Juniper T640 Hardware Manual page 227

Copyright © 2013, Juniper Networks, Inc.
Grounding Cable and Lug Specifications" on page 425
Guidelines for Juniper Networks Devices" on page
Regularly inspect the air filters on each power supply for dust and debris, and replace
the side filter on AC power supplies or front filter element on AC and DC power supplies
every 6 months. To replace a power supply front air filter element, see
Front Air Filter Element on a T640 AC or DC Power Supply" on page
side air filter, see "Replacing a Side Air Filter on a T640 AC Power Supply" on page
Routinely check the LEDs on the DC power supply faceplates.
For a two-input 160-A DC power supply:
The blue LEDs light to indicate that the power supplies are functioning
DC OK
normally.
The LED is lit, indicating that the circuit breaker is on.
CB ON
For a three-input 240-A DC power supply or four-input 240-A DC power supply:
The blue DC OK LED is on, the power source is good and the power supplies are
functional.
Each
INPUT PRESENT
power.
The CB ON LED is lit, indicating that the circuit breaker is on.
For a six-input DC power supply:
The blue LED is on, the power source is good and the power supplies are
DC OK
functional.
Each
INPUT PRESENT
power.
Routinely check the LEDs on the AC power supply faceplates. For a three-phase delta
or wye AC power supply:
The green LED lights to indicate that the power supply is receiving source AC
AC OK
power.
The blue DC OK LED lights to indicate that the power supply is functioning normally.
Check the red and yellow alarm LEDs and the LCD on the craft interface. Power supply
failure or removal triggers an alarm that causes one or both of the LEDs to light and
an error message to appear on the LCD. You can display the associated error messages
by issuing the CLI command:
user@host> show chassis alarms
For a list of possible alarm messages, see
on page 207.
Issue the show chassis environment pem
supplies.
Chapter 15: Maintaining T640 Router Hardware Components
426.
LED is lit, indicating that the input is receiving source DC
LED is lit, indicating that the input is receiving source DC
"Troubleshooting the T640 Power System"
command to check the status of the power
and "Site Electrical Wiring
"Replacing a
373. To replace a
375.
195