Manual
Double Sheet Detector-series I20
B0069991 / Rev. 1.7
System description
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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 are:
a) Standard
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.
b) FE + AL 0.5 - 3 mm
c) FE + AL 0.1 - 0,8 mm
d) FE + Austenite 0.1 - 1 mm
f)
FE + Austenite 0.5 - 3 mm
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!)
g) Frequency
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)
h) Damping
mode
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“.
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.