Maintaining MX2008 Power System Components

Replacing an MX2008 AC Power Supply Module

• Removing an MX2008 AC Power Supply Module

• Installing an MX2008 AC Power Supply Module

Removing an MX2008 AC Power Supply Module

Before you remove a PSM, be aware of the following:

1. With one PSM installed and operational, remove any additional PSM by turning the power switch to the off (O) position.
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. Loosen the two captive screws on the PSM faceplate.
4. While grasping the handle on the PSM faceplate with one hand, use your other hand to guide the PSM away from the chassis.
5. Pull the PSM straight out of the chassis.Caution

   Do not touch the power connectors on back of the PSM. They can get damaged.

6. Place the PSM module into an antistatic bag.Note

   Each PSM slot not occupied by an AC PSM must be covered by a PSM blank panel.

Figure 1: Removing an AC Power Supply Module from the MX2008 Router

Installing an MX2008 AC Power Supply Module

Before you install a PSM, be aware of the following:

1. With one PSM installed and operational, install an additional PSM with the power supply switch in the off (O) or in the on (|) position.Warning

   If there is only one PSM installed and operational, the power supply switch must be placed in the off (O) position.

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. While grasping the handle on the PSM faceplate with one hand, use your other hand to guide the power supply module into the chassis.
4. Tighten the captive screws on the PSM faceplate.
5. Turn on the power switch to the on (|) position.
6. Verify that the PWR OK LED is lit steadily green.

Figure 2: Installing an AC Power Supply Module

Replacing an MX2000 Three-Phase Delta AC Power Distribution Module

1. Removing an MX2000 Three-Phase Delta AC Power Distribution Module

2. Installing an MX2000 Router Three-Phase Delta AC Power Distribution Module

Removing an MX2000 Three-Phase Delta AC Power Distribution Module

Before you remove a three-phase delta AC PDM, be aware of the following:

1. Make 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.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See instructions for your site.
3. Disconnect the AC power cord (see Figure 3) from the power source.

   Figure 3: Three-Phase Delta AC Power Cord

   

4. Remove the ESD grounding strap from the approved site ESD grounding point. See the instructions for your site. Reconnect the strap to one of the ESD points on the chassis.
5. Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the metal wiring compartment that protects the AC terminal block.
6. Remove the cover of the metal AC wiring compartment.
7. Disconnect the wires from the AC terminal block on the three-phase delta AC PDM (see Figure 4), loosen each of the input terminals or grounding point screws, and remove each wire form the grounding point or input terminal.

   To remove wires from the terminal block that serves six PSMs:

   1. Remove the wire labeled L3 from the input terminal labeled C1.

   2. Remove the wire labeled L2 from the input terminal labeled B1.

   3. Remove the wire labeled L1 from the input terminal labeled A1.

   4. Remove the grounding wire from the grounding point labeled GND.

   Figure 4: Disconnecting the Power Cord from a Three-Phase Delta AC Power Distribution Module

   

   To remove wires from the terminal block that serves three PSMs:

   1. Remove the wire labeled L3 from the input terminal labeled C2.

   2. Remove the wire labeled L2 from the input terminal labeled B2.

   3. Remove the wire labeled L1 from the input terminal labeled A2.

   4. Remove the grounding wire from the grounding point labeled GND.

   Note

   The three-phase delta AC PDM terminal blocks will be flipped depending on which slot the PDM gets plugged into.

   Note

   The color of each AC power wire might vary. The MX2000 chassis is not sensitive to phase rotation sequence—either clockwise or counterclockwise will operate correctly.

   Note

   The terminal connections have either slotted screws or hex screws. Use a 1/4-in. slotted screwdriver for the slotted screws. Use a 5/32-in. (4 mm) Allen wrench for the 5/16-in. hex screws.

8. Loosen the plastic cable tie fastening the AC power cord to the PDM.
9. Loosen and remove the retaining nut from the AC power cord.
10. Pull the AC power cord out of the metal wiring compartment.
11. Carefully move the AC power cable out of the way.
12. Disconnect both of the AC power cords from the AC PDM.
13. Loosen the two captive screws on the locking levers of the PDM faceplate completely.
14. Pull the locking levers on either side of the faceplate up to unseat the PDM.
15. Grasp the levers on the PDM faceplate and pull firmly. Slide it halfway out of the chassis (see Figure 5, Figure 6 (MX2010), and Figure 7 (MX2008).Caution

    Each three-phase delta AC PDM weighs approximately 12  lb (5.44 kg). Be prepared to support the full weight of the PDM as you remove it from the router.

16. Place one hand underneath the PDM to support it, and slide it completely out of the chassis.

Figure 5: Removing a Three-Phase Delta AC Power Distribution Module (MX2020 Router)

Figure 6: Removing a Three-Phase Delta AC Power Distribution Module (MX2010 Router)

Figure 7: Removing a Three-Phase Delta AC Power Distribution Module (MX2008 Router)

Installing an MX2000 Router Three-Phase Delta AC Power Distribution Module

Before you install a three-phase delta AC power distribution module (PDM), be aware of the following:

1. Make 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 installation 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. [Optional]—If you are switching from a DC PDM to an AC PDM, see Converting an MX2000 Router Between AC and DC Power for instructions on how to change the setting on the internal bar of the power distribution unit (PDU) cage to AC.
4. Pull the locking levers on either side of the faceplate away until they stop.
5. Using both hands, slide the PDM into the chassis until you feel resistance (see Figure 8Figure 9, and Figure 10).
6. Push the lock levers until they make contact with the PDM faceplate.
7. Tighten the two captive screws on the locking levers of the PDM faceplate to secure the PDM in the chassis. Apply between 10 lb-in. (1.13 Nm) to 12 lb-in. (1.35 Nm) of torque to each screw. Do not overtighten the screws.
8. Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the metal wiring compartment that protects the AC terminal block.

   Figure 8: Installing a Three-Phase Delta AC Power Distribution Module (MX2020)

   

   Figure 9: Installing a Three-Phase Delta AC Power Distribution Module (MX2010)

   

   Figure 10: Installing a Three-Phase Delta AC Power Distribution Module (MX2008)

   

9. Remove the cover of the metal AC wiring compartment.
10. Unscrew the retaining nut from the AC power cord.
11. Place the retaining nut inside the metal wiring compartment.
12. Insert the wires of the AC power cord through the hole of the retaining nut and rubber grommet.
13. Insert the wires of the AC power cord through the hole of the metal wiring compartment.
14. Connect the wires to the AC terminal block on the three-phase delta AC PDM (see Figure 11). Loosen each of the input terminals or grounding point screws, and insert the wire into the grounding point or input terminal, and tighten the screw (see Table 1 for approved AC wire gauge).

    To insert wires into the terminal block that serves six PSMs:

    1. Insert the grounding wire into the grounding point labeled GND.

    2. Insert the wire labeled L1 into the input terminal labeled A1.

    3. Insert the wire labeled L2 into the input terminal labeled B1.

    4. Insert the wire labeled L3 into the input terminal labeled C1.

    Figure 11: Connecting Power to a Three-Phase Delta AC Power Distribution Module

    

    Note

    The three-phase delta AC PDM terminal blocks will be flipped depending on which slot the PDM gets plugged into.

    Note

    The color of each AC power wire might vary. The MX2000 chassis is not sensitive to phase rotation sequence—either clockwise or counterclockwise will operate correctly.

    Caution

    Wire label configuration is for Juniper Networks supplied cable only. If you are using your own cable, make sure you use the proper connections.

    To insert wires into the terminal block that serves three PSMs:

    1. Insert the grounding wire into the grounding point labeled GND.

    2. Insert the wire labeled L1 into the input terminal labeled A2.

    3. Insert the wire labeled L2 into the input terminal labeled B2.

    4. Insert the wire labeled L3 into the input terminal labeled C2.

    Note

    The terminal connections have either slotted screws or hex screws. Use a 1/4-in. slotted screwdriver for the slotted screws. Use a 5/32-in. (4 mm) Allen wrench for the 5/16-in. hex screws.

    Warning

    To protect power supplies from input voltage that might be caused by mis-wired PDMs, before reinstalling the metal cover to the wiring compartment, apply AC voltage to the PDM (with the PSM power switch turned off). Verify that the two LEDs on the PDM are lit green and that the AC voltage between AC terminal blocks A1-B1, B1-C1, C1-A1, A2-B2, B2-C2, and C2-A2 for three-phase delta PDM is not more than 264 VAC when measured with a digital voltage meter (DVM). Then turn off the AC breaker to remove power from the PDM and install the metal cover.

    Note

    Three-phase delta AC wire assembly kits can be purchased from Juniper Networks.

    Table 1: Supported Three-Phase Delta AC Wire Gauge

    Wire Gauge	Description
    4 x 6-AWG or equivalent	4 conductor wires, each wire is 6-AWG

    Note

    We recommend that you use the proper gauge wire in order for the cable clamps to hold the AC cables. Using smaller gauge wiring will result in the cable clamps not tightening properly.

    Warning

    Power connections must be performed by a licensed electrician only.

15. Verify that the power cord wire connections are correct.
16. Screw the retaining nut onto the AC power cord to secure it to the metal wiring compartment.
17. Using a number 2 Phillips (+) screwdriver, tighten the four captive screws on the metal AC wiring compartment.
18. Verify that the AC power cord does not touch or block access to router components, and that it does not drape where people could trip on it.
19. Remove the ESD grounding strap from the ESD points on the chassis. Connect the strap to an approved site ESD grounding point. See the instructions for your site.
20. Connect the AC power cord plug to the power source.
21. Switch on the customer-site circuit breakers to provide voltage on the AC power cord.
22. Remove the ESD grounding strap from the approved site ESD grounding point. See the instructions for your site. Reconnect the strap to one of the ESD points on the chassis.
23. Verify that the LED on the PDM faceplate is lit steadily, indicating that the AC terminal block is receiving power.

Replacing an MX2008 Three-Phase Delta AC Power Cord

• Removing an MX2008 Three-Phase Delta AC Power Cord

• Installing an MX2008 Three-Phase Delta AC Power Cord

Removing an MX2008 Three-Phase Delta AC Power Cord

1. Switch off the customer-site circuit breakers to the PDM being removed. Make 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 installation 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 power switch on the PSM faceplate to the off (O) position.Note

   After powering off a PSM, wait at least 60 seconds before turning it back on.

4. Remove the ESD grounding strap from the ESD point on the chassis, and attach it to an approved site ESD grounding point. See the instructions for your site.
5. Disconnect the AC power cord (see Figure 12) from the power source.

   Figure 12: Three-Phase Delta AC Power Cord

   

6. Remove the ESD grounding strap from the approved site ESD grounding point. See the instructions for your site. Reconnect the strap to one of the ESD points on the chassis.
7. Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the metal wiring compartment that protects the AC terminal block.
8. Remove the cover of the metal wiring compartment.
9. Disconnect the wires from the AC terminal block on the three-phase delta AC PDM (see Figure 13). Loosen each of the input terminals or grounding point screws, and remove each wire from the grounding point or input terminal.Note

   The terminal connections have either slotted screws or hex screws. Use a 1/4-in. slotted screwdriver for the slotted screws. Use a 5/32-in. (4 mm) Allen wrench for the 5/16-in. hex screws.

   To remove wires from the terminal block that serves six PSMs:

   1. Remove the wire labeled L3 from the input terminal labeled C1.

   2. Remove the wire labeled L2 from the input terminal labeled B1.

   3. Remove the wire labeled L1 from the input terminal labeled A1.

   4. Remove the grounding wire from the grounding point labeled GND.

   Figure 13: Disconnecting the Power Cord from a Three-Phase Delta AC Power Distribution Module

   

   To remove wires from the terminal block that serves three PSMs:

   1. Remove the wire labeled L3 from the input terminal labeled C2.

   2. Remove the wire labeled L2 from the input terminal labeled B2.

   3. Remove the wire labeled L1 from the input terminal labeled A2.

   4. Remove the grounding wire from the grounding point labeled GND.

   Note

   The three-phase delta AC PDM terminal blocks will be flipped depending on which slot the PDM gets plugged into.

10. Loosen the plastic cable tie fastening the AC power cord to the PDM.
11. Loosen and remove the retaining nut from the AC power cord.
12. Pull the AC power cord out of the metal wiring compartment.
13. Carefully move the AC power cable out of the way.
14. Disconnect the AC power cord from the AC PDM.

Installing an MX2008 Three-Phase Delta AC Power Cord

1. Switch off the customer-site circuit breakers to the PDM being removed. Make 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 installation 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 power switches on all the PSM faceplates to the off (O) position for any PSMs that are powered only from this PDM.Note

   After powering off a PSM, wait at least 60 seconds before turning it back on.

4. Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the metal wiring compartment that protects the AC terminal block.
5. Remove the cover of the metal AC wiring compartment.
6. Unscrew the retaining nut from the AC power cord.
7. Place the retaining nut inside the metal wiring compartment.
8. Insert the wires of the AC power cord through the hole of the retaining nut and rubber grommet.
9. Insert the wires of the AC power cord through the hole of the metal wiring compartment.
10. Connect the wires to the AC terminal block on the three-phase delta AC PDM (see Figure 14). Loosen each of the input terminal or grounding point screws, and insert the wire into the grounding point or input terminal, and tighten the screw (see Table 2 for approved AC wire gauge).

    To insert wires into the terminal block that serves six PSMs:

    1. Insert the grounding wire into the grounding point labeled GND.

    2. Insert the wire labeled L1 into the input terminal labeled A1.

    3. Insert the wire labeled L2 into the input terminal labeled B1.

    4. Insert the wire labeled L3 into the input terminal labeled C1.

    Figure 14: Connecting Power to a Three-Phase Delta AC Power Distribution Module

    

    Note

    The three-phase delta AC PDM terminal blocks will be flipped depending on which slot the PDM gets plugged into.

    Note

    The color of each AC power wire might vary. The MX2008 chassis is not sensitive to phase rotation sequence—either CW or CCW will operate correctly.

    Caution

    Wire label configuration is for Juniper Networks supplied cable only. If you are using your own cable, make sure you use the proper connections.

    To insert wires into the terminal block that serves three PSMs:

    1. Insert the grounding wire into the grounding point labeled GND.

    2. Insert the wire labeled L1 into the input terminal labeled A2.

    3. Insert the wire labeled L2 into the input terminal labeled B2.

    4. Insert the wire labeled L3 into the input terminal labeled C2.

    Note

    The terminal connections have either slotted screws or hex screws. Use a 1/4-in. slotted screwdriver for the slotted screws. Use a 5/32-in. (4 mm) Allen wrench for the 5/16-in. hex screws.

    Warning

    To protect power supplies from input voltage that might be caused by mis-wired PDMs, before reinstalling the metal cover to the wiring compartment, apply AC voltage to the PDM (with disengaged PSM) to make sure that two LEDs on the PDM are lit green and that the AC voltage between AC terminal blocks A1-B1, B1-C1, C1-A1, A2-B2, B2-C2, and C2-A2 for three-phase delta PDM is not more than 264 VAC when measured with a digital voltage meter (DVM). Then turn off the AC breaker, de-energizing the PDM, and install the metal cover and engage all AC PSMs.

    Note

    Three-phase delta AC wire assembly kits can be purchased from Juniper Networks.

    Table 2: Supported Three-Phase Delta AC Wire Gauge

    Wire Gauge	Description
    4 x 6-AWG or equivalent	4 conductor wires, each wire is 6-AWG

    Note

    We recommend that you use the proper gauge wire in order for the cable clamps to hold the AC cables. Using smaller gauge wiring will result in the cable clamps not tightening properly.

    Warning

    Power connections must be performed by a licensed electrician only.

11. Verify that the power cord wire connections are correct.
12. Screw the retaining nut onto the AC power cord to secure it to the metal wiring compartment.
13. Using a number 2 Phillips (+) screwdriver, tighten the four captive screws on the metal AC wiring compartment.
14. Verify that the AC power cord does not touch or block access to router components, and that it does not drape where people could trip on it.
15. Remove the ESD grounding strap from the ESD points on the chassis. Connect the strap to an approved site ESD ground point. See the instructions for your site.
16. Connect the AC power cord plug to the power source.
17. Switch on the customer-site circuit breakers to provide voltage to the AC power cord.
18. Remove the ESD grounding strap from the approved site ESD grounding point. See the instructions for your site. Reconnect the strap to one of the ESD points on the chassis.
19. Verify the LED on the PDM faceplate is lit steadily, indicating that the AC terminal block is receiving power.
20. Switch the power switch on the PSM to the on (|) position to provide power to the router components.Note

    After a PDM is powered on, it can take up to 60 seconds for status indicators—such as the LEDs on the PDM, the command output displays, and messages on the LED display on the craft interface—to indicate that the PDM is functioning normally. Ignore error indicators that appear during the first 60 seconds.

Replacing an MX2020 Three-Phase Wye AC Power Distribution Module

1. Removing an MX2000 Three-Phase Wye AC Power Distribution Module

2. Installing an MX2000 Router Three-Phase Wye AC Power Distribution Module

Removing an MX2000 Three-Phase Wye AC Power Distribution Module

Before you remove a three-phase wye AC Power Distribution Module (PDM), be aware of the following:

1. Make 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.
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. Remove the ESD grounding strap from the ESD point on the chassis, and attach it to an approved site ESD grounding point. See instructions for your site.
4. Disconnect the AC power cord (see Figure 15) from the power source.

   Figure 15: Three-Phase Wye AC Power Cord

   

5. Remove the ESD grounding strap from the approved site ESD grounding point. See the instructions for your site. Reconnect the strap to one of the ESD points on the chassis.
6. Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the metal wiring compartment that protects the AC terminal block.
7. Remove the cover of the metal AC wiring compartment.
8. Disconnect the wires from the AC terminal block on the three-phase wye AC PDM (see Figure 16), loosen each of the input terminals or grounding point screws, and remove each wire from the grounding point or input terminal.

   To remove wires from the terminal block that serves six PSMs:

   1. Remove the wire labeled N from the input terminal labeled N1.

   2. Remove the wire labeled L3 from the input terminal labeled C1.

   3. Remove the wire labeled L2 from the input terminal labeled B1.

   4. Remove the wire labeled L1 from the input terminal labeled A1.

   5. Remove the grounding wire from the grounding point labeled GND.

   Figure 16: Disconnecting the Power Cord from a Three-Phase Wye AC Power Distribution Module

   

   To remove wires from the terminal block that serves three PSMs:

   1. Remove the wire labeled N from the input terminal labeled N2.

   2. Remove the wire labeled L3 from the input terminal labeled C2.

   3. Remove the wire labeled L2 from the input terminal labeled B2.

   4. Remove the wire labeled L1 from the input terminal labeled A2.

   5. Remove the grounding wire from the grounding point labeled GND.

   Note

   The three-phase wye AC PDM terminal blocks will be flipped depending on which slot the PDM gets plugged in to.

   Note

   The terminal connections have either slotted screws or hex screws. Use a 1/4-in. slotted screwdriver for the slotted screws. Use a 5/32-in. (4 mm) Allen wrench for the 5/16-in. hex screws.

9. Loosen the plastic cable tie fastening the AC power cord to the PDM.
10. Loosen and remove the retaining nut from the AC power cord.
11. Pull the AC power cord out of the metal wiring compartment.
12. Carefully move the AC power cable out of the way.
13. Disconnect the AC power cord from the AC PDM.
14. Loosen the two captive screws on the locking levers of the PDM faceplate completely.
15. Pull the locking levers on either side of the faceplate up to unseat the PDM.
16. Grasp the levers on the PDM faceplate and pull firmly. Slide it halfway out of the chassis (see Figure 17, Figure 18, and Figure 19).Caution

    Each three-phase wye AC PDM weighs approximately 12 lb (5.44 kg). Be prepared to support the full weight of the PDM as you remove it from the router.

17. Place one hand underneath the PDM to support it, and slide it completely out of the chassis.

Figure 17: Removing an MX2020 Three-Phase Wye AC PDM

Figure 18: Removing an MX2010 Three-Phase Wye AC Power Distribution Module

Figure 19: Removing an MX2008 Three-Phase Wye AC Power Distribution Module

Installing an MX2000 Router Three-Phase Wye AC Power Distribution Module

Each three-phase wye AC PDM weighs approximately 12 lb (5.44 kg). To install a three-phase wye AC PDM:

1. Make 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 installation 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. [Optional]—If you are switching from a DC PDM to an AC PDM, see Converting an MX2000 Router Between AC and DC Power for instructions on how to change the setting on the internal bar of the power distribution unit (PDU) cage to AC.
4. Pull the locking levers on either side of the faceplate away until they stop.
5. Using both hands, slide the PDM into the chassis until you feel resistance (see Figure 20, Figure 21, or Figure 22.

   Figure 20: Installing a Three-Phase Wye AC PDM (MX2020)

   

   Figure 21: Installing a Three-Phase Wye AC PDM (MX2010)

   

   Figure 22: Installing an Three-Phase Wye AC PDM (MX2008)

   

6. Push the lock levers completely in until they make contact with the PDM faceplate.
7. Tighten the two captive screws on the locking levers of the PDM faceplate to secure the PDM in the chassis.
8. Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the metal wiring compartment that protects the AC terminal block.
9. Remove the cover of the metal AC wiring compartment.
10. Unscrew the retaining nut from the AC power cord.
11. Place the retaining nut inside the metal wiring compartment.
12. Insert the wires of the AC power cord through the hole of the retaining nut and rubber grommet.
13. Insert the wires of the AC power cord through the hole of the metal wiring compartment.
14. Connect the wires to the AC terminal block on the three-phase wye AC PDM (see Figure 23). Loosen each of the input terminals or grounding point screws, insert the wire into the grounding point or input terminal, and tighten the screw (see Table 3 for approved AC wire gauge).

    To insert wires into the terminal block that serves six PSMs:

    1. Insert the grounding wire into the grounding point labeled GND.

    2. Insert the wire labeled L1 into the input terminal labeled A1.

    3. Insert the wire labeled L2 into the input terminal labeled B1.

    4. Insert the wire labeled L3 into the input terminal labeled C1.

    5. Insert the wire labeled N into the input terminal labeled N1.

    Figure 23: Connecting Power to a Three-Phase Wye AC Power Distribution Module

    

    Note

    The three-phase wye AC PDM terminal blocks will be flipped depending on which slot the PDM gets plugged into.

    Note

    The color of each AC power wire might vary. The MX2000 chassis is not sensitive to phase rotation sequence—either CW or CCW will operate correctly.

    Caution

    Wire label configuration is for Juniper Networks supplied cable only. If using your own cable, make sure you use the proper connections.

    To insert wires into the terminal block that serves three PSMs:

    1. Insert the grounding wire into the grounding point labeled GND.

    2. Insert the wire labeled L1 into the input terminal labeled A2.

    3. Insert the wire labeled L2 into the input terminal labeled B2.

    4. Insert the wire labeled L3 into the input terminal labeled C2.

    5. Insert the wire labeled N into the input terminal labeled N2.

    Warning

    To protect power supplies from input voltage that might be caused by mis-wired PDMs, before reinstalling the metal cover to the wiring compartment, apply AC voltage to the PDM (with disengaged PSM) to make sure that two LEDs on the PDM are lit green and that the AC voltage between AC terminal blocks A1-N1, B1-N1, C1-N1, A2-N2, B2-N2, and C2-N2 for three-phase wye PDM is not more than 264 VAC when measured with a digital voltage meter (DVM). Then turn off the AC breaker de-energizing the PDM and install the metal cover and engage all AC PSMs.

    Note

    The terminal connections have either slotted screws or hex screws. Use a 1/4-in. slotted screwdriver for the slotted screws. Use a 5/32-in. (4 mm) Allen wrench for the 5/16-in. hex screws.

    Note

    Three-phase wye AC wire assembly kits can be purchased from Juniper Networks.

    Table 3: Supported Three-Phase Wye AC Wire Gauge

    Wire Gauge	Description
    5 x 10-AWG or equivalent	5 conductor wires, each wire is 10-AWG

    Note

    We recommend that you use the proper gauge wire in order for the cable clamps to hold the AC cables. Using smaller gauge wiring will result in the cable clamps not tightening properly.

    Warning

    Power connections must be performed by a licensed electrician only.

15. Verify that the power cord wire connections are correct.
16. Screw the retaining nut onto the AC power cord to secure it to the metal wiring compartment.
17. Reinstall the metal PDM wiring cover, and using a number 2 Phillips (+) screwdriver, tighten the four captive screws on the metal AC wiring compartment.
18. Verify that the AC power cord is not touching or blocking access to router components, and that it does not drape where people could trip on it.
19. Remove the ESD grounding strap from the ESD points on the chassis. Connect the strap to an approved site ESD grounding point. See the instructions for your site.
20. Connect the AC power cord plug to the power source.
21. Switch on the customer-site circuit breakers to provide voltage on the AC power cord.
22. Remove the ESD grounding strap from the approved site ESD grounding point. See the instructions for your site. Reconnect the strap to one of the ESD points on the chassis.
23. Verify that the LED on the PDM faceplate is lit steadily, indicating that the AC terminal block is receiving power.

Replacing an MX2008 Three-Phase Wye AC Power Cord

• Removing an MX2008 Three-Phase Wye AC Power Cord

• Installing an MX2008 Three-Phase Wye AC Power Cord

Removing an MX2008 Three-Phase Wye AC Power Cord

1. Switch off the customer-site circuit breakers to the PDM being removed. Make 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 installation 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 power switch on the PSM faceplate to the off (O) position.Note

   After powering off a PSM, wait at least 60 seconds before turning it back on.

4. Remove the ESD grounding strap from the ESD point on the chassis, and attach it to an approved site ESD grounding point. See the instructions for your site.
5. Disconnect the AC power cord (see Figure 24) from the power source.

   Figure 24: Three-Phase Wye AC Power Supply Cord

   

6. Remove the ESD grounding strap from the approved site ESD grounding point. See the instructions for your site. Reconnect the strap to one of the ESD points on the chassis.
7. Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the metal wiring compartment that protects the AC terminal block.
8. Remove the cover of the metal AC wiring compartment.
9. Disconnect the wires from the AC terminal block on the three-phase wye AC PDM (see Figure 25). Loosen each of the input terminals or grounding point screws, and remove each wire from the grounding point or input terminal.Note

   The terminal connections have either slotted screws or hex screws. Use a 1/4-in. slotted screwdriver for the slotted screws. Use a 5/32-in. (4 mm) Allen wrench for the 5/16-in. hex screws.

   To remove wires from the terminal block that serves six PSMs:

   1. Remove the wire labeled N from the input terminal labeled N1.

   2. Remove the wire labeled L3 from the input terminal labeled C1.

   3. Remove the wire labeled L2 from the input terminal labeled B1.

   4. Remove the wire labeled L1 from the input terminal labeled A1.

   5. Remove the grounding wire from the grounding point labeled GND.

   Figure 25: Disconnecting the Power Cord from a Three-Phase Wye AC Power Distribution Module

   

   To remove wires from the terminal block that serves three PSMs:

   1. Remove the wire labeled N from the input terminal labeled N2.

   2. Remove the wire labeled L3 from the input terminal labeled C2.

   3. Remove the wire labeled L2 from the input terminal labeled B2.

   4. Remove the wire labeled L1 from the input terminal labeled A2.

   5. Remove the grounding wire from the grounding point labeled GND.

   Note

   The three-phase wye AC PDM terminal blocks will be flipped depending on which slot the PDM gets plugged into.

10. Loosen the plastic cable tie fastening the AC power cord to the PDM.
11. Loosen and remove the retaining nut from the AC power cord.
12. Pull the AC power cord out of the metal wiring compartment.
13. Carefully move the AC power cable out of the way.
14. Disconnect the AC power cord from the AC PDM.

Installing an MX2008 Three-Phase Wye AC Power Cord

1. Switch off the customer-site circuit breakers to the PDM being removed. Make 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 installation 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 all the power switches on the PSM faceplates to the off (O) position.Note

   After powering off a PSM, wait at least 60 seconds before turning it back on.

4. Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the metal wiring compartment that protects the AC terminal block.
5. Remove the cover of the metal AC wiring compartment.
6. Unscrew the retaining nut from the AC power cord.
7. Place the retaining nut inside the metal wiring compartment.
8. Insert the wires of the AC power cord through the hole of the metal wiring compartment.
9. Screw the retaining nut onto the AC power cord to secure it to the metal wiring compartment.
10. Connect the wires to the AC terminal block on the three-phase delta AC PDM (see Figure 26). Loosen each of the input terminal or grounding point screws, insert the wire into the grounding point or input terminal, and tighten the screw (see Table 4 for approved AC wire gauge).

    To insert wires into the terminal block that serves six PSMs:

    1. Insert the grounding wire into the grounding point labeled GND.

    2. Insert the wire labeled L1 into the input terminal labeled A1.

    3. Insert the wire labeled L2 into the input terminal labeled B1.

    4. Insert the wire labeled L3 into the input terminal labeled C1.

    5. Insert the wire labeled N into the input terminal labeled N1.

    Figure 26: Connecting Power to a Three-Phase Wye AC Power Distribution Module

    

    Note

    The three-phase wye AC PDM terminal blocks will be flipped depending on which slot the PDM gets plugged into.

    Note

    The color of each AC power wire might vary. The MX2008 chassis is not sensitive to phase rotation sequence—either CW or CCW will operate correctly.

    Caution

    Wire label configuration is for Juniper Networks supplied cable only. If using your own cable, make sure you use the proper connections.

    To insert wires into the terminal block that serves three PSMs:

    1. Insert the grounding wire into the grounding point labeled GND.

    2. Insert the wire labeled L1 into the input terminal labeled A2.

    3. Insert the wire labeled L2 into the input terminal labeled B2.

    4. Insert the wire labeled L3 into the input terminal labeled C2.

    5. Insert the wire labeled N into the input terminal labeled N2.

    Note

    The terminal connections have either slotted screws or hex screws. Use a 1/4-in. slotted screwdriver for the slotted screws. Use a 5/32-in. (4 mm) Allen wrench for the 5/16-in. hex screws.

    Warning

    To protect power supplies from input voltage that might be caused by mis-wired PDMs, before reinstalling the metal cover to the wiring compartment, apply AC voltage to the PDM (with disengaged PSM) to make sure that two LEDs on the PDM are lit green and that the AC voltage between AC terminal blocks A1-N1, B1-N1, C1-N1, A2-N2, B2-N2, and C2-N2 for three-phase wye PDM is not more than 264 VAC when measured with a digital voltage meter (DVM). Then turn off the AC breaker, de-energizing the PDM, and install the metal cover and engage all AC PSMs.

    Note

    Three-phase wye AC wire assembly kits can be purchased from Juniper Networks.

    Table 4: Supported Three-Phase Wye AC Wire Gauge

    Wire Gauge	Description
    5 x 10-AWG or equivalent	5 conductor wires, each wire is 10-AWG

    Note

    We recommend that you use the proper gauge wire in order for the cable clamps to hold the AC cables. Using smaller gauge wiring will result in the cable clamps not tightening properly.

    Warning

    Power connections must be performed by a licensed electrician only.

11. Verify that the power cord wire connections are correct.
12. Reinstall the metal PDM wiring cover, and using a number 2 Phillips (+) screwdriver, tighten the four captive screws on the metal AC wiring compartment.
13. Verify that the AC power cord does not touch or block access to router components, and that it does not drape where people could trip on it.
14. Remove the ESD grounding strap from the ESD points on the chassis. Connect the strap to an approved site ESD ground point. See the instructions for your site.
15. Connect the AC power cord plug to the power source.
16. Switch on the customer-site circuit breakers to provide voltage to the AC power cord.
17. Remove the ESD grounding strap from the approved site ESD grounding point. See the instructions for your site. Reconnect the strap to one of the ESD points on the chassis.
18. Verify the LED on the PDM faceplate is lit steadily, indicating that the AC terminal block is receiving power.
19. Switch the power switch on the PSM to the on (|) position to provide power to the router components.Note

    After a PDM is powered on, it can take up to 60 seconds for status indicators—such as the LEDs on the PDM, the command output displays, and messages on the LED display on the craft interface—to indicate that the PDM is functioning normally. Ignore error indicators that appear during the first 60 seconds.

Replacing an MX2008 DC Power Supply Module (-48 V)

• Removing an MX2008 DC Power Supply Module (-48 V)

• Installing an MX2008 DC Power Supply Module (-48 V)

Removing an MX2008 DC Power Supply Module (-48 V)

Before you remove a PSM, be aware of the following:

1. With one PSM installed and operational, remove any additional PSM by turning the power switch to the off (O) position.
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. Loosen the two captive screws on the PSM faceplate.
4. While grasping the handle on the PSM faceplate with one hand, use your other hand to guide the PSM away from the chassis.
5. Pull the PSM straight out of the chassis.Warning

   Do not touch the power connectors on back of the PSM. They can get damaged.

6. Place the PSM module into an antistatic bag.Note

   Each PSM slot not occupied by a DC PSM must be covered by a PSM blank panel.

Figure 27: Removing a DC Power Supply Module (-48 V) from the MX2008 Router

Installing an MX2008 DC Power Supply Module (-48 V)

1. With one PSM installed and operational, install an additional PSM with the power supply switch in the off (O) or in the on (|) position.Caution

   If there is only one PSM installed and operational, the power supply switch must be placed in the off (O) position.

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. While grasping the handle on the PSM faceplate with one hand, use your other hand to guide the power supply module into the chassis.
4. Tighten the captive screws on the PSM faceplate.
5. Turn on the power switch to the on (|) position.
6. Verify that the PWR OK LED is lit steadily green.

Figure 28: Installing a DC Power Supply Module

Replacing an MX2008 DC Power Distribution Module Cable (-48 V)

• Disconnecting an MX2008 DC Power Distribution Module Cable

• Connecting an MX2008 DC Power Distribution Module Cable (-48 V)

Disconnecting an MX2008 DC Power Distribution Module Cable

1. Switch off the dedicated customer-site circuit breaker for the PDM being removed. Follow your site's procedures for ESD.
2. 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.
3. Verify that the –48V LED on the PDM is not lit.
4. Remove the power cable from the external DC power source.
5. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
6. Remove the clear plastic cover protecting the terminal studs on the faceplate.
7. Remove the nut and washers from each of the terminal studs. (Use a 7/16-in. [11 mm] nut driver or socket wrench.)
8. Remove the cable lug from the terminal studs.
9. Carefully move the power cable out of the way.
10. Replace the clear plastic cover protecting the terminal studs on the faceplate.

Connecting an MX2008 DC Power Distribution Module Cable (-48 V)

1. Locate a replacement power cable that meets the specifications defined in MX2008 DC Power (-48 V) System Electrical Specifications.
2. Verify that a licensed electrician has attached a cable lug to the replacement power cable.
3. Verify that the –48V LED is off.
4. Secure the power cable lug to the terminal studs, first with the flat washer, then with the split washer, and finally with the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut (see Figure 29). Do not overtighten the nut. (Use a 7/16-in. [11 mm)] torque-controlled driver or socket wrench.)Caution

   Ensure that each power cable lug seats flush against the surface of the terminal block as you are tightening the nuts. Ensure that each nut is properly threaded onto the terminal stud. The nut should be able to spin freely with your fingers when it is first placed onto the terminal stud. Applying installation torque to the nut when the nut is improperly threaded might result in damage to the terminal stud.

   Caution

   The maximum torque rating of the terminal studs on the DC PDM is 25 lb-in. (33.89 Nm). The terminal studs might be damaged if excessive torque is applied. Use only a torque-controlled driver or socket wrench to tighten nuts on the DC PDM terminal studs.

   Figure 29: Connecting Power Cables to the DC Power Distribution Module

   

5. Route the positive and negative DC power cables through the plastic cable restraint cover. Make sure that the cable does not touch or obstruct any router components.
6. Verify that the DC power cable is connected correctly, that it does not touch or block access to router components, and that it does not drape where people could trip on it.
7. Attach the power cable to the DC power source.
8. Turn on the dedicated customer-site circuit breaker to the PDM.
9. Verify that the –48V LED on the PDM is lit steadily.
10. On each of the DC power input sources, switch the DC circuit breaker to the center position before moving it to the ON position. Note

    The circuit breaker might bounce back to the OFF position if you move the breaker too quickly.

    Observe the status LEDs on the PDM faceplate. If the PDM is correctly installed and functioning normally, the –48V LEDs light green steadily.

Replacing an MX2000 DC Power Supply Module (240 V China)

1. Removing an MX2000 Router DC Power Supply Module (240 V China)

2. Installing an MX2000 Router DC Power Supply Module (240 V China)

Removing an MX2000 Router DC Power Supply Module (240 V China)

Before you remove a PSM, be aware of the following:

1. With one PSM installed and operational, remove any additional PSM by turning the power switch to the off (O) position.
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. Loosen the two captive screws on the PSM faceplate. Apply between 10 lb-in. (1.13 Nm) to 12 lb-in. (1.35 Nm) of torque to each screw. Do not overtighten the screws.
4. While grasping the handle on the PSM faceplate with one hand, use your other hand to guide the PSM away from the chassis.
5. Pull the PSM straight out of the chassis.Warning

   To avoid damage, do not touch the power connectors in back of the PSM.

6. Place the PSM module into an antistatic bag.Note

   Each PSM slot not occupied by a DC PSM must be covered by a PSM blank panel.

Figure 30: Removing an MX2000 Router DC Power Supply Module (240 V China)

Installing an MX2000 Router DC Power Supply Module (240 V China)

1. With one PSM installed and operational, install an additional PSM with the power supply switch in the off (O) or in the on (|) position.Caution

   If there is only one PSM installed and operational, the power supply switch must be placed in the off (O) position.

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. While grasping the handle on the PSM faceplate with one hand, use your other hand to guide the power supply module into the chassis.
4. Tighten the captive screws on the PSM faceplate. Apply between 10 lb-in. (1.13 Nm) to 12 lb-in. (1.35 Nm) of torque to each screw. Do not overtighten the screws.
5. Turn on the power switch to the on (|) position.
6. Verify that the PWR OK LED is lit steadily green.

Figure 31: Installing a DC Power Supply Module (240 V China)

Replacing an MX2000 DC Power Distribution Module (240 V China)

1. Removing an MX2000 Router DC Power Distribution Module (240 V China)

2. Installing an MX2000 Router DC Power Distribution Module (240 V China)

3. Connecting an MX2000 DC Router Power Distribution Module (240 V China) Cable

Removing an MX2000 Router DC Power Distribution Module (240 V China)

Before you remove a PDM, be aware of the following:

1. Switch off the dedicated customer site circuit breaker for the PDM being removed. Follow your site's procedures for ESD.
2. 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.
3. Verify that the LEDs on the PDM to be removed are not lit.
4. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
5. Move the DC circuit breaker on the power input source to the OFF position.
6. Starting at one end of the PDM, unplug all the power cords. Press the latch on the side of the power cable before pulling it out. See Figure 32.

   Figure 32: Unplugging the 240 V China Power Cord an MX2000 Router

   

7. Loosen the two captive screws on the locking levers, and pull away from the chassis. See Figure 33.Note

   For the MX2020 Router, pull down the PDM3/Input1 and PDM1/Input1 locking levers to release the PDM from the chassis, and pull up the PDM0/Input0 and PDM2/Input0 locking levers to release the PDM from the chassis.

   Note

   For the MX2010 and MX2008 Routers, pull down the PDM1/Input1 locking levers to release the PDM from the chassis, and pull up the PDM0/Input0 locking levers to release the PDM from the chassis.

   Figure 33: Removing a DC PDM (240 V China) from an MX2000 Router

   

8. The PDM is extended slightly away from the chassis. See Figure 33.
9. With both hands, grasp the two handles and gently pull the PDM straight out of the chassis.Caution

   Do not touch the power connectors on the back of the PDM. It can get damaged.

   Note

   Each PDM slot not occupied by a DC PDM must be covered by a PDM blank panel.

10. Place the PDM onto an antistatic mat or into a ESD bag.

Installing an MX2000 Router DC Power Distribution Module (240 V China)

1. Ensure that the voltage across the DC power source cable leads is 0 V and that there is no chance that the cable leads 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. Move the DC circuit breaker on the power input source to the off position.
4. [Optional]—If you are switching from an AC PDM to DC PDM, see Converting an MX2000 Router Between AC and DC Power for instructions on how to change the setting on the internal bar of the power distribution unit (PDU) cage to DC.
5. Remove the blank panel covering the PDM slot in the chassis.
6. Open the locking levers on the PDM.
7. While holding both handles, guide the PDM until the locking levers are inserted into the chassis. With both hands push the locking levers simultaneously until the PDM is fully seated into the chassis (see Figure 34).

   Figure 34: Installing an MX2020 Router DC Power Distribution Module (240 V China)

   

8. Tighten both captive screws on the PDM. Apply between 10 lb-in. (1.13 Nm) to 12 lb-in. (1.35 Nm) of torque to each screw. Do not overtighten the screws.
9. Starting at one end of the PDM, plug the power cords into the power sockets on the PDM. Press the latch on the side of the power cable before pushing it in. Apply slight pressure so that the power cord is firmly seated in the power socket until you feel it engage. As you plug in each power cord, the power LED for the socket lights up green. See Figure 35.

   Figure 35: Plugging the 240 V China Power Cord an MX2000 Router

   

Connecting an MX2000 DC Router Power Distribution Module (240 V China) Cable

1. Switch off the dedicated customer site circuit breakers. Ensure that the voltage across the DC power source cable leads is 0 V and that there is no chance that the cable leads 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.Note

   If the DC PSMs (240 V China) are installed in the router, make sure the power switches on all PSMs are turned to the off (O) position.

3. Plug the power cord into the power sockets on the DC PDM (240 V China). Refer to Figure 1. Press the latch on the side of the power cable before pushing it in. Apply slight pressure so that the power cord is firmly seated in the power socket until you feel it engage. As you plug in each power cord, the power LED for the socket lights up green.

   Figure 36: Connecting Power

   

4. Connect the power cords for the remaining PDMs.
5. Connect the power cable (CBL-PWR-240V-CH) to the DC power source. See Figure 37.

   Figure 37: 240 V China Power Cable

   

   1 — Negative	3 — Positive
   2 — Ground

6. Switch on the dedicated customer site circuit breaker.
7. On each of the DC power input sources, switch the DC circuit breaker to the center position before moving it to the ON position.Note

   The circuit breaker may bounce back to the off position if you move the breaker too quickly.

8. Observe the status LEDs on the PDM faceplate. If the PDM is correctly installed and functioning normally, the LEDs light green steadily.
9. On each of the DC PSMs, move the switch to the on (|) position.

Replacing an MX2000 High-Voltage Second-Generation Universal (HVAC/HVDC) Power Supply Module

1. Removing an MX2000 Router High-Voltage Second-Generation Universal (HVAC/HVDC) Power Supply Module

2. Installing an MX2000 Router High-Voltage Universal (HVAC/HVDC) Power Supply Module

Removing an MX2000 Router High-Voltage Second-Generation Universal (HVAC/HVDC) Power Supply Module

Before you remove a PSM, be aware of the following:

1. With one PSM installed and operational, remove any additional PSM by turning the power switch to the off (O) position.
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. Loosen the two captive screws on the PSM faceplate. Apply between 10 lb-in. (1.13 Nm) to 12 lb-in. (1.35 Nm) of torque to each screw. Do not overtighten the screws.
4. While grasping the handle on the PSM faceplate with one hand, use your other hand to guide the PSM away from the chassis.
5. Pull the PSM straight out of the chassis.Warning

   To avoid damage, do not touch the power connectors in back of the PSM.

6. Place the PSM module into an antistatic bag.Note

   Each PSM slot not occupied by a universal (HVAC/HVDC) PSM must be covered by a PSM blank panel.

Figure 38: Removing an MX2020 Router Universal (HVAC/HVDC) Power Supply Module

Figure 39: Removing an MX2010 Router Universal (HVAC/HVDC) Power Supply Module

Figure 40: Removing an MX2008 Router Universal (HVAC/HVDC) Power Supply Module

Installing an MX2000 Router High-Voltage Universal (HVAC/HVDC) Power Supply Module

1. With one PSM installed and operational, install an additional PSM with the power supply switch in the off (O) or in the on (|) position.Caution

   If there is only one PSM installed and operational, the power supply switch must be placed in the off (O) position.

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. While grasping the handle on the PSM faceplate with one hand, use your other hand to guide the power supply module into the chassis.
4. Tighten the captive screws on the PSM faceplate. Apply between 10 lb-in. (1.13 Nm) to 12 lb-in. (1.35 Nm) of torque to each screw. Do not overtighten the screws.
5. Turn on the power switch to the on (|) position.
6. Verify that the PWR OK LED is lit steadily green.

Figure 41: Installing an MX2020 Router Universal (HVAC/HVDC) Power Supply Module

Figure 42: Installing an MX2010 Router Universal (HVAC/HVDC) Power Supply Module

Figure 43: Installing an MX2008 Router Universal (HVAC/HVDC) Power Supply Module

Replacing an MX2000 High-Voltage Universal (HVAC/HVDC) Power Distribution Module

1. Installing an MX2000 Router High-Voltage Universal (HVAC/HVDC) Power Distribution Module

2. Removing an MX2000 Router High-Voltage Second Generation Universal (HVAC/HVDC) Power Distribution Module

Installing an MX2000 Router High-Voltage Universal (HVAC/HVDC) Power Distribution Module

1. Ensure that the voltage across the DC power source cable leads is 0 V and that there is no chance that the cable leads 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. Move the DC circuit breaker on the power input source to the off position.
4. [Optional]—If you are switching from an AC PDM or 48V DC PDM to a universal PDM, the universal HVAC/HVDC PSMs and PDMs work with either AC or DC bar setting, see Converting an MX2000 Router Between AC and DC Power for details.
5. Remove the blank panel covering the PDM slot in the chassis.
6. Open the locking levers on the PDM.
7. While holding both handles, guide the PDM until the locking levers are inserted into the chassis. With both hands push the locking levers simultaneously until the PDM is fully seated into the chassis (see Figure 44).

   Figure 44: Installing an MX2000 Router Universal (HVAC/HVDC) Power Distribution Module

   

8. Tighten both captive screws on the PDM. Apply between 10 lb-in. (1.13 Nm) to 12 lb-in. (1.35 Nm) of torque to each screw. Do not overtighten the screws.
9. Starting at one end of the PDM, plug the power cords into the power sockets on the PDM. Press the latch on the side of the power cable before pushing it in. Apply slight pressure so that the power cord is firmly seated in the power socket until you feel it engage. As you plug in each power cord, the power LED for the socket lights up green. See Figure 45.

   Figure 45: Plugging the Universal (HVAC/HVDC) Power Cord an MX2000 Router

   

Removing an MX2000 Router High-Voltage Second Generation Universal (HVAC/HVDC) Power Distribution Module

Before you remove a PDM, be aware of the following:

Depending on whether you are connecting to AC or DC power, these warnings apply to the universal HVAC/HVDC power distribution module (PDM):

1. Switch off the dedicated customer site circuit breaker for the PDM being removed. Follow your site's procedures for ESD.
2. 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.
3. Verify that the LEDs on the PDM to be removed are not lit.
4. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
5. Move the AC or DC circuit breaker on the power input source to the OFF position.
6. Starting at one end of the PDM, unplug all the power cords. Press the latch on the side of the power cable before pulling it out. See Figure 46.

   Figure 46: Unplugging the Universal HVAC/HVDC Power Cord an MX2000 Router

   

7. Loosen the two captive screws on the locking levers, and pull away from the chassis. See .Note

   For the MX2020 Router, pull down the PDM3/Input1 and PDM1/Input1 locking levers to release the PDM from the chassis, and pull up the PDM0/Input0 and PDM2/Input0 locking levers to release the PDM from the chassis.

   Note

   For the MX2010 and MX2008 Routers, pull down the PDM1/Input1 locking levers to release the PDM from the chassis, and pull up the PDM0/Input0 locking levers to release the PDM from the chassis.

   Figure 47: Removing a Universal (HVAC/HVDC) PDM from an MX2020 Router

   

   Figure 48: Removing a Universal (HVAC/HVDC) PDM from an MX2010 Router

   

   Figure 49: Removing a Universal (HVAC/HVDC) PDM from an MX2008 Router

   

8. The PDM is extended slightly away from the chassis. See Figure 47, Figure 48, and Figure 49.
9. With both hands, grasp the two handles and gently pull the PDM straight out of the chassis.Caution

   Do not touch the power connectors on the back of the PDM. It can get damaged.

   Note

   Each PDM slot not occupied by a PDM must be covered by a PDM blank panel.

10. Place the PDM onto an antistatic mat or into a ESD bag.