Connect Power To A Dc Router - Juniper MX5 Quick Start Manual

MX5, MX10, MX40, and MX80 3D Universal Edge Router Quick Start

Connect Power to a DC Router

14
Table 1: MX5, MX10, MX40, and MX80 DC Power System Input Voltage
Item
DC input voltage
Switch off the dedicated customer site circuit breakers. Ensure that the voltage across
1.
the DC power source cable leads is 0 V and that there is no chance that the cable
leads might become active during installation.
Switch the DC circuit breaker on the power supply faceplate to the off (
2.
Remove the clear plastic cover protecting the terminal on the faceplate.
3.
Verify that the DC power cables are correctly labeled before making connections to
4.
the power supply. In a typical power distribution scheme where the return is connected
to chassis ground at the battery plant, you can use a multimeter to verify the resistance
of the and DC cables to chassis ground:
–48V RTN
The cable with very large resistance (indicating an open circuit) to chassis ground
is .
–48V
The cable with very low resistance (indicating a closed circuit) to chassis ground is
.
RTN
Remove the screws from the terminals.
5.
Secure each power cable lug to the terminal with the screw (see
6.
Apply between 5 lb-in. (0.6 Nm) and 6 lb-in. (0.7 Nm) of torque to screw. Do not
overtighten the nut. (Use a number 2 Phillips screwdriver.)
a. Secure the positive (+) DC source power cable lug to the
b. Secure the negative (–) DC source power cable lug to the
CAUTION: Ensure that each power cable lug seats flush against the surface
of the terminal block as you are tightening the screws. Ensure that each
screw is properly threaded into the terminal. Applying installation torque
to the screw when improperly threaded may result in damage to the
terminal.
CAUTION: The maximum torque rating of the terminal screws on the DC
power supply is 6 lb-in. (0.7 Nm). The terminal screws may be damaged
if excessive torque is applied. Use only a torque-controlled driver to tighten
screws on the DC power supply terminals. Use an appropriately-sized
driver, with a maximum torque capacity of 6 lb-in. or less. Ensure that the
driver is undamaged and properly calibrated and that you have been
Specification
Operating range: –40 to –72 VDC
Copyright © 2015, Juniper Networks, Inc.
) position.
O
Figure 10 on page 15).
(return) terminal.
RTN
(input) terminal.
–48V