Juniper MX480, Руководство по оборудованию

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5.
Attach the power cord to the AC power source, and switch on the dedicated customer
site circuit breaker for the power supply. Follow the ESD and connection instructions
for your site.
6.
Switch the AC input switch on the each power supply to the on (
—
) position and
observe the status LEDs on the power supply faceplate. If the power supply is correctly
installed and functioning normally, the
AC OK and DC OK LEDs light steadily, and the
PS FAIL LED is not lit.
See Also Replacing an MX480 AC Power Supply on page 318
•
•
AC Electrical Specifications for the MX480 Router on page 47
Connecting an MX480 DC Power Supply Cable
WARNING: Before performing DC power procedures, ensure that power is
removed from the DC circuit. To ensure that all power is off, locate the circuit
breaker on the panel board that services the DC circuit, switch the circuit
breaker to the off position, and tape the switch handle of the circuit breaker
in the off position.
To connect a power cable for a DC power supply:
1.
Locate a replacement power cable that meets the specifications defined in “DC Power
Cable Specifications for the MX480 Router” on page 58 .
2.
Verify that a licensed electrician has attached a cable lug to the replacement power
cable.
3.
Verify that the
INPUT OK
LED is off.
4.
Secure the power cable lug to the terminal studs, first with the flat washer, then with
the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each
nut (see
Figure 73 on page 214 ). Do not overtighten the nut. (Use a 7/16-in. [11 mm]
torque-controlled driver or socket wrench.)
CAUTION: Ensure that each power cable lug seats flush against the surface
of 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 improperly threaded may
result in damage to the terminal stud.
213 Copyright © 2019, Juniper Networks, Inc.
Chapter 3: Initial Installation and Configuration