Juniper T640 User manual

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
powered by dedicated power feeds derived from feed A, and all inputs on the
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

Figure 9: Removing a Power Supply
Setting the T640 Input Mode Switch on a Three-Input 240-A Power Supply
NOTE: Do not set the input mode switch if the power supply is installed in the chassis.
If the power supply is already installed, you must disconnect all cables and remove
the power supply before setting the input mode switch.
To set the input mode switch (see Figure 10):
1. Using a screwdriver, loosen the captive screw holding the metal cover over the
input mode switch (see Figure 10).
2. Rotate the metal cover away from the input mode switch to expose the switch.
3. Check the setting of the input mode switch. Use a flashlight, if necessary. In
Two-INPUT mode, the switch must be located all the way to the right.
4. If the input mode switch is not set correctly, use a sharp, nonconductive object
to slide the switch all the way to the right to set the power supply to Two-INPUT.
CAUTION: Do not use a pencil, because fragments can break off and cause damage
to the power supply.
5. Rotate the metal cover over the input mode switch, and use a screwdriver to
tighten the captive screw.
Setting the T640 Input Mode Switch on a Three-Input 240-A Power Supply ■11

Figure 10: Three-Input 240-A Power Supply
Installing a T640 Three-Input 240-A Power Supply
Each three-input 240-A power supply weighs approximately 25 lb (11.3 kg). To install
a three-input 240-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 installation.
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
(see Figure 11).
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.
12 ■Installing a T640 Three-Input 240-A Power Supply

Figure 11: Installing a Three-Input 240-A Power Supply
Replacing the T640 Cable Restraint on a Three-Input 240-A Power Supply
Each three-input 240-A power supply is shipped with the standard cable restraint,
as shown in “Standard Cable Restraint on a Three-Input 240-A Power Supply”on
page 13. Two optional cable restraints are shipped in the accessory box.
If your DC power cables are too large or inflexible to fit into the standard cable
restraint, we recommend that you remove the standard cable restraint and install
the optional cable restraint (see “Optional Cable Restraint on a Three-Input 240-A
Power Supply”on page 14) on each three-input 240-A power supply.
NOTE: Before you remove a chassis from a rack or cabinet, you must remove the
optional cable restraint from the three-input 240-A power supply.
To replace the cable restraint on a three-input 240-A power supply:
■Removing the T640 Standard Cable Restraint from a Three-Input 240-A Power
Supply on page 13
■Installing the T640 Optional Cable Restraint on a Three-Input 240-A Power
Supply on page 14
Removing the T640 Standard Cable Restraint from a Three-Input 240-A Power
Supply
The cable restraint is located on the right edge of the power supply faceplate. To
remove the standard cable restraint from a three-input 240-A power supply:
1. Loosen the captive screw on the standard cable restraint or captive screws on
the optional cable restraint.
2. Remove the cable restraint from the power supply.
Replacing the T640 Cable Restraint on a Three-Input 240-A Power Supply ■13

Figure 12: Standard Cable Restraint on a Three-Input 240-A Power Supply
Installing the T640 Optional Cable Restraint on a Three-Input 240-A Power Supply
To install the optional cable restraint on a three-input 240-A power supply:
1. Align the two captive screws on the optional cable restraint with the two threaded
holes located at the right edge of the power supply faceplate.
2. Fasten the captive screws.
Figure 13: Optional Cable Restraint on a Three-Input 240-A Power Supply
14 ■Installing the T640 Optional Cable Restraint on a Three-Input 240-A Power Supply

Connecting DC Power to a Three-Input 240-A Power Supply in a T640
Router
To connect a three-input 240-A power supply to the power sources:
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. Verify that a licensed electrician has attached cable lugs to the power cables that
you supply.
3. Verify that the voltage across the DC power source cables leads is 0 V and that
there is no chance that the cables might become active during installation. If
needed, switch off the customer site circuit breakers.
4. Verify that the circuit breakers on the power supply faceplate are in the OFF
position (O).
5. Remove the clear plastic cover protecting the terminal studs on the faceplate.
6. Remove the nut and washer from each power terminal stud.
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.
7. Secure the cable lugs to the terminal studs, first with a washer, then with a nut
(see Figure 14).
a. Attach the positive (+) DC source power cable lugs to the RETURN (return)
terminals.
b. Attach the negative (–) DC source power cable lugs to the –48V (input)
terminals.
Use a 7/16-in. (11-mm) nut driver or wrench to tighten the nut. Apply between
23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut.
NOTE: For power supplies set to 2-INPUT mode (required for the T640 routing node),
connect two DC power cables, one for RETURN and one for -48 V to Input 0 and two
DC power cables, one for RETURN and one for -48 V to Input 1.
Connecting DC Power to a Three-Input 240-A Power Supply in a T640 Router ■15

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.
8. Loosen the captive screw or screws on the cable restraint on the right edge of
the power supply faceplate.
9. Route the DC power cables through the cable restraint.
10. Tighten the cable restraint captive screw or screws to hold the power cables in
place.
11. Verify that the power cabling is correct, that the power cables are not touching
or blocking access to other hardware components, and that they do not drape
where people could trip on them.
12. Replace the clear plastic cover over the terminal studs on the faceplate.
Figure 14: Connecting Power Cables to the Power Supply
16 ■Connecting DC Power to a Three-Input 240-A Power Supply in a T640 Router

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

Removing a T640 Four-Input 240-A DC Power Supply
The router has two redundant, load-sharing DC power supplies. Each power supply
is hot-insertable and hot-removable. When one power supply is powered down or
removed, the other power supply automatically assumes the entire electrical load
for the router.
To remove a four-input 240-A DC power supply:
1. Switch off the customer site 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.
3. Switch the circuit breakers on the power supply faceplate to the off position (O).
Figure 15: Four-Input 240-A DC Power Supply
g004659
LEDs Circuit breakers
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, remove the nuts and washers from the
terminal studs (see Figure 16).
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.
18 ■Removing a T640 Four-Input 240-A DC Power Supply

Figure 16: Disconnecting Power Cables from the Four-Input 240-A DC Power Supply
g004661
Terminal studsCable lug
Locking
washer
Nut
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 17).
12. Place one hand underneath the power supply to support it and slide it completely
out of the chassis.
CAUTION: Each four-input 240-A DC power supply weighs approximately 26.6 lb.
(12.0 kg). Be prepared to support the full weight of the power supply as you remove
it from the routing platform.
Removing a T640 Four-Input 240-A DC Power Supply ■19

Figure 17: Removing a Four-Input 240-A DC Power Supply
g004663
WARNING: Do not touch the power connectors on the rear of the power supply (see
Figure 18). They can contain dangerous voltages.
Figure 18: Rear of the Power Supply Showing Midplane Connectors
Installing a T640 Four-Input 240-A DC Power Supply
Each four-input 240-A DC power supply weighs approximately 26.6 lb. (12.0 kg). To
install a four-input 240-A DC 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.
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.
3. Switch the circuit breakers on the power supply faceplate to the OFF position (O).
20 ■Installing a T640 Four-Input 240-A DC Power Supply