Juniper MX480 - Connecting an MX480 DC Power Supply Cable

4. Verify that the power cord does not block the air exhaust and access to router
components, or drape where people could trip on it.
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
observethe status LEDs on the power supply faceplate. If the powersupply is correctly
installed and functioning normally, the AC OK and DC OK LEDs light steadily, and the
PS FAIL LED is not lit.
Related
Documentation
Preventing Electrostatic Discharge Damage to an MX480 Router on page 484•
• Replacing an MX480 AC Power Supply on page 367
• Disconnecting an MX480 AC Power Supply Cord on page 376
• AC Electrical Specifications for the MX480 Router on page 139
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 powercablethat meets the specifications defined in “DC Power
Cable Specifications for the MX480 Router” on page 173.
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 77 on page 228). Do not overtighten the nut. (Use a 7/16-in. [11 mm]
torque-controlled driver or socket wrench.)
CAUTION: Ensure thateach power cablelugseatsflushagainstthe surface
of the terminal block as you are tightening the nuts. Ensure that each nut
227Copyright © 2017, Juniper Networks, Inc.
Chapter 17: Connecting the MX480 Router to Power