990-91079G-001

Transfer a Single UPS from Maintenance Bypass Mode to Normal Mode

  1. 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 OFF (open) position.

    • the battery breakers BB are in the OFF (open) position.

    • the maintenance bypass breaker MBB is in the ON (closed) position.

    • the maintenance bypass breaker MBB cover is removed.

  2. Turn the static switch input breaker SSIB to the ON (closed) position.

    The display turns on and the Home screen is shown.

  3. Turn the unit output breaker UOB to the ON (closed) position.

    The UPS starts up in static bypass mode.

  4. Turn the unit input breaker UIB to the ON (closed) position.

    The rectifier ramps up.

  5. When the rectifier LED turns steady green, the inverter synchronizes with bypass.
  6. Turn the battery breaker(s) BB to the ON (closed) position.
  7. When the Bypass LED is steady green, turn the maintenance bypass breaker MBB to the OFF (open) position.
  8. Reinstall the cover on the maintenance bypass breaker MBB. Refer to Location of Breakers - 400 V Systems.
    NOTE: The system will not transfer to normal mode before the maintenance bypass cover has been reinstalled.
  9. On the display select and then select Function > Clear alarm .
    NOTE: The system will not transfer to normal mode before the maintenance bypass cover has been reinstalled and the alarm has been cleared.
  10. After approximately 60 seconds, the UPS will automatically transfer to normal mode.

    The LEDs on the user interface show as follows:

QR Code is a registered trademark of DENSO WAVE INCORPORATED in Japan and other countries.

Was this helpful?