Juniper M120 - Replacing an M120 DC Power Supply; Removing an M120 DC Power Supply

13. Insert the power cord plugs into an AC power source receptacle. Verify that the power
cord does not block access to router components or drape where people could trip
on it.
NOTE: Each AC power supply has two AC appliance inlets. Each power
supply must be connected to a dedicated AC power feed. For 100-120
VAC, both inlets are used. For 200-240 VAC, only the top inlet is used. For
information about site power preparations, see “M120 Router Power
Requirements” on page 88. For information about connecting the router
to power and ground, see “Connecting Power to an AC-Powered M120
Router” on page 167.
14. Switch the power switch on the power supply faceplate to the on position (|). Verify
that the status LED on the power supply faceplate blinks, then lights steadily
approximately one minute after you switch on the power switch.
Related
Documentation
M120 AC Power Supply Description on page 72•
• Maintaining the M120 Power Supplies on page 277
• Electrical Specifications for the M120 AC Power Supply on page 95
Replacing an M120 DC Power Supply
In the DC power configuration, the router contains two DC power supplies (see Figure 20
on page 72), located in the right rear of the chassis in slots PEM0 and PEM1 (left to right).
A single DC power supply provides sufficient power for a fully configured router.
Each power supply (AC or DC) is hot-insertable and hot-removable.
NOTE: To maintain proper cooling and prevent thermal shutdown of the
operating power supply unit, each power supply slot must contain either a
power supply or a blank panel. If you remove a power supply, you must install
a replacement power supply or a blank panel shortly after the removal.
•
Removing an M120 DC Power Supply on page 245
•
Installing an M120 DC Power Supply on page 248
Removing an M120 DC Power Supply
The power supplies are located at the rear of the chassis to the right of the CB1. Each
power supply weighs approximately 8.4 lb (3.8 kg).
245Copyright © 2018, Juniper Networks, Inc.
Chapter 28: Replacing Power System Components