Juniper Networks MX240 Disconnecting a DC Power Supply Cable, Connecting a DC Power Supply Cable

MX240 Ethernet Services Router Hardware Guide

Disconnecting a DC Power Supply Cable

To disconnect a power cable for a DC power supply:

1.Switch the dedicated facility circuit breaker to the off position. Make sure that the voltage across the DC power source cable leads is 0 V and that there is no chance that the cables might become active during the removal process.

2.Remove the power cable from the external DC power source.

3.Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis. For more information about ESD, see “Preventing Electrostatic Discharge Damage” on page 130.

4.Switch the circuit breaker on the power supply faceplate to the OFF position O.

5.Remove the clear plastic cover protecting the terminal studs on the faceplate.

6.Remove the nut and washer from the terminal studs. (Use a 3/8–in. nut driver or socket wrench.)

7.Remove the cable lug from the terminal studs.

8.Loosen the captive screws on the bottom edge of the power supply faceplate.

9.Carefully move the power cable out of the way.

Connecting a DC Power Supply Cable

To connect a power cable for a DC power supply (see Figure 58 on page 121):

1.Locate a replacement power cable that meets the specifications defined in Table 32 on page 171.

2.Verify that a licensed electrician has attached a cable lug to the replacement power cable.

3.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 58 on page 121).

120■ Replacing Power System Components