DS8000 Service Documentation Version 7.5

Checking expansion rack UEPO switch operation

Procedure

  1. Remove the lockout tag and/or device that was applied to each customer mainline AC voltage circuit breaker, then switch on the customer circuit breaker.
  2. Switch on each customer circuit breaker.
  3. At the rear of the expansion rack, switch the MAINLINE CB00 on each primary power supply (PPS) to the On (up) position.
  4. Observe the six vertical LED indicators at the front of each primary power supply (to the left of the fans).
    Note: The expansion rack UEPO switch must be in the Off (down) position.

    Use Table 1 to find the condition that applies:

    Table 1. LED indicators when MAINLINE CB00 is on
    AC INPUT GOOD UEPO LOOP GOOD PPS Display Panel Action
    On Off Ignore Normal condition, continue with the next step
    On On Ignore UEPO fault, go to MAP21F0 UEPO loop good LED should be off
    Off Off Ignore Input power fault, go to MAP2050 Loss of AC Input to a single primary power supply
    Note: If both PPSs are failing, then repeat the customer voltage checks done previously.
  5. Using a narrow instrument (such as a small screwdriver or car key), push the upper half of the red UEPO switch through the sheet metal slot to reset the switch to the On (up) position.
  6. Wait a maximum 5 minutes for the PPS self tests to complete. The LED indicators for 208V PWR GOOD and DDM PWR GOOD will be blinking.
    1. Use Table 2 to find the condition that applies.
      Note: The top front fan of each PPS will not spin at this time because the PPS output power is not yet enabled.
    Table 2. LED indicators when UEPO switch is on
    AC INPUT GOOD UEPO LOOP GOOD PPS Display Panel Action
    On On Blank, U0, XC, XE or XF
    Note: Some levels of PPS firmware cause an XC error code to be displayed. This is a false error. The condition remains until the DDM power supply is turned on in a later step.

    The XE and XF status report that the PPSs are not communicating with the RPC cards. This is expected as the expansion rack power control cables from the PPS to Rack-1 RPC card cables have not yet been connected.

    No action is required. Continue with the next step.

    		 Normal condition, continue with the next step.
    On On Two-character status code other than Blank, U0, XC, XE or XF. Go to MAP21A0 PPS fault isolation during install
    On Off Ignore the display's status code. This is a UEPO fault. Go to MAP21E0 UEPO Loop Good LED should be on
  7. Swing the 208VDC bus bar gate back into its non-service position. Reinstall and tighten the two retaining screws.
  8. If you removed the air baffle  2  earlier to allow the 208VDC bus bar to swing open, reinstall it. See Figure 1.
    Figure 1. Air baffle
    Air baffle, B-box
  9. Are you installing Rack-2?