Juniper TX MATRIX PLUS, Hardware Manual

Page: 417 / 502

7.
Remove the cable restraint. Use a Phillips screwdriver.
8.
Remove the nut and washer from the positive (+) DC power
RTN
(return) terminal
on the upper row. Use a 7/16-in. (11 mm) nut driver (see Figure 77 on page 170). Remove
the cable lug from the terminal stud.
9.
Remove the power lug separator over the terminal studs on the lower row of the input
power tray.
10.
Remove the nut and washer from the negative (–) DC power
–48V
(input) terminals
on the lower row of the input power tray. Use a 7/16-in. (11 mm) nut driver (see Figure
77 on page 170). Remove the cable lug from the terminal stud.
11.
Carefully move the power cables out of the way.
Installing a DC Power Supply Cable
1.
Locate a replacement power cable that meets the required specifications.
CAUTION: A licensed electrician must attach a cable lug to the power
cable that you supply. A cable with an incorrectly attached lug can damage
the TX Matrix Plus router.
2.
Slide the replacement power cable lug onto the terminal stud.
3.
Secure the negative (–) DC source power cable lug to the –48V (input) terminal on
the lower row (see Figure 77 on page 170).
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).
CAUTION: All inputs on the DC power supply in slot PEM0 must be
powered by dedicated power feeds derived from feed A, and all inputs on
the 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.
383 Copyright © 2010, Juniper Networks, Inc.
Chapter 22: Replacing TX Matrix Plus Hardware Components