Juniper T640 Hardware Manual page 281

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Turn on the power to the external management device.
4.
Switch on the dedicated customer site circuit breakers to provide power to the AC
5.
power cables. Follow your site's procedures.
Verify that the AC OK LED on both AC power supply faceplates are lit steadily green,
6.
indicating that the power supplies are receiving power.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
7.
the strap to one of the ESD points on the chassis.
Switch the power switch on one of the power supplies to the
8.
LED blinks momentarily, then lights steadily.
OK
NOTE: After a power supply is powered on, it can take up to 60 seconds
for status indicators—such as the output status LEDs on the power supply,
the command output, and messages on the LCD 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 LED on the AC power supply faceplate is lit steadily, indicating
DC OK
9.
that power supply is correctly installed, functioning properly, and providing power to
the DC outputs.
On the external management device connected to the Routing Engine, monitor the
10.
startup process to verify that the system has booted properly.
NOTE: 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, you must power off the
router before powering it on again. After powering on a power supply, wait
at least 60 seconds before turning it off. After powering off a power supply,
wait at least 60 seconds before turning it back on.
T640 Three-Phase Delta and Wye AC Power Supply Description on page 106
Connecting AC Power to a T640 Router with Three-Phase Delta AC Power Supplies
on page 241
Connecting AC Power to a T640 Router with Three-Phase Wye AC Power Supplies on
page 244
Powering Off the T640 Router on page 248
Chapter 22: Providing Power to the T640
ON position ( | ). The DC
247