Juniper MX240 Hardware Manual page 145

CAUTION: You must ensure that power connections maintain the proper polarity.
The power source cables might be labeled
is no standard color coding for DC power cables. The color coding used by the external
DC power source at your site determines the color coding for the leads on the power
cables that attach to the terminal studs on each power supply.
NOTE: For the MX240 router, the DC power supply in
dedicated power feeds derived from feed
be powered by dedicated power feeds derived from feed
provides the commonly deployed
NOTE: For information about connecting to DC power sources, see "DC Power
System Electrical Specifications" on page 167.
Replace the clear plastic cover over the terminal studs on the faceplate.
9.
Verify that the power cabling is correct, that the cables are not touching or
10.
blocking access to router components, and that they do not drape where people
could trip on them.
11. Verify that the INPUT OK
Switch the circuit breaker on the power supply to the
12.
the status LEDs on the power supply faceplate. If the power supply is correctly
installed and functioning normally, the
light green steadily.
NOTE: If more than one power supply is being installed, turn on all power supplies
at the same time.
NOTE: An SCB must be present for the
Chapter 13: Replacing Hardware Components
(+) and ( ) to indicate their polarity. There
, and the DC power supply in
A
feed redundancy for the system.
A/B
LED on the power supply is lit green.
PWR OK , BRKR ON
LED to go on.
PWR OK
Replacing Power System Components
PEM0 must be powered by
must
PEM2
B . This configuration
position and observe
ON —
, and INPUT OK LEDs
117