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.
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