Connecting a -48V dc Power Distribution Panel (PDP), feature code 6117

Some rack models (such as the 7014-T00) can support a dc power configuration for systems that require dc power.

1. Remove the six mounting screws from the top cover of the dc power distribution panel and remove the top cover.
2. Remove the cable channel cover. To remove the cable channel cover, complete the following steps:
   1. Loosen the four retaining screws.
   2. Align the larger openings in the cover with the retaining screw heads.
   3. Lift the cover up to clear the retaining screws and remove it.
   Figure 1. Removing the cable channel cover

   

   Item	Description	Item	Description
   1	Cable channel cover retaining screw	5	Shield
   2	Cable channel cover	6	Power distribution panel
   3	Power distribution panel top cover retaining screws
   4	Power distribution panel top cover

3. Remove the -48 V dc bus bar shield from the power distribution panel.
   DANGER
   The bus bar shield must be correctly reinstalled over the -48 V dc return bus bars to protect against injury when the power distribution panel is serviced.
4. Ensure that the following steps are completed when you connect the dc power source.
   1. At -48 V dc power source, turn off any -48 V dc power sources that you plan to connect to the power distribution panel.
   2. After the -48 V dc power sources are turned off, place a tag or label over the power source switches or fuses (lock-out/tag-out) to indicate that you turned off the power source intentionally.
      Note: Ensure that any oxidation on the copper bus bars is removed.
   3. If this is a raised-floor installation and you are working at the rear of the rack, route the power cables up the rack's right side.
   4. Ensure that the external -48 V dc power cable is connected correctly to the -48 V dc bus bar.
   5. Ensure that the external -48 V dc return cable is routed correctly and installed on the return bus bar.
      Figure 2. Routing the power cables

      

      Item	Description
      1	-48 V dc power cable and return power cable
      2	Power distribution panel
      3	Front of rack
      4	-48 V dc power cable and return power cable

      Figure 3. Return bus bar

      

      Item	Description	Item	Description
      1	Front of power distribution panel	6	(B) Return (-) power cable
      2	(A) -48 V dc (-) bus bar	7	(B) -48 V dc (-) power cable
      3	(A) -48 V dc (-) power cable	8	(B) Return (-) bus bar
      4	(A) Return (-) bus bar	9	(B) -48 V dc (-) bus bar
      5	(A) Return (-) power cable

   6. If you want to install a power status alarm, connect the alarm cable to the terminal board on the rear cover of the dc power distribution panel.
      Note: Ensure that you remove the oxidation on the copper bus bars.
   7. Ensure that the power-source ground cable is routed correctly and connects the power-source ground cable to the copper bar at the lower-rear or upper-rear center of the rack.
   8. If the rack is on a raised floor, attach the -48 V dc power source cables to the rear of the rack with cable-restraint straps.
      Figure 4. Cable locations

      

      Item	Description
      1	Rear view of rack (dc)
      2	Power cable, power return cable, and ground
      3	Ground cable (Install at either top or bottom of the rack)

5. Reinstall the -48 V dc bus bar shield.
6. Reinstall the top cover on the dc power distribution panel.
7. Reinstall the cable channel cover.
   Figure 5. Reinstalling the cable channel cover

   

   Item	Description
   1	Cable channel cover
   2	Terminal block (both sides)
   3	Power distribution panel
   4	Front of rack