WOODWARD 705 DIGITAL SPEED CONTROL FOR MECHANICAL DRIVE RECI Caterpillar

General Information

Usage:

Important Information

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Read this entire manual and all other publications pertaining to the work to be performed before installing, operating, or servicing this equipment. Practice all plant and safety instructions and precautions. Failure to follow instructions can cause personal injury and/or property damage.

The engine, turbine, or other type of prime mover should be equipped with an overspeed (overtemperature, or overpressure, where applicable) shutdown device(s), that operates totally independently of the prime mover control device(s) to protect against runaway or damage to the engine, turbine, or other type of prime mover with possible personal injury or loss of life should the mechanical-hydraulic governor(s) or electric control(s), the actuator(s), fuel control(s), the driving mechanism(s), the linkage(s), or the controlled device(s) fail.

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NOTICE

To prevent damage to a control system that uses an alternator or battery-charging device, make sure the charging device is turned off before disconnecting the battery from the system.

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NOTICE

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 (PCBs). * Do not touch the components or conductors on a PCB with your hands or with conductive devices.

Introduction

This manual describes the Woodward 705 Digital Speed Control, model 9906-106.

Application

The 705 Digital Speed Control controls the speed of mechanical-drive reciprocating engines. Control functions include:

* adjustable start fuel limiting;

* user-optional input from a 4-20 mA/1-5 Vdc turbo boost pressure transmitter for fuel rack limiting;

* 4-20 mA/1-5 Vdc input for remote speed reference;

* user-optional torque limiting based on engine speed;

* adjustable acceleration and deceleration times;

* adjustable low-idle droop;

* 4-20 mA auxiliary output;

* self diagnostics on power up.

The 705 control system includes:

* a 705 Digital Speed Control;

* an external 24 Vdc power source;

* a speed-sensing device;

* a proportional actuator to position the fuel rack;

* a terminal for adjusting control parameters;

* an optional 4-20 mA/1-5 Vdc transmitter for remote speed reference;

* an optional 4-20 mA/1-5 Vdc output turbo boost pressure-sensing device.

The 705 control (Figure 1-1) consists of a single printed circuit board in a sheet-metal chassis. All inputs and outputs connect to two terminal strips and a 9-pin subminiature "D" connector.