PP836 3BDE042237R1 Touch screen operation steps

PP836 3BDE042237R1 Touch screen operation steps

Speed Setting Adjustment With the prime mover operating stably, and the external speed trim potentiometer (if used) set at mid-position, adjust the RATED SPEED potentiometer to bring the prime mover to the desired operating speed. Dynamic Adjustment The object of the GAIN and RESET potentiometer adjustment is to obtain the optimum, or desired, stable prime-mover-speed response. Connect a dc analog voltmeter to terminals 20 (+) and 21 (–) to monitor the actuator voltage. Adjusting the GAIN may cause momentary changes in speed which can be minimized by turning the GAIN potentiometer slowly.If the prime mover is slow in returning to the proper speed, decrease the RESET by turning the potentiometer counterclockwise.

Increasing the setting of the GAIN potentiometer 

provides faster transient response (decreases the magnitude of the speed change from a sudden change in load). To achieve optimum response, slowly increase the GAIN (turn the potentiometer clockwise) until the voltage on the voltmeter becomes slightly unstable, then slowly turn the GAIN back counterclockwise as necessary to stabilize the meter reading. Step load the generator, or bump the actuator terminal shaft, to make sure that the prime mover returns to the proper speed with little overshoot or undershoot of the speed setting. To reduce overshoot, increase the RESET (turn the potentiometer clockwise). When the RESET potentiometer is in the lower part of its adjustment (0 to 3 on the potentiometer scale), increasing the RESET clockwise may require decreasing the GAIN (turning the GAIN potentiometer counterclockwise) to maintain stable operation.

Figure 3-1 illustrates prime mover starts with the RAMP TIME potentiometer fully counterclockwise (no ramp—be careful not to overtorque the pot), step loadings at four different RESET potentiometer settings, and stable, steady-state running conditions. These are typical performance curves on a naturally aspirated (non-turbocharged) diesel engine.

Optimum performance is not necessarily obtained with the GAIN potentiometer at the maximum stable clockwise position. In some cases, the gain must be reduced slightly to ensure stability under widely varying conditions.

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