Connecting The Router To Power - Juniper ACX2200 Hardware Manual

Copyright © 2017, Juniper Networks, Inc.
Verify that the DC power cables are correctly labeled before making connections to
3.
the power supply. In a typical power distribution scheme where the return is connected
to chassis ground at the battery plant, you can use a multimeter to verify the resistance
of the –48V and return DC cables to chassis ground:
For –48V and –60V:
a. The cable with very large resistance (indicating an open circuit) to chassis ground
is the DC input cable (
b. The cable with very low resistance (indicating a closed circuit) to chassis ground
is the return cable (
+
For +24V:
a. The cable with very low resistance (indicating a closed circuit) to chassis ground
is the DC input cable (
b. The cable with very large resistance (indicating an open circuit) to chassis ground
is the return cable (
+
Remove the screws and flat washers from the terminals.
4.
Secure each power cable lug to the terminal with the flat washers and screw (see
5.
Figure 19 on page 78). Apply between 8 lb-in. (0.9 Nm) and 9 lb-in. (1.02 Nm) of torque
to each screw. Do not overtighten the screw. (Use a number 2 Phillips screwdriver.)
a. Secure the positive DC source power cable lug to the return (
b. Secure the negative DC source power cable lug to the input (
CAUTION: Ensure that each power cable lug seats flush against the surface
of the terminal block as you are tightening the screws. Ensure that each
screw is properly threaded into the terminal. Applying installation torque
to the screw when improperly threaded may result in damage to the
terminal.
CAUTION: The maximum torque rating of the terminal screws on the DC
power supply is 9 lb-in. (1.02 Nm). The terminal screws may be damaged
if excessive torque is applied. Use only a torque-controlled driver to tighten
screws on the DC power supply terminals. Use an appropriately sized
driver, with a maximum torque capacity of 9 lb-in. or less. Ensure that the
driver is undamaged and properly calibrated and that you have been
trained in its use. You may wish to use a driver that is designed to prevent
overtorque when the preset torque level is achieved.
Replace the clear plastic cover over the terminals on the faceplate.
6.
Chapter 17: Connecting the Router to Power
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