Operating Instructions for the S - SW 3 Capacitive Threshold Switch
Contents
1. Voltage supply 24V DC 10 24VAC 10 50 Hz Power consumption approx 2 3 VA Output floating relay contact changeover contact max 230 V 4 A fuse externally Temperature range within 20 and 55 C Dimensions 160 x 80 x 55 mm LxWxH Casing Makrolon IP65 DIN 40050 RAL 7035 7 Other Relevant Detail Installation and adjustment shall be carried out by qualified personnel only Do not operate the switch unless the plastic cover is closed Our guarantee does not cover malfunctions due to faulty installation or manipulation at the coil cores on the p c b UNICONTROL Electronic GmbH Mannheim 23 May 2000 Page 3 4 S SW 3 tmd Spacer A Spacer age 47 4 SENSOR PLATE ZE v N a Setting a potentiometer Cable Cable screen core Refer ado potential PE Mounting carrier Threshold Suitch S SW A ev 21 08 2000 15 06 322. Operating Instructions forthe S SW3 Capacitive Threshold Switch Unicontrol Electronic GmbH 23 May 2000 1 Function The capacitive threshold switch S SW 3 is typically used for roller conveyor control applications in rolling mills in sandblasting plants or the like This switch detects and evaluates the presence of metal parts and other conductive objects within its sensing range Contamination of the electrodes which may be caused by slag metal dust or a thin layer of abrasives will not affect the proper function of the capacitive threshold switch The device consists of two parts Sensor unit housed in a plastic casing and a Sensor electrode The sensor electrode is not included in the unit of supplied It is dimensioned by the user based on the specific requirements of the application at hand The shape of the electrode determines the sensing range 2 Sensor Uni The sensor unit part is housed in a IP65 DIN 40050 Makrolon casing Two cable inlets are available for making the electrical connections PG9 24V DC or AC voltage supply and relay output PG 7 connection to sensor plate coaxial cable The voltage supply and the relay output are applied to the two 3 pole plug type terminals X1 and X2 X1 1 and 2 24V 10 X1 3 reference potential machine casing or PE conductor X2 floating NO contact changeover contact max 230 V 4 A If an inductive consumer is to be connected to X2 proper interferenc
3. e suppression is required Connect the cable for the sensor plate to the 2 pole sensor terminal Use an RG58 50 ohms coaxial cable or similar mandatory Connect the cable core to the left terminal X3 1 and the cable screen to the right terminal X3 2 as shown in the drawing Page 1 4 S SW 3 tmd 3 Sensor Plate The sensor plate must include Sensing electrode A Counter electrode B Mounting carrier C Spacer D The electrodes are made of conductive metal steel aluminum etc The thickness d of the material is non critical and is adjusted to match the dimensions required Possible dimensions are Sensing electrode and counter electrode same dimensions Width a min 30mm max 200 mm Length b min 30 mm max 4000 mm The type of mounting carrier depends on the type of mounting or application Spacer D is a plastic bolt as indicated in the drawing min 20 mm max 50 mm The sensor plate is mounted in such a way that the sensing electrode is as close to the objects to be detected as possible This ensures safe and reliable switching performance 4 Startup Mount the sensor plate as described under Item 3 Mount the electronics equipment so that the sensor cable coaxial cable is not longer than 70 cm standard cable 50 cm in length included in the scope of supplies Before connecting the coaxial cable check the electrodes to make sure that there is 1 No short circuit present between
4. the electrodes and 2 No electrical connection to the machine frame Connect the screen of the coaxial cable to counter electrode B and the cable core to sensing electrode A At first apply the supply voltage to X1 The green LED must go ON After a brief transient time of about one minute carry out the calibrated as follows 1st case The red LED is ON Turn the setting potentiometer GAIN in the MINUS direction see symbol on the printed circuit board until the red LED goes OFF and the relay drops out Now slowly turn the potentiometer back a little This is the point where Page 2 4 S SW 3 tmd the level of sensitivity is the highest The calibration procedure is completed 2nd case The red LED is OFF Turn the setting potentiometer GAIN in the PLUS direction see symbol on the printed circuit board until the red LED goes ON and the relay picks up Now slowly turn the potentiometer back a little until the LED goes OFF again and the relay drops out The calibration procedure is completed Follow this procedure to set the optimum level of sensitivity for the application at hand Parameter in Use the SW1 dip switch on the printed circuit board for setting the parameters You can set 3 parameters 12 3 a Switching hysteresis Hyst 2 Afri b Switching delay Delay GA n c Sensor plate size Sens size 5 Ag See drawing on the right for setting the FRG parameters A ET 6 Technical Data
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