Replacing A Front Air Filter Element On A T640 Ac Or Dc Power Supply; Removing A Front Air Filter Element On A T640 Ac Or Dc Power Supply - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
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Replacing a Front Air Filter Element on a T640 AC or DC Power Supply

294
Switch the power switch on the power supply to the
21.
Verify that the LED on the power supply faceplate is lit steadily, indicating that
DC OK
22.
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.
T640 Three-Phase Delta and Wye AC Power Supply Overview on page 57
T640 Three-Phase Delta and Wye AC Power Supply LEDs on page 60
Troubleshooting the T640 Power System on page 171
T640 Preventing Electrostatic Discharge Damage on page 306
T640 AC Power Cord Specifications on page 358
You can use this procedure for a two-input 160-A DC power supply, three-input 240-A
DC power supply, four-input 240-A DC power supply, three-phase delta AC power supply,
or three-phase wye AC power supply.
Removing a Front Air Filter Element on a T640 AC or DC Power Supply on page 294
1.
Installing a Front Air Filter Element on a T640 AC or DC Power Supply on page 295
2.

Removing a Front Air Filter Element on a T640 AC or DC Power Supply

To remove a power supply front air filter element (see Figure 172 on page 295):
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
1.
the strap to one of the ESD points on the chassis.
Grasp the filter cover on the power supply faceplate and pull it straight off the power
2.
supply.
Remove the front air filter element.
3.
position ( ).
ON |
DC OK LED
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