MAP 5320: Redundant ac power

MAP 5320: Redundant ac power helps you solve problems that have occurred in the redundant ac-power switches used on a SAN Volume Controller. Use this MAP when a 2145 UPS-1U that is connected to a redundant ac-power switch does not appear to have input power.

1. One or two 2145 UPS-1Us might be connected to the redundant ac-power switch. Is the power-on indicator on any of the connected 2145 UPS-1Us on?

   NO

   Go to step 3.

   YES

   The redundant ac-power switch is powered. Go to step 2.

2. (from step 1)

   Measure the voltage at the redundant ac-power switch output socket connected to the 2145 UPS-1U that is not showing power-on.

   CAUTION:
   Ensure that you do not remove the power cable of any powered uninterruptible power supply units
   Is there power at the output socket?

   NO

   One redundant ac-power switch output is working while the other is not. Replace the redundant ac-power switch.

   CAUTION:

   You might need to power-off an operational node to replace the redundant ac-power switch assembly. If this is the case, consult with the customer to determine a suitable time to perform the replacement. See MAP 5350: Powering off a SAN Volume Controller node. After you replace the redundant ac-power switch, continue with MAP 5340: Redundant ac power verification.

   YES

   The redundant ac-power switch is working. There is a problem with the 2145 UPS-1U power cord or the 2145 UPS-1U . Return to the procedure that called this MAP and continue from where you were within that procedure. It will help you analyze the problem with the 2145 UPS-1U power cord or the 2145 UPS-1U.

3. (from step 1)

   None of the used redundant ac-power switch outputs appears to have power.

   Are the two input power cables for the redundant ac-power switches correctly connected to the redundant ac-power switch and to different mains circuits?

   NO

   Correctly connect the cables. Go to MAP 5340: Redundant ac power verification.

   YES

   Verify that there is main power at both the site's power distribution units that are providing power to this redundant ac-power switch. Go to step 4.

4. (from step 3)
   Is power available at one or more of the site's power distribution units that are providing power to this redundant ac-power switch?

   NO

   Have the customer fix the mains circuits. Return to the procedure that called this MAP and continue from where you were within that procedure.

   YES

   The redundant ac-power switch should operate in this situation. Replace the redundant ac-power switch assembly. After you replace the redundant ac-power switch, continue with MAP 5340: Redundant ac power verification.