Connect Power To A Dc Power Distribution Module - Juniper MX2020 Quick Start Manual

MX2020 3D Universal Edge Router Quick Start

Connect Power to a DC Power Distribution Module

58
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
1.
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 (
Ensure that the voltage across the DC power source cable leads is 0 V and that there
2.
is no chance that the cable leads might become active during installation.
Remove the DC PDM from the electrostatic bag.
3.
Using both hands, slide the PDM part way into the chassis.
4.
Open the two locking levers on either side of the PDM, and align them with the openings
5.
in the chassis.
Using both hands, push firmly on both spring-loaded levers until the PDM is fully seated
6.
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, (
to all inputs of this PDM, and that selecting 60 A reduces the available
power output capacity of the PSMs supplied by this PDM.
Loosen the captive screws on the clear plastic cable restraint protecting the terminal
7.
studs on the faceplate of the PDM.
Secure each power cable lug to the terminal studs, first with the flat washer, then the
8.
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
(Use a 7/16-in. [11 mm] torque-controlled driver or socket wrench).
Table 10 on page 58 describes the DC operating range specifications.
Attach the positive (+) DC source power cable lug to the
a.
Attach the negative (–) DC source power cable lug to the
b.
Table 10: MX2020 DC Power System Input Voltage
Item
DC input voltage
) position.
O
60 A
Figure 40 on page
Specification
Operating range: –40 to –72 VDC
) or ( 80 A ). This switch applies
59). Do not overtighten the nut.
RTN (return) terminal.
(input) terminal.
–48V
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