Table of Contents
Advertisement
R O L A N D
Rev. 1.0
3.3.2 Program parameters
The sensor is operated in two different modes. For FE material an electro magnetical method – called
"P" measurement – is used. For the P measurement a compensation curve for linearization exists. The
compensation curve fits to ST37 steel. Other steel alloys resp. magnetical materials deviate from this
curve. This causes measuring results which can deviate for more than 5% from the real sheet
thickness. In such cases it is useful to calibrate the unit (later merely called "Teach-In").
For NF material an eddy current method – called "W" measurement – is applied. Here a Teach-In is
required, since there is no general linearization curve.
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 following parameters.
"Sensor number"
For multi-channel systems (e.g. UDK20-2PW...) or a system with external sensor switch box SSB-
UDK10 the selected sensor must be entered.
"Material"
Selects the material type FE, NF or LM (slightly magnetical stainless steels). In case of unknown
material AUTO must be chosen. For all settings (except for FE) a Teach-in is required.
"Nominal measure"
Changes the nominal measure. It can be shown in mm or inch.
Default setting either 0,03mm or 0,001 inch.
"TO" and "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 the status signals depend. 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.
The lower switching threshold TU can be set from 1...99%. The signal "2-sheet" is generated when the
upper switching threshold is exceeded. The upper switching threshold TO can be set from 100...150%.
If the measuring value is within both limits, the signal "1-sheet" is generated.
a = Signal range for 0-sheet
b = Signal range for 1-sheet
c = Signal range for 2-sheet
TO = switching threshold for upper limit
TU = switching threshold for lower limit
ROLAND ELECTRONIC GMBH · Otto-Maurer-Str. 17 · D-75210 Keltern · Telefon (0049) (07236) 9392-0 · Telefax (0049) (07236) 9392-33
OPERATING INSTRUCTIONS
DOUBLE SHEET DETECTOR R1000 UDK20
Fig.: Visualization of switching thresholds
Page 23
Advertisement
Table of Contents
