Pressure Sensing - Siemens SINUMERIK 840D Description Of Functions

7 Peripherals/Accessories

7.3 Pressure sensing

7.3 Pressure sensing
7.3.1 Sensors
General
Instructions for
use
Selection of
pressure sensor
(recommended
types)
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SINUMERIK 840D/SIMODRIVE 611 digital Descr. of Functions HLA Module (FBHLA) – 04.00 Edition
Note
For connector assignments, see Section 5.1.2.
The task of pressure sensors is to convert mechanical quantity "pressure" into
Electrical quantity "voltage" or "current".
The pressure sensors included in the Bosch hydraulic product range are suit-
able for pressure monitoring and control applications in machine construction,
on injection moulding machines, presses and many other areas.
The most important features of the sensors are
S
pressure sensor element consisting of high-quality steel membrane (spring
material), coated with thin-layer strain gauges in full-bridge connection
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integrated electronic circuitry with temperature compensation
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signal output proportional to pressure
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zero point and sensitivity are calibrated exactly by manufacturer
Note
Pressure sensor cables with pre-assembled sensor end are not available. The
following cable information is intended only as an example.
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Sensor must be mounted in vertical position with connector pointing down-
wards.
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The sensor must be installed in the hydraulic system in such a way as to
prevent any air cushions from developing between the sensor membrane
and the pressure medium.
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Pressure medium: Hydraulic fluid; other fluids only after consultation with
Bosch.
Sensors with a signal voltage of U=0...10 V are available in the following vari-
ants for the HLA module:
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