Connecting DC Power to the PTX5000 Packet Transport Switch
The input power tray weighs 1.6 lb (0.7 kg).
To connect the DC source power cables to the 120-A DC inputs:
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.
3. Switch the circuit breakers on the power distribution unit (PDU) faceplate to the OFF
position (O).
4. Loosen the captive screw that fastens the input power tray to the PDU .
5. Grasp the metal handle of the input power tray, and pull it out to remove the input
power tray from the PDU.
Figure 43: Removing the Input Power Tray
6. Use a Phillips screwdriver to loosen the screw on the metal input power tray cover.
7. Open the metal input power tray cover.
8. Loosen the cable restraints.
9. Remove the nuts from the DC power terminal studs.
10. Route the positive (+) DC source power cable lug through the left cable restraint.
11. Secure the positive (+) DC source power cable lug to the RTN (return) terminal, located
on the left, with a nut.
Use a 7/16-in. (11 mm) nut driver to tighten the nut.
12. Route the negative (–) DC source power cable lug through the right cable restraint.
13. Attach the negative (–) DC source power cable lug to the –48V (input) terminal,
located on the right (see Figure 44 on page 95).
Use a 7/16-in. (11 mm) nut driver to tighten the nut.
CAUTION: You must use an appropriate torque-controlled tool to tighten
the nuts. Applying excessivetorquedamages the terminal studs and power
Copyright © 2012, Juniper Networks, Inc.94
PTX5000 Packet Transport Switch Hardware Guide
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