Juniper T640 Manuale utente

Replacing T640 Power System Components

The router has either one nonredundant power supply or two redundant, load-sharing

DC 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. See Powering Off the T640 Router.

To replace a power system component, perform the following procedures:

■Replacing a T640 Two-Input 160-A Power Supply on page 1

■Replacing a T640 Three-Input 240-A Power Supply on page 7

■Replacing a T640 Four-Input 240-A DC Power Supply on page 17

■Replacing a T640 Power Supply Cable on page 23

■Replacing a T640 Power Supply Filter Element on page 30

Replacing a T640 Two-Input 160-A Power Supply

■Removing a T640 Two-Input 160-A Power Supply on page 1

■Installing a T640 Two-Input Power Supply on page 4

Removing a T640 Two-Input 160-A Power Supply

The power supplies are located at the rear of the chassis below the SIBs. Each

two-input 160-A power supply weighs approximately 23 lb (10.5 kg).

CAUTION: Do not leave a power supply slot empty for more than 30 minutes while

the router is operational. For proper airflow, the power supply must remain in the

chassis, or a blank panel must be used in an empty slot.

Replacing T640 Power System Components ■1

To remove a power supply:

1. 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.

CAUTION: You must ensure that power connections maintain the proper polarity.

The power source cables might be labeled (+) and (–)to indicate their polarity. There

is no standard color coding for DC power cables. The color coding used by the external

DC power source at your site determines the color coding for the leads on the power

cables that attach to the terminal studs on each power supply.

2. For a nonredundant power supply, power off the system. See Powering Off the

T640 Router. For redundant power supplies, check that the other power supply

is functional.

3. 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.

4. Switch the circuit breakers on the power supply faceplate to the off position (O).

NOTE: After powering off a power supply, you must wait at least 60 seconds before

turning it back on.

5. Remove the clear plastic cover protecting the terminal studs on the faceplate.

6. Using a 7/16-in. (11 mm) nut driver, remove the nuts and washers from the

terminal studs (see Figure 1).

2■Removing a T640 Two-Input 160-A Power Supply

Figure 1: Disconnecting Power Cables from a Two-Input 160-A DC Power Supply

7. Remove the cable lugs from the terminal studs.

8. Loosen the captive screws on the cable restraints on the right edge of the power

supply faceplate.

9. Carefully move the power cables out of the way.

10. Loosen the captive screws on the lower corners of the power supply faceplate

completely. Twist the ejector handles on the upper corners of the faceplate

counterclockwise to unseat the power supply.

11. Twist the ejector handles on the upper corners of the faceplate counterclockwise

to unseat the power supply.

12. Grasp the handle on the power supply faceplate, and pull firmly to start removing

the power supply. Slide it halfway out of the chassis (see Figure 2).

WARNING: Do not touch the power connectors on the rear of the power supply (see

Figure 3). They can contain dangerous voltages.

13. Place one hand underneath the power supply to support it, and slide it completely

out of the chassis.

CAUTION: Each two-input 160-A power supply weighs approximately 23 lb (10.5 kg).

Be prepared to support the full weight of the power supply as you remove it from

the router.

Removing a T640 Two-Input 160-A Power Supply ■3

Figure 2: Removing a Power Supply

Figure 3: Rear of the Power Supply Showing Midplane Connectors

Installing a T640 Two-Input Power Supply

To install a power supply (see Figure 4):

4■Installing a T640 Two-Input Power Supply

1. 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 installation.

CAUTION: You must ensure that power connections maintain the proper polarity.

The power source cables might be labeled (+) and (–)to indicate their polarity. There

is no standard color coding for DC power cables. The color coding used by the external

DC power source at your site determines the color coding for the leads on the power

cables that attach to the terminal studs on each power supply.

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. For more information

about ESD, see Preventing Electrostatic Discharge Damage to an M Series, MX

Series, or T Series Routing Platform.

3. Switch the circuit breakers on the power supply faceplate to the off position (O).

4. Using both hands, slide the power supply into the chassis until you feel resistance.

5. Twist the ejector handles at the upper corners of the power supply faceplate

clockwise until they stop.

6. Tighten the captive screws at the lower corners of the power supply faceplate

to secure the power supply in the chassis.

7. Remove the clear plastic cover protecting the terminal studs on the faceplate.

8. Remove the nut and washer from each power terminal stud. If no washers and

nuts are already installed, they should be in the accessory box.

9. Secure the cable lug on the DC power cable to the terminal stud, first with a

washer, then with a nut (see Figure 5). Use a 7/16-in. (11 mm) nut driver or

wrench to tighten the nut (see Figure 4). Apply between 23 lb-in. (2.6 Nm) and

25 lb-in. (2.8 Nm) of torque to each nut:

a. Secure each positive (+) DC source power cable lug to a RTN (return)

terminal.

b. Secure each negative (–) DC source power cable lug to a –48V (input) terminal.

NOTE: All inputs on the two-input 160-A DC power supply in slot PEM0 must be

two-input 160-A DC power supply in slot PEM1 must be powered by dedicated power

feeds derived from feed B. This configuration provides the commonly deployed A/B

feed redundancy for the system.

NOTE: INPUT 0 and INPUT 1 on the three-input 240-A DC power supply in slot PEM0

must be powered by dedicated power feeds derived from feed A, and INPUT 0 and

INPUT 1 on the three-input 240-A DC power supply in slot PEM1 must be powered

by dedicated power feeds derived from feed B. This configuration provides the

commonly deployed A/B feed redundancy for the system.

Installing a T640 Two-Input Power Supply ■5

CAUTION: You must ensure that power connections maintain the proper polarity.

The power source cables might be labeled (+) and (–)to indicate their polarity. There

is no standard color coding for DC power cables. The color coding used by the external

DC power source at your site determines the color coding for the leads on the power

cables that attach to the terminal studs on each power supply.

10. Loosen the captive screws on the cable restraints on the right edge of the power

supply faceplate.

11. Route the positive and negative DC power cables through the top and bottom

of each cable restraint.

12. Tighten the cable restraint captive screws to hold the power cables in place.

13. Verify that the power cabling is correct, that the cables are not touching or

blocking access to router components, and that they do not drape where people

could trip on them.

14. Replace the clear plastic cover over the terminal studs on the faceplate.

15. Switch the circuit breakers on the power supply to the on position (|).

NOTE: If you have only one power supply, or 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.

16. Check the LEDs on the power supply faceplate. If the power supply is correctly

installed and is functioning properly, the DC OK LED lights steadily, and the CB

ON LED 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 output status LEDs on the power supply, the show chassis

command display, 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.

NOTE: After powering on a power supply, wait at least 60 seconds before turning it

off. If you have only one power supply, power off the system before turning off the

power supply. See Powering Off the T640 Router.

6■Installing a T640 Two-Input Power Supply

Figure 4: Installing a Replacement Power Supply

Figure 5: Connecting Power Cables to the Power Supply

Replacing a T640 Three-Input 240-A Power Supply

To replace a three-input 240-A power supply, perform the following procedures:

■Removing a T640 Three-Input 240-A Power Supply on page 8

■Setting the T640 Input Mode Switch on a Three-Input 240-A Power

Supply on page 11

■Installing a T640 Three-Input 240-A Power Supply on page 12

Replacing a T640 Three-Input 240-A Power Supply ■7

■Replacing the T640 Cable Restraint on a Three-Input 240-A Power

Supply on page 13

■Connecting DC Power to a Three-Input 240-A Power Supply in a T640

Router on page 15

■Powering On a T640 Three-Input 240-A Power Supply on page 17

Removing a T640 Three-Input 240-A Power Supply

To remove a three-input 240-A power supply:

1. Switch off the external 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. For more information

about ESD, see Preventing Electrostatic Discharge Damage to an M Series, MX

Series, or T Series Routing Platform.

3. Switch the circuit breakers on the power supply faceplate to the off position (O).

Figure 6: Three-Input 240-A Power Supply

NOTE: After powering off a power supply, wait at least 60 seconds before turning it

back on.

4. Remove the clear plastic cover protecting the terminal studs on the faceplate.

5. Using a 7/16-in. (11 mm) nut driver or wrench, remove the nuts and washers

from the terminal studs (see Figure 7).

8■Removing a T640 Three-Input 240-A Power Supply

CAUTION: You must ensure that power connections maintain the proper polarity.

The power source cables might be labeled (+) and (–)to indicate their polarity. There

is no standard color coding for DC power cables. The color coding used by the external

DC power source at your site determines the color coding for the leads on the power

cables that attach to the terminal studs on each power supply.

Figure 7: Disconnecting Power Cables from the DC Power Supply

6. Remove the cable lugs from the terminal studs.

7. Loosen the captive screw or screws on the cable restraint on the right edge of

the power supply faceplate.

8. Carefully move the power cables out of the way.

9. Loosen the captive screws on the lower corners of the power supply faceplate

completely.

10. Twist the ejector handles on the upper corners of the faceplate counterclockwise

to unseat the power supply.

11. Grasp the handle on the power supply faceplate and pull firmly. Slide it halfway

out of the chassis (see Figure 9).

12. Place one hand underneath the power supply to support it, and slide it completely

out of the chassis.

Removing a T640 Three-Input 240-A Power Supply ■9

WARNING: Do not touch the power connectors on the rear of the power supply (see

Figure 8). They can contain dangerous voltages.

Figure 8: Rear of the Power Supply Showing Midplane Connectors

CAUTION: Each three-input 240-A power supply weighs approximately 25 lb (11.3 kg).

Be prepared to support the full weight of the power supply as you remove it from

the routing platform.

CAUTION: Do not leave a power supply slot empty for more than a short time while

the router is operational. For proper airflow, the power supply must remain in the

chassis or a blank panel must be used in an empty slot.

10 ■Removing a T640 Three-Input 240-A Power Supply

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