990-55222B-001

Shut Down the UPS System into Maintenance Bypass Operation with an Inoperable Display

NOTE: If the display is operable, always go to Control > Guided sequences and follow the steps on the display to shut down the UPS.
  1. Press and hold the inverter OFF button on the system level controller for 5 seconds. This will transfer the UPS to forced bypass operation. Check that the inverter LED is off and the bypass LED is green on the system level controller. See Status LED Lighting per UPS Operation Mode.
  2. Close the maintenance bypass disconnect device MBB.
  3. In a parallel system: Open the system isolation disconnect device SIB.
  4. Open the unit output disconnect device UOB.
  5. Open the static switch input disconnect device SSIB (if present).
  6. Open the battery disconnect device(s).
  7. Open the unit input disconnect device UIB.
  8. In a parallel system: Repeat step 4 to 7 for the other UPSs in the parallel system.
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