SHANK AS-RIPPER 4T0134 - Caterpillar

Introduction
The Woodward Flo-TechTM Speed Control provides precise speed control of an engine with separate dynamics for stable, responsive engine operation at rated and idle speeds.Electronic Circuits
All circuits in the Flo-Tech Speed Control are solid state and are not serviceable in the field. The printed circuit board is manufactured by Woodward to provide maximum tolerance to temperature and vibration. Components are wave soldered to the board, and the circuits are computer-tested to assure maximum dependability and accuracy.Potentiometers, accessible through the control-box case or input through the terminal board, provide all adjustments to the control system. A 10-turn potentiometer provides precise adjustment of the rated-speed setting. One-turn potentiometers provide adjustment for rated speed, fuel limit, idle or unloaded gain and stability, and rated or loaded gain and stability. In addition, the control can be fitted with external potentiometers to set the idle speed and to trim the rated speed from a remote location.Speed Control
The control converts the signal from the magnetic pickup on the engine into a dc voltage level which is proportional to engine speed. This voltage level is compared to the rated or idle speed setting. After the speed error is modified by GAIN, STABILITY, and SPEED TRIM, the result is sent to a driver that provides 0-200 mA to the Flo-Tech Throttle installed on the engine.Stability and Gain
The stability and gain adjustments on the Flo-Tech Speed Control allow tailoring of the response rates at idle and at rated speeds to match the engine being controlled.STABILITY adjustments affect engine reaction time when recovering after a sudden load change. The magnitude of the speed change resulting from a sudden change in load is controlled by the GAIN adjustments.Start Fuel Limit
A one-turn pot is available to set a start-fuel limit. The Start Fuel Limit provides a maximum fuel flow until the engine is at idle or rated speed, as selected. When the fuel-limit potentiometer is set fully counterclockwise, the valve will go to a low-fuel position until selected speed is reached. Fuel limiting can prevent smoke during startup, can aid starting on some types of engines, or can be used to prevent excessive overspeed as an engine reaches rated or idle speed. Fuel limit is automatically enabled when the MPU signal falls to zero, and disabled just before the engine reaches idle or rated speed.Failed Speed Sensor
A safety circuit is included in the Flo-Tech Speed Control to cause the throttle to go to minimum position if the signal from the magnetic pickup is lost. This is protection against loss of control should either the magnetic pickup instrument or the wiring from the magnetic pickup to the control fail. Without this safety circuit, the valve would go to maximum or to the fuel limit should the control lose the magnetic pickup signal.Auxiliary Input
The auxiliary input is provided to allow the Flo-Tech Speed Control to be used with a load sensor or other auxiliary device such as a process control or SPM-A. A Load Sensor is used with the control for isochronous