CHAPTER 28
Replacing Power System Components
•
Replacing an M120 AC Power Supply on page 239
•
Replacing an M120 AC Power Supply Cord on page 244
•
Replacing an M120 DC Power Supply on page 245
•
Replacing an M120 DC Power Supply Cable on page 251
Replacing an M120 AC Power Supply
In the AC power configuration, the router has two AC power supplies (see Figure 21 on
page 73), located at the rear of the chassis in slots PEM0 and PEM1 (left to right). Each
AC power supply provides power to all components in the router. The AC power supplies
are fully redundant and current is shared almost equally in a fully configured system. In
a fully configured router, if one power supply fails or is removed, the remaining power
supply instantly assumes the entire electrical load.
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 AC Power Supply on page 239
•
Installing an M120 AC Power Supply on page 242
Removing an M120 AC 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).
CAUTION: Do not leave a power supply slot empty for more than 30 minutes
while the router is operational. For proper airflow, the power supply must
remain in the chassis, or a blank panel must be used in an empty slot.
239Copyright © 2018, Juniper Networks, Inc.
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