Manual 26174 EGCP-2 Engine Generator Control Package
Woodward 123
Isochronous
Isochronous means repeating at a single rate or having a fixed frequency or
period. A generating set operating in the isochronous mode will operate at the
same set frequency regardless of the load it is supplying up to the full load
capability of the generator set, as illustrated in Figure 5-2. This mode can be
used on one generator set running by itself in an isolated system.
Figure 5-2. Isochronous Mode
The isochronous mode can also be used on a generator set connected in parallel
with other generator sets. Unless the generator set controls have the capacity for
load sharing and speed control, no more than one of the generator sets operating
in parallel can be in the isochronous mode. If two generator sets operating in the
isochronous mode, without load sharing capability, are tied together to the same
load, one of the units will try to carry the entire load and the other will shed its
entire load. In order to share load with other units, some additional means must
be used to keep each generator set from either trying to take or shed the entire
load.
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