Microsonic dbk+5-3CDD-M18 E+S User Manual

Operating Instructions

Ultrasonic double sheet detection
with 2 switched outputs

dbk+5/3CDD/M18 E+S
dbk+5/3BEE/M18 E+S

Functional principle

The function of the double sheet de­tection is to detect two or more
sheets or other laminary materials ly­ing one on top of the other. The sen­sor system consists of a transmitter
and a receiver complete with integra­ted evaluation electronics.
A high-frequency ultrasonic transmit­ter beams from the underside
against the sheet material. The emit­ted ultrasonic pulse excites the sheet
material into vibrations. The effect of
these vibrations is for a very small
sonic wave on the other side of the
sheet to spread. This wave is received
by the ultrasonic receiver located
there. In the case of sheet one on
top of the other (double sheet), the
receiver detects the difference in sig­nal and sets its outputs accordingly.

Ultrasonic sensors

Product description

■ Assured detection of single, dou­ble and multiple sheet.

■ Scanning of sheet material
weights from 100 g/m2 to 2,000
g/m2, corrugated cards, sheet me­tals, printed circuit boards, films
and plastic sheets up to several
mm thickness possible.

■ Double sheet and missing sheet
output as pnp or npn switched
outputs.

■ Vertical mounting to the sheet run­ning through permitted.

■ Three control inputs allow for an
external setting of sensitivity for
the material to be scanned.

■ Changes to sensitivity classes un­der ongoing operations can be un­dertaken.

■ Additional teach-in mode e.g. for
scanning wafers glued with a wa­ter film.

■ Optional trigger operation mode
e.g. for applications in the shin­gled stream.

■ Parameterization via LinkControl

■ 0.5 ms response time until a dou-

ble or missing sheet in the trigger
mode is detected.

■ Transmitter-receiver spacing can
be selected from 30 to 70 mm

Safety tips

■ Read the operating instructions
before start-up.

■ Only qualified personnel are to un­dertake connection, mounting and
settings.

■ Not a safety component in keep­ing with the EC Machinery Direc­tive.

Mounting

▸ Mount transmitter and receiver in

keeping with Fig 1 at the recom­mended spacing of 50 mm ± 3
mm .
dbk+5 can be fitted at any posi­tion .

▸ Connect the transmitter to the re-

ceiver using the M8 connector.

▸ Connect the receiver 7-strand con-

trol line in keeping with Fig 2.

Pointer

■ If required, spacing between trans-

mitter and receiver can be ad­justed to the local circumstances in
the 30 to 70 mm range; see under
»Teach-in spacing between trans­mitter and receiver«.

■ The coaxiality of transmitter and
receiver must be ≤ 0.5 mm.

■ Transmitter and receiver are not to
be inclined to each other in excess
of 2°.

■ Vertical mounting to the sheet is
recommended for papers (Fig 1a).

■ In case of vertical mounting to the
sheet, the spacing between trans­mitter and/or receiver and the
sheet running through is not to be
under 7 mm.

■ In case of certain sheet metals or
thicker plastic films, the dbk has to
be mounted at an inclination to
sheet normal depending on the
material (Fig. 1b). If necessary the
optimum mounting position has
to be determined in a test.

■ Thick papers and paperboard re­sponsible for faulty switching in
case of vertical mounting can of­ten be scanned at a 27° to 45°
mounting angle to sheet normal.
Corrugated cards have to be mea­sured obliquely to the waves (Fig
1c).

■ Other materials may make a special
fitting position necessary. Do con­tact microsonic when you work
with these special materials.

■ The max. torque of the nuts is 15
Nm for the M18 sleeves.

■ The drill hole must be ≥ 12 mm
given that the transmitter is re­cess-mounted or a sheet feed is
envisaged between transmitter
and receiver. The recommendation
is for a 18 mm diameter (see Fig

1).

■ The line between transmitter and
receiver is not to be bridged with
an external potential.

Fig. 2: Colour coding of the control line

Start-up

▸ Select the »Standard« sensitivity

class by placing all the 3 control
inputs onto logic 0 (see Figs 3 and

4) or leave them unconnected.
Switch on the dbk+5 voltage sup­ply.

Pointer

■ The »Standard« sensitivity class
corresponds to the setting of
predecessor model dbk-5.

Check the function with a test sheet.
▸ Hold a single test sheet within the

working range between transmit­ter and receiver.

The LED must light up green for
"Single sheet detected«. (Should the
LED light up red, then check on the
dbk+5 fitting dimension and the se­lected test sheet.)
▸ Hold a double test sheet within

the working range between trans­mitter and receiver.

The LED must light up red for "Dou­ble sheet detected«.
▸ Remove all the sheets between

transmitter and receiver.

The LED must flash red for "Missing
sheet detected«.

+U

B

-U

B

Colour

Brown

Blue

Single/missing sheet output

Double sheet output

Control input C1
Control input C2

Black
White
Violet
Pink

Control input C3/Com Grey

Pointer

■ You can use a material of a high
sheet weight as the test sheet or
the test sheet itself obtainable as
an accessory with the »dbk test
sheet« article name. This test
sheet works as critical material at
the ambient temperature in the
»Standard« sensitivity class and
can be used to examine the cor­rect adjustment and function.

Factory setting

The dbk+5 are delivered with the fol­lowing factory settings:

■ Free-run mode with 3 sensitivity
classes and teach-in

■ Missing sheet output on NCI

■ Double sheet output on NCI

■ 50 mm spacing

Fig. 9: LED displays

Condition

single sheet

single sheet
overmodula­tion

LED 1 LED 2

Green

Green

Green

Green
+ Red =
Orange

static on

static on
double sheet

missing sheet

Teach-in
activated

Teach-in
dismissed

Red

Red

Red

Red

Green

Red

Green

Red

static on
flashing

flashing
mutually

flashing
mutually

Teach-in spac­ing transmit­ter-receiver

Teach-in
dismissed

Red

Red

Green

Red

flashing
mutually

flashing
mutually

Fig. 1: Mounting and installation positions

2004/108/EC

Operation in the free-run
mode

The dbk+5 operates in the free-run
mode ex-works. In the free-run
mode, the dbk+5 performs measure­ments cyclically.

Pointer

■ If measurements should be taken
in the shingled stream, then an ex­ternal trigger signal can individu­ally trigger each measurement. To
this end, the trigger mode can be
parameterized with the help of
the LCA-2 LinkControl adapter
available as an accessory and the
LinkControl software.

Fig. 3: Voltage level of the logic states at

the control inputs

Sensitivity classes

The fact that the dbk+5 control in­puts are unconnected or on logic 0
points to pre-selection of the »Stan­dard« sensitivity class where the
range of sheet material weights from
a typical 100 g/m2 up to 2,000 g/m

2

can be scanned.

■ The 3 control inputs allow the sen­sitivity classes to be pre-selected in
keeping with the Fig 4 table.

■ The »Thin« setting has to be se­lected for thin materials.

■ The working range can be en­larged to thicker materials by
choosing the setting »Thick«.

■ Changes between sensitivity
classes can be undertaken under
on-going operations.

■ Pre-selecting an over-low sensitiv­ity class can result – even with a
single sheet – in a double sheet
signal appearing. In such an in­stance, the next-higher sensitivity
class is to be pre-selected.

■ Pre-selecting an over-high sensitiv­ity class results – given a single
sheet – in the double-sheet detec­tion indicating overmodulation at
the LEDs: one LED lights up green
and the other green-red (orange

Logical state

0

Voltage level

pnp

-U

B

npn

+U

B

1

+UB-U

B

blend). In such an instance, the
next-lower sensitivity class is to be
pre-selected.

Pointer

Parameterization of the D1 switched
output onto the »Overmodulation«
output function achieved with Link­Control software results in the over­modulation signal being additionally
outputted on D1.

Teach-in

The teach-in mode is also available
for materials glued to each other
across their full extent (e.g. two wa­fers bonded with a water film, a
spline on a paper web) and special
materials which cannot be scanned
with one of the 3 sensitivity classes

▸ Select the teach-in mode (C1 and

C2 on logic 1) in keeping with the
table in Fig 4.

This is the way to teach-in a material:
▸ Place a single sheet of the material

in the working range of the dou­ble sheet detection.

▸ Place the C3 control input on logic

1 for a minimum of 3 seconds.
Materials with inhomogeneities
must be moved during the teach­in phase so that dbk+5 can detect
them.

Success with a teach-in operation is
shown by a green LED. In instances
of where no material teach-in was
possible, dbk+5 flashes in red. Then
repeat the operation.
▸ On finishing the teach-in opera-

tion, either place the C3 control
input on logic 0 or leave it uncon­nected.

The material can now be scanned.

Pointer

■ C3 must not be on logic 1 when
the supply voltage is connected.

Fig. 4: Free-run mode: selection of the sen-

sitivity class and Teach-in

Parameterization with Link­Control

The dbk+5 can be extensively pa­rameterized under LinkControl. Here
you need the optionally available
LinkControl adapter LCA-2 and the
LinkControl software for Windows©.

Operation onto LinkControl

▸ Install the LinkControl software

onto your PC.
Connect the LinkControl adapter
to your PC with the USB cable.

▸ Connect dbk+5 to the LCA-2 in

keeping with the Fig 5 table. For
this, use the adapter cable in the
LCA-2 case.

▸ Connect the voltage supply cable

to the LCA-2 on the other side of
the T connector.

▸ Start the LinkControl software and

follow the instructions on the
screen.

Fig. 5: Connecting dbk+5 to the LCA-2

The following settings can be under­taken:

■ Numeric input of the spacing be­tween transmitter and receiver

■ Function for the D1 switched out­put
Missing sheet = NCC (single sheet
= NCO) or
Missing sheet = NCO (single sheet
= NCC) or
Overmodulation = NCC or
Overmodulation = NOC

Standard
Thick

C1 C2

000

1

C3

0

0
Thin
Teach-in-Mode
Teach-in active

110

1

1 1

0

0

1

+UB-U

B

Colour
dbk+5

Colour

adapter cable

Brown

Blue

Brown

Blue

Pin

1
3

C3/Com Grey Grey 5

■ Function for the D2 switched out­put
Double sheet = NCI or
Double sheet = NCO

■ Operating mode

Free-run mode with 3 pre-defined
sensitivity classes and additional
teach-in mode or
Free-run mode with 4 indepen­dent teach-in classes or
Trigger mode with 2 pre-defined
sensitivity classes and additional
teach-in mode or
Edge- or level-controlled trigger
mode

Also available is a diagrammatic re­presentation of the readings.

Operation in the trigger
mode

If LinkControl was used to parame­ters the trigger mode, then the exter­nal trigger signal is to be placed on
the C2 control input.
Available in the trigger mode are
sensitivity classes »Standard«, »Thin«
and the teach-in mode in keeping
with the Fig 6 table.
In the edge-controlled trigger setting
(see Fig 7), the double sheet detec­tion takes a measurement with every
edge from 0 to 1. The finding is then
stored until the next trigger edge.

Fig. 6: Trigger mode: selection of the sensi-

tivity class and teach-in mode

In the level-controlled trigger mode,
dbk+5 keeps on taking measure­ments for as long as the trigger sig­nal is on hand. With dbk+5 deacti­vated (C2 control input to logic 0),
the reading of the last measurement
at the switched outputs is frozen (see
Fig 8).

Free-run mode with 4 inde­pendent teach-in classes

Parameterization with the aid of
LinkControl of the free-run mode
with 4 independent teach-in classes
makes teach-in possible for up to 4
different materials. As a result, the
»Standard«, »Thick«, »Thin« and
»Teach-in mode« sensitivity classes
can be individually adjusted (see on­line help in LinkControl).

Teach-in spacing between
transmitter and receiver

Teach-in of the selected spacing be­tween transmitter and receiver must
be undertaken should you not have
mounted transmitter and receiver at
the recommended 40 mm or 30 mm
spacing.

▸ Clear the measuring section of

sheet materials between transmit-

Standard
Thick

C1 C2

00Trigger

Trigger

C3

0

1
Teach-in-Mode
Teach-in active11

Trigger
Trigger01

ter and receiver.
Place all the 3 control inputs on
logic 1.
Switch on the supply voltage: The
LEDs flash alternately red and
green.
Wait at least 2 seconds.
Place the C3 control input on logic

0.

Pointer

■ Any failure to teach-in the set
spacing results in dbk+5 flashing
in red for 3 seconds.

dbk+5 is operating normally. Finally,
select the requested type of opera­tion through the control inputs.

Maintenance

No maintenance is need on the dou­ble sheet detection. We would re­commend cleaning the sensor sur­faces at the transmitter and receiver
should they become very dirty. The
best thing is to apply some isopropa­nol onto a cotton cloth and then
wipe the surface clean. Make sure
that the reaction time of the cleaner
is kept down. That means quickly
wiping dry the transducer surfaces.

Double sheet Missing sheetSingle sheet

Assingnment

1

0

t

1

0

t

1

0

t

Control input C2

Double sheet output

Missing sheet output

Double sheet Missing sheetSingle sheet

Assingnment

1

0

t

1

0

t

1

0

t

Control input C2

Double sheet output

Missing sheet output

Fig.7: Trigger mode edge-controlled Fig. 8: Trigger-mode level-controlled