Levelling with the W 210
Wirtgen large milling machines are equipped with levelling systems which permit them to work with pin-point accuracy in a large variety of different requirements and environmental conditions. Maximum precision in the millimetre range when fine milling, for instance, is part of the machines' everyday work.
LEVEL PRO - High precision and intuitive handling
The new, proprietary automatic levelling system LEVEL PRO from Wirtgen supplies information on the levelling process and enables the milling depth to be regulated from the operator’s platform. Intuitive and ergonomically optimized handling with user-friendly graphical displays and function keys is one of the system's many outstanding hallmarks.
The LEVEL PRO controller is the "brain" of the system. It evaluates the data transmitted by the sensors, controls the machine’s height adjustment, and then forwards these data to the control panel. The software with optimized control characteristics ensures continuously excellent milling results.
Different sensors are available to meet the different requirements on the accuracy of the final surface. All sensors can be connected to the LEVEL PRO system: Simply plug in, and here goes!
Please consult Parts and More for additional information on LEVEL PRO.
Field-proven sensors and sensor systems for any application
The machines come complete with a standard pre-installation package that allows up to five sensors to be connected to existing plugs on each machine side.
Displacement sensor
Two hydraulic cylinders with displacement sensors capture the milling depth at the side plates on both machine sides.
Ultrasonic sensor
Ultrasonic sensors are capable of non-contact measuring. They can scan both the height of the side plate and a reference surface next to or in front of the milling drum.
Transducing sensor
The transducing sensor scans a previously tensioned stringline.
Slope sensor
The slope sensor is permanently mounted at the chassis and works like an electronic pendulum. It is mostly used in combination with a cylinder sensor, ultrasonic sensor or transducing sensor.
Laser sensor
Laser sensors work in combination with a rotating laser transmitter which defines a spatial reference surface with its laser beam. These signals are received by two laser sensors mounted on the machine. The cold milling machine has been levelled correctly as soon as the two sensors receive the signal at an identical height.
Multiplex system
The machine’s elevation above the reference surface is traced by means of two ultrasonic sensors and the sensor mounted at the side plate. A mean value is calculated from the measured results, and the milling depth is adjusted accordingly. This enables existing pavement irregularities to be levelled, resulting in a milled surface of excellent evenness.
The ultrasonic sensors in front of the front crawler track and behind the rear crawler track are mounted in adjustable brackets. The sensor mounted at the side plate is used to measure the milling depth in the central area of the machine. A multiplex system can be mounted on the left or right side of the machine and is suitable for use in a cold milling machine together with a slope sensor, side plate sensor or second multiplex system.
Sonic ski
The sonic ski is a multiple ultrasonic sensor which can be used for scanning a wire, as well as for scanning a reference surface.
3D system
A total station locates a prism on the milling machine to determine the precise position of the milling drum. These data are reconciled with a previously created digital terrain model of the surface to be produced by milling. Any deviation is immediately corrected by the automatic levelling system.
