Connect Power To A Dc Router With Normal-Capacity Power Supplies - Juniper MX240 Quick Start Manual

Connect Power to a DC Router with Normal-Capacity Power Supplies

Copyright © 2015, Juniper Networks, Inc.
WARNING: The router must be properly grounded before you connect the
DC power cables.
Table 2: MX240 DC Power System Input Voltage
Item
DC input voltage
CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled
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.
Ensure that the voltage across the DC power source cable leads is 0 V and that there
1.
is no chance that the cable leads might become active during installation.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
2.
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.
Switch the circuit breaker on the power supply faceplate to the
3.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
4.
Secure the power cable lugs to the terminal studs on the power supply, first with the
5.
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.)
Attach the positive (+) DC source power cable lug to the
a.
Attach the negative (–) DC source power cable lug to the
b.
Connect Power to a DC Router with Normal-Capacity Power Supplies
Specification
Operating range: –40.5 to –72 VDC
and to indicate
(+) (–)
position ( ).
OFF O
(return) terminal.
RTN
(input) terminal.
–48V
19