AD30 Underground Articulated Truck Machine Electrical System Speedometer/Tachometer Caterpillar


Speedometer/Tachometer
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Illustration 1g01001139

Speedometer/tachometer circuit

The components of the speedometer/tachometer circuit are the transmission output speed sensors, the Power Train/Chassis Electronic Control Module (Power Train/Chassis ECM), the primary speed timing sensor, the secondary speed timing sensor, the Engine Electronic Control Module (Engine ECM), the speedometer/tachometer module, and the AVSpare Monitoring System.




Illustration 2g00995567

Front view of cab (front cover plate removed)

(1) Power Train/Chassis ECM




Illustration 3g00997185

Left side view of engine

(2) Engine ECM




Illustration 4g00997186

Dash panel

(3) AVSpare Monitoring System

With the key start switch in the ON position, 24 volt power is supplied from the batteries via circuit breaker #12 to Power Train/Chassis ECM. 24 volt power is also supplied via circuit breaker #3 and circuit breaker #11 to Engine ECM and via circuit breaker #10 to AVSpare Monitoring System.




Illustration 5g00997187

Right side view of transmission

(4) Transmission output speed sensors




Illustration 6g00997189

Left view of engine

(5) Primary speed timing sensor

(6) Secondary speed timing sensor

Transmission output speed sensors (4), primary speed timing sensor (5) and secondary speed timing sensor (6) are magnetic sensors. An electric pulse is generated whenever a gear tooth interrupts the magnetic field. This signal is then sent to the relative ECM.




Illustration 7g00997192

Dash panel

(7) Speedometer/tachometer module

With the machine moving, the transmission output speed sensors generate a signal that is sent to Power Train/Chassis ECM (1). The machine ground speed is determined by the Power Train/Chassis ECM and sent to AVSpare Monitoring System (3) via the AVS Data Link. The AVSpare Monitoring System sends a signal to speedometer/tachometer module (7) to display the ground speed.

While the engine is running, primary speed timing sensor and secondary speed timing sensor generate a signal that is sent to Engine ECM (2). The Engine ECM calculates the engine rpm. The Engine ECM sends the signal via the AVS Data Link to the AVSpare Monitoring System. The AVSpare Monitoring System sends a signal to the speedometer/tachometer module to display the engine speed.

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