Roland Double Sheet Detector R1000 Series Manual page 24

System description
3.5.3 Program parameters
3.5.3.1 Program parameters for the Double sheet detection
This menu structure is valid for the system types a – f (for details refer to chapter 3.2)
For measuring an eddy current method is used – called "Transmission" measurement. For
linearization purposes there are compensation curves, applicable to various conductivities and
thicknesses. Magnetical materials have their own compensation curves.
To determine the compensation curves a calibration (later merely called "Teach-In") must be
performed.
In order to avoid frequent Teach-In procedures for different materials and thicknesses, the unit
provides for 255 program memories. Every such memory consists of a data set with the relevant
parameters.
"Program number"
Selects the number of the data set (1...255) which is to be applied for measurement.
"Sensor number"
Input of the selected sensor (/sensor sequence) for multi-channel systems (e.g. I20-4-...).
"Nominal thickness"
Specifies the nominal thickness of the sheets to be measured.
Value range 0.000...15.00 mm (0.000...0.590 in) Default setting 0.00mm / 0.000 inch.
"Material"
Specifies the material to be measured.
Choices: ferromagnetic material, non-magnetic material and non-magnetic material with unknown
conductivity.
"Lower limit TL" and "upper limit TU"
Changes the limit values for the lower and upper switching threshold. The values can be entered
either in % or in mm/inch. On these thresholds depend the status signals.
In a window comparator the three signals will be generated from the measuring signal. The signal
"0-sheet" is generated when the measuring signal falls short of the lower switching threshold TL.
The lower switching threshold TL can be set from 1...99%. The signal "2-sheet" is generated when
the upper switching threshold is exceeded. The upper switching threshold TU can be set from
100...180%. If the measuring value is within both limits, the signal "1-sheet" is generated.
Obere Schaltschwelle
Upper switching threshold
Untere Schaltschwelle
Lower switching threshold
Fig. 9: Visualization of switching thresholds
ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
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Double Sheet Detector-series I20
2
1
Signal
0
Manual
c
Signal range for 0-sheet
Signal range for 1-sheet
b
Signal range for 2-sheet
Upper switching threshold
Lower switching threshold
a
B0069991 / Rev. 1.7
a
b
c
TU
TL