CE+T America Stabiliti 30C3 750/480, Manual

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System Startup – Initial Start of System:
The system must be set up when the grid is present. Upon interconnecting everything, the CCS shall
engage 24 volts to the one digital signal connected to Stabiliti and at the same time it shall energize/close
the Grid Interconnect Contactor (GIC). At this time the load is powered via the grid. Now each stabiliti
should be manually commissioned and brought online. Note that Stabiliti’s AC port must be set in “FPWR”
mode. When grid is present and CCS is not commanding the Stabiliti to form the grid, Stabiliti will wait for
CCS to send a power command to support the load.
Follow to Form Operation – Loss of Grid:
When the grid is lost, the CCS must detect the loss of grid and before commanding the Stabiliti to form
microgrid, it must ensure the system is isolated from the grid by opening up GIC. Upon successful GIC
operation, it must command Stabiliti to form microgrid. Note that if CCS is not fast enough to make these
decisions, the load may be dropped, and additional coordination will be required to black start the loads.
This will be solely customer’s responsibility to ensure reliable Stabiliti operation.
The Stabiliti’s on board control systems are normally powered via the 480-vac connection. During the
“follow ing to forming” transition , the UPS within the Islanding switchgear provides power to keep the
internal Stabiliti controls running.
Form to Follow Operation – Grid is Back:
When the grid is back, CCS must ensure that the grid formed by Stabiliti is in sync (phase, voltage,
frequency) with the grid and upon successful sync, CCS can close the GIC and release the microgrid
command signal from Stabiliti.
Again, this will be solely customer’s responsibility to ensure reliable Stabiliti
operation
Application:
This method is best suited for customers who do not wish to use CE+T provided islanding switchgear.
While this method saves upfront cost (no cost added for Islanding Switchgear) it adds significant amount
of work for the customer to build the ““Islanding Assist Box” and also make changes to CCS to control
“Islanding Assist Box” and GIC.
Disclaimer:
Note that in this case, the full operation is solely controlled by “Customer Control System”. CE+T shall not
be held liable for damage or harm caused to equipment or personnel due to incorrect system operation.
Refer to “ DOC – 00063 – App Note – Single Wire Microgrid Guide ” for additional details.