SECTION 2.00 SPEED GOVERNING SYSTEM DESCRIPTION SPEED GOVERNING SYSTEM DESCRIPTION F18/H24 GOVERNOR

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Governor actuator (if equipped) Governor linkage and regulator shafts Magnetic pickup unit (required with EG3P and 4024) F18/H24 GOVERNOR The governor is located on the front gear housing.

1 SECTION 2.00 SPEED GOVERNING SYSTEM DESCRIPTION SPEED GOVERNING SYSTEM DESCRIPTION The engine speed control system consists of the following engine mounted components: Governor Governor drive (if equipped) Governor actuator (if equipped) Governor linkage and regulator shafts Magnetic pickup unit (required with EG3P and 4024) F18/H24 GOVERNOR The governor is located on the front gear housing. The governor controls the engine rpm by controlling the amount of air/fuel supplied to the engine. The governor speed control can be isochronous, which means that the governor will maintain a constant engine rpm regardless of load within the capacity of the engine. The governor speed control can also operate in a droop mode which means that the governor will allow the engine to slow down slightly under load. This allows for more stable governor operation. The engine may also be equipped with one of the following governors: 4024 EPG governor (Electrically Powered Governor) (see Figure ) PSG (see Figure ) EG3P electro-hydraulic governor actuator (see Figure ), which can use any of the following control boxes: 2301 Droop speed control 2301A Isochronous load sharing control Figure Electric Governor Figure PSG Governor FORM 6284 Third Edition

governor terminal shaft, through a rod assembly attached to a shaft assembly to the throttle

00-5 Governor Linkage QUICK START OIL SUPPLY An optional oil supply is available for quick

The oil reservoir provides instant throttle response upon crank initiation.

2 Figure EG3P Governor GOVERNING LINKAGE PSG and EG3P governor action is transmitted from the governor terminal shaft, through a rod assembly attached to a shaft assembly to the throttle butterfly (see Figure ). Figure Governor Linkage QUICK START OIL SUPPLY An optional oil supply is available for quick start applications with EG3P and PSG governors. The oil reservoir provides instant throttle response upon crank initiation. A filter element is used as an oil reservoir (see Figure ). Replace the filter element every 6 months. Figure Governor Rod The 4024 governor actuator rod attaches directly to the throttle butterfly shaft (see Figure ). Figure F18/H24 Quick Start Oil Supply FORM 6284 Third Edition

GOVERNOR THROTTLE CONTROL A governor throttle control is available as an option for SG and PSG governors (see Figure 2.00-7).

00-7 Governor Throttle Control L36/P48 GOVERNOR NOTE: Modifications are available that will improve cold start response for engines equipped with hydraulic governors

The governor is mounted next to the throttle valve housing located on the rear gear housing.

The governor speed control can be isochronous, which means that the governor will maintain a constant engine rpm regardless of load.

3 GOVERNOR THROTTLE CONTROL A governor throttle control is available as an option for SG and PSG governors (see Figure ). Woodward EG3P governor actuator uses either control box (see Figure ): 2301 Droop speed control 2301A Isochronous load sharing control Figure Governor Throttle Control L36/P48 GOVERNOR NOTE: Modifications are available that will improve cold start response for engines equipped with hydraulic governors in generator applications. See Service Bulletin (or current revision), Improving Governor Cold Start Response. The governor is mounted next to the throttle valve housing located on the rear gear housing. The governor controls the engine rpm by controlling the amount of air/fuel supplied to the engine. The governor speed control can be isochronous, which means that the governor will maintain a constant engine rpm regardless of load. The governor speed control can also operate in a droop mode, which means that the governor will allow the engine to slow down slightly under load. This allows for more stable governor operation. The following governors are used on VGF engines: Woodward 4024 electric governor (see Figure ). Figure EG3P Governor PSG governor (see Figure ). Figure PSG Governor Figure Electric Governor FORM 6284 Third Edition

GOVERNOR DRIVE (IF EQUIPPED) The governor is driven from the camshaft idler gear through a gear on the input shaft of the governor (see Figure

AIR ACTUATOR FOR PSG GOVERNORS The engine may also be equipped with a PSG hydraulic lever controlled governor which can use the speed control

00-11 Governor Drive GOVERNOR LINKAGE GOVERNOR LINKAGE Governor action is transmitted from the governor terminal shaft to the throttle

4 GOVERNOR DRIVE (IF EQUIPPED) The governor is driven from the camshaft idler gear through a gear on the input shaft of the governor (see Figure ). External oil lines supply the governor drive with lubricating oil. AIR ACTUATOR FOR PSG GOVERNORS The engine may also be equipped with a PSG hydraulic lever controlled governor which can use the speed control air actuator (see Figure and Figure ). Figure Governor Drive GOVERNOR LINKAGE GOVERNOR LINKAGE Governor action is transmitted from the governor terminal shaft to the throttle butterfly, through a rod assembly (see Figure ). AIR ACTUATOR Figure F18/H24 Governor Air Actuator GOVERNOR LINKAGE Figure Governor Linkage AIR ACTUATOR Figure L36/P48 Governor Air Actuator A signal from a pneumatic supply pressurizes the governor speed setting mechanism. The speed is determined by the amount of air pressure that is supplied to the actuator. Typical pneumatic pressure range is 3 to 15 psi (20.7 to kpa). Governors operating at these pressures will control the engine speed between 1000 and 1800 rpm FORM 6284 Third Edition

5 CONTROL PANEL The control unit (see Figure and Figure ), used with electric units, is mounted off-engine, usually in the control room, and is the device that receives the signal that is sent from the magnetic pickup. The control unit then compares the magnetic pickup signal to the predetermined engine rpm signal through circuitry and makes the proper adjustments through the actuator. The engine rpm is set with the rated speed potentiometer located on the control unit, or by the optional external speed trim potentiometer. The rpm setting voltage is compared at the control unit between the control amplifier voltage and the rpm voltage. The control amplifier sends an appropriate voltage to the actuator. For example, if the speed was greater than the speed setting, the control amplifier would decrease its output and the actuator would decrease fuel to the engine. Load sharing between two or more engine generator sets is accomplished via the load sensing circuitry. Each generator's load is electronically measured continuously to other units on the same bus via parallel lines. Continuous correction to control loop gives load sharing. Figure A Load Sharing And Speed Control Figure A Speed Control FORM 6284 Third Edition

Reference Manual. Governing Fundamentals and Power Management. This manual replaces manuals and Manual 26260

Reference Manual. Governing Fundamentals and Power Management. This manual replaces manuals and Manual 26260 Reference Manual Governing Fundamentals and Power Management This manual replaces manuals 01740 and 25195. Manual 26260 Woodward Governor Company reserves the right to update any portion of this publication