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Load removal
rpm
Load application
Fig. 6 Requested response
4. Select "High" or "Low".
5. Run the engine at the working speed and working
6. If the engine is still unstable, increase/reduce the D
NOTE: The few times that the D-value may need to be
Requested engine
adjusted include cases where the application has a flexi-
speed
ble coupling or extremely low flywheel inertia.
time
High: when one is far from the nominal engine
speed, i.e. to improve load response.
Low: when one is close to the nominal engine speed
point, i.e. to increase stability.
temperature.
In cases where the engine needs to be adjusted, in-
crease or reduce the values of the P and I sections
until unstable (oscillating) engine speed is obtained.
Then increase/decrease the parameters until the en-
gine speed is stable again.
section until engine speed only increases slightly
when load is applied (or removed), please refer to
figure 6.
27
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