IN0020
Revision 05
004799
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POWER PERFORMANCE PASSION
Installation Notes
Operation
The Grid Fail - Generator Backup (GFGB) functions as follows:
1.
When the grid is available and in tolerance the grid is connected via the GFGB contactor
to the SP PRO and the SP PRO synchronises to the grid as per normal Solar Hybrid
Operation.
2.
When the grid fails, or is out of voltage or frequency tolerance (as per the settings in the
SP PRO), the SP PRO will disconnect from the grid via the SP PRO AC source contactor.
At this stage, the GFGB contactor is keeping the SP PRO attached to the grid supply, and
if the grid is restored then the SP PRO will again synchronise to the grid.
3.
The SP PRO will continue to power the loads from the battery bank and any connected
renewable energy until the grid is restored.
4.
If the grid is not restored before a “Generator start” condition, the SP PRO will
automatically start the generator and switch over the GFGB contactor to connect the
SP PRO AC source input to the generator supply. The SP PRO will then synchronise to
the generator to charge the batteries and power the loads.
5.
When the “Generator Stop” condition is satisfied, the SP PRO stops the generator and
continues to run from the battery and any connected renewable energy. This cycle will
continue until the grid is restored.
6.
When the grid is restored and stable for 60 seconds, the SP PRO will stop the generator
(if it is running and has been running longer than the “Minimum Runtime” in
Configuration Settings>AC Source>Generator Controller Settings), disconnect its AC
source contactor then switch over the GFGB contactor to return the SP PRO to the grid.
The SP PRO will then synchronise to the grid.
Note: The GFGB contactor is a break before make changeover contactor. This ensures that the
generator supply and grid supply cannot be cross connected.
