GEAR 1W9812 - Caterpillar

Illustration 1 g00474634
Analog to PWM Converter (1) Droop potentiometer.The electrical converter is used to change the analog signal of the speed potentiometer into a pulse width modulated signal. The engine electronics can now recognize the PWM signal. The electrical converter is mounted on the subpanel within the control panel.The electrical converter continuously generates two PWM signals, speed and droop. The duty cycle of the speed cycle varies from 2% to 95% in proportion to the signal that is being received from the speed potentiometer. This is adjusted by the operator. The duty cycle of the droop signal varies from 2 to 95% in proportion to the signal that is being received from the droop potentiometer on the electrical converter. This is adjusted by the service personnel. The base frequency of the PWM signals are constant at 415 to 528 Hz.The electrical converter is supplied by the operating power at the throttle position sensor terminals. The terminal "1" is an input and the terminal connects to terminal "3" of the speed potentiometer. The terminal "2" is an input and the terminal connects to terminal "2" (wiper) of the speed potentiometer. The terminal "3" of the electrical converter is an input and the terminal connects to terminal "1" of the speed potentiometer. The terminal "S" of the electrical converter is an output and the terminal provides a speed signal to the engine electronic control. The terminal "D" of the electrical converter is an output and the terminal provides a droop signal to the engine electronic control.