Exchange the bus bar, 208VDC secondary

Before you begin

Icon for electrostatic discharge wrist strap Use approved ESD procedures to prevent damage.

Attention:

This procedure is not a stand-alone procedure. Customer disruption and damage to the hardware might occur when microcode and power boundaries are not in the proper conditions for this service action.
If a serviceable event FRU repair directed you to this procedure, the microcode and power boundaries are already set.
If a serviceable event FRU repair did not direct you to this procedure, see MAP1230 Replace a FRU without using a serviceable event.

Notes:

All the cables and FRUs to be removed must be uniquely identified so they can be reinstalled correctly.
If an installed earthquake resistance kit prevents you from accessing this FRU, refer to MAP1600.

Remove 208VDC secondary bus bar

Procedure

To locate this FRU, take one of the following actions and then return here and continue to replace the FRU:
- If this FRU has a FRU identify indicator, use the FRU identify indicator, which is listed in MAP1240 Locating FRUs by using identify indicators. If not, use the location code.
  Note: There might be cases where the FRU failure or fencing conditions prevent the FRU LED indicator from being lit even if the FRU has power.
- Use the location code, which is listed in MAP1245 Finding FRUs by using location codes.
- If there is no FRU identify indicator or location code, you were sent here by an isolation MAP or symbolic FRU procedure. Use the information in that procedure and the figures in this procedure to locate the proper part to exchange.
Most, but not all, FRUs have identify indicators. Use the flashing amber or solid blue FRU identify indicators to ensure that you are working on the correct enclosure or FRU.
- The light path identify LEDs are a hierarchy of LEDs that can identify the rack, enclosure, FRU, and even the FRU connector to which a cable is connected.
- For more information, refer to MAP1240 Locating FRUs by using identify indicators.
Unplug the black power cables from the bus bar. To release the connectors, gently pull the blue retention brackets and then slide them to the side.
If this is an expansion rack and it has old level sheet metal, the sheet metal baffle to the left of the gate and at the bottom of the storage enclosure chassis might need to be removed to allow the gate to swing open. Remove the two screws that fasten the baffle to the 19" rack mount vertical rails. If the baffle is the new level sheet metal, it has a flexible plastic cutout that bends out of the way when the gate is swung open.
Figure 1. Air baffle
Remove the two screws and open the 208VDC bus bar gate to the service position.
Figure 2. 208VDC bus bar gate service position
Unplug the 208VDC power input cable only from the side connector on the bus bar being replaced.
Figure 3. 208VDC power input cable
Remove the top screw and bottom screw [not shown] holding the bus bar to the swing gate.
Figure 4. Bus bar swing gate screws
Remove the bus bar.

Install 208VDC secondary bus bar

Procedure

Place the new bus bar in the bus bar swing gate and install the top and bottom retention screws.
Connect the 208VDC power input cable to the bus bar side connector.
Connect the black power cords to the proper bus bar connectors.
Move the blue retention brackets back into place.
Swing the bus bar gate back into the closed position and reinstall the two retention screws.
Note: If this is an expansion rack and the sheet metal baffle to the left of the gate was removed, reinstall it now with the two screws.
Ensure that CB0 and CB1 switches are set to on (up) on all battery modules in the rack.
Note: Certain short circuit conditions involving the 208VDC secondary bus bar can cause the battery module output circuit breakers to trip. Resetting them after bus bar replacement ensures battery power is available when needed.
Exit this service information center parts exchange procedure and return to the procedure that sent you here.