UNICONTROL Electronic S-SW-8 User manual

UNICONTROL Electronic GmbH
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Freinsheimer Straße 3
D- 8219 Mannheim Tel.: [phone]
www.unicontrol
-gmbh.de Fax [phone]
Manual
Object Detector
S-SW-8
02-22-2021
1 Function, Construction and Purpose ....................................................
Evaluation Unit ........................................................................................ 3
2.1 Electrical Connections .......................................................................................... 3
2.2 Sensor Electrodes ................................................................................................ 4
2.3 Configurations and Indication elements ................................................................ 5
2.3.1 SW1: Set sensitivity (relay switching point) & start calibration (SW2-2 OFF) ..................... 5
2.3.2 SW2: Setting of functional properties .................................................................................. 5
2.3.3 Indication Elements ..............................................................................................................
2.4 Installation ............................................................................................................
2.4.1 Starting manual adjustment - switch SW2-2 to "OFF" .........................................................
2.4.2 Sensitivity setting (relay switching point) .............................................................................
2.5 Technical Data ...................................................................................................... 7
3 Montage & Cabling ................................................................................. 8
3.1 System arrangement ............................................................................................ 8
3.2 Electrical connections ........................................................................................... 9
4 Installation ............................................................................................... 9
Warning! Advisement about the difference between S-SW-8 and S-SW-3:
Differently of S-SW-3, the first time that S-SW-8 starts operation, an adjustment must
be triggered with empty sensor detection area. To do this, press SW1 at least 5 sec-
onds, until the LED4 lights up red (calibration started). The calibration process is
completed when LED1 flashes green. Only after that objects can enter the detection
area (relay switches on) or the sensitivity can be changed. We recommend using the
automatic sensitivity adjustment.

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1 Function, Construction and Purpose
The object detector S-SW-8 is a capacity sensor system with a differential signal evaluation to detect
the presence of metallic and other conductive objects contactlessly with the help of connected
sensor electrodes.
The object detector S-SW-8 is mainly used in conveyor technology to control roller conveyors. This
sensor system offers particular advantages in heavily polluted environments, like rolling mills, blast-
ing systems, paint booths, etc. The reason is the insignificant effect on the functions from contami-
nation of slag, metal dust or blasting media on its detection area.
On the first use, the unit must run the calibration process. The detector area must be free of
mobile objects and people during the calibration process. The bias point state is recorded and saved
as a reference.
After that, objects can enter the detection area. If the sensitivity is set appropriately, the presence of
the new objects is detected. A potential-free contact relay turns ON/OFF according to the IN/OUT
movement of objects over the sensing area (the switching position vary according to the type of
objects and configured sensitivity).
The sensor system consists of two parts:
1. Evaluation unit :
Correct connection of the reference potential for the evaluation unit is
essential for proper functionality (connection
of the earth potential)
(X1/3).
The evaluation unit uses sens
or electrodes for detection. They are mounted
in a poly-carbonate case (IP 5) and placed near the electrodes.
. Sensor electrode : The sensor electrodes are not included in the delivery package.
Their
design depends on the specific user application and
must be carried out in
compliance with certain rules (see below) in accordance with the technical
requirements. The shape of the electrodes determines the detection area:
–
Narrow electrodes cause
small switching hysteresis,
–
wide electrodes cause
large switching hysteresis.
The electrodes are connected to the evaluation unit.

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2 Evaluation Unit
The evaluation unit is built into a poly-carbonate housing (IP 5). The electrical connections to the
power supply, reference potential, sensor electrodes and relay contacts are established via three
cable connections.
Figure 1
2.1 Electrical Connections
Con-
nector Pin Connection
X1 1 24 V
AC/DC
Supply Voltage Both polarity accepted
2
3 PE Reference Potential Connected to the earth
X2 1 C Relay common contact
2 NO Relay normally open contact
3 NC Relay normally closed contact
X3 1 Core Connected to the measuring electrode.
Use coaxial cable (75Ω)
2 Shield Connected to the opposite electrode
By inductive load connected on X2 (relay output), use spike suppression to prevent damage of the
relay contacts.

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The connection to the sensor electrodes is made by the 2-pole connector X3 and a coaxial cable.
According to the drawing (see Figure 1), the core is connected to the left terminal X3/1 (measuring
electrode) and the shield to the right terminal X3/2 (opposite electrode).
2.2 Sensor Electrodes
Figure 2
B
asically:
Narrow sensor e
lectrode
s
→
small
switching
hysteresis
wide sensor e
lectrode
s
→
large
switching
hysteresis
The sensor electrodes can have any geometric shape. It is only important that the two elec-
trodes have approximately the same area and are fixed to a grounded structure.
Measuremen
t
electrode
A :
The measurement electrode is connected
to X3
/1 of the evaluation unit via the core
conductor of the coaxial cable.
The measurement and
opposite electrodes must
be made of conductive
material (sheet steel, alu-
minum, etc.). They should
have the same design.
Opposite Electrode
B :
The opp
osite electrode is connected to
X3/
2 of the evaluation unit via the shield of
the coaxial cable.
Montage structure
C :
The design of the mounting structure depends on the conditions at the
installation place. It must be made of conductive material (metal, for fur-
ther examples see above).
The mounting structure must be connected to the earth potential!
Spacers
D :
The spacers must be made of electrically isolating material (plastic / ce-
ramic, see table below).
Construction Rules
min.
max.
Info
Electrodes wide
a 10 mm 200 mm
Spacer diameter, Ø
b no specifi-
cation
no specifi-
cation
Electrically isolating material (plastic / ce-
ramic).
The selected diameter must ensure suffi-
cient mechanical stability.
Spacers are available as accessories from
UNICONTROL (UC spacer M4, M , M10
and M12.
Electrodes gap
c 5 mm 80 mm
Material Mechanical
Capacity
d no specifi-
cation
no specifi-
cation
The material mechanical capacity is not crit-
ical. It should be chosen
considering that
the electrodes have enough mechanical sta-
bility.
Electrodes length
l 20 mm 4000 mm
The sensor electrodes can have any geometric shape. It is important that the two electrodes
have approximately the same areas.

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Warning:
! The earthed mounting structure "C" must be connected to the reference poten
tial of the evaluation
unit (X1/3) via its own line!
The potential of the mounting structure (PE) serves as a reference potential for the evaluation
unit.
! The number of spacers should be
calculated and distributed over the length of the electrodes to
guaranty reasonable mechanical stability.
!
The measurement and opposite electrodes must be fixed on the mounting structure avoiding
electrical contact. Ignoring this rule, will change the wa
y the electrodes work and make them
unusable for the application.
2.3 Configurations and Indication elements
2.3.1 SW1 Set sensitivity (relay switching point) & start calibration (SW2-2 OFF)
With the rotational selector SW1 the sensitivity (switching point of the relay) is set and a new adjust-
ment of the bias point of the S-SW-8 can be triggered.
● SW1 cw rotation → Increase sensitivity
● SW1 a-cw rotation →
Decrease sensitivity
● SW1 > 5s pushing →
New calibration of the sensor is done. The LED4 blinks until the calibration
process is completed (up to 0s). The settings of sensitivity, hysteresis
and memory function are preserved.
2.3.2 SW2 Setting of functional properties
The 2-poles switch SW2, leads to the following behavior of the evaluation unit:
Hysteresis
Memory
-
Function
SW
-
1
SW
-
ON 10 % ON active
OFF 5 % ♥ OFF inactive ♥
♥
=
Default values
●
Hysteresis
(5 or 10%)
:
It is the difference in the sensor signal between the switch-
on point
(occupied) and the switch-off point (free) for the relay.
The sensor signal level for the switch-
ON point is stronger than the
switch-
OFF point. A larger hysteresis means that the switch ON/OFF
points are distanced.
● Memory Function OFF
SW - = OFF
:
Each time the power supply of the evaluation unit is switched ON,
a new adjustment is started automatically.
The last set sensitivity counter is retained, but all other operating pa-
rameters are reset to the current operating situation. The readjustment
means that any objects that are located in the detection area are "for-
gotten". This means that t
he relay is dropped out, even if it was ON in
the last power down. Only additional objects would switch the relay on
again!
● Memory Function ON
SW - = ON
:
When the power supply of the evaluation unit is switched ON, no
new adjustment is made. The last valid operating p
arameters are
restored from non
volatile memory and used. Changes in the reference
conditions in the meantime are taken into account by moving the ref-
erence point.
This function is useful and recommended if there is a work-
piece
in the detection area at the time of switch-OFF and should be rec-
ognized when it is switched ON again.
However, it must be the
same object in the same position
, otherwise the difference is treated
as a change in the reference conditions. This would result in an
invalid
displacement of the reference point and thus a malfunction.
!
Case
a detected object is removed from the detection area while
the sensor is turned-OFF, in the next turning-
ON, the sensor will
incorrectly behave as if the object is still there and the relay will

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switch
-
ON.
This unexpected behavior can be easily corrected b
y
touching the main electrode (forcing over driven state –
LED3 ON) for
at least 4s when the relay goes OFF and the sensor recovers the op-
erational state as soon as the electrode stay free again (untouched).
2.3.3 Indication Elements
LED1
Is active during the measurement process. Its activity allows an approximated idea of the
signal intensity of the sensor electrodes caused by an object in the detection area.
● Slow blinking (1/s) : The sensor is free or only slightly occupied.
● Moderated blinking (2/s) : The sensor is moderately busy.
● Fast blinking (4/s) : The sensor is heavily occupied.
● Always ON (1) : The sensor is over-shoot
and near or over the limit of the
measurement range (see also LED3).
LED Indicates how long t
he push button (SW1) is
pressed:
0 s ... 2 s →
LED2 OFF
2 s …3 s →
LED2
ON
> 5 s →
LED2
OFF and
LED4
ON
LED3 Lights up when the sensitivity range is exceeded (clipping).
LED4 Indicates the error status or the adjustment process:
● Slowly blinking (1/s) : The sensor unit is in the adjustment mode.
● Always ON (1)
:
The unit is in the error state and cannot work. In this case a restart
or re-calibration is necessary.
LED5 Lights up when the relay is switched ON (sensor electrode busy).
LED6 Is the <in operation> indicator and lights up when the supply voltage is switched ON.
2.4 Installation
2.4.1 Starting manual adjustment - switch SW2-2 to "OFF"
The adjustment evaluates and saves the reference value of the system.
!
The sensor electrodes must be free when performing a new adjustment! No objects or
person may be near the sensor electrodes.
SW
-
= OFF:
(Memory OFF)
After power ON, the evaluation unit automatically starts a calibration process.
SW - = ON:
(Memory active)
The unit starts without adjustment. The operating parameters are restored from
memory and they are exactly the same ones when the unit was powered DOWN.
New adjustment can be done by pressing the SW1 button for more than 5s.
LED2 provides information on the elapsed time when pressing SW1: After 2s, it
lights UP and after 5s it goes OFF again.
The following applies to the adjustment :
– During the calibration process, LED4 blinks slowly.
– The calibration process has been successfully completed when LED4 stays
OFF and LED1 blinks
slowly.
–
If no bias point can be found during the adjustment, the evaluation unit changes to the error state.
This is indicated by the constant
lighting of LED4. The error state must then be corrected and a
new adjustment must then be carried out.
– An adjustment process can take up to 0 seconds.
Regardless of the setting of SW2-2, an adjustment process can be done at any time by pressing the
SW1 button at least for 5s.
2.4.2 Sensitivity setting (relay switching point)
!
To guaranty safe functionality, the sensitivity should only be set as high as necessary!
The setting of the sensitivity with SW1 takes place basically with the smallest objects that
enters on the detection area. When setting, the object to be recognized must stay in the de-
tection area.
Attention: People must not be near the sensor electrode!

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There are two possible configuration methods:
1.
Automatic: Pressing the SW1 button for 2s… 3s when the LED2 lights up.
With a small time delay, the unit adjusts the sensitivity to match the object in the
detection area. If the relay was previously switched OFF, it now switches ON. Case
the relay was already ON, it stays ON until the object is rem
oved from the detection
area.
. Manual: ● If the relay is OFF (LED5 is OFF)
Rotate switch SW1 clock-wise until the relay switches ON, then go three
points
further.
●
If the relay is already ON
(LED5 ON)
Rotate switch SW1 anti-clock-
wise until the relay switches OFF (LED5 OFF).
Then return until the relay switches ON again (LED5 ON) plus three points.
If necessary, the sensitivity can be adjusted manually at any time by turning the switch SW1. The
sensitivity setting is saved and valid even after unit power down.
2.5 Technical Data
Parameter
Sim
Condition
min
tip
max
Unit
Supply Voltage U
V
AC/DC 18 24 30 V
Operation Power I
V
18V ≤ U
V
≤ 30V 3 W
Environment Tempera-
ture
T
F
In operation -15 +20 +55 °C
T
L
Storage -20 + 0 °C
Switching point hysteresis
SW2-1 = OFF 5 %
SW2-1 = ON 10 %
Conductor cross-section Ø X1
X2
X3
solid
or
flexible
Without termina-
tion
0,2 2,5 mm
2
24 12 AWG
Termination with
cap 0,25 1,5 mm
2
Termination
without cap 0,25 2,5 mm
2
Isolation length X1, X2, X3 9 10 mm
Relay contact Voltage 250 300 VAC
24 250 VDC
Current (external protected) 10 A
Contact resistance 0,1 Ω
Case L Length 1 0 mm
B Wide 80 mm
H High 55 mm
Material Poly-carbonate
Protection level IP 5 / DIN 40050
Color RAL 7035
Con-
nectors
Pin Connection
X1 1 24V
AC/DC
Supply voltage The polarity is interchanged.
2
3 PE Earth potential Connected to the mounting structure of the
sensor electrodes.
X2 1 C Relay common contact
2 NO Relay normally open contact
3 NC Relay normally closed contact
X3 1 Core On measurement electrode connected Coaxial cable
2 Shield On the opposite electrode connected

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3 Montage & Cabling
Figure 3
3.1 System arrangement
The sensor electrodes must be manufactured as described in chapter "2.2 Sensor Electrodes".
The following basic rules apply to the assembly of the system:
● Montage and adjustment should only be done by qualified person.
● The sensor electrodes should be installed in such a way that the measurement electrode stays
as close as possible to the objects to be detected. This ensures safe switching behavior.
●
The evaluation unit should be installed near the sensor electrodes. The sensor line (coaxial cable
between the evaluation unit and sensor
electrodes) should be limited to a maximum length of 100
cm.
● The device may only be operated with the plastic cover closed!
Before connecting the coaxial cable to the electrodes, check that:
– there is no short circuit between measurement electrode "A" and its opposite "B",
– there is no electrical connection between the electrodes and the mounting structure "C",
– there is no electrical connection to the machine ground.

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3.2 Electrical connections
● Sensor Electrodes: – Coaxial Cable Shield: from the evaluation unit X3/2 to the opposite elec-
trode "B".
–
Coaxial Cable Core: from the evaluation unit X3/1 to the measurement
electrode "A".
● Evaluation unit: – Connect X1/1 and X1/2 to the power supply (24V AC / DC).
The polarity ± doesn’t matter.
–
Connect X1/3 to the earth of mounting structure "C" using a separate
cable.
No additional connection to the earth potential is admitted from
here! X1/3 is not used for safety grounding, but exclusively for ref-
erence potential at the sensor electrodes.
– Connect X2 (relay contacts) to the higher-
level control system according
to their function.
–
Connect X3/1 to the sensor electrode "A" through the internal conductor
of the coaxial cable.
– Connect X3/2 to the opposite electrode "B" through the shield of the co-
axial cable.
4 Installation
1.: Produce and install the sensor electrodes as described in chapter "2.2 Sensor Electrodes".
2.:
Place Electrodes and evaluation unit as close as possible. Connection cables may not exceed
100cm.
3.: Check and make sure that there is NO:
– short circuit between the electrodes,
– electrical connection between measuring or opposite electrodes and mounting structure.
– electrical connection to the machine ground.
4.: Connect the coaxial cable to the sensor electrodes. The core goes to the measurement elec-
trode and the shield to the opposite one.
5.: Connect the reference potential of the evaluation unit X1/3 direct to the earthed mounting struc-
ture.
.: Connect the supply voltage (24VAC / DC) to the evaluation unit (X1/1, X1/2).
7.: First operation
By the first operation an adjustment must be made. The state of the detect area will be evaluated
and saved as a reference.
!
The detection area must be free to process adjustment! No working piec
es, stored objects or
people may stay around, since they influence the adjustment signal.
a
)
Switch on the evaluation unit
. The green LED must light up.
b
)
Carry out adjustment
The adjustment behavior of the evaluation unit depends on the switch SW2-2 settings:
SW2-2 OFF After first switching ON, the evaluation unit starts an automatic adjustment.
SW2-2 ON The
adjustment is not
automatically
carried out. Adjustment must be forced
by pressing the SW1 button for at least 5s.
The elapsed time can be
seen on the behavior of LED2: After 2s, LED2 lights
UP and after 5s it goes OFF again. The adjustment process starts shortly. The
button SW1 can now be released.
With SW -
= ON, the operating parameters from the last application still
apply. This can lea
d the unit changing to the error state. The red LED4
then indicates this state by permanently lighting.
– The red LED4 blinks during the adjustment process.
–
The adjustment process has been successfully completed when LED1 blinks (1 / s).
– If no
working point is found during the adjustment, the evaluation unit changes to the error
state. This is indicated by the constant lighting of the red LED4.
8.: Place the working object in the sensing area.

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9.: Set sensitivity:
Depending on the currently
sensitivity value, the positioned object can switch the relay ON via
the sensor electrodes, or the relay remains switched OFF. The red LED5 lights up to indicate
when the relay is switched ON.
In any case, the sensitivity must be set to match the working object as described below.
!
For proper functionality, the sensitivity should only be set as high as necessary!
There are two possible methods of setting the sensitivity:
1.
Automatic:
The evaluation unit adjusts the sensitivity to match the
positioned object in the
detection area. If the relay was previously switched OFF, it switches on. If it was
already ON, it will keep ON until the object is removed.
The procedure is as follows:
– Place the object in the detection area.
– Press button SW1 for 2s… 3s
After 2s, LED2 lights up indicating 2s gone.
– Release button SW1.
LED2 goes out. You now have 3 seconds to move away from the area of the
sensor electrodes, so that, your presence does not influence the measure-
ment of the object.
When 3s are done, the optimum sensitivity for the working object is set. LED2
confirms the process by flashing briefly.
.
Manual:
–
Relay OFF (LED5 OFF):
Rotate the switch SW1 clock-wise until the relay switches ON, plus three
more points.
–
Relay ON (LED5 ON):
Rotate switch SW1 anti-clock-
wise until the relay switches OFF (LED5 OFF),
then return until the relay switches ON again (LED5 ON) plus three points.
Case the current sensitivity shows impractical, it can be adjusted manually at any
time by turning
the switch SW1.
The new sensitivity setting is saved and also effective by the next time the evaluation unit is
switched ON.
Function Explanation (Turning OFF without memorization)
Case the detector device is switched OFF while the memory function is inactive and an object is left
in the detection area, the device “ignores” this condition. In this case, when the device is switched
ON again, it will proceed with a new adjustment considering free detection area and the relay will
stay OFF.
To be sure about this procedure, one can move his hand to the detection area to see the relay turning
ON. After removing the object and subsequently the hand from the detection area, the relay turns
OFF again and around 2s later the new conditions will be detected by the device as empty area.