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Replacing an MX2000 Three-Phase Delta AC Power Distribution Module
Replacing an MX2020 Three-Phase Wye AC Power Distribution Module
Replacing an MX2008 DC Power Distribution Module Cable (-48 V)
Replacing an MX2000 DC Power Distribution Module (240 V China)
Replacing an MX2000 High-Voltage Second-Generation Universal (HVAC/HVDC) Power Supply Module
Replacing an MX2000 High-Voltage Universal (HVAC/HVDC) Power Distribution Module
Maintaining MX2008 Power System Components
Replacing an MX2008 AC Power Supply Module
Removing an MX2008 AC Power Supply Module
Before you remove a PSM, be aware of the following:
To maintain proper cooling and prevent thermal shutdown of the operating PSM, each PSM slot must contain either a PSM or a blank panel. If you remove a PSM, you must install a replacement PSM or a blank panel shortly after the removal.
After powering off a PSM, wait at least 60 seconds before turning it back on.
To remove an AC PSM (see Figure 1):
The minimum number of AC PSMs changes based on the configuration.
- With one PSM installed and operational, remove any additional
PSM by turning the power switch to the off (
O
) position. - Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- Loosen the two captive screws on the PSM faceplate.
- While grasping the handle on the PSM faceplate with one hand, use your other hand to guide the PSM away from the chassis.
- Pull the PSM straight out of the chassis.
Caution Do not touch the power connectors on back of the PSM. They can get damaged.
- 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.

Installing an MX2008 AC Power Supply Module
Before you install a PSM, be aware of the following:
The AC PSM is hot-swappable when a minimum number of PSMs installed and operational.
The AC PSMs have no circuit breakers that can physically disconnect AC line from the router. After AC feeds have been connected to the PDM, the AC voltage is always present on the power midplane and is distributed to the PSM connectors on the power midplane.
To maintain proper cooling and prevent thermal shutdown of the operating PSM, each PSM slot must contain either a PSM or a blank panel. If you remove a PSM, you must install a replacement PSM or a blank panel shortly after the removal.
After powering on a PSM, wait at least 60 seconds before turning it back off.
To install an AC PSM (see Figure 2):
- 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. - Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- While grasping the handle on the PSM faceplate with one hand, use your other hand to guide the power supply module into the chassis.
- Tighten the captive screws on the PSM faceplate.
- Turn on the power switch to the on (
|
) position. - Verify that the
PWR OK
LED is lit steadily green.

See also
Replacing an MX2000 Three-Phase Delta AC Power Distribution Module
Removing an MX2000 Three-Phase Delta AC Power Distribution Module
Installing an MX2000 Router Three-Phase Delta AC Power Distribution Module
Removing an MX2000 Three-Phase Delta AC Power Distribution Module
The MX2008, MX2010, and MX2020 routers support the same power modules (AC/DC PSMs and AC/DC PDMs).
Before you remove a three-phase delta AC PDM, be aware of the following:
Before performing AC power procedures, disconnect all
power sources. To ensure that all power is OFF
, locate the circuit breaker on the panel board that services the
AC circuit, switch the circuit breaker to the OFF
position, and tape the switch handle of the circuit breaker in the OFF
position.
Do not touch the power connectors on the PDM. They can contain dangerous voltages.
To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each PDM slot must contain either a PDM or a blank panel. If you remove a PDM, you must install a replacement PDM or a blank panel shortly after the removal.
After powering off a PDM, wait at least 60 seconds before
turning the circuit breaker to the ON
position.
To remove a three-phase delta AC PDM:
- 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.
- 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.
- Disconnect the AC power cord (see Figure 3) from the power source.
Figure 3: Three-Phase Delta AC Power Cord - 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.
- Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the metal wiring compartment that protects the AC terminal block.
- Remove the cover of the metal AC wiring compartment.
- 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:
Remove the wire labeled
L3
from the input terminal labeledC1
.Remove the wire labeled
L2
from the input terminal labeledB1
.Remove the wire labeled
L1
from the input terminal labeledA1
.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:
Remove the wire labeled
L3
from the input terminal labeledC2
.Remove the wire labeled
L2
from the input terminal labeledB2
.Remove the wire labeled
L1
from the input terminal labeledA2
.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.
- Loosen the plastic cable tie fastening the AC power cord to the PDM.
- Loosen and remove the retaining nut from the AC power cord.
- Pull the AC power cord out of the metal wiring compartment.
- Carefully move the AC power cable out of the way.
- Disconnect both of the AC power cords from the AC PDM.
- Loosen the two captive screws on the locking levers of the PDM faceplate completely.
- Pull the locking levers on either side of the faceplate up to unseat the PDM.
- 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.
- Place one hand underneath the PDM to support it, and slide it completely out of the chassis.



Each PDM slot not occupied by a AC PDM must be covered by a PDM blank panel.
See also
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:
Before performing AC power procedures, disconnect all power sources. To ensure that all power is off, locate the circuit breaker on the panel board that services the AC circuit, switch the circuit breaker to the off position, and tape the switch handle of the circuit breaker in the off position.
To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each PDM slot must contain either a PDM or a blank panel. If you remove a PDM, you must install a replacement PDM or a blank panel shortly after the removal.
After powering off a PDM, wait at least 60 seconds before turning the circuit breaker back on.
The PDMs are hot swappable in a redundant configuration. However, you cannot switch from one type of PDM (AC or DC) to another while the system is on.
Each three-phase delta AC PDM weighs approximately 12 lb (5.44 kg). To install a three-phase delta AC PDM:
- 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.
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- [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.
- Pull the locking levers on either side of the faceplate away until they stop.
- Using both hands, slide the PDM into the chassis until you feel resistance (see Figure 8Figure 9, and Figure 10).
- Push the lock levers until they make contact with the PDM faceplate.
- 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.
- 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) - Remove the cover of the metal AC wiring compartment.
- Unscrew the retaining nut from the AC power cord.
- Place the retaining nut inside the metal wiring compartment.
- Insert the wires of the AC power cord through the hole of the retaining nut and rubber grommet.
- Insert the wires of the AC power cord through the hole of the metal wiring compartment.
- 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:
Insert the grounding wire into the grounding point labeled
GND
.Insert the wire labeled
L1
into the input terminal labeledA1
.Insert the wire labeled
L2
into the input terminal labeledB1
.Insert the wire labeled
L3
into the input terminal labeledC1
.
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:
Insert the grounding wire into the grounding point labeled
GND
.Insert the wire labeled
L1
into the input terminal labeledA2
.Insert the wire labeled
L2
into the input terminal labeledB2
.Insert the wire labeled
L3
into the input terminal labeledC2
.
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.
- Verify that the power cord wire connections are correct.
- Screw the retaining nut onto the AC power cord to secure it to the metal wiring compartment.
- Using a number 2 Phillips (+) screwdriver, tighten the four captive screws on the metal AC wiring compartment.
- 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.
- 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.
- Connect the AC power cord plug to the power source.
- Switch on the customer-site circuit breakers to provide voltage on the AC power cord.
- 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.
- Verify that the LED on the PDM faceplate is lit steadily, indicating that the AC terminal block is receiving power.
See also
Replacing an MX2008 Three-Phase Delta AC Power Cord
The MX2008 router has either one redundant PDM or two redundant PDMs. An AC power cord on a redundant PDM is hot-insertable and hot-removable. When a redundant PDM is powered down, the other PDM automatically assumes the entire electrical load for the router. If you have only one PDM, you must power off the system before removing the AC power cord.
Removing an MX2008 Three-Phase Delta AC Power Cord
To remove a three-phase delta AC power cord:
- 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.
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- 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.
- 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.
- Disconnect the AC power cord (see Figure 12) from the power source.
Figure 12: Three-Phase Delta AC Power Cord - 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.
- Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the metal wiring compartment that protects the AC terminal block.
- Remove the cover of the metal wiring compartment.
- 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:
Remove the wire labeled
L3
from the input terminal labeledC1
.Remove the wire labeled
L2
from the input terminal labeledB1
.Remove the wire labeled
L1
from the input terminal labeledA1
.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:
Remove the wire labeled
L3
from the input terminal labeledC2
.Remove the wire labeled
L2
from the input terminal labeledB2
.Remove the wire labeled
L1
from the input terminal labeledA2
.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.
- Loosen the plastic cable tie fastening the AC power cord to the PDM.
- Loosen and remove the retaining nut from the AC power cord.
- Pull the AC power cord out of the metal wiring compartment.
- Carefully move the AC power cable out of the way.
- Disconnect the AC power cord from the AC PDM.
Installing an MX2008 Three-Phase Delta AC Power Cord
To install a three-phase delta AC power cord:
- 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.
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- 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.
- Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the metal wiring compartment that protects the AC terminal block.
- Remove the cover of the metal AC wiring compartment.
- Unscrew the retaining nut from the AC power cord.
- Place the retaining nut inside the metal wiring compartment.
- Insert the wires of the AC power cord through the hole of the retaining nut and rubber grommet.
- Insert the wires of the AC power cord through the hole of the metal wiring compartment.
- 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:
Insert the grounding wire into the grounding point labeled
GND
.Insert the wire labeled
L1
into the input terminal labeledA1
.Insert the wire labeled
L2
into the input terminal labeledB1
.Insert the wire labeled
L3
into the input terminal labeledC1
.
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:
Insert the grounding wire into the grounding point labeled
GND
.Insert the wire labeled
L1
into the input terminal labeledA2
.Insert the wire labeled
L2
into the input terminal labeledB2
.Insert the wire labeled
L3
into the input terminal labeledC2
.
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.
- Verify that the power cord wire connections are correct.
- Screw the retaining nut onto the AC power cord to secure it to the metal wiring compartment.
- Using a number 2 Phillips (+) screwdriver, tighten the four captive screws on the metal AC wiring compartment.
- 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.
- 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.
- Connect the AC power cord plug to the power source.
- Switch on the customer-site circuit breakers to provide voltage to the AC power cord.
- 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.
- Verify the LED on the PDM faceplate is lit steadily, indicating that the AC terminal block is receiving power.
- 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.
See also
MX2000 Three-Phase Delta AC Power Distribution Module Description
Replacing an MX2000 Three-Phase Delta AC Power Distribution Module
MX2000 Three-Phase Delta AC Power Distribution Module Electrical Specifications
Preventing Electrostatic Discharge Damage to an MX2008 RouterPreventing Electrostatic Discharge Damage to an MX2008 RouterPreventing Electrostatic Discharge Damage to an MX2008 Router
Replacing an MX2020 Three-Phase Wye AC Power Distribution Module
Removing an MX2000 Three-Phase Wye AC Power Distribution Module
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:
Before performing AC power procedures, disconnect all
power sources. To ensure that all power is off, locate the circuit
breaker on the panel board that services the AC circuit, move the
circuit breaker to the OFF
position, and tape
the switch handle of the circuit breaker in the OFF
position.
Do not touch the power connectors on the PDM. They can contain dangerous voltages.
To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each PDM slot must contain either a PDM or a blank panel. If you remove a PDM, you must install a replacement PDM or a blank panel shortly after the removal.
After powering off a PDM, wait at least 60 seconds before turning the circuit breaker back on.
To remove a three-phase wye AC PDM:
- 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.
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- 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.
- Disconnect the AC power cord (see Figure 15) from the power source.
Figure 15: Three-Phase Wye AC Power Cord - 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.
- Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the metal wiring compartment that protects the AC terminal block.
- Remove the cover of the metal AC wiring compartment.
- 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:
Remove the wire labeled
N
from the input terminal labeledN1
.Remove the wire labeled
L3
from the input terminal labeledC1
.Remove the wire labeled
L2
from the input terminal labeledB1
.Remove the wire labeled
L1
from the input terminal labeledA1
.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:
Remove the wire labeled
N
from the input terminal labeledN2
.Remove the wire labeled
L3
from the input terminal labeledC2
.Remove the wire labeled
L2
from the input terminal labeledB2
.Remove the wire labeled
L1
from the input terminal labeledA2
.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.
- Loosen the plastic cable tie fastening the AC power cord to the PDM.
- Loosen and remove the retaining nut from the AC power cord.
- Pull the AC power cord out of the metal wiring compartment.
- Carefully move the AC power cable out of the way.
- Disconnect the AC power cord from the AC PDM.
- Loosen the two captive screws on the locking levers of the PDM faceplate completely.
- Pull the locking levers on either side of the faceplate up to unseat the PDM.
- 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.
- Place one hand underneath the PDM to support it, and slide it completely out of the chassis.



Each PDM slot not occupied by a AC PDM must be covered by a PDM blank panel.
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:
Before performing AC power procedures, ensure that power is removed from the AC circuit. To ensure that all power is off, locate the circuit breaker on the panel board that services the AC circuit, switch the circuit breaker to the off position, and tape the switch handle of the circuit breaker in the off position.
To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each PDM slot must contain either a PDM or a blank panel. If you remove a PDM, you must install a replacement PDM or a blank panel shortly after the removal.
After powering off a PDM, wait at least 60 seconds before turning the circuit breaker back on.
The PDMs are hot swappable in a redundant configuration. However, you cannot convert to a DC configuration while the system is on.
- 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.
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- [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.
- Pull the locking levers on either side of the faceplate away until they stop.
- 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) - Push the lock levers completely in until they make contact with the PDM faceplate.
- Tighten the two captive screws on the locking levers of the PDM faceplate to secure the PDM in the chassis.
- Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the metal wiring compartment that protects the AC terminal block.
- Remove the cover of the metal AC wiring compartment.
- Unscrew the retaining nut from the AC power cord.
- Place the retaining nut inside the metal wiring compartment.
- Insert the wires of the AC power cord through the hole of the retaining nut and rubber grommet.
- Insert the wires of the AC power cord through the hole of the metal wiring compartment.
- 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:
Insert the grounding wire into the grounding point labeled
GND
.Insert the wire labeled
L1
into the input terminal labeledA1
.Insert the wire labeled
L2
into the input terminal labeledB1
.Insert the wire labeled
L3
into the input terminal labeledC1
.Insert the wire labeled
N
into the input terminal labeledN1
.
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:
Insert the grounding wire into the grounding point labeled
GND
.Insert the wire labeled
L1
into the input terminal labeledA2
.Insert the wire labeled
L2
into the input terminal labeledB2
.Insert the wire labeled
L3
into the input terminal labeledC2
.Insert the wire labeled
N
into the input terminal labeledN2
.
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.
- Verify that the power cord wire connections are correct.
- Screw the retaining nut onto the AC power cord to secure it to the metal wiring compartment.
- Reinstall the metal PDM wiring cover, and using a number 2 Phillips (+) screwdriver, tighten the four captive screws on the metal AC wiring compartment.
- 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.
- 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.
- Connect the AC power cord plug to the power source.
- Switch on the customer-site circuit breakers to provide voltage on the AC power cord.
- 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.
- Verify that the LED on the PDM faceplate is lit steadily, indicating that the AC terminal block is receiving power.
See also
Replacing an MX2008 Three-Phase Wye AC Power Cord
The MX2008 router has either one redundant PDM or two redundant PDMs. An AC power supply cord on a redundant PDM is hot-insertable and hot-removable. When a redundant PDM is powered down, the other PDM automatically assumes the entire electrical load for the router. If you have only one PDM, you must power off the system before removing the AC power supply cord.
Removing an MX2008 Three-Phase Wye AC Power Cord
To remove a three-phase wye AC power cord:
- 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.
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- 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.
- 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.
- Disconnect the AC power cord (see Figure 24) from the
power source.
Figure 24: Three-Phase Wye AC Power Supply Cord - 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.
- Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the metal wiring compartment that protects the AC terminal block.
- Remove the cover of the metal AC wiring compartment.
- 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:
Remove the wire labeled
N
from the input terminal labeledN1
.Remove the wire labeled
L3
from the input terminal labeledC1
.Remove the wire labeled
L2
from the input terminal labeledB1
.Remove the wire labeled
L1
from the input terminal labeledA1
.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:
Remove the wire labeled
N
from the input terminal labeledN2
.Remove the wire labeled
L3
from the input terminal labeledC2
.Remove the wire labeled
L2
from the input terminal labeledB2
.Remove the wire labeled
L1
from the input terminal labeledA2
.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.
- Loosen the plastic cable tie fastening the AC power cord to the PDM.
- Loosen and remove the retaining nut from the AC power cord.
- Pull the AC power cord out of the metal wiring compartment.
- Carefully move the AC power cable out of the way.
- Disconnect the AC power cord from the AC PDM.
Installing an MX2008 Three-Phase Wye AC Power Cord
To install a three-phase wye AC power cord:
- 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.
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- 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.
- Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the metal wiring compartment that protects the AC terminal block.
- Remove the cover of the metal AC wiring compartment.
- Unscrew the retaining nut from the AC power cord.
- Place the retaining nut inside the metal wiring compartment.
- Insert the wires of the AC power cord through the hole of the metal wiring compartment.
- Screw the retaining nut onto the AC power cord to secure it to the metal wiring compartment.
- 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:
Insert the grounding wire into the grounding point labeled
GND
.Insert the wire labeled
L1
into the input terminal labeledA1
.Insert the wire labeled
L2
into the input terminal labeledB1
.Insert the wire labeled
L3
into the input terminal labeledC1
.Insert the wire labeled
N
into the input terminal labeledN1
.
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:
Insert the grounding wire into the grounding point labeled
GND
.Insert the wire labeled
L1
into the input terminal labeledA2
.Insert the wire labeled
L2
into the input terminal labeledB2
.Insert the wire labeled
L3
into the input terminal labeledC2
.Insert the wire labeled
N
into the input terminal labeledN2
.
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.
- Verify that the power cord wire connections are correct.
- Reinstall the metal PDM wiring cover, and using a number 2 Phillips (+) screwdriver, tighten the four captive screws on the metal AC wiring compartment.
- 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.
- 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.
- Connect the AC power cord plug to the power source.
- Switch on the customer-site circuit breakers to provide voltage to the AC power cord.
- 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.
- Verify the LED on the PDM faceplate is lit steadily, indicating that the AC terminal block is receiving power.
- 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.
See also
Replacing 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:
To maintain proper cooling and prevent thermal shutdown of the operating PSM, each PSM slot must contain either a PSM or a blank panel. If you remove a PSM, you must install a replacement PSM or a blank panel shortly after the removal.
After powering off a PSM, wait at least 60 seconds before turning it back on.
To remove a DC PSM (see Figure 27):
The DC PSM is hot-swappable, with a minimum number of PSMs installed.
- With one PSM installed and operational, remove any additional
PSM by turning the power switch to the off (
O
) position. - Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- Loosen the two captive screws on the PSM faceplate.
- While grasping the handle on the PSM faceplate with one hand, use your other hand to guide the PSM away from the chassis.
- Pull the PSM straight out of the chassis.
Warning Do not touch the power connectors on back of the PSM. They can get damaged.
- 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.

Installing an MX2008 DC Power Supply Module (-48 V)
Before you install a PSM, be aware of the following:
The DC PSM is hot-swappable when a minimum number of PSMs installed and operational.
The DC PSMs have no circuit breakers that can physically disconnect DC line from the router. After DC feeds have been connected to the PDM, the DC voltage is always present on the power midplane and is distributed to the PSM connectors on the power midplane.
To maintain proper cooling and prevent thermal shutdown of the operating PSM, each PSM slot must contain either a PSM or a blank panel. If you remove a PSM, you must install a replacement PSM or a blank panel shortly after the removal.
After powering on a PSM, wait at least 60 seconds before turning it back off.
To install a DC PSM (see Figure 28):
- 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. - Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- While grasping the handle on the PSM faceplate with one hand, use your other hand to guide the power supply module into the chassis.
- Tighten the captive screws on the PSM faceplate.
- Turn on the power switch to the on (
|
) position. - Verify that the
PWR OK
LED is lit steadily green.

See also
Replacing an MX2008 DC Power Distribution Module Cable (-48 V)
Disconnecting an MX2008 DC Power Distribution Module Cable
Before performing DC power procedures, disconnect all
power sources. To ensure that all power is off, locate the circuit
breaker on the panel board that services the DC circuit, switch the
circuit breaker to the OFF
position, and tape
the switch handle of the circuit breaker in the OFF
position.
To disconnect a power cable for a DC PDM:
- Switch off the dedicated customer-site circuit breaker for the PDM being removed. Follow your site's procedures for ESD.
- 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.
- Verify that the
–48V
LED on the PDM is not lit. - Remove the power cable from the external DC power source.
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- Remove the clear plastic cover protecting the terminal studs on the faceplate.
- Remove the nut and washers from each of the terminal studs. (Use a 7/16-in. [11 mm] nut driver or socket wrench.)
- Remove the cable lug from the terminal studs.
- Carefully move the power cable out of the way.
- Replace the clear plastic cover protecting the terminal studs on the faceplate.
Connecting an MX2008 DC Power Distribution Module Cable (-48 V)
Before performing DC power procedures, disconnect all
power sources. To ensure that all power is off, locate the circuit
breaker on the panel board that services the DC circuit, switch the
circuit breaker to the OFF
position, and tape
the switch handle of the circuit breaker in the OFF
position.
To connect a power cable for a DC PDM:
- Locate a replacement power cable that meets the specifications defined in MX2008 DC Power (-48 V) System Electrical Specifications.
- Verify that a licensed electrician has attached a cable lug to the replacement power cable.
- Verify that the
–48V
LED is off. - 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 - 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.
- 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.
- Attach the power cable to the DC power source.
- Turn on the dedicated customer-site circuit breaker to the PDM.
- Verify that the
–48V
LED on the PDM is lit steadily. - 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.
See also
Replacing an MX2000 DC Power Supply Module (240 V China)
Removing an MX2000 Router DC Power Supply Module (240 V China)
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:
To maintain proper cooling and prevent thermal shutdown of the operating PSM, each PSM slot must contain either a PSM or a blank panel. If you remove a PSM, you must install a replacement PSM or a blank panel shortly after the removal.
After powering off a PSM, wait at least 60 seconds before turning it back on.
To remove a DC PSM (see Figure 30 and Figure 30):
The minimum number of DC PSMs change, based on the configuration.
- With one PSM installed and operational, remove any additional
PSM by turning the power switch to the off (
O
) position. - Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- 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.
- While grasping the handle on the PSM faceplate with one hand, use your other hand to guide the PSM away from the chassis.
- Pull the PSM straight out of the chassis.
Warning To avoid damage, do not touch the power connectors in back of the PSM.
- 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.

Installing an MX2000 Router DC Power Supply Module (240 V China)
Before you install a DC PSM (240 V China), be aware of the following:
The DC PSM is hot-swappable when a minimum number of PSMs installed and operational.
The DC PSMs have no circuit breakers that can physically disconnect DC current from the router. After DC feeds have been connected to the PDM, the DC voltage is always present on the power midplane and is distributed to the PSM connectors on the power midplane.
To maintain proper cooling and prevent thermal shutdown of the operating PSM, each PSM slot must contain either a PSM or a blank panel. If you remove a PSM, you must install a replacement PSM or a blank panel shortly after the removal.
After powering on a PSM, wait at least 60 seconds before turning it back off.
To install a DC PSM (see Figure 31):
- 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. - Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- While grasping the handle on the PSM faceplate with one hand, use your other hand to guide the power supply module into the chassis.
- 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.
- Turn on the power switch to the on (
|
) position. - Verify that the
PWR OK
LED is lit steadily green.

See also
Replacing an MX2000 DC Power Distribution Module (240 V China)
Removing an MX2000 Router DC Power Distribution Module (240 V China)
Installing an MX2000 Router DC Power Distribution Module (240 V China)
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:
The minimum number of PDMs must be present in the router at all times.
Before performing DC power procedures, disconnect all
power sources. To ensure that all power is off, locate the circuit
breaker on the panel board that services the DC circuit, switch the
circuit breaker to the OFF
position, and tape
the switch handle of the circuit breaker in the OFF
position.
To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each PDM slot must contain either a PDM or a blank panel. If you remove a PDM, you must install a replacement PDM or a blank panel shortly after the removal.
After powering off a PDM, wait at least 60 seconds before turning the circuit breaker back on.
- Switch off the dedicated customer site circuit breaker for the PDM being removed. Follow your site's procedures for ESD.
- 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.
- Verify that the LEDs on the PDM to be removed are not lit.
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- Move the DC circuit breaker on the power input source
to the
OFF
position. - 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 - 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
andPDM1/Input1
locking levers to release the PDM from the chassis, and pull up thePDM0/Input0
andPDM2/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 thePDM0/Input0
locking levers to release the PDM from the chassis.Figure 33: Removing a DC PDM (240 V China) from an MX2000 Router - The PDM is extended slightly away from the chassis. See Figure 33.
- 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.
- Place the PDM onto an antistatic mat or into a ESD bag.
Installing an MX2000 Router DC Power Distribution Module (240 V China)
Before performing DC power procedures, disconnect all power sources. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the off position, and tape the switch handle of the circuit breaker in the off position.
To install a DC power distribution module (PDM) in an MX2000 Router:
- 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.
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- Move the DC circuit breaker on the power input source to the off position.
- [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.
- Remove the blank panel covering the PDM slot in the chassis.
- Open the locking levers on the PDM.
- 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) - 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.
- 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
Before performing DC power procedures, disconnect all
power sources. To ensure that all power is OFF
, locate the circuit breaker on the panel board that services the
DC circuit, switch the circuit breaker to the OFF
position, and tape the switch handle of the circuit breaker in the OFF
position.
To connect the DC (240 V China) source power cables (CBL-PWR-240V-CH) to the router:
- 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.
- 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. - 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 - Connect the power cords for the remaining PDMs.
- Connect the power cable (CBL-PWR-240V-CH) to the DC power
source. See Figure 37.
Figure 37: 240 V China Power Cable 1—Negative3—Positive2—Ground - Switch on the dedicated customer site circuit breaker.
- 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.
- Observe the status LEDs on the PDM faceplate. If the PDM is correctly installed and functioning normally, the LEDs light green steadily.
- On each of the DC PSMs, move the switch to the on (|) position.
See also
Replacing an MX2000 High-Voltage Second-Generation Universal (HVAC/HVDC) Power Supply Module
Removing an MX2000 Router High-Voltage Second-Generation Universal (HVAC/HVDC) Power Supply Module
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:
To maintain proper cooling and prevent thermal shutdown of the operating PSM, each PSM slot must contain either a PSM or a blank panel. If you remove a PSM, you must install a replacement PSM or a blank panel shortly after the removal.
After powering off a PSM, wait at least 60 seconds before turning it back on.
To remove a universal HVAC/HVDC PSM (see Figure 38, Figure 39, and Figure 40):
The minimum number of PSMs change, based on the configuration.
- With one PSM installed and operational, remove any additional
PSM by turning the power switch to the off (
O
) position. - Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- 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.
- While grasping the handle on the PSM faceplate with one hand, use your other hand to guide the PSM away from the chassis.
- Pull the PSM straight out of the chassis.
Warning To avoid damage, do not touch the power connectors in back of the PSM.
- 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.



See also
Installing an MX2000 Router High-Voltage Universal (HVAC/HVDC) Power Supply Module
Before you install a universal (HVAC/HVDC) PSM, be aware of the following:
The universal (HVAC/HVDC) PSM is hot-swappable when a minimum number of PSMs installed and operational.
Depending on whether you are connecting to AC or DC power, these warnings apply to the universal HVAC/HVDC power distribution module (PDM):
The DC PSMs have no circuit breakers that can physically disconnect DC current from the router. After DC feeds have been connected to the PDM, the DC voltage is always present on the power midplane and is distributed to the PSM connectors on the power midplane.
The AC PSMs have no circuit breakers that can physically disconnect AC current from the router. After AC feeds have been connected to the PDM, the AC voltage is always present on the power midplane and is distributed to the PSM connectors on the power midplane.
To maintain proper cooling and prevent thermal shutdown of the operating PSM, each PSM slot must contain either a PSM or a blank panel. If you remove a PSM, you must install a replacement PSM or a blank panel shortly after the removal.
After powering on a PSM, wait at least 60 seconds before turning it back off.
To install a universal (HVAC/HVDC) PSM (see Figure 41, Figure 42, and Figure 43):
- 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. - Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- While grasping the handle on the PSM faceplate with one hand, use your other hand to guide the power supply module into the chassis.
- 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.
- Turn on the power switch to the on (
|
) position. - Verify that the
PWR OK
LED is lit steadily green.



See also
Replacing an MX2000 High-Voltage Universal (HVAC/HVDC) Power Distribution Module
Installing an MX2000 Router High-Voltage Universal (HVAC/HVDC) Power Distribution Module
Depending on whether you are connecting to AC or DC power, these warnings apply to the universal HVAC/HVDC power distribution module (PDM):
Before performing DC power procedures, disconnect all power sources. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the off position, and tape the switch handle of the circuit breaker in the off position.
Before performing AC power procedures, disconnect all
power sources. To ensure that all power is OFF
, locate the circuit breaker on the panel board that services the
AC circuit, switch the circuit breaker to the OFF
position, and tape the switch handle of the circuit breaker in the OFF
position.
Before working on the device or near power supplies, unplug all the power cords from an AC-powered device.
To install a universal HVAC/HVDC power distribution module (PDM) in an MX2000 Router:
- 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.
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- Move the DC circuit breaker on the power input source to the off position.
- [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.
- Remove the blank panel covering the PDM slot in the chassis.
- Open the locking levers on the PDM.
- 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 - 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.
- 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:
The minimum number of PDMs must be present in the router at all times while it is operating.
Depending on whether you are connecting to AC or DC power, these warnings apply to the universal HVAC/HVDC power distribution module (PDM):
Before performing DC power procedures, disconnect all
power sources. To ensure that all power is off, locate the circuit
breaker on the panel board that services the DC circuit, switch the
circuit breaker to the OFF
position, and tape
the switch handle of the circuit breaker in the OFF
position.
These warnings apply to the HVAC/HVDC universal PDM:
Before performing AC power procedures, disconnect all
power sources. To ensure that all power is OFF
, locate the circuit breaker on the panel board that services the
AC circuit, switch the circuit breaker to the OFF
position, and tape the switch handle of the circuit breaker in the OFF
position.
Before working on the device or near power supplies, unplug all the power cords from an AC-powered device.
To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each PDM slot must contain either a PDM or a blank panel. If you remove a PDM, you must install a replacement PDM or a blank panel shortly after the removal.
After powering off a PDM, wait at least 60 seconds before turning the circuit breaker back on.
- Switch off the dedicated customer site circuit breaker for the PDM being removed. Follow your site's procedures for ESD.
- 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.
- Verify that the LEDs on the PDM to be removed are not lit.
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- Move the AC or DC circuit breaker on the power input source
to the
OFF
position. - 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 - 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
andPDM1/Input1
locking levers to release the PDM from the chassis, and pull up thePDM0/Input0
andPDM2/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 thePDM0/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 - The PDM is extended slightly away from the chassis. See Figure 47, Figure 48, and Figure 49.
- 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.
- Place the PDM onto an antistatic mat or into a ESD bag.