PUMP GP-FUEL 3793460 - Caterpillar

KG30 Governor Control Unit
KG30 Governor Control Unit
(1) Diode. (2) Max fuel 5V potentiometer. (3) Stop 1.5V potentiometer. (4) Min speed potentiometer. (5) Max speed potentiometer. (6) Gain potentiometer. (7) Stability potentiometer. (8) Derivative potentiometer. (9) Gas-Gain potentiometer. (10) Gas-Diesel switch. (11) Start fuel limit potentiometer. (12) Start fuel limit slide switch. (13) Green LED light. (14) OV (-). (15) TP6 (+). (16) Droop potentiometer. (17) Droop-Isoch switch. (18) Speed variance potentiometer. (19) Fast response potentiometer. (20) Damping potentiometer.
KG30 Governor Control Unit
Earlier (Green Control Board)
KG30 Governor Control Unit
Later (White Control Board)The KG30 Governor Control Unit provides precision engine speed control. The system measures engine speed constantly, and makes necessary corrections to the engine fuel setting through an actuator connected to the fuel system.The engine speed is sensed by a magnetic pickup. As the teeth of the flywheel ring gear cuts through the magnetic lines of force around the pickup, an AC voltage is generated. The frequency of this voltage is directly proportional to engine speed. An electric circuit inside the governor control unit processes this AC voltage. In response it sends a signal from the control to the actuator to maintain the set speed.The actuator is connected to the fuel system by linkage. It changes the electrical input from the governor control unit to mechanical output that changes the engine fuel setting. For example, if the engine speed was greater than the speed setting, the governor control unit will decrease fuel to the engine.The Rated and Low Idle engine speeds are set with internal speed setting potentiometers. The engine speed is adjusted with a remote 10 turn potentiometer, or as a function of voltage, current or air pressure with an optional speed set point unit.The Gain, Stability and Derivative Potentiometers control the speed stability and the response time of the engine to a change in load. Gain affects the amount of speed deviation and recovery time. Stability affects rate of recovery, overshoot and response time for the Gain setting used. Derivative affects rate of speed deviation and thus response time to some degree, but is mainly for additional fine-tuning of engine stability.The Speed Droop Potentiometer controls the amount of speed droop. It can be set between 0 and 10%. Droop is only necessary when paralleling with a utility bus or a generator with a hydramechanical governor. When operating a generator set in droop where the LMG 03 Loadshare Unit is used, the KG30 Control Unit is put in Isochronous mode and the droop is set in the separate LMG 03 Loadshare Unit.The Start Fuel Limit Potentiometer is used to control the amount of fuel to the engine during startup. It can be adjusted to make the engine start easier, to decrease startup smoke and to limit startup overshoot. The fuel limiting function is turned off automatically when the speed control takes over.The speed failsafe circuit will drive the actuator to shutoff if the magnetic pickup signal becomes less than 150 Hz. Magnetic pickup failure or slow engine cranking will