CHAPTER 14
Replacing Power Supplies
•
Installing a Power Supply in a QFX5110 on page 109
•
Removing a Power Supply from a QFX5110 on page 111
Installing a Power Supply in a QFX5110
All QFX5110 switches, except the QFX5110-32Q-CHAS are 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.
•
Before you install a power supply in a QFX5110, ensure that you have taken the necessary
precautions to prevent electrostatic discharge (ESD) damage (see “Prevention of
Electrostatic Discharge Damage” on page 182).
•
Ensure that the airflow direction of the power supply is the same as the chassis. Labels
on the power supply handle indicate the direction of airflow. See “QFX5110 Cooling
System and Airflow” on page 25 for more information.
To install a power supply in a QFX5110 (see Figure 43 on page 110):
1. Attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD
point on the chassis.
2. Taking care not to touch power supply components, pins, leads, or solder connections,
remove the power supply from its bag.
CAUTION: Verify that the direction of the arrow on the power supply
handle matches the direction of airflow in the chassis. Ensure that each
power supply you install in the chassis has the same airflow direction. If
you install power supplies with two different airflow directions, Junos OS
raises an alarm, and the status (ALM) LED blinks amber.
3. Using both hands, lift the power supply and place it over the EMI gasket (if present)
in the power supply slot and slide the power supply into place.
109Copyright © 2017, Juniper Networks, Inc.
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