HIMA F8621A Three control system module

HIMA F8621A Three control system module

Preset rated speed. If a signal generator is not used, set the RATED SPEED potentiometer at minimum (fully counterclockwise). When using a signal generator to set rated speed, set the signal generator for the frequency of the speed sensor at rated speed, and connect it to terminals 28 and 29. (The rated speed frequency in Hz equals the rated prime mover speed in rpm times the number of teeth on the speed-sensing gear divided by 60.) Put the Close For Rated contact in the rated (closed) position. Set the speed trim potentiometer, if used, to mid-position. Connect a dc analog voltmeter to terminals 20 (+) and 21 (–) to read actuator voltage. If the actuator voltage is at minimum (minimum will be approximately 0 volts), slowly turn the RATED SPEED potentiometer clockwise (counterclockwise for reverse-acting controls) until the voltage just begins to move to maximum.

If the actuator voltage is at maximum, slowly turn the RATED SPEED potentiometer counterclockwise (clockwise for reverse-acting controls) until the voltage just begins to move to minimum. Continue to very slowly adjust the RATED SPEED potentiometer in the appropriate direction, trying to stop the actuator voltage between the minimum and maximum voltages. Because it is not possible to stop the motion, cease adjusting when the voltage changes slowly. The RATED SPEED potentiometer is now set very close to desired speed. A slight adjustment when the engine is running will achieve the exact speed.

Check the speed sensor.

 Minimum voltage required from the speed sensor to operate the electronic control is 1.0 Vrms, measured at cranking speed or the lowest controlling speed. For this test, measure the voltage while cranking, with the speed sensor connected to the control. Before cranking, be sure to prevent the prime mover from starting. At 5% of the lower value of the control’s speed range, the failed speed sensing circuit is cleared. For example 100 Hz is required on the 2000 to 6000 Hz speed range (2000 Hz x 0.05 = 100 Hz). Be prepared to make an emergency shutdown when starting the engine, turbine, or other type of prime mover, to protect against runaway or overspeed with possible personal injury, loss of life, or property damage.

Adjust For Stable Operation

 If prime-mover operation is stable, go to the “Speed Setting Adjustment” procedure. lf 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 (turn the potentiometer clockwise) until the prime mover stabilizes. If increasing the RESET potentiometer 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.

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