990-6537C-001

Shut Down the Parallel UPS System into Maintenance Bypass Operation – for UPSs with Four Internal Switches

NOTE: The following is a generic shutdown procedure. All the switches/breakers mentioned may not be present in your specific system.
  1. Make sure MBB is open.
  2. Select Control > Operation mode > Transfer to bypass operation if possible.
  3. Close Ext. MBB.
  4. Open SIB.
  5. Open UOB (if present).
  6. Open SSIB.
  7. Open the battery breaker(s).
  8. Open UIB.
  9. Open MIB and BIB (if present).
  10. Repeat step 5 to 9 for other UPSs in a parallel system.
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