Manual lifting/lowering of vehicle frame function

W32.33-2087-79

Preconditions

 Circuit 15 ON

 Vehicle speed  30 km/h

Raise or lower vehicle frame via level control operating unit (S22)

Activate level control operating unit (S22) by pressing any button. The level control operating unit (S22) shows the readiness to operate by illuminating the function indicator.

Select the function raise/lower front axle, raise/lower the overall vehicle, raise/lower rear axle by pressing the left or right arrow key.

Pressing the upper or lower arrow key activates the raising or lowering function respectively.

The level control control unit (CLCS) (A26) receives the signals from the level control operating unit (S22) connected to the single signal acquisition and actuation module control unit (SSAM) (A7a) via the central gateway control unit (CGW) (A2) and actuates the level control for 2-axle vehicles valve unit (Y21) at the drive axle and the front axle level control valve unit (Y20) for full air suspension.

The level control for 2-axle vehicles valve unit (Y21) and the front axle level control valve unit (Y20) aerate or purge the air spring bellows (43.01) on the drive axle or front axle depending on the selected function. The chassis frame is raised or lowered.

In the multifunction display (A1 p1) of the IC (ICUC) (A1) the message "Towing vehicle outside driving level" is displayed and the level control indicator lamp (A1 h14) of the IC (ICUC) control unit (A1) is actuated.

 The function messages for level control are not displayed if the driver is in the menu for level control.

The LH drive axle position sensor (B24), the RH drive axle position sensor (B25) or the front axle position sensor (B27) send the change in frame height to the level control (CLCS) control unit (A26).

 As soon as the level control (CLCS) control unit (A26) recognizes the signals from the LH drive axle position sensor (B24), the RH drive axle position sensor (B25) or the front axle position sensor (B27) that the upper or lower frame height limit has been reached then it independently interrupts raising or lowering of the vehicle frame. The vehicle frame therefore remains in the uppermost or lowest maximum position.

If the desired vehicle frame height is reached, raising or lowering of the vehicle is stopped by actuating the stop button.

The level control control unit (CLCS) (A26) receives the stop signal from the level control operating unit (S22) connected to the single signal acquisition and actuation module control unit (SSAM) (A7a) via the central gateway control unit (CGW) (A2) and actuates the level control for 2-axle vehicles valve unit (Y21) at the drive axle and the front axle level control valve unit (Y20) for full air suspension in accordance with the stop signal. The sleeve air springs (43.01) are no longer aerated or ventilated.

The existing frame height of the vehicle is taken by the level control (CLCS) control unit (A26) as the new specified level with a delay of 4 s.

Return to driving level

The vehicle frame is standing at any height. Select the driving level function using the left or right arrow key.

Pressing the upper or lower arrow key activates the function and deactivates the level control operating unit (S22). The function indicator for the level control operating unit (S22) goes out.

The level control (CLCS) control unit (A26) initiates aeration or purging of the sleeve air springs (43.01), dependent on the position of the vehicle frame, via the level control for 2-axle vehicles valve unit (Y21) as well as the front axle level control valve unit (Y20) for full air suspension.

The LH drive axle position sensor (B24), the RH drive axle position sensor (B25) or the front axle position sensor (B27) send the change in frame height to the level control (CLCS) control unit (A26). As soon as the level control (CLCS) control unit (A26) recognizes reaching of the driving level (normal level) from the signals from the LH drive axle position sensor (B24), the RH drive axle position sensor (B25) or the front axle position sensor (B27), it appropriately actuates the level control for 2-axle vehicles valve unit (Y21) as well as the front axle level control valve unit (Y20) for full air suspension. The sleeve air springs (43.01) are no longer aerated or ventilated.

The message "Towing vehicle outside driving level" in the multifunction display (A1 p1) of the IC (ICUC) control unit (A1) as well as the level control indicator lamp (A1 h14) of the IC (ICUC) control unit (A1) go out.