DC-DC Converter

E196

Accelerator Control Optical Switch (1) Signal receiver. (2) Vane. (3) Signal generator. (4) Optical switch.

The accelerator control is a solid state device that generates sixteen different voltage patterns on four wires that input to the logics. The sixteen patterns provide sixteen speed levels including one level for no speed. The first twelve patterns control lift truck travel speed between 0 and 50% of the speed range. The last four patterns control lift truck travel speed from 50 to 100% of the speed range.

Four optical switches are used to generate these voltage patterns. Each switch consists of a light emitting diode (signal generator) and a photo activated transistor (signal receiver). When infrared light from the signal generator reaches the receiver, the switch output signal will be LOW voltage. When the light id blocked, the switch output will be a HIGH voltage. The four optical switches are located on a printed circuit board inside the accelerator control. Vanes molded into the moving part of the accelerator alternately block or allow the infrared light to reach the signal receiver. Together these vanes and switches generate the voltage patterns, shown in the chart, as the accelerator is depressed:

ACCELERATOR VOLTAGE PATTERNS

Accelerator P1-10 P1-9 P1-8 P1-7 Voltage Function

Position Pattern Pattern

Full Up 15V 15V 15V 15V 1 Zero Speed (no pulse)

15V 15V .2V 15V 2 15V 15V .2V .2V 3 15V 15V 15V .2V 4 15V .2V 15V .2V 5 15V .2V 15V 15V 6 15V .2V .2V 15V 7 15V .2V .2V .2V 8 .2V .2V .2V .2V 9 .2V .2V 15V .2V 10 .2V .2V 15V 15V 11 .2V ,2V .2V 15V 12 .2V 15V .2V 15V 13 .2V 15V .2V .2V 14 .2V 15V .2V .2V 15 Bypass position with field shunt full ON

Full Down .2V 15V 15V 15V 16 Bypass position with field shunt full ON or OFF P9-1 Battery Positive, P9-6 Battery Negative Pulsing Operation With Field Shunt Full On

NOTE: All voltages are approximate.

Accessory Circuits

Horn Circuit

The horn will operate when the battery is connected and the horn button is pushed. Current flows from battery positive through the horn fuse, horn switch and horn back to battery negative.

Hour Meter Circuit

The hour meter, which is mounted on the cowl, is activated when the battery is connected and the key is turned ON. Current flows from the battery positive through the key fuse, key switch and display back to battery negative.