Connecting Dc Power To A Qfx5100 Device - Juniper QFX5100 Hardware Manual

QFX5100 Switch Hardware Guide
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Connecting DC Power to a QFX5100 Device

174
CAUTION: A system reboot with Routing Engine FPGA version 7.1 might
not successfully boot the Junos OS software. In case of a system reboot
failure, you need to power cycle the switch. To check the current FPGA
version, issue the
AC Power Supply for a QFX5100 Device on page 47
AC Power Supply LEDs on a QFX5100 Device on page 61
The QFX5100 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: DC-powered QFX5100 devices are 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
Device" on page
command.
show chassis firmware
"Connecting Earth Ground to a QFX5100
170.
Copyright © 2016, Juniper Networks, Inc.
263).