PROACT DIGITAL SPEED CONTROL SYSTEM FOR MODELS I & II

General Information

Usage:

Introduction

This manual describes the Woodward ProAct^TM Digital Speed Control and ProAct 75 degree electric powered actuators models I and II.

Application

The ProAct control system is designed to control the speed of engines in mechanical drive or generator set service. The electric powered ProAct actuator has 75° of rotation and is designed for direct drive of the butterfly valve on gas engines, and through linkage the racks on diesel engines.

Actuators are available in different sizes to fit specific control demands. In most cases the ProAct II actuator will be used. ProAct II provides 5.0 ft-lbs of work (transient) and 2.5 ft-lbs. at steady state.

ProAct I is extremely fast and provides 2.5 ft-lbs. of work (transient) and 1.25 ft-lbs. at steady state. ProAct I controls may be operated on nominal 12 volt systems. ProAct II controls require nominal 24 Vdc supply.

Larger output ProAct III and ProAct IV are available. Information on ProAct III and IV is included in manual 04127.

The ProAct control includes an input for a 4 to 20 mA remote speed reference setting, an internal speed reference for local control of speed, and an auxiliary voltage input for load-sensor connection in load-sharing applications.

The ProAct control system includes:

* a ProAct Digital Speed Control;

* an external 18-32 Vdc (24 Vdc nominal) power source for Model II. Model I requires 8-32 Vdc power.

* a speed-sensing device (MPU);

* a ProAct I or ProAct II actuator to position the fuel rack;

* a hand held terminal for adjusting control parameters;

* an optional load sensing device.

The ProAct control (Figure 1-5) consists of a single printed circuit board in a sheet-metal chassis. Connections are via two terminal strips and a 9-pin subminiature D connector.

The control chassis has a steel shield to protect the circuits from Electromagnetic Interference (EMI) and ElectroStatic Discharge (ESD). A cover is available to additionally shield the terminal connectors. Conduit connections are provided on the sides of the chassis for Class 1, Div 2 environments.

Control Applications

The ProAct II control (9905-463) requires 18-32 Vdc (24 Vdc nominal) uninterrupted power supply, with 23 watts as the maximum power consumption at rated voltage. ProAct I (9905-462) requires 8-32 Vdc (12 or 24 Vdc nominal) uninterrupted power supply with 350 watts as the maximum power consumption at rated voltage.

ProAct actuators are designed to directly link to the butterfly in the gas engine carburetor. The control can be programmed to have variable gain to compensate for the variable gain characteristics of carbureted gas engines.

Diesel engine applications can use the control programmed to accommodate non-linear fuel controls or non-linear linkage arrangements.

The control is designed to control applications from gensets to compressors that require the use of an electric actuator.

ProAct Digital Speed Control Accessories

Hand Held Programmer (Figure 4-8), part number 9905-292, is used to adjust the ProAct control. It plugs into the serial port (D connector) of the control.

Generator Load Sensor (8290-048), for load sharing or droop-parallel generator applications. This will connect to terminals 12 and 13 on the control.

SPM-A Synchronizer, for synchronizing the generator phase to that of the power bus. The synchronizer generates a close-generator-breaker signal to parallel the generator with the power bus. Connect the Synchronizer to terminals 12 and 13 to bias speed setting.