in the two slots next to the fan modules without powering off the switch or disrupting
the switching function.
WARNING: A DC-powered QFX5110 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 thatyou have taken the necessaryprecautions to prevent electrostatic discharge
(ESD) damage (see “Prevention of Electrostatic Discharge Damage” on page 182).
•
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 cablelug 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 “Connecting Earth Ground to a QFX5110” on
page 84.
•
Install the power supply in the chassis. For instructions on installing a power supply in
a QFX5110, see “Installing a Power Supply in a QFX5110” on page 109.
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)
To connect DC power to a QFX5110:
1. Attach the grounding strap to your bare wrist and to a site ESD point.
2. Verify that the DC power cables are correctly labeled before making connections to
the power supply. In a typical power distribution scheme where the return is connected
Copyright © 2017, Juniper Networks, Inc.88
QFX5110 Switch Hardware Guide
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