Disconnecting An Mx2020 Dc Power Distribution Module Cable; Connecting An Mx2020 Dc Power Distribution Module Cable - Juniper MX2020 Hardware Manual

Disconnecting an MX2020 DC Power Distribution Module Cable

Connecting an MX2020 DC Power Distribution Module Cable

Copyright © 2015, Juniper Networks, Inc.
WARNING: Before performing DC power procedures, disconnect all power
sources. To ensure that all power is
panel board that services the DC circuit, switch the circuit breaker to the
position, and tape the switch handle of the circuit breaker in the
To disconnect a power cable for a DC PDM:
Switch off the dedicated customer site circuit breaker for the PDM being removed.
1.
Follow your site's procedures for ESD.
Make sure that the voltage across the DC power source cable leads is 0 V and that
2.
there is no chance that the cables might become active during the removal process.
Verify that the LED on the PDM is not lit.
–48V
3.
Remove the power cable from the external DC power source.
4.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
5.
the strap to one of the ESD points on the chassis.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
6.
Remove the nut and washers from each of the terminal studs. (Use a 7/16-in.
7.
[11 mm] nut driver or socket wrench.)
Remove the cable lug from the terminal studs.
8.
Carefully move the power cable out of the way.
9.
Replace the clear plastic cover protecting the terminal studs on the faceplate.
10.
WARNING: Before performing DC power procedures, disconnect all power
sources. To ensure that all power is
panel board that services the DC circuit, switch the circuit breaker to the
position, and tape the switch handle of the circuit breaker in the
To connect a power cable for a DC PDM:
Locate a replacement power cable that meets the specifications defined in
1.
DC Power Subsystem Electrical Specifications" on page
Verify that a licensed electrician has attached a cable lug to the replacement power
2.
cable.
Verify that the LED is off.
3. –48V
Secure the power cable lug to the terminal studs, first with the first with the flat washer,
4.
then the split washer, and then with the nut. Apply between 23 lb-in. (2.6 Nm) and
Chapter 25: Replacing Components
, locate the circuit breaker on the
OFF
, locate the circuit breaker on the
OFF
179.
OFF
OFF position.
OFF
position.
OFF
"MX2020
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