990-91079G-001

Start Up and Add a UPS to a Running Parallel System

Use this procedure to start up a UPS and add it to a running parallel system.

IMPORTANT: Before a UPS can be added to a parallel system, the parallel system must be configured by Schneider Electric.

  1. On the new UPS check that:
    • all UPS breakers (unit input breaker UIB, static switch input breaker SSIB, and unit output breaker UOB) and the external unit output breaker Ext. UOB are in the ON (closed) position

    • the battery breaker(s) BB are in the OFF (open) position

  2. Turn the external unit output breaker Ext. UOB of the UPS to the ON (closed) position.
  3. Turn the mains input breaker MIB and the bypass input breaker BIB of the UPS to the ON (closed) position.

    The display turns on and the Home screen is shown.

    The LEDs on the user interface show as follows:

  4. When the rectifier LED turns steady green, the UPS transfers to static bypass mode.

    The LEDs on the user interface show as follows:

  5. When the inverter LED turns steady green, the UPS automatically transfers from static bypass to normal mode and joins the running parallel system.

    The LEDs on the user interface show as follows:

  6. Turn the battery breaker(s) BB of the UPS to the ON (closed) position.

    The LEDs on the user interface show as follows:

  7. Verify correct load sharing between the parallel UPS units.
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