Juniper Networks MX480 - Manual (Page 135)

Installing an MX480 DC High-Capacity Power Supply
To install a DC 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. Move the power switch on the power supply faceplate to the off ( O ) position.
3. Using both hands, slide the power supply straight into the chassis until the power
supply is fully seated in the chassis slot. The power supply faceplate should be flush
with any adjacent power supply faceplate or blank installed in the power supply slot.
4. Using a screwdriver, loosen the captive screw holding the metal cover over the input
mode switch. Rotate the metal cover away from the input mode switch to expose the
switch.
5. Check the setting of the input mode switch. Use a sharp, nonconductive object to
slide the switch to the desired position. Set the input mode switch to position 0 for
60-A input and position 1 for 70-A input. This setting is used by the power management
software and needs to be set before on the power supply. See
Figure 69 on page 111 .
Figure 69: DC High-Capacity Power Supply Input Mode Switch
g004725
6. Rotate the metal cover over the input mode switch, and use a screwdriver to tighten
the captive screw.
7. Tighten the captive screws on the lower edge of the power supply faceplate.
8. Remove the clear plastic cover protecting the terminal studs on the faceplate.
9. Remove the nut and washer from each of the terminal studs.
10. Secure each power cable lug to the terminal studs, first with the flat washer, then
with the split washer, and then with the nut (see
Figure 70 on page 113 ). Apply between
23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut. Do not overtighten the
nut. (Use a 7/16-in. [11 mm] torque-controlled driver or socket wrench.)
a. Secure the positive (+) DC source power cable lug to the RTN (return) terminal.
b. Secure the negative (–) DC source power cable lug to the –48V (input) terminal.
111 Copyright © 2013, Juniper Networks, Inc.
Chapter 10: Grounding and Providing Power to the MX480 Router