Powering On a T640 Three-Input 240-A Power Supply
To power on a three-input 240-A power supply:
1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and
connect the strap to one of the ESD points on the chassis. For more information
about ESD, see Preventing Electrostatic Discharge Damage to an M Series, MX
Series, or T Series Routing Platform.
2. Switch on the customer site circuit breakers to provide voltage to the DC power
source cables.
3.
Verify that the INPUT PRESENT LEDs on the power supply faceplate are lit steadily,
indicating that the inputs are receiving power.
4.
Switch the circuit breakers on the power supply to the ON position (|).
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 show chassis command
display, 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.
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.
Replacing a T640 Four-Input 240-A DC Power Supply
1. Removing a T640 Four-Input 240-A DC Power Supply on page 18
2. Installing a T640 Four-Input 240-A DC Power Supply on page 20
Powering On a T640 Three-Input 240-A Power Supply ■ 17
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