SCREEN ASSEM. 6J9403 - Caterpillar

2301 Electric Governor System
The 2301 Electric Governor Control System consists of the components that follow: 2301 Electric Governor Control (EGC), Actuator, Magnetic Pickup, and an optional Preregulator.The 2301 Electric Governor System gives precision engine speed control. The 2301 Control 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 felt by a magnetic pickup. This pickup makes an AC voltage that is sent to the 2301 Control. The 2301 Control now sends a DC voltage signal to the actuator.The actuator changes the electrical input from the 2301 Control to a mechanical output that is connected to the fuel system by linkage. For example, if the engine speed is more than the speed setting, the 2301 Control will decrease its output and the actuator will now move the linkage to decrease the fuel to the engine.
2301 LOAD SHARE CONTROL (Parallel Unit)
2301 STANDBY CONTROL (Nonparallel Unit)
MAGNETIC PICKUP LOCATION ON EARLIER 3500 ENGINE
1. Magnetic pickup.
MAGNETIC PICKUP LOCATION ON LATER 3500 ENGINE
1. Plug (one of three available locations on top of flywheel housing).
ACTUATOR LOCATION ON 3500 ENGINE
2. EG-10PC Actuator.
BASIC 2301 LOAD SHARING SYSTEM
BASIC 2301 STANDBY SYSTEMMagnetic Pickup
SCHEMATIC OF MAGNETIC PICKUPThe magnetic pickup is a single pole, permanent magnet generator made of wire coils around a permanent magnet pole piece. As the teeth of the flywheel ring gear go through the magnetic lines of force around the pickup, an AC voltage is made. The ratio between the frequency at this voltage and the speed of the engine is directly proportional.This engine speed frequency signal (AC) is sent to the 2301 Control Box where a conversion is made to DC voltage. The DC signal is now sent on to control the actuator, and this voltage is inversely proportional to engine speed. This means that if engine speed increases, the voltage output to the actuator decreases. When engine speed decreases, the voltage output to the actuator increases.2301 Nonparallel (Standby) Control Box
The Rated and Low Idle engine speed are set with speed setting potentiometers. An optional remote Speed Trim potentiometer will give approximately 6% speed setting adjustment.The Gain and Stability Potentiometers control the response of the engine to a change in load. Increased gain is used to get a faster response time. The Stability Potentiometer is used to get the best speed stability for the gain setting that is used.A capacitor can be used between terminals T15 and T16 to control the amount of time it takes the engine to go from Low Idle to Rated Speed.
WIRING DIAGRAM FOR 2301 NONPARALLEL CONTROL BOX (8N408)A Droop Potentiometer can be connected between terminals T13, T14 and T15 to control the amount of speed droop. Droop is necessary when paralleling with a utility bus, or a unit with a hydra-mechanical governor.An oil pressure switch is connected between terminals T9 and T10. This switch will not permit the control box to accelerate the engine to Rated speed if there is not enough engine oil pressure