5. Verify that the CB ON LEDs on the power supply faceplate are lit steadily. The CB ON
LEDs blink momentarily, then light steadily to indicate that the circuit breakers are on.
6. Verify that the DC OK LED on the power supply faceplate is lit steadily, indicating that
the power supply is correctly installed and is functioning properly.
NOTE: 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 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 request system halt command.
After powering off a power supply, wait at least 60 seconds before turning
it back on.
Related
Documentation
T640 Power System Description on page 95•
• Maintaining the T640 Power Supplies on page 456
• T640 DC Power Supply Electrical Specifications on page 126
• Site Electrical Wiring Guidelines for Juniper Networks Devices on page 538
Replacing a T640 Four-Input 240-A DC Power Supply
The router has either one nonredundant power supply or two redundant, load-sharing
power supplies. Each redundant power supply is hot-insertable and hot-removable.
When a redundant power supply is powered down or removed, 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 the power supply.
1.
Removing a T640 Four-Input 240-A DC Power Supply on page 366
2.
Installing a T640 Four-Input 240-A DC Power Supply on page 370
Removing a T640 Four-Input 240-A DC Power Supply
To remove a four-input 240-A DC power supply:
1. Switch off the customer site circuit breakers to the power supply being removed. Make
sure that the voltage across the DC power source cable leads is 0 V and that there is
no chance that the cables might become active during the removal process.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
the strap to one of the ESD points on the chassis.
3. Switch the circuit breakers on the power supply faceplate to the off position (O).
Copyright © 2017, Juniper Networks, Inc.366
T640 Core Router Hardware Guide
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