To install a DC power supply (see Figure 56 on page 176):
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 ESD grounding strap to your bare wrist and connect the strap to one of the
ESD points on the chassis.
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. Remove the clear plastic cover protecting the terminal on the faceplate.
5. Ground the DC power supply (see Figure 55 on page 174):
•
Remove the nut and washer from the grounding point on the power supply.
•
Secure each grounding cable lug to the grounding point with the washer and nut.
Figure 55: Connecting a DC Power Supply Grounding Cable
6. Remove the screws and washers from the DC terminals.
7. Verify that the DC power cables are correctly labeled before making connections to
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 DC cables to chassis ground:
For –48V and –60V:
a. The cable with very high resistance (indicating an open circuit) to chassis ground
is the DC input cable (–).
Copyright © 2017, Juniper Networks, Inc.174
MX104 3D Universal Edge Router Hardware Guide
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