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.
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On the new UPS check that:
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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
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the battery breaker(s) BB are in the OFF (open) position
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- Turn the external unit output breaker Ext. UOB of the UPS to the ON (closed) position.
- Turn the mains input breaker MIB and the bypass input breaker BIB of the UPS to the ON (closed) position.
- When the rectifier LED turns steady green, the UPS transfers to static bypass mode.
- When the inverter LED turns steady green, the UPS automatically transfers from static bypass to normal mode and joins the running parallel system.
- Turn the battery breaker(s) BB of the UPS to the ON (closed) position.
- Verify correct load sharing between the parallel UPS units.