Juniper MX2020 Hardware Manual page 339

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 each positive (+) DC source power cable lug to the RTN (return) terminal.
b. Secure each negative (–) DC source power cable lug to the –48V (input) terminal.
CAUTION:
the terminal block as you are tightening the nuts. Ensure that each nut is properly
threaded onto the terminal stud. The nut should be able to spin freely with your
fingers when it is first placed onto the terminal stud. Applying installation torque
to the nut when the nut is improperly threaded may result in damage to the
terminal stud.
CAUTION:
is 25 lb-in. (33.89 Nm). The terminal studs may be damaged if excessive torque
is applied. Use only a torque-controlled driver or socket wrench to tighten nuts
on the DC PDM terminal studs.
NOTE: The DC PDMs in slots PDM0/Input0, PDM2/Input0, PDM1/Input1, and
PDM3/Input1 can be powered by dedicated power feeds derived from feed A, or feed B.
This configuration provides the commonly deployed A/B feed redundancy for the system
to balance the power draw.
9. Close the plastic cable restraint cover over the terminal studs on the faceplate.
10. Route the positive and negative DC power cables through the left and right sides of the cable restraint.
11. Tighten the cable restraint captive screw to hold the power cables in place.
CAUTION:
PDM is 25 lb-in. (33.89 Nm). Use only a torque-controlled screw driver to tighten
screws on the DC PDM cable restraint.
Ensure that each power cable lug seats flush against the surface of
The maximum torque rating of the terminal studs on the DC PDM
The maximum torque rating of the cable restraint screws on the DC
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