
(not provided)
Phillips (+) screwdriver, number 2 (not provided)
Multimeter (not provided)
"Connecting Earth Ground to a QFX5200"
Copyright © 2017, Juniper Networks, Inc.
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