System Description; Measurement Principle; System Type - Roland R1000 Series Manual

B0060191 / Rev. 1.7

3 System description

Flexible production systems in the sheet processing industry require automated, reliable double
sheet detection in order to protect presses and other processing machinery from damage by
multiple sheets. The I20 was specifically developed for this technical environment.
The I20 is based on the product platform R1000 and consists in the standard version of three
components:
• a control unit
• one pair of sensors (transmitter and receiver)
• one pair of sensor cables
3.1

Measurement principle

The function of the sensor system is based on the measurement of eddy currents. The sensor
system consists of a transmitter and a receiver.
The transmitter generates an electromagnetic field, which generates eddy currents in the target.
The eddy current loss in the sheet dampens the electromagnetic field. These losses are measured
in the receiver and are a measure of the sheet thickness (see also section "Sensor diagrams").
3.2

System type

With the system parameter "System type" the function of the I20 can be fundamentally changed.
Possible choices:
a) Standard
b) FE + AL 0.5 - 3 mm
c) FE + AL 0.1 - 0,8 mm
d) FE + Austenit 0.1 - 1 mm
f) FE + Austenit 0.5 - 3 mm
g) Frequency
h) Damping mode
With the selections b) – f) the following applications are conceivable:
• Only 2 programs are used, one program for ferrous and the other one for nonferrous
material. With each change of material the program for the corresponding material is
switched and the first sheet is used for Teach-In.
• All programs are used. The Teach-In can be performed with running sheet, without stating
nominal thickness and conductivity.
The selections b) - f) are intended as substitution for the mode "Dimension %" known from the
I10K.
ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
Manual
Double Sheet Detector R1000-series I20
with integrated fieldbus interface
Here mm or inch can be selected as dimension.
The nominal sheet thickness as well as the material must be entered.
For NF (nonferrous) material the electrical conductivity must be entered, or the
conductivity must be determined at sheet standstill. Only then a dynamic
Teach-In can be performed.
The materials which can be measured depend on the restrictions of the sensor
pair used.
Restricted measurement range !
Here only % can be selected as dimension.
The nominal sheet thickness does not need to (/cannot) be entered.
Only FE (ferrous) and NF (nonferrous) material are available for selection.
A dynamic Teach-In can be directly performed.
Depending on the selection (b - f) only those materials and thicknesses can be
measured! (restricted measurement range!)
Monitoring Parts for Hardened / Tempered Properties and Materials Mix up.
The input of nominal dimensions is not necessary. The measurement
frequency is adjusted according to the task under consideration (review the
following explanations)
Within the system parameter „System type - Standard" there will be no error-
free dynamic Teach-In execution in a sophisticated constellation of work
environment. The error message 151 "Sheet too thick" is reported. This
problem occurs especially when using magnetic conveyors. For this case you
must choose the system type "Damping mode".
System description
21