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Connect Power to a DC Power Distribution Module

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

the strap to one of the ESD points on the chassis. For more information about ESD,

see the MX2020 3D Universal Edge Router Hardware Guide.

NOTE: If the DC PSMs are installed in the router, make sure that the power

switch is turned to the off (O) position.

2. Ensure that the voltage across the DC power source cable leads is 0 V and that there

is no chance that the cable leads might become active during installation.

3. Remove the DC PDM from the electrostatic bag.

4. Using both hands, slide the PDM part way into the chassis.

5. Open the two locking levers on either side of the PDM, and align them with the openings

in the chassis.

6. Using both hands, push firmly on both spring-loaded levers until the PDM is fully seated

in the chassis slot. The PDM faceplate should be flush. Tighten both captive screws.

NOTE: Make sure that the DC circuit feed switch on the PDM faceplate

matches the current rating amperage, (60 A) or (80 A). This switch applies

to all inputs of this PDM, and that selecting 60 A reduces the available

power output capacity of the PSMs supplied by this PDM.

7. Loosen the captive screws on the clear plastic cable restraint protecting the terminal

studs on the faceplate of the PDM.

8. Secure each power cable lug to the terminal studs, first with the flat washer, then the

split washer, and finally with the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in.

(2.8 Nm) torque to each nut (see Figure 40 on page 59). Do not overtighten the nut.

(Use a 7/16-in. [11 mm] torque-controlled driver or socket wrench).

Table 10 on page 58 describes the DC operating range specifications.

a. Attach the positive (+) DC source power cable lug to the RTN (return) terminal.

b. Attach the negative (–) DC source power cable lug to the –48V (input) terminal.

Table 10: MX2020 DC Power System Input Voltage

SpecificationItem

Operating range: –40 to –72 VDCDC input voltage

MX2020 3D Universal Edge Router Quick Start

Juniper MX2020 User Manual

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