SCREEN AS 3G2892 - Caterpillar

The responses of the electrohydraulic actuators can be individually adjusted by using the Caterpillar Electronic Technician (Cat ET) to change these three parameters:
Gain
Stability
CompensationThese adjustments are provided in order to obtain optimum responses to changes in the load and in the speed. The adjustments also provide stability during steady state operation.Note: Adjustment of the gain directly affects the speed of the fuel actuator when there is a difference between the actual engine speed and the desired engine speed. An excessive increase of the gain may amplify instability.To set the gain, increase the gain until the actuator becomes unstable. Slowly reduce the gain in order to stabilize the actuator. Use Cat ET to bump the engine speed. Observe that the engine operates properly with little overshoot or undershoot.The adjustment of stability dampens the actuator's response to changes in load and in speed. Increasing the stability provides less damping. Decreasing the stability provides more damping. To reduce overshoot, decrease the stability. To reduce undershoot, increase the stability.Note: An increase of the stability may require a decrease of the gain in order to maintain a stable operation.Note: Adjustment of the stability directly affects the damping of the fuel actuator. An excessive increase of the compensation may amplify instability.Decrease the compensation until a slow, periodic instability is observed. Then, slightly increase the compensation. Repeat the adjustments of the gain and of the stability. Continue to increase the compensation and readjust the gain and stability until stability is achieved and the engine's response to changes in load and in speed is optimized.Note: The default setting of gain, of stability, and of compensation is 100 percent. The range is 0 percent to 3200 percent. To reduce the responses of the parameters, reduce the value. To increase the responses, increase the values.Governor Type
Use Cat ET to select the "Governor Type Setting" configuration parameter.For generator set applications, there are two sets of responses for the fuel actuator. The "Isochronous Mode" is used to provide "off grid" engine stability for synchronization. The "Droop Operation" is for "on grid" stability. Adjustment to the settings for the fuel actuator relates to both of the responses.Adjustments for the Hydraulic Oil Pressure
To operate properly, the electrohydraulic actuators require correct oil pressure. If the pressure is insufficient, the engine will not start. If the pressure is excessive, the hydraulic system can be damaged. Two adjustments can be made for the hydraulic oil pressure:
The hydraulic lines have a pressure relief valve that regulates the hydraulic system's pressure. This pressure relief valve is adjusted in order to achieve sufficient pressure for start-up and for normal operation. If the pressure becomes excessive, the valve diverts the oil back to the pump.
The hydraulic oil pump has a pressure relief valve that is a backup to the pressure relief valve in the hydraulic lines. If the pressure becomes excessive, the pump circulates the oil internally.Adjustment of the Hydraulic Lines' Pressure Relief Valve
Table 1
Tools Needed Qty
8T-0855 Pressure Gauge 1
Illustration 1 g00917032
Left side view (In-line engine)
(1) Plug
Illustration 2 g00897160
Rear view (In-line engine)
(2)