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ACX7348 Power Supply Module Maintenance

SUMMARY Learn how to replace a power supply module (PSM). Replacing a PSM includes removing a failed PSM from a power supply slot and installing a functional PSM in that slot.

The power supply modules (PSMs) in an ACX7348 router are hot-removable and hot-insertable field-replaceable units (FRUs). You can remove and replace the PSMs without powering off the router or disrupting routing functions.

Remove an ACX7348 AC Power Supply Module

Before you remove a PSM from a router, ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage (see Prevention of Electrostatic Discharge Damage).

Ensure that you have the following parts and tools available to remove a PSM from a router:

  • ESD grounding strap

  • Antistatic bag or an antistatic mat

To remove an AC PSM from an ACX7348 router:

  1. Place the antistatic bag or the antistatic mat on a flat, stable surface.
  2. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to the ESD point on the chassis.
  3. Disconnect power to the router. If the AC power source outlet has a power switch, set it to the off (O) position. If the AC power source outlet does not have a power switch, gently pull out the power cord plug connected to the power source outlet.
  4. Remove the power source cable from the PSM faceplate. Remove the power cord from the power supply faceplate by gently pulling out the socket end of the power cord connected to the power supply faceplate.
  5. Slide the ejector lever toward the handle until you can no longer slide it.
    Figure 1: Remove an AC PSM from the ACX7348 Router Remove an AC PSM from the ACX7348 Router
  6. Grasp the PSM handle and pull firmly to slide the PSM halfway out of the chassis.
  7. Place one hand under the PSM to support it and slide it completely out of the chassis. Take care not to touch power supply components, pins, leads, or solder connections.
  8. Place the PSM in the antistatic bag or on the antistatic mat placed on a flat, stable surface.

Install an ACX7348 AC Power Supply Module

Before you install a PSM in a router, ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage (see Prevention of Electrostatic Discharge Damage).

To install an AC PSM in an ACX7348 router:

  1. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to the ESD point on the chassis.
  2. Remove the PSM from its bag, taking care not to touch power supply components, pins, leads, or solder connections.
  3. Using both hands, place the PSM in the power supply slot on the front panel of the router and slide it in until it is fully seated and the ejector lever slides into place.
    Figure 2: Install an AC PSM in an ACX7348 Router Install an AC PSM in an ACX7348 Router
  4. Attach the power cord to the PSM.
    Figure 3: Install an AC Power Cord on an ACX7348 Router Install an AC Power Cord on an ACX7348 Router
  5. Attach the power cord to the AC power source, and switch on the dedicated customer-site two-pole circuit breaker.
    Note:

    You must connect each PSM to a dedicated AC power feed and a dedicated customer-site two-pole circuit breaker. We recommend that you use a dedicated customer-site circuit breaker rated for 16 A and 250 V or as required by local code.
  6. Observe the status LED on the PSM faceplate. If the PSM is correctly installed and functioning normally, the status LED lights green steadily.

Remove an ACX7348 DC Power Supply Module

Before you remove a power supply module (PSM), be aware of the following:

Note:

The minimum required number of PSMs must always be present in the router.
Warning:

Before performing DC power procedures, ensure that power is removed from the DC circuit. To ensure that all power is off, locate the two-pole 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.

Ensure that you have the following parts and tools available to remove a PSM from a router:

  • Electrostatic discharge (ESD) grounding strap

  • Antistatic bag or an antistatic mat

To remove a DC PSM:

  1. Switch off the dedicated customer-site two-pole circuit breaker for the PSM being removed. Follow your site's procedures for preventing ESD damage.
  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 LED on the PSM is unlit.
  4. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to the ESD point on the chassis.
  5. Remove the terminal block cover protecting the terminals on the PSM faceplate.
  6. Using a Phillips screwdriver, remove the nuts from the DC power terminals.
    Figure 4: Remove the Nuts from the Terminals Remove the Nuts from the Terminals
  7. Remove the cable lugs from the terminals.
  8. Carefully move the power cables out of the way.
  9. Press the ejector lever located on the DC PSM to release the PSM from the chassis.
    Figure 5: Remove a DC PSM from an ACX7348 Router Remove a DC PSM from an ACX7348 Router
  10. Pull the PSM straight out of the chassis.
  11. Place the PSM in the antistatic bag or on the antistatic mat placed on a flat, stable surface.

Install an ACX7348 DC Power Supply Module

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 PSM:

  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. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to the ESD point on the chassis.
  3. Using both hands, slide the DC PSM straight into the slot on the front panel of the chassis until the PSM is fully seated in the slot.
    Figure 6: Install a DC PSM in an ACX7348 Router Install a DC PSM in an ACX7348 Router
  4. Connect the PSM to power.
    1. Remove the terminal block cover protecting the terminals on the faceplate.
      Figure 7: Remove the Terminal Block Cover Remove the Terminal Block Cover
    2. Remove the nuts from the terminals.
      Figure 8: Remove the Nuts from the Terminals Remove the Nuts from the Terminals
    3. Secure each power cable lug to its terminal with the nuts. Use the screwdriver to tighten the nuts on the power supply terminals until snug. Do not apply vertical force while tightening the screws. Use a socket nut driver to ensure you don't overtighten the nuts.

      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/-60V (input) terminal.

      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 into the terminal. Applying installation torque to the nuts 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.
    4. Replace the terminal block cover over the terminals on the faceplate.
      Figure 9: Replace the Terminal Block Cover Replace the Terminal Block Cover
  5. Verify that the power cabling is correct, that the cables do not touch or block access to router components, and that the cables do not drape where people could trip over them.
  6. Attach the power cable to the DC power source. Then switch on the dedicated customer-site two-pole circuit breaker.
    Note:

    The connection between each power source and PSM must include a circuit breaker. We recommend that you use a customer-site two-pole circuit breaker rated for 63 A and 80 V, or as required by local electrical code.
  7. Observe the LED on the PSM faceplate. If the PSM is installed correctly and is functioning normally, the LED lights green steadily.