990-66230A-001

Transfer a Parallel System from Maintenance Bypass Operation to Normal Operation

  1. Check that:
    • UIB, SSIB, UOB, MBB for all UPSs are in the OFF (open) position.

    • Ext. UOB, MIB, BIB, BBs for all UPSs are in the OFF (open) position.

  2. Close SSIB, UIB, UOB on all UPSs.
  3. Close Ext. UOB on all UPSs.
  4. Close SIB.
  5. Close BIB on all UPSs. Wait approximately 20 seconds and the UPS starts up in static bypass operation.
  6. Open Ext. MBB.
    NOTE: If the parallel system has input contacts with MBB contact NO or MBB contact NC signal, on the display of any one UPS in the parallel system, from the main menu, tap Maintenance > Alarm clear.
  7. Close MIB and BBs on all UPSs. Wait approximately 100 seconds and the system transfers to normal operation.
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