Roland R1000 Series Manual page 32

System description
"Zero adjust"
Before commissioning a new system, after having exchanged a sensor or a sensor cable or a
control unit, a zero adjust must be performed. This zero adjust eliminates the variation of the
sensors. The sensors can be zero adjusted "separately" or "all in one stroke".
• The zero adjustment is valid for all programs.
"Teach-In"
Because of the linearization of the sensor it is possible to measure with factory calibration in many
applications. However, the prerequisite for such measurement are:
• Use of the preset thresholds „low" (lower limit = 80%) and „up" (upper limit = 120%)
• Correctly executed zero adjustment
It is, however, possible that the measurement is not satisfactory: Then the measured thickness
values under normal operating conditions deviate sufficiently to generate nuisance trips. If, for
example among the measured value is too low or too high, the control unit generates an under
gauge signal (0-sheet) or an over gauge signal (2-sheet). As a consequence the transportation of
the sheet is stopped by the PLC - even though no obvious fault has occurred.
Such a deviation of the measured value can have different causes, for example:
a) the measured sheet actually has an under gauge or over gauge thickness
b) there is air gap present between the sensor and the sheet surface
c) the measured material differs in its magnetic properties from the reference material ST37
(regular low carbon steel), the linearization curve does not fit the material
In the cases of a) and b):
The causes have to be eliminated, otherwise the measurement will not be satisfactory.
In the case of c):
Here the teach-in calibration has to be executed with the material to be processed. After the
teach-in procedure the measurements will be more precise with the processed material. The
calibration applies only to the selected program.
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ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
32
Double Sheet Detector R1000 series E20
with integrated fieldbus interface
Manual
B0046191 / Rev. 1.12