Juniper MX240 - UPGRADING Manual page 32

Upgrading MX240, MX480, and MX960 3D Universal Edge Router Power Supplies and Fan Trays
32
CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled
their polarity. There 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: The DC power supplies in slots
by dedicated power feeds derived from feed
in and
PEM2
from feed B . This configuration provides the commonly deployed
redundancy for the system. For information about connecting to DC power
sources, see DC Power Supply Electrical Specifications for the MX960
Router.
Loosen the captive screw on the cable restraint on the lower edge of the power supply
11.
faceplate.
Route the positive and negative DC power cables through the left and right sides of
12.
the cable restraint.
Tighten the cable restraint captive screw to hold the power cables in place.
13.
Replace the clear plastic cover over the terminal studs on the faceplate.
14.
Verify that the power cabling is correct, that the cables are not touching, and that they
15.
do not block access to router components or drape where people could trip on them.
Switch on the dedicated customer site circuit breaker.
16.
Verify that the INPUT OK
17.
On each of the DC power supplies, move the switch to the on (
18.
NOTE: The switch may bounce back to the off (
the breaker too quickly.
Verify that the LED is lit steadily.
19. DC OK
must be powered by dedicated power feeds derived
PEM3
LED on the power supply is lit steadily.
and to indicate
(+) (–)
PEM0 and PEM1 must be powered
, and the DC power supplies
A
) position.
|
O ) position if you move
Copyright © 2010, Juniper Networks, Inc.
A/B feed