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to tighten the nut (see Figure 122 on page 274). Apply between 23 lb-in. (2.6 Nm) and
25 lb-in. (2.8 Nm) of torque to each nut:
a.
Secure each positive (+) DC source power cable lug to a
RTN
(return) terminal.
b.
Secure each negative (–) DC source power cable lug to a
–48V
(input) terminal.
NOTE:
All inputs on the two-input 160-A DC power supply in slot
PEM0
must be powered by dedicated power feeds derived from feed A, and all
inputs on the two-input 160-A DC power supply in slot
PEM1
must be
powered by dedicated power feeds derived from feed B. This configuration
provides the commonly deployed A/B feed redundancy for the system.
NOTE:
INPUT 0
and
INPUT 1
on the three-input 240-A DC power supply
in slot
PEM0
must be powered by dedicated power feeds derived from
feed A, and
INPUT 0
and
INPUT 1
on the three-input 240-A DC power supply
in slot
PEM1
must be powered by dedicated power feeds derived from feed
B. This configuration provides the commonly deployed A/B feed
redundancy for the system.
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.
10.
Loosen the captive screws on the cable restraints on the right edge of the power
supply faceplate.
11.
Route the positive and negative DC power cables through the top and bottom of each
cable restraint.
12.
Tighten the cable restraint captive screws to hold the power cables in place.
13.
Verify that the power cabling is correct, that the cables are not touching or blocking
access to router components, and that they do not drape where people could trip on
them.
14.
Replace the clear plastic cover over the terminal studs on the faceplate.
15.
Switch the circuit breakers on the power supply to the on position (
|
).
273
Copyright © 2010, Juniper Networks, Inc.
Chapter 24: Replacing TX Matrix Hardware Components
Содержание TX MATRIX
Страница 1: ...TX Matrix Router Hardware Guide Published 2010 10 18 Copyright 2010 Juniper Networks Inc ...
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Страница 389: ...PART 6 Index Index on page 359 357 Copyright 2010 Juniper Networks Inc ...
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