Exchange the power distribution unit

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.

DANGER

Hazardous voltage, current, or energy levels are present inside of a component to which this label is attached. (L001)

Remove the power distribution unit

Procedure

To locate this FRU, do one of the following 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 may 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 as well as the figures in this procedure to locate the proper part to exchange.
Figure 1. Locations for power distribution units
Most, but not all, FRUs have identify indicators. Use the blinking amber or solid blue FRU identify indicators to ensure that you are working on the correct enclosure and/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, reference MAP1240 Locating FRUs by using identify indicators.
Put the set of three PDUs in the service position and then remove the PDU alignment bracket. To gain full access, unfasten and then rotate the needed power distribution units (PDUs) away from the rear of the rack.
1. Loosen the three fasteners and open the PDU set.
2. Pull the spring plunger , slide the alignment bracket up and remove it.
Figure 2. PDU alignment bracket
Unfasten the power distribution unit (PDU) to be replaced, allowing the PDU to swing freely.
Disconnect the PDU power input cable and PDU-to-PDU power cable from the right side.
Figure 3. Power distribution unit connectors
Unlatch and disconnect all power output cables (Figure 3) to the storage enclosures, I/O enclosures, and/or CEC enclosures from the left side. Also unlatch and remove any dummy plugs from the left side of the PDU.
Disconnect the yellow/green ground cable from the threaded stud on the rack, near the rear of the PDU. Retain the lock nut and star washer for use with the new PDU.
Remove the PDU to be replaced by rotating it away from the PPS, lifting it far enough to disengage the hinge pins, and pulling it away from the rack.

Install the power distribution unit

Procedure

Install the new PDU by aligning the hinge pins and lowering the unit into place.
Place the star washer onto the threaded stud on the rack, followed by the PDU ground cable lug. Ensure the star washer is between the ground lug and the rack. Secure the ground lug with the lock nut.
Connect the PDU power input cable and PDU-to-PDU power cables.
Note: This restores power to the PDU.
Connect the storage enclosure, I/O enclosure, and CEC enclosure power output cables to the PDU which was replaced. Insert the dummy plugs in the remaining connectors. Latch all connections.
Install the PDU alignment bracket and ensure the spring plunger secures it in place.
Return the PDUs to the closed position and fasten them.
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 power distribution unit can cause the battery module output circuit breakers to trip. Resetting them after PDU 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.