Replacing An M10I Dc Power Cable; Removing A Dc Power Cable; Installing A Dc Power Cable - Juniper M10i Hardware Manual

Replacing an M10i DC Power Cable

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A DC-powered router has up to four load-sharing DC power supplies. The router must
have at least two DC power supplies, and any two DC power supplies can provide full
power to the router. The power cords on a redundant power supply are hot-removable
and hot-insertable, as described in "M10i Field-Replaceable Units (FRUs)" on page 99.
For M10i routers with only two DC power supplies, you must power off the router before
replacing the DC power cables. See "Powering Off an M10i Router" on page 71.
Removing a DC Power Cable on page 129
1.
Installing a DC Power Cable on page 129
2.

Removing a DC Power Cable

To remove a DC power cable:
For each power supply, press the power switch on the power supply faceplate to the
1.
( ) position.
OFF O
NOTE: If you are power cycling the power supply rather than shutting it
off for a time, wait at least 60 seconds after turning it off before turning
it back on. If you need to power it off again, wait for at least 60 seconds
after powering it on.
Shut off the power flowing from both external power sources, so that the voltage
2.
across the leads of the DC power cables is 0 V. Ensure that there is no chance that
the cable leads might become active during the procedure.
Using a number 1 Phillips screwdriver, turn the screw on each field-wiring terminal
3.
counter-clockwise to loosen the terminal connector from around the cable lug.
Remove the cables from the terminal connectors and from the hook located on the
4.
faceplate to the right of the field-wiring terminals.
Verify that the removed cables are not touching or blocking access to any router
5.
components.

Installing a DC Power Cable

Connect DC power to the router by inserting DC power cables into the field-wiring
terminals on the faceplate of each power supply. For information about the required
cable type, see "M10i DC Power Cable and Lug Specifications" on page 192.
Verify that there is no power flowing from the external power source, so that the
1.
voltage across the leads of the power cables is 0 V. Ensure that there is no chance
that the cable leads might become active during the procedure.
Verify that a licensed electrician has attached a listed DC power cable lug to the DC
2.
power cable.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
3.
the strap to one of the ESD points on the chassis.
Chapter 15: Replacing M10i Hardware Components
129