Connect Power to a DC Router with Normal-Capacity Power Supplies
WARNING: The router must be properly grounded before you connect the
DC power cables.
Table 2: MX240 DC Power System Input Voltage
SpecificationItem
Operating range: –40.5 to –72 VDCDC input voltage
CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled (+) and (–) to indicate
their polarity. There is no standard color coding for DC power cables. The
color coding used by the external DC power source at your site determines
the color coding for the leads on the power cables that attach to the terminal
studs on each power supply.
1. 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.
2. 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 MX240 3D Universal Edge Router Hardware Guide.
3. Switch the circuit breaker on the power supply faceplate to the OFF position (O).
4. Remove the clear plastic cover protecting the terminal studs on the faceplate.
5. Secure the power cable lugs to the terminal studs on the power supply, first with the
split washer, then with the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm)
of torque. Do not overtighten the nut. (Use a 7/16-in. [11 mm] torque-controlled driver
or socket wrench.)
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.
19Copyright © 2015, Juniper Networks, Inc.
Connect Power to a DC Router with Normal-Capacity Power Supplies
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