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Maintaining the MX5, MX10, MX40, and MX80 Power Supplies and Cables

Maintaining the MX5, MX10, MX40, and MX80 Power Supplies

Purpose

For optimum router performance, verify the condition of the power supplies.

Action

On a regular basis:

  • Check the status of the power supplies by issuing the show chassis environment pem command. The output is similar to the following:

  • Make sure that the power and grounding cables are arranged so that they do not obstruct access to other router components.

  • Routinely check the status LEDs on the power supply faceplates and the front panel to determine if the power supplies are functioning normally.

  • Check the alarm LEDs on the front panel. Power supply failure or removal triggers an alarm that causes one or both of the LEDs to light. You can display the associated error messages by issuing the show chassis alarms command:

  • Periodically inspect the site to ensure that the grounding and power cables connected to the router are securely in place and that there is no moisture accumulating near the router.

Replacing an MX5, MX10, MX40, and MX80 AC Power Supply

Removing an MX5, MX10, MX40, and MX80 AC Power Supply

Before you remove a power supply, be aware of the following:

Note:

The minimum number of power supplies must be present in the router at all times.

CAUTION:

To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each power supply slot must contain either a power supply or a blank panel. If you remove a power supply, you must install a replacement power supply or a blank panel shortly after the removal.

Note:

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

To remove an AC power supply (see Figure 1):

  1. Switch off the dedicated customer site circuit breaker for the power supply, and remove the power cord from the AC power source. Follow the instructions for your site.
  2. Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
  3. Move the AC input switch next to the appliance inlet on the power supply to the off (O) position.
  4. Remove the power cord from the power supply.
  5. Press the release latch on the left side of the power supply to disconnect the power supply from the chassis.
  6. Pull the power supply straight out of the chassis.
Figure 1: Removing an AC Power SupplyRemoving an AC Power Supply

Installing an MX5, MX10, MX40, and MX80 AC Power Supply

To install an AC power supply (see Figure 2):

  1. Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
  2. Move the AC input switch next to the appliance inlet on the power supply to the off (O) position.
  3. Using both hands, slide the power supply straight into the chassis until the power supply is fully seated in the chassis slot. The power supply faceplate should be flush with any adjacent power supply faceplate or blank installed in the power supply slot.
  4. Attach the power cord to the power supply.
  5. Attach the power cord to the AC power source, and switch on the dedicated customer site circuit breaker. Follow the instructions for your site.
  6. Move the AC input switch next to the appliance inlet on the power supply to the on ( | ) position and observe the status LED on the power supply faceplate. If the power supply is correctly installed and functioning normally, the status LED lights green steadily.
Figure 2: Installing an AC Power SupplyInstalling an AC Power Supply

Replacing an MX5, MX10, MX40, and MX80 AC Power Supply Cord

Disconnecting an MX5, MX10, MX40, and MX80 AC Power Supply Cord

To disconnect the AC power cord:

  1. Switch off the dedicated customer site circuit breaker for the power supply, and remove the power cord from the AC power source. Follow the instructions for your site.
  2. Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
  3. Move the AC input switch next to the appliance inlet on the power supply to the off (O) position.
  4. Remove the power cord from the power supply.

Connecting an MX5, MX10, MX40, and MX80 AC Power Supply Cord

To connect the AC power cord:

  1. Locate a replacement power cord with the type of plug appropriate for your geographic location (see AC Power Cord Specifications for MX5, MX10, MX40, and MX80 Routers).
  2. Connect the power cord to the power supply.
  3. Insert the power cord plug into an external AC power source receptacle.
  4. Route the power cord appropriately. Verify that the power cord does not block the air exhaust and access to router components, or drape where people could trip on it.
  5. Switch the AC input switch on the each power supply to the on ( | ) position, and observe the status LED on the power supply faceplate. If the power supply is correctly installed and functioning normally, the status LED lights green steadily.

Replacing an MX5, MX10, MX40, and MX80 DC Power Supply

Removing an MX5, MX10, MX40, and MX80 DC Power Supply

Before you remove a power supply, be aware of the following:

Note:

The minimum number of power supplies must be present in the router at all times.

Warning:

Before performing DC power procedures, ensure that power is removed from the DC circuit. 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.

CAUTION:

To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each power supply slot must contain either a power supply or a blank panel. If you remove a power supply, you must install a replacement power supply or a blank panel shortly after the removal.

Note:

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

To remove a DC power supply (see Figure 3):

  1. Switch off the dedicated customer site circuit breaker for the power supply 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 status LED on the power supply is not lit.
  4. Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
  5. Move the DC circuit breaker on the DC power supply faceplate to the off (O) position.
  6. Remove the clear plastic cover protecting the terminal studs on the faceplate (see Figure 4).
  7. Remove the screw from each of the terminals. (Use a number 2 Phillips screwdriver.)
  8. Remove the cable lugs from the terminals.
  9. Carefully move the power cables out of the way.
  10. Press the latch located on the left side of the power supply, to release it from the chassis.
  11. Pull the power supply straight out of the chassis.
Figure 3: Removing a DC Power SupplyRemoving a DC Power Supply
Figure 4: Disconnecting the DC Power CablesDisconnecting the DC Power Cables

Installing an MX5, MX10, MX40, and MX80 DC Power Supply

Warning:

Before performing DC power procedures, ensure that power is removed from the DC circuit. 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 supply (see Figure 5):

  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 ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
  3. Switch the DC circuit breaker on the DC power supply faceplate to the off (O) position.
  4. Using both hands, slide the power supply straight into the chassis until the power supply is fully seated in the chassis slot. The power supply faceplate should be flush with any adjacent power supply faceplate or blank installed in the power supply slot.
  5. Remove the clear plastic cover protecting the terminal on the faceplate.
  6. Remove the screws from the terminals.
  7. Secure each power cable lug to the terminal with the screw (see Figure 6). Apply between 5 lb-in. (0.6 Nm) and 6 lb-in. (0.7 Nm) of torque to screw. Do not overtighten the nut. (Use a number 2 Phillips screwdriver.)
    1. Secure the positive (+) DC source power cable lug to the RTN (return) terminal.

    2. Secure the negative (–) DC source power cable lug to the –48V (input) terminal.

    CAUTION:

    Ensure that each power cable lug seats flush against the surface of the terminal block as you are tightening the screws. Ensure that each screw is properly threaded into the terminal. Applying installation torque to the screw when improperly threaded may result in damage to the terminal.

    CAUTION:

    You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on each power supply.

    Note:

    For information about connecting to DC power sources, see MX5, MX10, MX40, and MX80 Routers DC Power Specifications.

  8. Replace the clear plastic cover over the terminals on the faceplate.
  9. Verify that the power cabling is correct, that the cables are not touching or blocking access to router components, and that they do not drape where people could trip on them.
  10. On each of the DC power supplies, 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 (O) position if you move the breaker too quickly.

    Note:

    If more than one power supply is being installed, turn on all power supplies at the same time.

Figure 5: Installing a DC Power SupplyInstalling a DC Power Supply
Figure 6: Connecting the DC Power CablesConnecting the DC Power Cables

Replacing an MX5, MX10, MX40, and MX80 DC Power Supply Cable

Disconnecting an MX5, MX10, MX40, and MX80 DC Power Supply Cable

Warning:

Before performing DC power procedures, ensure that power is removed from the DC circuit. 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 power supply:

  1. Switch off the dedicated customer site circuit breaker for the power supply 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 status LED on the power supply is not lit.
  4. Remove the power cable from the external DC power source.
  5. Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
  6. Move the DC circuit breaker on the DC power supply faceplate to the off (O) position.
  7. Remove the clear plastic cover protecting the terminal studs on the faceplate.
  8. Remove the screw from each of the terminals. (Use a number 2 Phillips screwdriver.)
  9. Remove the cable lugs from the terminals.
  10. Carefully move the power cables out of the way.

Connecting an MX5, MX10, MX40, and MX80 DC Power Supply Cable

Warning:

Before performing DC power procedures, ensure that power is removed from the DC circuit. 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 power supply:

  1. Locate a replacement power cable that meets the specifications.
  2. Verify that a licensed electrician has attached a cable lug to the replacement power cable.
  3. Verify that the status LED is off.
  4. Secure each power cable lug to the terminal with the screw (see Figure 7). Apply between 5 lb-in. (0.6 Nm) and 6 lb-in. (0.7 Nm) of torque to screw. Do not overtighten the nut. (Use a number 2 Phillips screwdriver.)
    1. Secure the positive (+) DC source power cable lug to the RTN (return) terminal.

    2. Secure the negative (–) DC source power cable lug to the –48V (input) terminal.

    CAUTION:

    Ensure that each power cable lug seats flush against the surface of the terminal block as you are tightening the screws. Ensure that each screw is properly threaded into the terminal. Applying installation torque to the screw when improperly threaded may result in damage to the terminal.

    CAUTION:

    The maximum torque rating of the terminal screws on the DC power supply is 6 lb-in. (0.7 Nm). The terminal screws may be damaged if excessive torque is applied. Use only a torque-controlled driver to tighten screws on the DC power supply terminals. Use an appropriately-sized driver, with a maximum torque capacity of 6 lb-in. or less. Ensure that the driver is undamaged and properly calibrated and that you have been trained in its use. You may wish to use a driver that is designed to prevent overtorque when the preset torque level is achieved.

    Figure 7: Connecting Power Cables to the DC Power SupplyConnecting Power Cables to the DC Power Supply
  5. 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.
  6. Replace the clear plastic cover over the terminals on the faceplate.
  7. Attach the power cable to the DC power source.
  8. Turn on the dedicated customer site circuit breaker to the power supply.
  9. Verify that the status LED on the power supply is lit green steadily.
  10. On each of the DC power supplies, 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 (O) position if you move the breaker too quickly.

    Observe the status LED on the power supply faceplate. If the power supply is correctly installed and functioning normally, the status LED lights green steadily.