Replacing A T640 Three-Phase Delta Ac Power Supply; Removing A T640 Three-Phase Delta Ac Power Supply; Figure 214: Connecting Power To The Three-Phase Wye Ac Power Supply - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide

Replacing a T640 Three-Phase Delta AC Power Supply

354
Verify that the LED on the power supply faceplate is lit steadily, indicating that
21. AC OK
the AC terminal block is receiving power.
Switch the power switch on the power supply to the
22.
to the router components.
Verify that the LED on the power supply faceplate is lit steadily, indicating that
23. DC OK
the power supply is correctly installed and is functioning properly. The
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.
Repeat the procedure for the other power supply.
24.
Figure 214: Connecting Power to the Three–Phase Wye AC Power Supply
The T640 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.
Removing a T640 Three-Phase Delta AC Power Supply on page 354
1.
Installing a T640 Three-Phase Delta AC Power Supply on page 358
2.

Removing a T640 Three-Phase Delta AC Power Supply

To remove a three-phase delta AC power supply:
Switch off the customer site circuit breakers to the power supply being removed. Make
1.
sure that the voltage across the AC power source cord is 0 V and that there is no
chance that the cord might become active during the removal process.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
2.
the strap to one of the ESD points on the chassis.
Switch the power switch on the power supply faceplate to the standby position.
3.
ON position (
L1 L2 L3 N
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| ) to provide power
LED
DC OK