GE HE693ADC410A Gas turbine control card

Verify that the fuel rack is not binding and the linkage is properly adjusted. Determine if the fuel rack is quickly following the actuator input voltage. Verify proper operation of overspeed protection devices to determine if a shutdown is occurring without an overspeed condition. 2301A Speed Control. If the control does not cut back the actuator voltage when the speed setting is completely ccw the 2301A control may be faulty, or may have the wrong speed range. If the voltage is cut back, (increased on reverse acting controls) look for a problem in the linkage or actuator.

Prime mover overspeeds after operating at rated speed for some time.

Check for proper operation of prime-mover fuel system. If actuator moves toward minimum fuel during overspeed, problem is in fuel system. MPU and 2301A control. Check MPU voltage at speeds above idle (at least 1.0 Vrms). If MPU fails and the switch at terminal 4 is closed, the 2301A will call for maximum fuel. 2301A dynamics adjustment. Control the prime mover manually at rated speed and adjust the RATED SPEED setting fully ccw. If the output voltage is not zero, replace the control. (Voltage should be about 7 volts for 0-200 mA reverse acting controls or maximum current time actuator resistance for controls of other ratings.)

The Low Idle Speed setting

 may be below the minfuel position of the actuator or prime-mover fuel stop. In this case, the output voltage to the actuator will be zero (maximum for reverse acting controls). The engine will be maintained at the min-fuel position by the actuator or the prime mover min-fuel stop. The conditions indicate that the min-fuel position should be decreased by linkage adjustment (diesel) or low-idle set screw (gas engine), or the LOW IDLE SPEED setting should be raised. If this does not correct the problem, the 2301A control may be faulty. LOW IDLE SPEED potentiometer. If adjustment of the LOW IDLE SPEED potentiometer causes erratic behavior, replace the control.

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