PLATE 1355434 - Caterpillar

Programming the Air/Fuel Ratio Control
The air/fuel ratio control must be programmed for the particular installation.For information on using Cat ET, refer to the information that is provided with the software.For information on using the DDT, refer to Special Instruction, SEHS9122, "Using the 7X-1400 Digital Diagnostic Tool (DDT) ".For information on the programmable parameters, refer to Systems Operation, "Electronic Control System Parameters".Recommendations for Programming Some of the Parameters
Gain for the Governor
For the governor gain, select a value of zero for the adjustments on initial start-up. These values should enable speed control, but the values may not provide optimum performance.After you adjust the governor, always test the governor stability by interrupting the engine speed. To interrupt the engine speed, use Cat ET or use the DDT. Test the ability of the governor to adjust to changes in the load. Operate the engine through the entire range of speeds and loads in order to ensure stability.Illustration 1 shows some typical curves for transient responses.
Illustration 1 g00806254
(Y) Engine speed (X) Time (1) The gain is too high and the stability is too low. There is a large overshoot on start-up and there are secondary overshoots on transient loads. (2) The gain is slightly high and the stability is slightly low. There is a slight overshoot on start-up but the response to transient loads is optimum. (3) The gain is slightly low and the stability is slightly high. There is optimum performance on start-up but slow response for transient loads. (4) The gain is too low and the stability is too high. The response for transient loads is too slow. (5) The response to transient loads is adjusted for optimum performance."AUX1 GOV GAIN" - To enable the proportional gain, stability, and compensation of the auxiliary governor, terminal 328 must be grounded to the − Battery side. A switch may be installed between terminal 328 and the − Battery side. When the switch closes terminal 328 to the − Battery side, the auxiliary governor gain is enabled. The status can be viewed on Cat ET or on the DDT. When the circuit is opened, the auxiliary governor is disabled and the primary governor is enabled."GOV P-GAIN" and "AUX1 GOV P-GAIN" - Slowly increase the proportional gain until the engine becomes slightly unstable. Slowly reduce the gain until performance is stable. If the gain is too low, the engine may have excessive overshoot. Overshoot can cause an engine shutdown during changes in load."GOV STAB" and "AUX1 GOV STAB" - If the engine is slowly hunting, increase the stability. If the adjustment does not stabilize the engine, slowly reduce the gain or increase the compensation."GOV COMP" and "AUX1 GOV COMP" - Raise the compensation until the throttle actuator becomes unstable or until the actuator reaches the maximum acceptable level of activity. After you raise the compensation, possibly raise the proportional gain. Use the compensation to achieve the most stable engine speed.Illustration 2 is a graphic representation of adjusting the compensation.
Illustration 2 g00806274
The increased width of the line for