Contactor Panel - TM-10-3930-631-340118

TM 10-3930-631-34

Figure 9-3. Accelerator control.

(2) As the accelerator is depressed it in-

d. Contactor Panel

creases resistance in the speed potentiometer (fig. 9-3).

(1) The contactor panel (fig. 2-7) is mounted

This action results in an increased voltage to the drive

on the frame below and to the left of the seat. Wiring

motor and increases speed of the truck. Decreasing the

harness circuits are connected to terminals on the

amount of pressure on the accelerator lowers the voltage

bottom of the contactor box.

and decreases speed

of truck.

Releasing the

(2) Electrical contactors in the panel control

accelerator completely halts current flow to drive motor.

operation of the drive motor, hydraulic pump motor and

(3) If the truck is moving and the accelerator is

emergency cutout. When the forward and reverse

released and the direction of travel is reversed, a

control contacts are set in the F (forward) position,

plugging mode is required to supply retarding torque for

current flows through the

closed key, seat and

deceleration. The severity of the plugging action on the

emergency cutout switches, through the forward and

motor can be adjusted with the plugging potentiometer

reverse switch to the contactor panel and through

contactor coil. From the contactor panel it flows to the

(4) An inching control is built into the ac-

static panel control circuit module and back to the

celerator. By slightly depressing the accelerator the

battery negative post.

operator can slowly inch the truck into position. The

(3) When a forward or reverse contactor coil is

inching speed can be adjusted through the inching

energized, the circuits to the speed and inching

potentiometer (fig. 9-3).

potentiometers are closed. Current also flows

9-4