Juniper MX240 Hardware Manual page 203

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Copyright © 2019, Juniper Networks, Inc.
Check the voltage with a meter at the terminals of the power supply for correct
voltage level and polarity.
Attach an ESD grounding strap to your bare wrist and connect the strap to one of the
8.
ESD points on the chassis.
On each of the DC power supplies, switch the DC circuit breaker to the center position
9.
before moving it to the on (
NOTE: The circuit breaker may bounce back to the off (
move the breaker too quickly.
Observe the status LEDs on each power supply faceplate. If a DC power supply is
10.
correctly installed and functioning normally, the
LEDs light green steadily.
If any of the status LEDs indicates that the power supply is not functioning normally,
11.
repeat the installation and cabling procedures .
NOTE: After powering off a power supply, wait at least 60 seconds before
turning it back on. After powering on a power supply, wait at least 60
seconds before turning it off.
If the system is completely powered off when you power on the power
supply, the Routing Engine (or RCB) boots as the power supply completes
its startup sequence. If the Routing Engine finishes booting and you need
to power off the system again, first issue the CLI
command.
After a power supply is powered on, it can take up to 60 seconds for status
indicators—such as the status LEDs on the power supply and the
show chassis
functioning normally. Ignore error indicators that appear during the first
60 seconds.
On the external management device connected to the Routing Engine, monitor the
12.
startup process to verify that the system has booted properly.
Installing an MX240 DC High-Capacity Power Supply
Replacing an MX240 DC Power Supply Cable on page 320
Preventing Electrostatic Discharge Damage to an MX240 Router on page 380
DC Power Cable Specifications for the MX240 Router on page 56
Chapter 3: Initial Installation and Configuration
) position.
—
PWR OK
command display—to indicate that the power supply is
) position if you
O
, BRKR ON , and INPUT OK
request system halt
203