Woodward ProAct ITB

Integrated Actuator and Throttle Body

Part number: 8235-336, 8235-337, 8235-339

The ProAct™ Integrated Throttle Bodies (ProAct ITBs) are butterfly valves electrically-actuated by ProAct Analog and ProAct Digital Plus actuators to control flow output. With bore sizes ranging from 85 mm to 180 mm, these ProAct ITBs are designed for use with engines in the 1–2 MW range. The ProAct actuators are electromagnetic, 75 degree-of-travel devices, and therefore alleviate the problems associated with linkages on gas engines (such as setup, non-linearity, and wear).

This direct combination of throttle and actuator results in excellent stability and transient characteristics, and requires no hydraulics, pneumatics, or governor gear train. Therefore, you end up with an efficient, long lasting, and easily-installed throttle option.


Woodward ProAct integrated acutator and throttle body



The ProAct ITB integrated actuator and throttle body is designed to throttle air or air/fuel for gaseous engines. This system is designed for direct replacement of traditional throttle valves, and requires no linkage between valve and actuator. The three sizes are designed to cover a wide range of engines and should be selected using the sizing procedure described inside this specification.

Special features

• No linkage or couplings
• Cost effective and highly efficient
• Low maintenance
• Requires no hydraulics, pneumatics, or governor gear train
• Long lasting, easy to install throttle option
• Can be configured as an integrated speed controller or a positioner

Verified 2016 March

Woodward ProAct I and II

Digital Electric Powered Governor System

Part number: 8400-016



The ProAct™ digital control system is an electric powered governor system designed to provide precise electronic control and limiting for gas and diesel engines. ProAct I is designed for direct coupling to the butterfly valve shaft on small gas engines or for diesel engines which require less than 1.4 Nm (1.0 lb-ft) of torque to move the rack. ProAct II is designed for control of most diesel engines and larger carbureted gas engines.



Woodward ProAct I and II driver Digital Electric Powered Governor System


The ProAct control system is a combination of a 16-bit microprocessor control and a limited-angle rotational torque motor (actuator). The system features user-friendly menus to provide extreme flexibility in the development of special control schemes for different types of engines.

Two different ProAct actuators are available. The ProAct I actuator provides 1.4 Nm (1.0 lb-ft) of torque in steady state and 3.55 J (2.62 ft-lbs) of work over 75° of travel. The ProAct II provides 2.7 Nm (2.0 lb-ft) of torque in steady state and 7.11 J (5.24 ft-lbs) of work over the 75° of rotation.

The control has two complete sets of dynamic adjustments to aid when operating with such conditions as two different fuels, or in parallel/stand-alone electrical generation. A four-slope gain schedule is available in each set of dynamics. This permits programming for extremely responsive yet extremely stable operation of carbureted engines. Adjustment of the ProAct control is done through a hand held programmer. The programmer allows access to all of the tunable items. The programmer is separate from the control, and will normally be unplugged and removed during governor system operation. This provides security against unauthorized tampering with system adjustments. The control may be tuned or monitored with a PC rather than with the hand held programmer, if desired.

Standard Features

The ProAct digital electronics include settings for either droop or isochronous operation. Start, idle, and rated speeds may be set. Separate droop schedules are available for rated and idle. Variable speeds may be controlled by external input. The rates that the speed setting can be raised or lowered may also be adjusted. Fuel limits may be imposed for No Load, Full Load, Start-up (start-fuel limit), and Idle speed. A two-slope torque limit is available. Separate ramp times may be established for acceleration and deceleration. Speeds for rated, idle, raise limit, and lower limit are also easily preset.

Special features

• 75° rotary output allows direct coupling to butterfly, eliminating linkage

• All-electric actuator requires no drive or  hydraulic supply

• Programmable digital electronics permit tailoring control to various applications

• Actuators are extremely fast, electronically positioned in both directions

• Alternate dynamics for dual fuel applications or cogen/standby

• 3 speed-activated switches

• Start fuel limit and maximum fuel limit for derating

• Manifold pressure fuel limiting

• Two-slope torque limiting

Verified 2016 March

Woodward DSLC

Digital Synchronizer and Load Control


Woodward DSLC Digital Synchronizer and Load Control



The Woodward DSLC™ control is a microprocessor-based synchronizer and load control designed for use on three-phase AC generators  equipped with Woodward or other compatible speed controls and compatible automatic voltage regulators. The DSLC control is a  synchronizer, a load sensor, a load control, a dead bus closing system, and optionally a VAR/PF and process control, all integrated into  one powerful, yet convenient package. The DSLC control provides either phase matching or slip frequency automatic synchronizing.  The DSLC control talks over its own LON (Local Operating Network using Echelon LonWorks® * network technology) to enable safe dead bus closing, and ties into your automatic voltage regulator to match voltages before paralleling.

The DSLC control senses true RMS power and provides bumpless loading and unloading functions. It can either base load or set import/export/process power levels against the utility, and through the DSLC control’s LON, accurately share loads on isolated, multi- engine systems. The optional VAR/PF control is flexible enough to allow you either to provide a set level of VARs to the utility (if this is  economical) or to maintain a constant power factor for reliable operation. Through the LON, the VAR/PF control also shares power  factors in isolated systems, maintaining proportional reactive loads (kVARs) on all machines more accurately than droop or cross-current  voltage systems.

• Reduces wiring between synchronizer, load control and automatic loading controls
• Having functions integrated into one box eliminates the need for redundant sensors (like PTs, CTs, and MOPs) that connect to individual modules such as the load sensor and synchronizer
• Hand Held Programmer reduces installation and calibration time by allowing the user to set up the control prior to starting the system
• Hand Held Programmer lets operator monitor generator parameters, contact switches, and analog I/O for installation and troubleshooting
• Reduces the amount of cabinet space needed
• Eliminates the need for additional relay logic or a PLC to control dead bus closing
• Digital communications across the LON reduce susceptibility to noise on the load sharing lines
• Slip frequency paralleling, voltage matching, and speed bias transfer between the synchronizer and load control result in smooth  paralleling without the risk of reverse power trips
• Three-phase true RMS power sensing makes the DSLC control accurate even with unbalanced phase loading and voltage fluctuations
• Can load share with Woodward analog controls when used with the Load Sharing Interface Module (8239-082). Refer to Woodward Manual # 02031 for details.

• Synchronizer and load control in one box
• Automatic generator loading and unloading for bumpless load transfer
• Isochronous load sharing with other DSLC-equipped sets
• Process import/export control
• VAR or Power Factor control
• Dead bus closing
• Accurate control of non-linear and  distorted generator wave forms
• Digital communications network for information exchange between controls

Operating Modes
Isolated Bus—The DSLC control talks over its LON to share proportional real and reactive loads. Real load (kW) is controlled using  percentages of full load for each machine, and reactive loads (kVAR) are shared by matching power factors. The DSLC control maintains a specified bus voltage and frequency while balancing loads.
Utility Parallel—The DSLC control measures real load (kW) on the generator and adjusts the speed control to match a set base load, or to control a process at a user-chosen, externally adjustable set-point. It can be set to a constant import/export level using an MSLC ( Master Synchronizer and Load Control). The DSLC control can also measure and maintain a set reactive load (kVAR) or can maintain a user-prescribed power factor.
Transition Between Modes—The DSLC control will ramp at a user-chosen rate from one mode to another until the control is within 5%  of its target. It then shifts into dynamic control, allowing bumpless operating mode changes. In addition, the DSLC control automatically changes its VAR/PF mode when the real load mode is changed to or from an isolated load sharing application. Manual VAR/PF control may also be selected.


Verified 2016 March

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

Woodward 2301A

Load Sharing & Speed Control

Part number: 9907-028



Woodward 2301A load sharing and speed control



Woodward’s 2301A Load Sharing and Speed Control with temperature Limiting or Process Limiting is used in electric generator systems for which load sharing is desired. It can be used with diesel or gas engines, or steam or gas turbines, and is compatible with all Woodward electronic controls.


Rugged construction has been designed into the 2301A control for high reliability in adverse environments. Models for process limiting accept a  4–20 mA or 1–5 Vdc control signal. Models for temperature limiting accept a signal from a Type K thermocouple. Temperature Limiting and  Process Limiting controls are available for either low voltage or high voltage supply. Control of speed and load sharing requires, in addition to a  2301A control, a speedsensing device, an actuator, an external power source, and a means of sensing voltage and current. These  components make up a basic 2301A system. Additional devices such as Speed and Phase Matching Synchronizers, Import/Export controls, and Generator Loading Controls may be added.


The 2301A models offer many functional design features. These include:
• A wide dynamic adjustment range to accommodate a variety of prime movers, including diesel or gas engines, or steam or gas turbines.
• Protection from electromagnetic and radio frequency interference.
• An internal, isolated power supply for improved noise immunity and ground-loop protection.
• Low-voltage model: Once powered at 15 volts or above, the control will operate with a supply voltage as low as 9.6 volts and as high as 77 volts for up to five minutes, or 120 volts for 1/10 of a second without damage and with negligible control transients. Normal power is 20–45  Vdc.
• High -voltage model: The control will operate with a supply voltage as low as 75 Vdc (60 Vac) and as high as 200 Vdc (140 Vac) for up to five minutes, or 300 Vdc (212 Vas) for 1/10 second without damage, and with negligible control transients. Normal power is 90–150 Vdc or 88–132 Vac.

Special features

• Isochronous or droop speed control
• Isochronous load sharing
• Linear idle to rated speed ramp
• Automatic fuel limiting during starts
• 24 and 115 volt operation
• Wide dynamic adjustment range


Verified 2016 March