990-5995E-001

Transfer a Parallel System from Maintenance Bypass Mode to Normal Mode

  1. Check that:
    1. All upstream disconnection devices (MIB, BIB, and SIB) are in the OFF (open) position.
    2. All UPS disconnection devices (UIB, SSIB, and UOB) and the Ext. UOB are in the ON (closed) position.
    3. The BBs are in the OFF (open) position.
  2. Turn the SIB and the UOB of all UPSs to ON (closed) position.
  3. Turn the BIB and the SSIB of all UPSs to the ON (closed) position.

    Wait approximately 20 seconds until the bypass LEDs turn yellow.

  4. Turn the Ext. MBB to the OFF (open) position.
  5. Turn the MIB and the UIB of all UPSs to the ON (closed) position.

    When the inverter LED turns steady green, the parallel system automatically transfers from static bypass to normal mode.

  6. Turn the BBs of all UPSs to the ON (closed) position.

    The LEDs on the user interfaces show as follows:

    The parallel system is now in normal mode.

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