68/78 SUREWAVE SFC USER MANUAL
11.1.1.3
Stopping
Stop unload - When configured to share with droop or running fixed P and Q then the system
will first unload the SFC and hand load off to other generators, prior to stopping the inverters
Stop ramp 0 - If stopping in from and Isochronous mode, the system will ramp the output volt-
age down to 0 prior to stopping the inverters.
Stop Inverters - Disconnects and stops the inverters
Stop rectifiers - Disconnects and stops the rectifiers
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System start
To start the SureWave SFC the incoming supply needs to be present and the rectifiers AC termi-
nals to be energized. Hence, the user has to check the system state e.g., confirming input volt-
age is at required levels through the GDM.
Once the input voltage is within nominal conditions and no faults are present, the system can be
started via three sources:
GDM – Via “Dashboard” page, the SFC can be started with the press of one button.
Digital I/O – the SFC can be started after the “Start” digital signals is received.
Modbus TCP – The SFC can be started after the “Start” command is received.
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Operation modes
The SureWave SFC may have its output frequency and voltage controlled independently in a
number of different ways, depending on the application.
Stand-alone applications without any other generation equipment connected to the
load. This typically require the output frequency and voltage to be fixed.
Applications with a generator connected in parallel with the SureWave. This typically re-
quire the SFC to control its real power output by adjusting its output frequency. This
enables seamless handover of load between generator and the SureWave SFC.
Applications with more than one SureWave SFC in parallel to cover larger loads. Gener-
ally, the load sharing is successfully achieved by applying droop to the SureWave SFC
output voltage.
11.3.1 Stand-alone (VSI) operation mode
11.3.1.1
VSI-V/F
This mode is typically used when the SFC either stands alone or is the largest unit on a grid. In
this mode, the voltage and frequency are regulated very tightly in reaction to load changes.
