Juniper EX9214 Hardware Manual page 176

EX9214 Switch Hardware Guide
152
is properly threaded onto the terminal stud. You must be able to spin the
nuts freely with your fingers when they are placed onto the terminal stud
for the first time. Applying installation torque to the nuts when they are
improperly threaded can damage the terminal stud.
CAUTION: The maximum torque rating for the terminal studs on the DC
power supply is 36 lb-in. (4.0 Nm) Excessive torque can damage the
terminal studs. Use only a torque-controlled driver or socket wrench to
tighten the nuts on the DC power supply terminals.)
Route the power cables along the cable restraint toward the left or right corner of the
9.
chassis. If needed, thread plastic cable ties, which you must provide, through the
openings on the cable restraint to hold the power cables in place.
Replace the clear plastic cover over the terminal studs on the faceplate.
10.
Verify that the power cabling is correct, that the cables are not touching or blocking
11.
access to switch components, and that they do not drape where people could trip on
them.
Switch on the dedicated customer site circuit breakers. Follow your site's procedures
12.
for safety and to prevent ESD damage (see
Damage" on page 305).
NOTE: The DC power supplies in slots
by dedicated power feeds derived from feed A and the DC power supplies
in slots
PEM2
derived from feed B. This configuration provides the commonly deployed
A/B feed redundancy for the system. For information about connecting
to DC power sources, see
Switches" on page
Verify that the
INP0 OK
13.
you are using two feeds, verify that both
supply are lit steadily in green. The
the voltage at the input is in reverse polarity. Check the polarity of the power cables
to fix the condition.
On each of the DC power supplies, switch the DC circuit breaker to the center position
14.
before moving it to the On (
NOTE: The circuit breaker might bounce back to the Off (
you move the breaker too quickly.
Observe the status LEDs on the power supply faceplate. If the power supply is installed
correctly and is functioning normally, the
"Prevention of Electrostatic Discharge
and must be powered by dedicated power feeds
PEM3
"DC Power Supply Specifications for EX9214
81.
or LED on the power supply are lit green steadily. If
INP1 OK
INP0 OK and
and
INP0 OK INP1 OK
| ) position.
DC OK LEDs is lit steadily in green.
PEM0 and PEM1 must be powered
INP1 OK LEDs on the power
LEDs are lit in amber color if
) position if
O
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