Dc Power Supply Airflow - Juniper QFX5110 Series Hardware Documentation

Table 64 on page 186 lists the details of the 550 W DC power supplies used in EX4300 switches.
Table 64: Details of the DC Power Supplies in EX4300 Switches
Details
Model number
Field-replaceable unit (FRU) type
Power supply weight
Minimum installed in chassis
Maximum installed in chassis
Power supply slots
Fans
Airflow
Power supply status LEDs
DC input current rating
Operating range
To prevent electrical injury while installing or removing DC power supplies, carefully follow instructions
in "Installing a DC Power Supply in an EX4300 Switch" on page 467
an EX4300 Switch.

DC Power Supply Airflow

Each power supply has its own fan and is cooled by its own internal cooling system.
Each power supply has a label AIR OUT (AFO) or AIR IN (AFI) on the faceplate of the power supply that
indicates the direction of airflow in the power supply.
550 W DC Power Supply
JPSU-550-DC-AFO-A
JPSU-550-DC-AFI-A
Hot-insertable and hot-removable
2.43 lb (1.1 kg)
1
2
Install in power supply slots labeled PSU 0 and PSU 1 in the rear panel
of the chassis.
Internal
Front-to-back, indicated by label AIR OUT (AFO)
Back-to-front, indicated by label AIR IN (AFI)
IN OK and OUT OK
4 A
–38 through –60 VDC
NOTE: The minimum input power required to power on the switch
is –43.5 +/– 0.5 VDC. After the switch is powered on, the operating
range is –38 through –60 VDC.
and Removing an AC Power Supply from
186