Juniper TX MATRIX PLUS Hardware Manual page 415

Copyright © 2010, Juniper Networks, Inc.
Verify that the circuit breakers on the power supply faceplate are in the
4.
position ( ).
O
Loosen the captive screws on the cable restraint.
5.
Remove the power lug separator that covers the lower row of terminal studs.
6.
Remove the nut and washer from each power terminal stud.
7.
CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled
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 negative (–) DC source power cable lugs to the
8.
first with a washer, then with a nut (see Figure 136 on page 382).
Use a 7/16-in. (11-mm) nut driver or wrench to tighten the nut. Apply between 23 lb-in.
(2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut.
CAUTION: You must use an appropriate torque-controlled tool to tighten
the nuts. Applying excessive torque damages the terminal studs and the
power supply. The maximum torque that may be applied to this nut is 25
in-lb (2.8 Nm).
Replace the power lug separator over the lower row of terminal studs.
9.
Remove the nuts and washers from the power terminal studs on the upper row.
10.
Secure the the positive (+) DC source power cable lugs to the
11.
terminals, first with a washer, then with a nut (see Figure 136 on page 382).
Use a 7/16-in. (11-mm) nut driver or wrench to tighten the nut. Apply between 23 lb-in.
(2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut.
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 25 in-lb
(2.8 Nm).
Route the DC power cables through the cable restraints.
12.
Tighten the cable restraint captive screws to hold the power cables in place. Attach
13.
the cable restraint to the input power tray.
Chapter 22: Replacing TX Matrix Plus Hardware Components
–48V
OFF
(+) and (–) to indicate
(input) terminals,
RETURN (return)
381