Replacing Redundant Ac Power Supplies In An Ex4500 Switch Without Disrupting Switch Functions - Juniper EX4500 Hardware Manual

Replacing Redundant AC Power Supplies in an EX4500 Switch Without
Disrupting Switch Functions
IN THIS SECTION
Replacing the Power Supply in the Top Slot | 195
Replacing the Power Supply in the Bottom Slot | 198
The power supplies in an EX4500 switch are field-replaceable units (FRUs) and are designed to be
hot-swapped while the switch is operating. You can remove and replace the power supply in the top slot
and the power supply in the bottom slot, one at a time, without disrupting switch functions.
Before replacing the power supplies in the switch:
Ensure that you have the correct replacement power supplies for your EX4500 switch model. The color
of the ejector lever on each power supply must match the color of the labels visible through the fan tray
vents.
Orange for Intake—The back-to-front model has an orange ejector lever on the power supplies and
an orange INTAKE label visible through the fan tray vents.
Green for Exhaust—The front-to-back model has a green ejector lever on the power supplies and a
green EXHAUST label visible through the fan tray vents.
CAUTION:
chassis to overheat.
Ensure that you understand how to prevent electrostatic discharge (ESD) damage (see
Electrostatic Discharge Damage" on page
If a grounding strap is not available, take these equivalent precautions:
Before removing a component, touch the exposed, bare metal of the switch to ground yourself before
handling the component.
Before installing a component, hold the component in its antistatic bag in one hand and touch the
exposed, bare metal of the switch with the other hand.
Operating the switch with an incorrect power supply might cause the
305).
194
"Prevention of