Service Training
Section 6
Page 38
6.3.7 Set value potentiometer (handlebar/tiller) Wheel potentiometer
The electric steering is equipped with two potentiometers,
- a potentiometer placed in the brake pivot called set value potentiometer, without mechanical control.
- a potentiometer placed in the steering reduction gear called wheel potentiometer, without mechanical
control.
The operating principle is simple, the LES controls the motor to bring the wheel to an angular value
corresponding to the one requested by a handlebar or the tiller. The steering potentiometers provide a
voltage enabling the LES to calculate this steering angle. Each potentiometer is double (2 tracks, to obtain
redundancy, for safety reasons)
The steering permanently controls the status of each potentiometer by the total of the values of link
voltages no. 1 + no. 2, this total must correspond to the supply voltage.
The value of the stabilised voltage (potentiometer supply) as well as that of the links are converted
into % : "radiometric voltage".
- The stabilised voltage is 100%
- The links are in right line position: the values are 50%
- Thus no.1 + no.2 = stabilised voltage ==> 50% +50% = 100%
SET VALUE POTENTIOMETER
Connector X13
Terminal
Colour Function
1 BU(320) Supply +8.2 V
2 BU(302) Negative
3 BU(303) Set value (link) no.1 calculates the angle
4 BU(304) Set value (link) no.2 redundancy
Connector 3X3
Terminal
Colour Function
1 BU(313) Link no.1 calculates the angle
2 BU(312) Link no.2 redundancy
3 BU(321) Supply +8.2 V
4 BU(312) Negative
WHEEL POTENTIOMETER (CURRENT VALUE)
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