Quick Installation Guide for the AC Power Shelf

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1   Installing the AC Power Shelf

Figure 1   AC Power Shelf

Table 1    Order Numbers


Four-slot, one rack unit (RU) AC power shelf


2725 Watt AC power module unit with AC power cord


Spare cable kit—Includes one interconnect data cable, one set of DC jumper cables, and two AC power cords with North American plugs.

The AC power shelf requires one rack unit (RU) in a 19-inch or 23-inch rack. You must install it directly below the chassis.

If this is a DC to AC conversion, deenergize the DC power supplies.

Risk of electrical shock. Do not disconnect the power cables to the chassis until you have first deenergized the DC power supplies, and then removed the fuses for both the A- and B-side power sources in the fuse panel. With the power cables connected to the chassis and the fuse panel, the system is fully powered on, and you can incur electrical shock when you remove the cables from the chassis connectors.

If the chassis is not already shut down:

  1. Deenergize the DC power supplies, remove the fuses for both the A- and B-side power sources in the fuse panel, and then disconnect the power cables to the chassis.
  2. Remove the safety cover.
  3. Remove the DC jumper cables from the terminal blocks labeled BATTERY A and BATTERY B on the rear of the chassis.

Risk of personal injury. Do not attempt to access any component inside the AC power shelf; there are no user-serviceable components inside it.

Install the shelf in the rack:

  1. Position the shelf directly below the chassis so the screw holes in the shelf mounting brackets align with the screw holes in the rack just below the chassis.
  2. On a 19" wide rack, use the Phillips screwdriver to secure the shelf to the rack using the fasteners of the type compatible with the rack. Tighten the fasteners to the vendor recommended torque level.
  3. Install the ground bracket between the shelf and the chassis:
    1. On the chassis, remove the chassis ground lug at the lower-center rear of the chassis.

    2. Stack the ground bracket under the chassis ground lug and reattach it using the existing hardware; tighten to a maximum torque of 15.0 inch-lbs (1.7 Newton-meters).
    3. On the AC power shelf, use the Phillips screwdriver to secure the bracket to the available mounting position using the hardware provided.

Install the power modules:

  1. Open the front ejector (fan cover) of the power module by squeezing the latch spring and pulling open the ejector.

  2. Insert a module into one of the two center slots (2 and 3) in the shelf.
    AC power modules operate only from the two center slots of the AC power shelf.

  3. Push the module in until the right side of the ejector engages the receptacle slot in the shelf wall.
  4. Push closed the ejector lever until the module spring latch locks on the ejector to seat the module.
  5. Insert the second module into the other center slot and repeat steps 3 and 4.

Connect the shelf to the chassis:

  1. Unpack the two 6AWG red and two black DC jumper cables.

    Do not connect the AC power cords to the building outlets until you have completed the installation. If you connect the other end of the AC power cord to a building outlet, you power on the system; there is no ON/OFF switch on the AC power shelf.
  2. Flip open the touch-safe lug landing cover on the left-side terminal block.
  3. Attach the short pair of red and black DC jumper cables to the left-side terminals—red cable to the top terminal (+) and black cable to the bottom one (-).
  4. Secure each connection with a pair of 1/4-20 lug nuts; tighten to a maximum torque of 62.0 inch-lbs (7 Newton-meters).
  5. Snap the cover shut.
  6. Attach the remaining ends to the bottom (BATTERY B) terminal block of the chassis—red cable to the top terminal (RETURN) and black to the bottom one (-48V).
  7. Secure the connections with pairs of lock washers and lug nuts; tighten to a maximum torque of 62.0 inch-lbs (7 Newton-meters).
  8. Use the provided metal loops on the chassis to dress the cables with tie wraps.
    Dress the DC jumper cables so the push-through air filter can be serviced from the rear of the chassis.

  9. Repeat this procedure for the right-side self connections using the long pair of DC jumper cables.
    Dress the DC jumper cables so the fan tray can be serviced from the rear of the chassis.

  10. Install the safety cover.
  11. Connect the control cable from J1 (right-side flat connector) on the shelf to the chassis connector labeled AC STATUS/CTL.

  12. Insert the AC power cords for each power module into connectors 2 and 3 on the shelf.

  13. Power on the chassis by connecting the AC power cords to separate 220 VAC building outlets, each of which must be for a circuit rated at 20A with a 20A circuit breaker.
    The AC power cords ship with North American plugs installed. If you are connecting to another type of service, simply remove the plugs and replace them with the appropriate plugs.

  14. Check the status LEDs located on the alarm card at the top front of the chassis, and the AC input power and DC output power LEDs on the front of each installed power module.

If you encounter problems installing the AC power shelf, contact your local technical support representative.

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