Juniper MX240 Hardware Manual page 148

MX240 Ethernet Services Router Hardware Guide
Disconnecting a DC Power Supply Cable
To disconnect a power cable for a DC power supply:
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Connecting a DC Power Supply Cable
To connect a power cable for a DC power supply (see Figure 58 on page 121):
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120
Replacing Power System Components
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.
Remove the power cable from the external DC power source.
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.
Switch the circuit breaker on the power supply faceplate to the
Remove the clear plastic cover protecting the terminal studs on the faceplate.
Remove the nut and washer from the terminal studs. (Use a 3/8–in. nut driver
or socket wrench.)
Remove the cable lug from the terminal studs.
Loosen the captive screws on the bottom edge of the power supply faceplate.
Carefully move the power cable out of the way.
Locate a replacement power cable that meets the specifications defined in
Table 32 on page 171.
Verify that a licensed electrician has attached a cable lug to the replacement
power cable.
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).
position .
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