Application

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.

 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

 Some may be configured as an integrated speed controller or a positioner

Determining the Proper Valve Size

The proper size valve can be determined using the equation below. The required Cv (flow coefficient)

should be calculated for both the minimum and maximum flows expected on the application. This design

allows for a nominal travel of 75 degrees of rotation.

Using the graph and table below, select the closest valve that has a Cv equal to or greater than the

calculated maximum flow value at approximately 80 % opening (60 degrees) to ensure reasonable flow

margin. Also, check that the particular valve’s minimum Cv listed below is less than the minimum

calculated Cv for good low idle performance.

For further assistance, consult the Woodward engineering department.

Description

The ProAct™ Integrated Throttle Bodies (ProAct ITBs) are butterfly valves

electrically actuated by ProAct 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 MW to 2 MW range. This is an electromagnetic actuator with

75 degrees of travel, which alleviates 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.

Using the graph and table below, select the closest valve that has a Cv equal to or greater than the

calculated maximum flow value at approximately 80 % opening (60 degrees) to ensure reasonable flow

margin. Also, check that the particular valve’s minimum Cv listed below is less than the minimum

calculated Cv for good low idle performance.

For further assistance, consult the Woodward engineering department.

Control

Speed: Dynamics maps are field selectable for either low speed (8–300 rpm) or high speed (300–2100

rpm).

Dynamics: Two menus for engine dynamics are switch-selectable for alternate fuel, alternate loads, etc.

Four different gain settings in each dynamics menu tailor governor response to various conditions

depending on load or non-linearity in the fuel control system.

Limiters: Limiters set minimum, idle, and maximum fuel settings, and minimum and maximum torque

schedules.

Two-slope torque limit schedule with program-selected breakpoint is available.

Speed Switches: Three speed switches are included with programmable on and off positions according to

engine speed. The switches may be used to indicate cranking, idle, rated, or overspeed operation. Switch

output is 500 mA when closed. Increase-speed trip points may vary from decrease-speed trip points.

Droop: Two droop schedules are available, with a programmable switch point between idle droop and

rated droop.

Speed Reference: Programmable minimum and maximum limiters with 4–20 mA remote reference to raise

and lower the rated speed. Rate of change of speed reference may be programmed with different rates

for raise and lower.

Specifications

Actuator

Output Shaft: 0.500-36 inch serration on output shaft. Opposite side used for feedback device. (Other

configurationsavailable upon request.)

Operating Temperature Range: –40 to +100 °C (–40 to +212 °F) operating environment. Contact

Woodward forextreme temperature installation procedures.

Feedback: Brushless Hall effect feedback device directly connected to actuator shaft.

Installation: May be mounted on 2.250 inch (57.15 mm) diameter male pilot concentric to the terminal

shaft usingfour bolts through the actuator or with four 0.312-18 inch bolts into the base (M8-6H metric

optional). The actuator may be mounted in any attitude.

May be connected directly to butterfly shaft, or may be linked to rack or valve.

Weight: The ProAct I and ProAct II actuators each weigh 6.9 kg (15.25 lbs).

Construction: All external surfaces are resistant to water and salt water corrosion. Actuator is waterproof

at normalwater hose pressure. Do not high-pressure wash.

Vibration and Shock Tested: Tested to US MIL-STD-810C.

MIN Fuel Return Spring: The actuator is equipped with a light spring return toward min fuel to prevent

drift in caseof position signal interruption. Normal operating conditions do not require spring return, as

the actuator is powered in both the increase and decrease directions.

Direction of Rotation: All models are capable of either clockwise or counterclockwise rotation to increase

fuel.

Description

Le système ProAct allie un contrôle par microprocesseur 16 bits à un moteur à

couple de rotation à angle limité (actuateur). Le système est pourvu de menus

faciles à utiliser afin d’assurer une extrême flexibilité de développement de

programmes spéciaux de contrôle pour les différents types de moteur.

Deux actuateurs ProAct différents sont disponibles. Le ProAct I délivre un couple

de 1.4 Nm (1.0 lb-ft) en fonctionnement normal et un travail de 3.55 J (2.62 ft-lb)

pour les rotations de 75°. Le ProAct II délivre un couple de 2.7 Nm (2.0 lb-ft) en

fonctionnement normal et un travail de 7.11 J (5.24 ft-lb) pour les rotations de 75°.

Le contrôleur dispose de deux jeux complets de paramètres dynamiques pour assister le fonctionnement en cas

de doubles carburants ou de génération de puissance parallèle/autonome. Un programme de gain à quatre

pentes est disponible pour chaque jeu de paramètres dynamiques. Cela permet d’effectuer une programmation à

réponse élevée et extrêmement stable de moteurs à carburateur. Le réglage du contrôleur ProAct s’effectue via le

Programmateur portable. Le programmateur autorise l’accès à tous les paramètres ajustables. Le programmateur

est indépendant du contrôleur. Il est normalement débranché et retiré lorsque le système fonctionne. Il est ainsi

possible d’interdire tout réglage non-autorisée des paramètres du système. Le cas échéant, le contrôleur peut

être ajusté et contrôlé par ordinateur personnel au lieu du programmateur portable.

Carctéristiques standard

Le circuit électrique numérique du ProAct inclus des paramètres pour les

applications statique ou isochrone. Il est possible de définir des vitesses de

démarrage, ralenti et nominales. Disponible avec programmation séparée des

statismes pour la vitesse nominale et le ralenti. Il est possible de varier la vitesse

via une entrée externe. La gamme de variation de vitesse (augmentation ou

diminution) peut également être réglée. Les limitations de carburant peuvent être

imposées pour les modes Charge nulle, Pleine charge, Démarrage (limitation

carburant au démarrage) et Ralenti. Une limitation de couple à deux pentes est

disponible. Des temps de rampe séparés peuvent être définis pour l’accélération et

la décélération. Les vitesses nominale, ralenti, limites haute et basse sont

également facilement définissables.

Applications

Le contrôleur numérique ProAct™ est un régulateur électrique destiné à assurer un

contrôle et une régulation électronique précise des moteurs à essence et diesel.

ProAct I est conçu pour un accouplement direct à l’axe de la vanne papillon

des petits moteurs à essence et des moteurs diesel demandant

un couple inférieur à 1.4 Nm (1.0 lb-ft) pour être actionnés.

ProAct II est conçupour le contrôle de presque tous les moteurs

diesel et les moteurs à essence à carburateur plus importants.

Carctéristiques standard

Le circuit électrique numérique du ProAct inclus des paramètres pour les

applications statique ou isochrone. Il est possible de définir des vitesses de

démarrage, ralenti et nominales. Disponible avec programmation séparée des

statismes pour la vitesse nominale et le ralenti. Il est possible de varier la vitesse

via une entrée externe. La gamme de variation de vitesse (augmentation ou

diminution) peut également être réglée. Les limitations de carburant peuvent être

imposées pour les modes Charge nulle, Pleine charge, Démarrage (limitation

carburant au démarrage) et Ralenti. Une limitation de couple à deux pentes est

disponible. Des temps de rampe séparés peuvent être définis pour l’accélération et

la décélération. Les vitesses nominale, ralenti, limites haute et basse sont

également facilement définissables.

Regulatory Compliance

European Compliance for CE Mark:

 EMC Directive:Declared to 89/336/EEC COUNCIL DIRECTIVE of 03 May 1989 on the approximation of

the laws of the Member States relating to electromagnetic compatibility.

Other European Compliance:

 Machinery Directive: Compliance as a component with 98/37/EC COUNCIL DIRECTIVE of 23 July 1998

on the approximation of the laws of the Member States relating to machinery.

Data files for subsequent

applications of the same engine model can be downloaded off-engine. The ProAct

Analog actuator/driver can be configured without a service tool.

Refer to manual 26112 for more detailed information on the ProAct Digital Plus

actuator, and to manual 26147 for more information on the ProAct Analog.

The Digital Plus driver is field programmable, allowing

a single design to be used in many different applications. It must be configured and

calibrated to the specific engine with a personal computer (PC) and a Woodward

Watch Window Service Tool that communicates serially to the driver via RS-232

using Woodward’s DDE ServLink protocol. 

Description

The actuators are designed to be base- or flange-mounted (Model IV is base

mounted only) in an on-engine environment and can therefore withstand high levels

of vibration and temperature extremes. They all have a 0.625-36 serrated tooth

terminal shaft, and an optional rotation scale and indicator are available for visible

travel detection. The actuators accept analog or PWM position command signals. In

addition, the Digital Plus driver accepts CAN position command signals and can be

configured for redundant command signals. It monitors all available 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 actuator.

Additional features of the Digital Plus driver include on-line and off-line diagnostics,

current limiting based on driver electronics temperature, CAN communications, and

service port communications. The Digital Plus driver is field programmable, allowing

a single design to be used in many different applications. It must be configured and

calibrated to the specific engine with a personal computer (PC) and a Woodward

Watch Window Service Tool that communicates serially to the driver via RS-232

using Woodward’s DDE ServLink protocol.

Agency Listings:

 CSA Certified for ordinary locations (Digital Plus only)

 CSA Class I, Division 2 component listing (standard with Analog; optional upgrade with Digital Plus)

 Marine Type Approved by Lloyds Register of Shipping for ENV1. ENV2. ENV3. and ENV4 (Digital Plus

only)

Customer Electrical Connections

ProAct Analog

The standard actuator is equipped with a 7-pin MS-style connector.

ProAct Digital Plus

The standard actuator is designed with a blank cover for use with a gland fitting or a custom connector to

be supplied by the customer. All inputs and outputs to the ProAct actuator are accessed beneath the end

cover, which is fastened with 6 M4x10 mm screws. Input power is connected to size M4 screws, and the

wires must be terminated with insulated spade or ring lugs. The I/O terminal blocks are screwless cage-

clamp-style blocks that accept wires from 0.20–3.3 mm² (24–12 AWG) wire.

Actuators with an MS-style connector mounted as an option on the end cover are also available. For

OEMs, other factory-installed connectors may also be considered.