Replacing A T640 Dc Power Supply Cable On A Two-Input 160-A Power Supply, Three-Input 240-A Dc Power Supply, Or A Four-Input 240-Adc Power Supply - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
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Replacing a T640 DC Power Supply Cable on a Two-Input 160-A Power Supply, Three-Input
240-A DC Power Supply, or a Four-Input 240-A DC Power Supply
334
Switch on the customer site circuit breakers to provide voltage to the DC power source
15.
cables.
Verify that the
INPUT PRESENT
16.
indicating that the inputs are receiving power.
Switch the power switch on the power supply to the
17.
blinks momentarily, then lights steadily.
NOTE: After a power supply is powered on, it can take up to 60 seconds
for status indicators—such as the LEDs on the power supply, the command
output displays, and messages on the LED display on the craft interface—to
indicate that the power supply is functioning normally. Ignore error
indicators that appear during the first 60 seconds.
Verify that the DC OK LED on the power supply faceplate is lit steadily, indicating that
18.
the power supply is correctly installed and is functioning properly.
T640 Power System Description on page 60
T640 Six-Input DC Power Supply Description on page 69
T640 Six-Input DC Power Supply LEDs on page 70
Troubleshooting the T640 Power System on page 207
T640 DC Power Supply Electrical Specifications on page 428
Site Electrical Wiring Guidelines for Juniper Networks Devices on page 426
You can use this procedure to replace a DC power cable for a two-input 160-A power
supply, three-input 240-A DC power supply, or a four-input 240-A DC power supply.
The router has either one nonredundant power supply or two redundant, load-sharing
power supplies. Each DC power cable on a redundant power supply is hot-insertable and
hot-removable. When a redundant power supply is powered down, the other power
supply automatically assumes the entire electrical load for the router. If you have only
one power supply, you must power off the system before removing a DC power cable.
To replace a DC power supply cable, perform the following procedures:
Removing a T640 DC Power Supply Cable from a Two-Input 160-A Power Supply,
1.
Three-Input 240-A DC Power Supply, or a Four-Input 240-A DC Power
Supply on page 335
Installing a T640 DC Power Supply Cable on a Two-Input 160-A Power Supply,
2.
Three-Input 240-A DC Power Supply, or a Four-Input 240-A DC Power
Supply on page 337
LEDs on the power supply faceplate are lit steadily,
ON position (
Copyright © 2013, Juniper Networks, Inc.
| ). The DC OK LED