Woodward 2301E, Инструкция по установке и эксплуатации, Страница: 51 / 182

Manual 26641 2301E Digital Control
Woodward 41
Droop can also be accomplished by using the actuator output current, or Fuel
Demand to predict what the load is. This is called Actuator Position Droop. This
feature is enabled in the “N** LOAD SETTINGS **” menu. An actuator output at
no load fuel demand percentage, an actuator output at full load fuel demand and
an actuator droop percentage number is required for proper droop operation.
Isochronous Mode
Isochronous means repeating at a single rate or having a fixed frequency or
period. A generator 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 (see Figure 3-6). This mode can be used on one
generator set running by itself in an isolated system.
Figure 3-6. Isochronous Mode
The isochronous mode can also be used on a generator set connected in parallel
with other generator sets. Unless the governors are load sharing and speed
controls, however, 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 controls 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 the entire load or
from motoring.