Speed Control
The Electronic Control Module (ECM) acts as a governor for the engine speed. The factors for the governor gain, the minimum stability, and the maximum stability can be adjusted by using Caterpillar Electronic Technician (ET). Refer to Systems Operation/Testing and Adjusting, "Engine Governing - Adjust".
The throttle signal to the ECM is a pulse width modulated signal (PWM). The ECM displays the throttle position as a percentage between 0 and 100 percent. The remote PWM signal is provided by the customer. The duty cycle of the PWM signal must be between 5 percent and 95 percent for a valid signal. The frequency of the PWM signal must be a frequency between 150 Hz and 1000 Hz.
A potentiometer that is mounted in the user interface panel can be used to send a signal to the customer speed control in order to allow local speed control of the engine. The potentiometer is available on the engine control panel. The potentiometer can be retrofitted as an option for the user interface panel.
Caterpillar Information System:
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