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Removing a DC Power Supply

The power supplies are located at the rear of the chassis. Each DC power supply weighs approximately 3.8 lb (1.7 kg).

Caution: Do not leave a power supply slot empty for more than 30 minutes while the services gateway is operational. For proper airflow, the power supply must remain in the chassis, or a blank panel must be used in an empty slot.

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

To remove a DC power supply:

  1. 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.
  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. For more information about ESD, see Preventing Electrostatic Discharge Damage.
  3. Switch the circuit breaker on the power supply faceplate to the OFF position O.
  4. Remove the clear plastic cover protecting the terminal studs on the faceplate.
  5. Remove the nuts and washers from the terminal studs (see Figure 2). (Use a 3/8–in. nut driver or pliers.)

    Figure 2: Disconnecting Power Cables from the DC Power Supply

    Image g004038.gif

  6. Remove the cable lugs from the terminal studs.
  7. Loosen the captive screw on the cable restraint on the lower edge of the power supply faceplate.
  8. Carefully move the power cables out of the way.
  9. While grasping the handle on the power supply faceplate with one hand, use your other hand to pull the spring-loaded locking pin in the release lever away from the chassis and turn the release lever counterclockwise until it stops (see Figure 3).
  10. Let go of the locking pin in the release lever. Ensure that the pin is seated inside the corresponding hole in the chassis.
  11. Pull the power supply straight out of the chassis.

    Warning: Do not touch the power connector on the top of the power supply (see Figure 4). It can contain dangerous voltages.

Figure 3: Removing a DC Power Supply

Image g004087.gif

Figure 4: Top of the Power Supply Showing Midplane Connector

Image g004057.gif

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