MFR2S45B/EVC1 Woodward

Product Dimensions：

Electronic controls contain static-sensitive parts. Observe the 

following precautions to prevent damage to these parts:

• Discharge body static before handling the control (with power to 

the control turned off, contact a grounded surface and maintain 

contact while handling the control).

• Avoid all plastic, vinyl, and Styrofoam (except antistatic 

versions) around printed circuit boards.

• Do not touch the components or conductors on a printed circuit 

board with your hands or with conductive devices.

To prevent damage to electronic components caused by improper 

handling, read and observe the precautions in Woodward manual 

82715, Guide for Handling and Protection of Electronic Controls, 

Printed Circuit Boards, and Modules.

DYNA 8000, DYNA 8200, and DYNA 8400 governor systems provide engine

governing for speed and power control of piston and gas turbine engines or

steam and water turbines. The system components are a rotary actuator and an

electronic controller, both of which are described further in this manual.

ACTUATOR

The actuator consists of an electromagnet with an iron armature rolling on the

center shaft bearings. The actuator is provided with a return spring which

balances the magnetic force of the armature. When DC current flows in the coil,

the magnetic force moves the armature in the stator and this linear motion is 

transformed into rotary motion through a crank arm that forms part of the output

shaft.

CONTROLLER

The electronic controller is the information processing unit of the governor

assembly. It contains electronic components which process the input signal from 

the magnetic pickup to command the engine to the desired speed/RPM set into

the controller. Electronic adjustments are available on the controller for field

adjusting the unit as necessary.

DC POWER SOURCE

The governor system receives its power from a battery or an AC to DC power

supply supplying 12 or 24 Vdc ± 20% to match the governor voltage. The

average operating current consumption is 2.5A to 3.5A and the highest

consumption is 14.75A during engine start-up or during a large load change.

The power source must be rated above maximum stall current.

ISOCHRONOUS OPERATION

Isochronous operation is obtained by setting DROOP potentiometer fully 

counterclockwise. The DYNA governor is all electric, and it is normally operated in

the isochronous mode; i.e., engine RPM is constant (± 0.25%) under steady state

load conditions, up to the engine's maximum capability, regardless of load on the

engine

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