ABB UCD224A102 3BHE023681R0102 Dc power supply card

Adjust for Stable Operation If prime-mover operation is stable, go to the "Speed Setting Adjustment" procedure. If the prime mover is hunting at a rapid rate, slowly decrease the gain (turn the potentiometer counterclockwise) until performance is stable. Adjusting the gain may cause a momentary speed change which can be minimized by turning the gain potentiometer slowly. If the prime mover is hunting at a slow rate, increase the RESET setting (turn the potentiometer clockwise) until the prime mover stabilizes. If increasing the RESET potentiometer setting does not stabilize the prime mover, it also may be necessary to either: • Slowly decrease the GAIN (turn the potentiometer counterclockwise) or • Slowly decrease the GAIN and increase the ACTUATOR COMPENSATION.

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 adjustments is to obtain the optimum, or desired, stable prime-mover-speed response. Adjusting the GAIN may cause momentary changes in speed which can be minimized by turning the GAIN potentiometer slowly.

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 actuator becomes slightly unstable, then slowly turn the GAIN back counterclockwise as necessary to stabilize the actuator. 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 setting (turn the potentiometer clockwise). When the RESET potentiometer is in the lower part of its adjustment (0 to 3 on the scale), increasing the RESET clockwise may require decreasing the GAIN (turning the GAIN potentiometer counterclockwise) to maintain stable operation. If the prime mover is slow in returning to the proper speed, decrease the RESET by turning the potentiometer counterclockwise.

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