1.18.9. Throttle Control Electrical Circuit

TM 5-3895-373-20 1.18.9. Throttle Control Electrical Circuit. The throttle control switch is a rotary switch with three detents. The clockwise detent sets the throttle actuator to minimum idle speed "IDLE". The counterclockwise detent is for high speed "MAX". The center detent, "HOLD", allows the actuator to stop at any position between idle and high speed. Electrical power is supplied to the throttle control switch on the operator gauge panel from CB 1. The throttle control switch has two contact blocks with three sets of contacts each. The center contact of each block is not used. When the switch is moved, voltage is applied through one contact block to the actuator. Ground is routed through the other contact block. This will cause the linear actuator to drive. Moving the throttle control switch to the opposite position will reverse the contacts. This will cause power and ground to be reversed to the actuator, driving it in the opposite direction. Turning the throttle control switch to one end, then back to mid-position, will cause the actuator to drive in the direction selected, and stop when mid-position is selected. This allows the throttle switch to be a variable or multi-speed set switch while being a limit set switch. 1-34