Bomag BPR 45/55 D, Operating Instructions Manual

Page: 22 / 70

Indicators and Controls
BOMAG 22 BPR 45/55 D, BPR 55/65 D
4.3 Function of the Economizer
Surface covering compaction control is used to de-
termine the dynamic stiffness of the soil. A accel-
eration 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.
Fig. 13
The Economizer consists of two components:
l
the evaluation and display module is integrat-
ed in the maintenance flap (within the operator's
view). It shows the measuring value measured by
the compaction control.
l
The acceleration sensor is fastened to the
base plate. It converts 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 processed by the evalua-
tion unit.
In order to achieve the required soil stiffness
measured in MN/m
2
, 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 re-
quired value in MN/m
2
on the soil being compact-
ed.
Evaluation and display module
Fig. 14
The yellow LEDs represent the measuring value
from the compaction 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 re-
duced brightness).
The red LED informs about the system status.
Acceleration sensor
The sensor consists of a sensor element, which is
enclosed in a sensor housing, and a connecting
cable with plug-in connector. Actual sensor, hous-
ing, 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 ma-
chine.
Note
i
The Economizer is maintenance free.
Do not clean the front screen with hard objects!
The material may be destroyed. Possibly disturb-
ing scratches can be removed by polishing, e.g.
with lacquer polish.
Note
i
Vibrating plates of the same type show identical
measuring values when used on the same soil.
The measuring values achieved with different vi-
bratory plates with Economizer from BOMAG can
be made comparable by calibration to a reference
value.