Woodward ProAct I, Product Manual

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Manual 04121 ProAct I/II
Woodward 5
Chapter 1.
General Information
Introduction
This manual describes the Woodward ProAct™ 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. The ProAct II provides 6.8 J (5.0 ft-lb)
of work (transient) and 2.7 N·m (2.0 lb-ft) of torque.
The ProAct I is extremely fast and provides 3.4 J (2.5 ft-lb) of work (transient)
and 1.4 N·m (1.0 lb-ft) of torque at steady state. ProAct I controls may be
operated on nominal 12 Vdc systems. ProAct II controls require nominal 24 Vdc
supply.
Larger output ProAct III and ProAct IV controls are available. Information on
these actuators is in manual 04127.
The ProAct Digital Speed 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. A fuel limiting version is also available.
The ProAct control system includes:

a ProAct Digital Speed Control

an external 18–32 Vdc (24 Vdc nominal) power source for Model II or a 10–
32 Vdc power source for Model I

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 Digital Speed Control (Figure 1-2) consists of a single printed circuit
board in a sheet metal chassis. Connections are via two terminal strips and a 9-
pin J1 connector.
The control chassis has an aluminum shield to protect the circuits from
electromagnetic interference (EMI) and electrostatic discharge (ESD).