Function Of The Economizer - Fayat Group Bomag BPR 70/70 D Operating And Maintenance Instruction Manual

Display and control elements – Function of the Economizer

4.3 Function of the Economizer

Fig. 12
Evaluation and display module
Fig. 13
Acceleration sensor
Surface covering compaction control is used to determine the
dynamic stiffness of the soil. A acceleration sensor measures the
reaction of the soil to the vibrating base plate of the vibratory plate.
An LED display shows the soil stiffness measuring value as a non-
dimensional value.
This continuous measuring display enables the detection and
directed subsequent compaction of possibly arising weak spots.
The Economizer consists of two components:
n the evaluation and display module is integrated in the mainte-
nance flap (within the operator's view Ä Fig. 12). It shows the
measuring value measured by the compaction control.
n The acceleration sensor is fastened to the base plate. It con-
verts the accelerations occurring on the base plate into voltage
signals.
For the output of the measuring value in the LED display the
voltage signal from the acceleration sensor is picked up and pro-
cessed by the evaluation unit.
In order to achieve the required soil stiffness measured in MN/m
a reference measurement (e.g. dynamic load plate) must be made
before the material is compacted.
This is necessary to find out how many LEDs in the Economizer
display correspond with the required value in MN/m
being compacted.
The yellow LEDs represent the measuring value from the compac-
tion control in 10 stages.
The brightness of the respective last LED varies in order to show
intermediate values (example: 4.5: four LEDs are fully on, the fifth
LED lights with reduced brightness).
The red LED informs about the system status.
The sensor consists of a sensor element, which is enclosed in a
sensor housing, and a connecting cable with plug-in connector.
Actual sensor, housing, cable and plug-in connector come as a
unit, which cannot be repaired on its own.
The unit is mounted to the base plate of the machine.
BPR 70/70 D
2 ,
2 on the soil
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