Figure 16: Setting the Input Switches for Redundant Power
2—
1—
Input
2
switch
ON
Input
1
switch
ON
8.
Use a number 1 Phillips (+) screwdriver to loosen the screws on the input terminal
cover, and remove the input terminal cover.
9.
Remove the nuts from the DC power terminal studs.
10.
Connect the positive (+) DC source power cables to input
1
and input
2 RTN
(return)
input terminals (
and
).
CAUTION:
One input on each DC PSM must be powered by dedicated
power feeds derived from feed A, and the other input on each PSM must
be powered by dedicated power feeds derived from feed B.
This configuration provides the commonly deployed A/B feed redundancy
for the system. For example, you can connect input
1
on each DC PSM to
feed A, and input
2
on each DC PSM to feed B.
CAUTION:
You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled
(+)
and
(–)
to indicate
their polarity. There is no standard color coding for DC power cables. The
color coding used by the external DC power source at your site determines
the color coding for the leads on the power cables that attach to the
terminal studs on each power supply.
Secure the positive (+) DC source power cable lugs to the
RTN
(return) terminals with
a nut for each terminal. Use a 7/16-in. (11 mm) nut driver to tighten the nuts.
CAUTION:
You must use an appropriate torque-controlled tool to tighten
the nuts. Applying excessive torque damages the terminal studs and power
supply. The maximum torque that may be applied to this nut is 24.0 lb-in.
( 2.7 Nm).
21
Copyright © 2014, Juniper Networks, Inc.
Connect Redundant DC Power to the PTX3000 DC Power Supply Modules