71/78 SUREWAVE SFC USER MANUAL
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Remote AC bus Synchronization
The SureWave SFC can connect to a live AC bus using its in-built synchronizer. This allows unin-
terrupted power to an AC bus while transferring from alternate AC power sources such as
standby generators to the SFC.
The seamless transfer function is controlled by using the main controller digital I/O as described
in 9.2 I/O interfaces.
11.6.1 Transfer generator to SFC
11.6.1.1
Generator to SFC installation SLD
PEBBs
SureWave SFC
Main
Controller
GDM
Output Isolation
Transformer
3
3
3
3
External Voltage
Sense Board
Control I/O
Sync enable
Droop enable
Synchronized
AC Bus
Output CB
Generator CB
Figure 11-2: Seamless transfer from a generator to SFC
The installation and connection of the SureWave SFC to allow seamless transfer from a genera-
tor is shown in Figure 11-2: Seamless transfer from a generator to SFC.
Note, for proper operation the phase and voltage relationship between the voltages measured
by the external voltage sense and the inverter terminals must be known. A neutral is not re-
quired for the synchronizing function and if present, does not need to be connected to the ex-
ternal voltage sense board.
11.6.1.2
Generator to SFC transfer procedure
The procedure for transferring from generator to SFC is as follows. Please refer to the SureWave
commissioning manual for a complete detailed transfer procedure description.
