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

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Disconnecting an MX2020 DC Power Distribution Module Cable

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 disconnect a power cable for a DC PDM:

1. Switch off the dedicated customer site circuit breaker for the PDM being removed. Follow your site's

procedures for ESD.

2. Make sure that the voltage across the DC power source cable leads is 0 V and that there is no chance

that the cables might become active during the removal process.

3. Verify that the –48V LED on the PDM is not lit.

4. Remove the power cable from the external DC power source.

5. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to

one of the ESD points on the chassis.

6. Remove the clear plastic cover protecting the terminal studs on the faceplate.

7. Remove the nut and washers from each of the terminal studs. (Use a 7/16-in. [11 mm] nut driver or

socket wrench.)

8. Remove the cable lug from the terminal studs.

9. Carefully move the power cable out of the way.

10. Replace the clear plastic cover protecting the terminal studs on the faceplate.

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