DS8000 Service Documentation Version 7.5

MAP2050 Loss of AC Input to a single primary power supply

The primary power supply (PPS) is reporting a loss of line cord AC input. This can be due to a loss of customer line cord power or an internal failure in the AC to DC conversion section of the PPS.

About this task

This MAP assumes that only one PPS in this storage facility has reported a loss of line cord AC input. If more than one PPS in this storage facility lost AC input, a different serviceable event would have been created reporting customer power problems that did not require a repair action.
Related tasks:
How to start the service information center

MAP2050 Section-1

About this task

Note: If you replace the PPS FRU and the failure still occurs, replace the optional modules in the PPS also. For Model 94x, the optional modules, if present, are in the Ex-E2 and/or Ex-E3 locations. For Model 95x, the optional module, if present, is in the Ex-E2 location.
Figure 1. Location codes for the PPS (rear view)
Location codes for the PPS (rear view)

Procedure

  1. Using the location for the PPS FRU in the problem record, locate the PPS that has reported the loss of line cord AC.
  2. Observe the AC INPUT GOOD LED that is located on the front of the PPS.

    Is the AC INPUT GOOD LED lit?

    • Yes, go to step 3.
    • No, go to step 4.
  3. One of the following conditions applies:
    • The customer line cord input power to the PPS might have gone off and then been restored. If so, go to step 9.
    • The PPS is incorrectly reporting the loss of line cord AC. Return to the repair screen that sent you here to continue and replace the PPS FRU.
      Note: If you replace the PPS FRU and the failure still occurs, replace the optional modules in the PPS also.
  4. Locate and observe the customer line cord circuit breaker. Is it set to the On position?
    • Yes, go to step 5.
    • No, have the customer determine why the circuit breaker was off. When it is safe, have the customer set the circuit breaker to On and ensure that the PPS powers up properly. Then go to step 9.
  5. Ensure that all of the power connections between the customer power source and the PPS that is reporting the failure are properly connected before you continue with the next step.
  6. At the rear of the rack, switch the failing PPS input circuit breaker to off (down).
  7. At the rear of the rack, disconnect the mainline power cable from the failing PPS.
  8. Measure the customer power on the line cord to the failing PPS. Use step 2 and step 3 in the procedure Checking customer voltage with customer CB on (wired) to check the line cord voltages.

    Is the correct customer voltage present?

    • Yes, the PPS is failing. Return to the repair procedure to complete the replacement of the PPS. The line cord will be reconnected as part of the FRU replacement.
      1. Click Close in the current service information window.
      2. One or more HMC repair screens might prompt you for the result of using the service procedure in the MAP. Select Problem not fixed.
      3. Select No when prompted for whether you exchanged any parts.
      4. Select Yes when prompted for whether you isolated the problem.
      5. Select the PPS from the FRU list. The HMC begins the FRU exchange process for the selected FRU.
    • No, ensure the line cord is correctly connected to the customer power system. Report the problem to the customer, and after they have restored proper power that you can verify by measuring once again, complete the repair procedure for the PPS. This should reset any PPS fence that occurred. Then go to step 9 to ensure the PPS is available.
  9. The functional code might have fenced (removed from active use) the PPS as part of the error recovery. Determine if the PPS has been fenced.
    1. From the navigation area, click Storage Facility Management > storage facility.
    2. From the bottom Task area, click Service Utilities > View Storage Facility State.
    3. A window displays the status (passed/failed) of 25 or more system checks.
    4. At the bottom of the System Check Type column, observe the status of the Fenced Resources.

    Find the status that is displayed:

    • PASSED (no resources are fenced), close the serviceable event and exit this MAP.
    • FAILED, go to step 10.
  10. Display the fenced resource details.
    1. Click Fenced Resources to highlight it.
    2. Click Details.

      Does the Details screen list the PPS as a fenced resource?

    • Yes, go to step 11.
    • No, the PPS is not fenced. Close the serviceable event and exit this MAP. There should be serviceable events for resources that are fenced. These should be repaired.
  11. The PPS fence needs to be reset using the PPS FRU replace procedure. Return to the repair screen you followed to this point and do a pseudo repair of the FRU. A pseudo repair of the PPS means that you use the normal FRU replacement procedures, but you do not actually replace the PPS. In this situation (SRC BE19100x, directing MAP2050), it is not necessary to disconnect and reconnect PPS cables as part of the pseudo repair.
    1. Read all these substeps before going to substep b, which will close this information center window. To view this MAP in a separate information center window, click Help in the upper right corner of the main HMC GUI screen and navigate to the MAP.
    2. Click Close in the current service information window.
    3. One or more HMC repair screens might prompt you for the result of using the service procedure in the MAP. Select Problem not fixed.
    4. Select No when prompted for whether you exchanged any parts.
    5. Select Yes when prompted for whether you isolated the problem.
    6. Select the PPS from the FRU list. The HMC begins the FRU exchange process for the selected FRU.