Juniper Networks M5 - Manual (Page 124)

Replace Power System Components
4. Unplug the power cord from the appliance inlet on the faceplate and from the power
source receptacle.
5. Insert the appliance coupler end of the replacement power cord into the appliance
inlet on the power supply faceplate and insert the plug 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.
6. Press the power switch on the power supply faceplate to the ON ( | ) position. Verify
that the blue OUTPUT OK LED eventually lights steadily.
When two power supplies are installed, at least one Routing Engine and one
FPC must also be installed for both power supplies to power on. In the
absence of this minimum load, only one power supply starts. (The router
powers on and operates correctly with one power supply, but without the
redundancy benefit of having a second power supply installed.)
Replace a DC Power Supply
A DC-powered router has two load-sharing, redundant DC power supplies that install into
the rear of the router as shown in Figure 3. Each power supply is hot-removable and
hot-insertable, as described in “Field-Replaceable Units (FRUs)” on page 3. When one
power supply fails or is powered down, the other power supply automatically assumes the
entire electrical load for the router. For more information about DC power supplies, see
“DC Power Supply” on page 18.
To replace a DC power supply, perform the following procedures:
•
Remove a DC Power Supply on page 104
•
Install a DC Power Supply on page 106
Remove a DC Power Supply
The DC power supplies are located at the bottom rear of the chassis, as shown in Figure 3.
Each DC power supply weighs approximately 7 lb (3.2 kg).
Do not leave a power supply slot empty for more than a short time while
the router is operational. The power supply must remain in the chassis
for proper airflow.
To remove a DC power supply, follow this procedure (see Figure 36):
104 M5 and M10 Internet Routers Hardware Guide