Woodward ProAct ISC

Integrated Speed Control



Woodward ProAct actuator Integrated Speed Control


The ProAct™ Integrated Speed Control (ISC) is an electric actuator with an integrated electronic driver capable of diesel or gaseous engine speed control or positioning tasks. The ProAct ISC can be mounted on-engine to control a diesel fuel rack or gaseous throttle via linkage or  integrated throttle body. The ProAct ISC accepts a speed input from an MPU and can accept a position command signal from another device in the system such as an engine control module. Configured as a speed control, the ProAct ISC offers speed control with softwares electable
speed set points, dynamics, fuel limiting, and start/stop behavior. Configured as a positioner, the ProAct ISC offers position control with  software selectable CW/CCW operation and field calibration.


The ProAct ISC can be base- or flange-mounted on-engine, and will withstand high levels of vibration and temperature. The output shaft is a  0.625-36 serrated tooth shaft. Four levels of output torque are available. The ProAct ISC will also mount directly to Woodward integrated  throttle bodies. The control accepts a speed input signal from a variable reluctance speed sensor, commonly called an MPU. The control may  also be user-configured as a positioner accepting an analog position command signal or a J1939 CAN demand signal. Future options will include a CANopen communication capability.

The ProAct ISC offers a wide variety of speed control features: Dynamics settings, dual rated speed  setting, idle/rated speed setting, raise or lower speed modifier, analog input speed modifier, analog raise and lower speed modifier, droop, dual dynamics, analog outputs, and discrete outputs. The control also allows isochronous load sharing, and monitors key internal and external  signals, and annunciates any detected faults through a discrete output. An analog output provides actual position indication, and a discrete  input is available to remotely shut down the control.

Additional features of the ProAct ISC include on-line and off-line diagnostics, current limiting based on driver electronics temperature, and service port communications. The control is field programmable, allowing a single design to the used in many different applications. It must be configured and calibrated to the specific engine with a personal computer (PC) and the  ProAct ISC Service Tool that communicates serially to the control via RS-232 using Woodward’s DDE ServLink protocol.

Verified 2016 March