Juniper T640 Hardware Manual page 262

T640 Core Router Hardware Guide
228
To connect DC source power cables to the router, follow this procedure for each DC
power supply:
Verify that a properly rated customer site circuit breaker for each DC power cable has
1.
been installed. See the DC power electrical safety guidelines for your router for more
information.
Switch off the customer site circuit breakers. Ensure that the voltage across the DC
2.
power source cable leads is 0 V and that there is no chance that the cable leads might
become active during installation.
Verify that a licensed electrician has attached appropriate cable lugs to the DC power
3.
cables. See the DC power cable and lug specifications for your router for more
information.
Switch the power switch on the power supply faceplate to the standby position.
4.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
5.
Remove the nut and washer from each power terminal stud to be connected. If no
6.
washers and nuts are already installed, they should be in the accessory box.
Remove the captive screws on all three cable restraints on the right edge of the power
7.
supply faceplate (using a Phillips (+) screwdriver, number 2).
Route the negative (–) DC source power cables for
8.
INPUT 4 over the smallest cable restraint on the far right. The cable restraint is marked
as follows top to bottom:
NOTE: You must route the cables in the locations as marked to be able
to replace the clear plastic cover over the terminal studs.
Attach the negative (–) DC source power cable lugs
to the –48 V (input) terminals on the right. Secure the cable lugs to the
INPUT 4
terminal studs, first with the washers, then with the nuts. Using a 7/16-in. (11 mm) nut
driver, tighten the nuts. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of
torque to each nut.
INPUT 0
, ,
INPUT 0 INPUT 1 INPUT 3
, , , and
INPUT 1 INPUT 3
, and .
INPUT 4
INPUT 0 , INPUT 1 , INPUT 3
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