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8. 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
(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 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:
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 might result in damage to the
terminal stud.
CAUTION:
25 lb-in. (33.89 Nm). The terminal studs might 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 and PDM1/Input1 can be powered by dedicated
power feeds derived from feed Aor 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 screwdriver to tighten
screws on the DC PDM cable restraint.
Figure 135 on page
331). Apply between 23 lb-in. (2.6 Nm) and 25 lb-in.
Ensure that each power cable lug seats flush against the surface of the
The maximum torque rating of the terminal studs on the DC PDM is
The maximum torque rating of the cable restraint screws on the DC
330
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