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Maintaining MX204 Power System Components

 

Maintaining the MX204 Power Supplies

Purpose

For optimum router performance, verify the condition of the power supply modules.

Action

On a regular basis, check the power supply status:

  • To check the power supply status, issue the show chassis environment CLI command. The output is similar to the following:

    user@host> show chassis environment
  • 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 craft interface to determine if the power supplies are functioning normally.

  • Check the red and yellow alarm LEDs on the craft interface. 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 following command:

    user@host> show chassis alarms
  • 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.

Caution

Do not mix AC and DC power supplies in the same chassis.

Replacing an MX204 AC Power Supply

Removing an MX204 AC Power Supply

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

Note

The minimum required number of power supply modules 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.

Caution

Do not mix AC and DC power supply modules in the same chassis.

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 strap to one of the ESD points on the chassis.
  3. Remove the power cord from the power supply.
  4. Press the release latch on the side of the AC power supply to disconnect the power supply from the chassis (see Figure 1).
  5. Pull the power supply straight out of the chassis.
Figure 1: Removing an AC Power Supply
Removing an AC Power
Supply

Installing an MX204 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 strap to one of the ESD points on the chassis.
  2. Using both hands, hold and slide the AC power supply straight into the chassis until the power supply is fully seated in the chassis slot. The power supply faceplate must alligned with any adjacent power supply faceplate or blank installed in the power supply slot.
  3. Press the latch located on the side of the power supply to slide it into the chassis.
  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. 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 Supply
Installing
an AC Power Supply

Replacing an MX204 DC Power Supply

Removing an MX204 DC Power Supply

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

Note

The minimum required number of power supply modules 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.

Caution

Do not mix AC and DC power supply modules in the same chassis.

To remove 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. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis.
  5. Remove the clear plastic cover protecting the terminal studs on the faceplate.
  6. Using a socket screw driver, remove the screw from each of the DC power terminals (see Figure 3).
  7. Remove the cable lugs from the terminals.
  8. Carefully move the power cables out of the way.
  9. Press the latch located on the DC power supply, to release it from the chassis.
  10. Pull the power supply straight out of the chassis (see Figure 4).
Figure 3: Disconnecting the DC Power Cables
Disconnecting the DC Power Cables
Figure 4: Removing a DC Power Supply
Removing a DC Power
Supply

Installing an MX204 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 strap to one of the ESD points on the chassis.
  3. Using both hands, slide the DC power supply straight into the chassis until the power supply is fully seated in the chassis slot. The power supply faceplate must alligned with any adjacent power supply faceplate or blank installed in the power supply slot.
  4. Remove the clear plastic cover protecting the terminal on the faceplate.
  5. Remove the screws from the terminals.
  6. 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 the screw. Do not overtighten the screw (use a socket nut driver).
    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 can 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.

  7. Replace the clear plastic cover over the terminals on the faceplate.
  8. Verify that the power cabling is correct, that the cables do not touch or block access to router components, and that they do not drape where people could trip on them.
  9. Attach the power cable to the DC power source, and switch on the dedicated customer-site circuit breaker. Follow the instructions for your site.Note

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

  10. 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 5: Installing a DC Power Supply
Installing a DC
Power Supply
Figure 6: Connecting the DC Power Cables
Connecting the DC Power Cables