ADAPTER-SEAL 4W2566 - Caterpillar

Adjustment of the governor gains may be necessary for stable engine operation.The ECM uses the configuration parameter "Governor Type Setting" to select the type of ECM input utilized to determine an on or off grid operating status.For generator set engines there is one set of gains available:
Primary governor gainsThe primary governor gains are used to provide engine stability for the synchronization and engine stability.Primary governor gains for the applications:
"Governor (Proportional) Gain Percentage"
"Governor (Integral) Stability Percentage"The default values should be sufficient for initial start-up. However, the values may not provide optimum performance.These adjustments are provided to obtain optimum responses to changes in the load and in the speed. The adjustments also provide stability during steady state operation.If you have a problem with instability, always investigate other causes before you adjust the governor. For example, diagnostic codes and unstable gas pressure can cause instability.To change the parameters, use the "Real Time Graphing" feature on the "Information" drop-down menu of Cat ET. The graph provides the best method for observing the effects of your adjustments.For details on these parameters, refer to Systems Operation/Testing and Adjusting, "Electronic Control System Parameters".After you make adjustments, always test the stability by interrupting the engine speed and/or load. Operate the engine through the entire range of speeds and of loads to ensure stability.Note: Adjustment of the "Governor (Proportional) Gain Percentage" directly affects the speed of the throttle actuator during the correction between the actual engine speed and the desired engine speed. An excessive increase of this parameter may amplify instability.To set the "Governor (Proportional) Gain Percentage", increase the value until the actuator becomes unstable. Slowly reduce the value to stabilize the actuator. Observe that the engine operates properly with little overshoot or undershoot.The adjustment of "Governor (Integral) Stability Percentage" dampens the throttle actuator response to changes in load and in speed. Increasing this value provides less damping. Decreasing the value provides more damping. To adjust, perform the following:
To reduce overshoot, increase the value.
To reduce undershoot, decrease the value.Note: An increase of the "Governor (Integral) Stability Percentage" may require a decrease of the "Governor (Proportional) Gain Percentage" to maintain a stable operation.Illustration 1 shows some typical curves for transient responses.
Illustration 1 g01017530
(Y) Engine speed
(X) Time
(1) The "Governor (Proportional) Gain Percentage" is too high and the "Governor (Integral) Stability Percentage" is too low. There is a large overshoot on start-up and there are secondary overshoots on transient loads.
(2) The "Governor (Proportional) Gain Percentage" is slightly high and the "Governor (Integral) Stability Percentage" is slightly low. There is a slight overshoot on start-up but the response to transient loads is optimum.
(3) The "Governor (Proportional) Gain Percentage" is slightly low and the "Governor (Integral) Stability Percentage" is slightly high. There is optimum performance on start-up but slow response for transient loads.
(4) The "Governor (Proportional) Gain Percentage" is too low and the "Governor (Integral) Stability Percentage" is too high. The response for transient loads is too slow.
(5) The response to transient loads is adjusted for optimum performance.