Installation Manual

Component Installation

Twin Disc, Incorporated

Speed Sensor Installation

Applications with options such as Sync Mode (engine synchronization), Express

Mode, and Troll Mode require the installation of an engine speed sensor and/ or transmission output speed sensor. Engine speed sensors (transmission input) are most often installed on the marine transmission, however in some cases the engine speed sensor is installed on the engine flywheel. The output speed sensor may be installed directly into the transmission or on a bracket near the output shaft with a speed pick-up wheel connected to the output flange.

Only Twin Disc speed sensors are acceptable for the output shaft speed.

There are many types of engine speed sensors available and many will work with the EC300 Control System. This section outlines the installation of the sensors available from Twin Disc Incorporated. Contact Twin Disc, or the nearest distributor, for the possible use of other sensors.

The Speed Sensor is a cylindrical-threaded component that screws into either the engine flywheel housing; the transmission housing; or into a bracket on the output side to sense transmission output speed. It is triggered by the crown of the gear teeth when they pass in close proximity to the end of the speed sensor.

The Speed Sensor produces an output signal of one pulse per gear tooth. The

EC300 Control software converts the individual pulse signals into revolutions per minute (rpm). The number of teeth on the gear must be known in order for the software to be properly configured. This information is either supplied by the engine supplier if flywheel mounted, or Twin Disc Incorporated if connected to transmission.

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Twin Disc, Incorporated

Component Installation

Single output speed sensors are preferred over dual output (See Figure 10); however dual output speed sensors are acceptable if the outputs are electrically isolated from each other and have the required electrical characteristics.

SINGLE OUTPUT

DUAL OUTPUT

Figure 10. View of Typical Single and Dual Output Speed Sensors

The following sub-sections make up this section.

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Installation – Magnetic Pick-up Engine Speed Sensor

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Installation – Hall Effect Pick-up Output Speed Sensor

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Installation – Tachometer Signal Generator

EC300 Marine Control System Installation Manual #1024168

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