Juniper PTX5000 Hardware Manual page 285

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. Switch the circuit breakers on the power distribution unit (PDU) faceplate to the off (O) position.
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 (see Figure 130 on page
Figure 130: Removing the 120-A DC 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 10-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 131 on page
Use a 10-mm nut driver to tighten the nut.
267). The 120-A DC input power tray weighs 1.6 lb (0.7 kg).
269).
267