Dc Power Supply In Ex4500 Switches - Juniper EX4500 Hardware Manual

DC Power Supply in EX4500 Switches

The DC power supply in EX4500 switches is a hot-insertable and hot-removable field-replaceable unit
(FRU).
EX4500 switches are shipped with one power supply. A cover panel is installed in the second power supply
slot. You can add a second power supply to the switch.
Power supplies are installed at the rear of the chassis in slots labeled 1 and 0. Both power supplies are
accessible from the rear of the chassis.
WARNING:
location. It has a separate protective earthing terminal provided on the chassis in
addition to the grounding pin of the power supply cord. This separate protective
earthing terminal must be permanently connected to earth ground. See
Ground to an EX Series Switch" on page
Each DC power supply weighs approximately 3 lb (1.3 kg) and has a pair of DC input lugs (–48 VDC and
RTN) on the front of the power supply. Each DC power supply also has a fan, a bicolor LED on the faceplate
that indicates the status of the power supply, and a colored ejector lever. See
Figure 24: DC Power Supply
DC terminal block
Ejector
lever
Power Power
supply supply
LED handle
NOTE: A 1200 W DC power supply requires a dedicated 30 A circuit breaker for the input DC
feed.
The switch is pluggable type A equipment installed in a restricted-access
121.
Figure 24 on page
"Connect Earth
66.
66