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Removing an MX2010 Three-Phase Delta AC Power Distribution Module

 

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

Warning

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.

Warning

Do not touch the power connectors on the PDM. They can contain dangerous voltages.

Caution

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.

Note

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:

  1. Switch off the dedicated customer-site circuit breakers to the PDM being remove. Make sure that the voltage across the AC power source cord is 0 V and that there is no chance that the cord might become active during the removal process.
  2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
  3. Remove the ESD grounding strap from the ESD point on the chassis, and attach it to an approved site ESD grounding point. See instructions for your site.
  4. Disconnect the AC power cord (see Figure 1) from the power source.
    Figure 1: Three-Phase Delta AC Power Cord
    Three-Phase Delta
AC Power Cord
  5. Remove the ESD grounding strap from the approved site ESD grounding point. See the instructions for your site. Reconnect the strap to one of the ESD points on the chassis.
  6. Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the metal wiring compartment that protects the AC terminal block.
  7. Remove the cover of the metal AC wiring compartment.
  8. Disconnect the wires from the AC terminal block on the three-phase delta AC PDM (see Figure 2), loosen each of the input terminals or grounding point screws, and remove each wire form the grounding point or input terminal.

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

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

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

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

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

    Figure 2: Disconnecting the Power Cord from a Three-Phase Delta AC Power Distribution Module
    Disconnecting
the Power Cord from a Three-Phase Delta AC Power Distribution Module

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

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

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

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

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

    Note

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

    Note

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

  9. Loosen the plastic cable tie fastening the AC power cord to the PDM.
  10. Loosen and remove the retaining nut from the AC power cord.
  11. Pull the AC power cord out of the metal wiring compartment.
  12. Carefully move the AC power cable out of the way.
  13. Disconnect both of the AC power cords from the AC PDM.
  14. Loosen the two captive screws on the locking levers of the PDM faceplate completely.
  15. Pull the locking levers on either side of the faceplate up to unseat the PDM.
  16. Grasp the levers on the PDM faceplate and pull firmly. Slide it halfway out of the chassis (see Figure 3).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.

  17. Place one hand underneath the PDM to support it, and slide it completely out of the chassis.
Figure 3: Removing a Three-Phase Delta AC Power Distribution Module
Removing a Three-Phase
Delta AC Power Distribution Module
Note

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