Juniper QFX5100, Hardware Manual

Page: 194 / 256

CAUTION: Replace a failed power supply with a blank panel or new power
supply within 1 minute of removal to prevent chassis overheating.
Related
Documentation
AC Power Supply for a QFX5100 Switch on page 35
•
•
AC Power Supply LEDs on a QFX5100 Switch on page 220
Connecting DC Power to a QFX5100 Switch
The power supply in a QFX5100 switch 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.
WARNING: DC-powered QFX5100 switches are intended for installation only
in a restricted access location.
NOTE: The battery returns of the DC power supply should 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 142 ).
•
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
“Connecting Earth Ground to a QFX5100
Switch” on page 172 .
•
Install the power supply in the chassis. For instructions on installing a power supply in
a QFX5100 switch, see
“Installing a Power Supply in a QFX5100 Switch” on page 194 .
Copyright © 2014, Juniper Networks, Inc. 176
QFX5100 Switch Hardware Guide