Connecting An Mx240 Dc Power Supply Cable - Juniper MX240 Hardware Manual

Copyright © 2019, Juniper Networks, Inc.
Verify that the
3. INPUT OK
Remove the power cable from the external DC power source.
4.
Attach an ESD grounding strap to your bare wrist and connect the strap to one of the
5.
ESD points on the chassis.
Switch the DC circuit breaker on the DC power supply faceplate to the off (
6.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
7.
Remove the nut and washer from each of the terminal studs. (Use a 7/16-in. [11 mm]
8.
nut driver or socket wrench.)
Remove the cable lug from the terminal studs.
9.
Carefully move the power cable out of the way.
10.

Connecting an MX240 DC Power Supply Cable

WARNING: Before performing DC power procedures, ensure that power is
removed from the DC circuit. To ensure that all power is off, locate the circuit
breaker on the panel board that services the DC circuit, switch the circuit
breaker to the off position, and tape the switch handle of the circuit breaker
in the off position.
To connect a power cable for a DC power supply:
Locate a replacement power cable that meets the specifications.
1.
Verify that a licensed electrician has attached a cable lug to the replacement power
2.
cable.
Verify that the
INPUT OK
3.
Secure the power cable lug to the terminal studs, first with the flat washer, then with
4.
the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each
nut (see Figure 72 on page
torque-controlled driver or socket wrench.)
CAUTION: Ensure that each power cable lug seats flush against the surface
of the terminal block as you are tightening the nuts. Ensure that each nut
is properly threaded onto the terminal stud. The nut should be able to spin
Chapter 4: Maintaining, Installing and Replacing Components
LED on the power supply is not lit.
LED is off.
205). Do not overtighten the nut. (Use a 7/16-in. [11 mm]
O ) position.
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