Table of Contents
Advertisement
Upgrading MX240, MX480, and MX960 3D Universal Edge Router Power Supplies and Fan Trays
Installing the MX240 and MX480 DC High-Capacity Power Supplies
NOTE: During the upgrade process, you can simultaneously run existing and
high-capacity power supplies. However, it is recommended to upgrade all power
supplies to high-capacity power supplies.
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 install a DC power supply (see Figure 16 on page 20):
1.
2.
3.
4.
5.
6.
7.
8.
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.
18
Installing the MX240 and MX480 DC High-Capacity Power Supplies
Ensure that the voltage across the DC power source cable leads is 0 V and that
there is no chance that the cable leads might become active during installation.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and
connect the strap to one of the ESD points on the chassis.
Move the DC circuit breaker on the power supply faceplate to the off (
Using both hands, slide the power supply straight into the chassis until the power
supply is fully seated in the chassis slot. The power supply faceplate should be
flush with any adjacent power supply faceplate or blank installed in the power
supply slot.
Tighten the captive screws on the lower edge of the power supply faceplate.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
Remove the nut and washer from each of the terminal studs.
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 Figure 17 on page 21). Apply
between 23 lb-in. (2.6 Nm) and 25 lb-in. (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 the positive (+) DC source power cable lug to the
terminal.
b. Secure the negative ( ) DC source power cable lug to the
terminal.
) position.
O
(return)
RTN
(input)
48V
Advertisement
Table of Contents
