7.
Connect power to the appliance.
For a standard, DC-power-equipped appliance:
CAUTION:
You must ensure that power connections maintain the proper polarity.
Verify that the DC power cables are correctly labeled before making connections to the
power supply. In a typical power distribution scheme where the return is connected to
chassis ground at the battery plant, you can use a multimeter to verify the resistance
of the
V- (–48V)
and
V+ (RTN)
DC cables to chassis ground:
•
The cable with very large resistance (indicating an open circuit) to chassis ground is
V- (–48V)
.
•
The cable with very low resistance (indicating a closed circuit) to chassis ground is
V+ (RTN)
.
a.
Switch off the dedicated customer site circuit breakers for the power supplies.
b.
Ensure that the equipment rack is properly grounded to a permanent earth
ground and the appliance has a good low-resistance ground bond to the rack.
c.
Remove the protective cover from the DC terminals on the power supplies.
d.
Loosen the DC terminal screws.
e.
Insert the positive (+) DC source power cable and tighten the screw to secure
the cable to the
V+ (RTN)
return terminal.
f.
Insert the negative (–) DC source power cable and tighten the screw to secure
the cable to the
V- (–48V)
input terminal.
g.
Replace the protective cover over the DC terminals on the power supplies.
h.
Remove the screw from the grounding terminal on the power supply.
i.
Insert the screw through the grounding lug on the cable and tighten the screw
to secure the grounding cable to the power supply grounding terminal.
j.
Switch on the dedicated customer site circuit breakers for the power supplies.
See the
VXA2000 Series Media Flow Engine Hardware Installation Guide
for
detailed information on connecting DC power to the appliance.
For an appliance equipped with optional AC power supplies:
a.
Ensure that the equipment rack is properly grounded to a permanent earth
ground and the appliance has a good low-resistance ground bond to the rack.
An AC-powered appliance gets additional grounding when you connect the
power supply in the appliance to a grounded AC power outlet with the correct
AC power cord.
b.
Insert an AC power cord appropriate for your geographical area (supplied) into
the power inlet on each power supply.
5
Copyright © 2010, Juniper Networks, Inc.
2. Installing the Media Flow Engine
