User Manual

TIC LEXION 500 Electric System
03/05 Lex-e-28a 28a-3
Description of function:
AUTOPILOT When the road travel circuit is unlocked and the threshing mechanism is
engaged, the AUTOPILOT module (A9) is supplied with power by the main
switch (S10).
Following the start signal from switch (S9), the solenoid coils (Y9/Y10) are
energized according to the signals:
- Sensors (B7/B8) and/or
- Laser pilot (B50)
- of the GPS steering system (via CAN bus)
The control of the steering position is performed by the wheel angle sensor
(B6) in the steering cylinder.
For safety reasons, the autopilot function is interrupted immediately by the
signal of the overrider switch (B83) when using manual steering. If the driver
seat is left, the seat contact (Z5) will interrupt the autopilot function after
approx. 5 s.
The centralizing switch (R3) enables the machine to drive precisely straight
ahead even when driving on a slope.
For a quick response of the steering in autopilot mode, the hydraulic system is
equipped with a pressure accumulator. If the pressure in this pressure
accumulator falls below approx. 135 bar, an oil pressure sensor (B5) actuates
the master valve (Y77) via the Autopilot module (A9 - pin 25) until the
pressure level reaches approx. 165 bar again.
Accumulator filling For quick response of the steering in autopilot mode, the hydraulic system is
equipped with a pressure accumulator.
- pressure-controlled
(by B5)
If the pressure in this pressure accumulator falls below approx. 135 bar, an oil
pressure sensor (B5) actuates the master valve (Y77) via the Autopilot
module (A9-/ 25) until the pressure reaches approx. 165 bar again.
An existing oil pressure sensor (B5) is automatically identified by the
AUTOPILOT module (A9). There is no need for configuration.
If no oil pressure sensor (B5) exists or if it fails, the Autopilot system
automatically switches over to time-controlled filling of the accumulator.
- time-controlled
(without B5)
The accumulator is filled cyclically. The steering cylinder path is considered in
this process.
After activating the Autopilot function, the AUTOPILOT module (A9) actuates
the master valve (Y77) for 0.7 sec. The accumulator pressure thus
corresponds to the working hydraulics system pressure.
The path covered by the steering cylinder as a function of steering
movements is added up in the AUTOPILOT module (A9). After a path
corresponding roughly to a drop of accumulator pressure to 150 bar, the
AUTOPILOT module (A9) again actuates the master valve (Y77)
automatically for 0.7 sec.