4.2.2.2 SYNCHROSCOPE OPERATION
Note: If the module display is showing the status page when the synchronising process
begins, the module automatically switches to the Synchroscope page. The ramp progress will
also be displayed on the screen once paralleling has taken place.
Initially the synchroscope display shows the
difference between the mains and generator bus
supplies. Here the display is showing a frequency
mismatch of +0.9 Hz and a voltage mismatch of
+0.2 V. The generator bus frequency is too high
(indicated by the arrow) and must be reduced.
The voltage is high, but is within the limits set for
synchronising (indicated by the tick).
When both the frequency and the voltage
differences are within acceptable limits, the
phase matching begins. Then the moving bar
shows the phase difference between the two
supplies. The bus frequency is automatically
adjusted, altering the phase, until the moving bar
enters the centre of the scope.
Once the mains and generator bus supplies are
in sync, the module initiates a breaker close
signal to the bus load switch closing the bus onto
the mains. If synchronism is broken the moving
bar will pass out of the synchronising window and
the Out of Sync alarm activates. .
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