A S 8 Operating Instructions
Contents
1. PAGE 24 BAS8 0006 08 01 GB 10 AS8 as 19 Rack Unit The AS8 is built into a 3HE 25TE 19 front plate All the connections for the AS8 are wired on a Eurocard and are available on a 32 pin contact strip for further connection AS8 wiring on the contact strip Contact PIN AS8 terminal ac2 8 24 Volt sensor supply ac4 10 Channel 1 ac6 v lt 11 Channel 2 ac8 v 12 Enable summation actQ 13 Enable printer aci ee 14 TXD Analogue output ac14 5 15 RXD Analogue output ac16 5 Relay contact 1 act v 6 Relay contact 2 ac20 ac22 nn 2 N ac24 e 1 L ac26 III 3 PE ac28 ac30 gt 7 Relay contact base ac32 2zeztt HE gt 9 0 Volt BAS8 0006 0801 GB Page 25 11 AS8 in the Desk top Housing The desk top housing is available with analogue output or serial interface View FRONTANSICHT Inm 205 RUCKANSICHT MIT RS 232 PAGE 26 LL wl 5 N co ee v kia cO 5 151 R CKANSICHT MIT ANALOGAUSGANG INGANG ig Hos ANALOGAUSGANG VC mui Pre PU Roi Hm HT BAS8 0006 08 01 GB Connections with RS232 serial interface RS 232 VC EINGANG DIGITAL I O TOTALISATOR KRAC2. A 0 sets flow rate measurement and a 1 sets volume measurement see 4 1 Overview of the input values A maximum value can be programmed for the analogue output The maximum value corresponds to an output of 10 V and 20 mA The details of programming the maximum value are given in section 4 6 CS What must be programmed when connecting the analogue output PAGE 10 BAS8 0006 08 01 GB 3 5 Connecting the printer The AS8 makes use of a serial interface having an RS232 layout The choice between analogue output or serial interface is made by means of a jumper inside the unit Setting for the serial interface JP3 d JP5 00 A The RS232 has the fixed setting 9600 baud 8 bit No parity XON XOFF There is no hardware handshake Transmit data Receive data RXD Functional earth TXD GND RS 232 Terminal 14 Terminal 15 The interface can be operated as a printer interface and for parameterising the AS8 There is no switch over between the operating modes In the printer interface operating mode the selected data is output as ASCII characters via the serial interface The instantaneously displayed value is printed out each second followed by a CR LF Example Displated value ASCII String 3 500 3 500 2B 33 2E 35 30 30 0D 0A 3 5 1 Which data can be printed out The currently displayed value is printed out 3 5 2 How is the data printed out A printout is triggered via a digital input The va
3. Ambient conditions Operating temperature Storage temperature PAGE 20 gt 7500 Ohm low lt 9 Volt high gt 12 Volt typ 1 ms Set as voltage or current output via jumpers 10 Volt O 10 Volt 2 10 Volt load gt 1 kOhm Resolution 10 bit short circuit proof 20 mA 0 20 mA 4 20 mA load lt 250 Ohm Resolution 10 bit short circuit proof gt 7500 Ohm low lt 9 Volt high gt 12 Volt Period of oscillation measurement rising edge 1Hz 2500 Hz 2 x 10 pulses Screened data cable recommended Cable length lt 15 m max 30 V typ 3 mA at 9 V input voltage typ 3 mA 9600 baud 8 bit no parity 1 stop bit Screened data cable recommended 0Cto 60 C 25 C to 85 C BAS8 0006 08 01 GB 6 Type code Example AS8 U 230 F keys on front panel Identification for special programs DOS ZM RP PUR V2F V2C A2F D2F FM20 Without Dosing Cylinder stroke measurement Flow control loop Ratio control loop Flow rate and ratio measurement Volume ratio measurement Sum measurement Difference measurement Flow rate measurement switchable for all KRACHT volume counters Standard Flow rate or volumetricmeasurement specification 230 120 12 24 LLL a LJ BAS8 0006 0801 GB RS 230 VAC 50 60 Hz 120 VAC 50 60 Hz 12 VDC 24 VDC Voltage output 10 Volt Current output 20 mA Serial interface RS232 P
4. On actuating F1 the display reverts to the menu reference level The menu reference 00 is displayed again Stop input value To exit the input operation depress F1 again for approx four seconds BAS8 0006 0801 GB Page 13 4 1 Overview of the input values The values which are required to be set can be inserted in the column labelled Input value User a seting User 0 040 Pulse volume of volume counter E m eee eee 02 j0001 Damping Digital filter O3 9999 jfPulimvaue Rlayi 04 9999 Drop out value Relay 1 05 9999 jfPulimvaue Rely2 O 06 0999 Drop out value Relay 2 07 0000 L 5 Display 0 Flow rate 1 Volume Analogue output 0 Flow rate 1 Volume Relay 1 0 Flow rate 1 Volume o 2 0 Flow rate 1 Volume 0000 p Counter input 0 2 channels 1 1 channel Error display 0 Activated 1 Blocked e output 0 Bipolar 1 Unipolar ee u m output 0 0 20mA 7 1 4 20 mA If the on and off values for the relays are set at 9999 then the relays are isolated PAGE 14 BAS8 0006 08 01 GB 4 2 What must be programmed when connecting a volume counter The AS8 Microcontroller is set up for the connected volume counter This is carried out under menu reference 00 pulse volume volume counter and under menu reference 08 at the position counter input The pulse volumes for KRACHT Volume counters
5. can be obtained from the Table The X characters in the Input value Menu reference 08 column are of no significance in setting the volume counter Designation Material Input value Input value Menu reference 00 Menu reference 08 es eee o Sp Gr Iron Spheroidal graphite iron High grd St High grade steel Example A VCO 04 volume counter is connected The pulse volume is 0 040 cm The VC 0 04 Volume counter has a 2 channel layout B The value 0 040 is entered under menu reference 00 m A 0 is entered under menu reference 08 at the position designated counter input BAS8 0006 0801 GB Page 15 4 3 Which display parameters can be represented DIP switches The physical parameters I h m s and Usgal h Usgal m Usgal s can be set as display units Switching between the display parameters is achieved using the DIP switches The DIP switches are located behind the front cover Setting the volume Factory setting Indication in LITRES Indication in USGAL Setting the time base OFF ON Minutes ON OFF Hours ON ON jSecnds In principle parameters such as Millilitres Grams Millimeters Meters and Kilograms can also be displayed These can be set via the pulse volume Example Volume counter connection VC 1 Unit Pulse factor Conversion Density Pulse volume Volume counter factor mediu
6. display position The error display is enabled with a 0 and blocked with a 1 see 4 1 Overview of the input values PAGE 12 BAS8 0006 08 01 GB 4 AS8 programming Each time the AS8 is to be operated it is necessary to adapt the unit to the volume counter that is connected Input procedure The input procedure is the same for all input values and is therefore described once only Programming is carried out by means of three keys which are accessible on removing the front cover With the keyboard version F the configuration can be made with keys on front panel The positions of these three keys is shown below I DIP Switch a rl Far Oy oe mE Fr 173 1 J o o F2 F3 Start input operation F1 is depressed for approx four seconds to start the input operation The first three segments are switched dark segments four and five display the menu reference number 00 Release F1 Change menu reference By briefly pressing F1 the menu reference numbers 00 to 08 can be displayed in sequence An input value is concealed behind each menu reference number To display the input value press F3 briefly A four digit input value appears Change input value The point marks the digit which can be changed by actuating F3 The point can be moved by actuating F2 After setting the numerical values the point must be placed at the correct position
7. is switched so long as the switch off value is not reached The switch on value of 0 000 has the consequence that only the switch off value is evaluated The relay is not switched off if the switch on value is reached Window function Example Switch on value 2 500 Switch off value 3 000 The relay contact is switched when the switch on value is reached If the switch off value is exceeded the relay opens again PAGE 18 BAS8 0006 08 01 GB 4 6 What must be programmed when connecting the analogue output The function of the analogue output is selectable The analogue output can be assigned to flow rate or volume measurement Flow rate measurement A 0 is entered under menu reference 7 This takes place at the position designated Analogue output see 4 1 Overview of the input values Volume measurement A 1 is entered under menu reference 7 This takes place at the position designated Analogue output see 4 1 Overview of the input values Signal selection Menu reference 08 Analogue output 00XX 20 mA or 10 Volt 01XX 0 20 mA or O 10 Volt 10XX 20 mA or 10 Volt 11XX 4 20 mA or 2 10 Volt The digits identified with an X in the Menu reference 08 column are of no significance to the setting procedure The maximum value is entered under the menu reference 01 maximum analogue output corresponding to an output of 10 V or 20 mA Example Maximum ana
8. 8 Operating AS Instructions KRACHT Volutronic 1 SAFETY 3 2 DESCRIPTION 4 3 CONNECTING THE AS8 5 3 1 Connecting the voltage supply 5 3 2 Connecting the volume counter 5 3 2 1 How is the flow rate measurement activated 7 3 2 2 How is the volume measurement activated 7 3 3 Connecting the relay contacts 8 3 4 Connecting the analogue outputs 9 3 5 Connecting the printer 11 3 5 1 Which data can be printed out 11 3 5 2 How is the data printed out 11 3 6 Parameterising via the serial interface 12 3 7 Error display 12 4 AS8 PROGRAMMING 13 4 1 Overview of the input values 14 4 2 What must be programmed when connecting a volume counter 15 4 3 Which display parameters can be represented DIP switches 16 4 4 How is the display set 17 4 5 What must be programmed when connecting the relay outputs 18 4 6 What must be programmed when connecting the analogue output 19 5 TECHNICAL DATA 20 6 TYPE CODE 21 7 CONNECTIONS 22 8 SETTING THE SUPPLY VOLTAGE 23 9 DIMENSIONS 24 10 AS8 AS 19 RACK UNIT 25 11 AS8 IN THE DESK TOP HOUSING 26 PAGE 2 BAS8 0006 08 01 GB 1 Safety The safety notes included in these operating instructions are indicated by A this attention getter symbol If the text accompanying this symbol is not heeded danger to personnel or equipment may result cg Other instructions which are not safety warnings but which give advice on optimum operation are indicated by a h
9. HT GMBH PIN 4 6 BR CKE PIN 4 424V INTERN PIN 4 24V INTERN RESET PIN 7 8 BR CKE PIN 2 KANAL 4 PIN 2 GNOCINTERN PIN 2 TXD PIN 3 KANAL 2 PIN 3 RESET TOTALISATOR PIN 3 PXD PIN 4 GND INTERN PIN 4 GEM POTENTIAL DRUCKER PIN 5 GND PIN 5 SCHIPM PIN 5 KI KONTAKT PIN 6 K2 KONTAKT ETN AUS Si 100 mA 250 V Connections with analogue output ANALOGAUSGANG VC EINGANG DIGITAL I O TOTALISATOR KRACHT GMBH PIN 4 40V PIN 4 24V INTERN PIN 4 24V INTERN RESET PIN 4 GNO INTERN PIN 2 KANAL 4 PIN 2 GND INTERN PIN 3 KANAL 2 PIN 3 RESET TOTALISATOR PIN 4 GNDLINTERN PIN 4 GEM POTENTIAL PIN 5 SCHIRM PIN 5 K1 KONTAKT gj PIN 6 K2 KONTAKT 1 400 mA 250 V BAS8 0006 0801 GB Page 27
10. age 21 7 Connections The electrical connections are made on plugable screw terminals Stranded connections on the basis of the prevention of accidental contact Q in accordance with VDE 0411 Part 100 only by means of connector sleeves with insulating material caps Non factory wired connections should not be otherwise connected It is recommended that all signal connection leads are screened and the screening earthed on both sides in order to avoid HF interference The signal connection leads should not be combined in the same cable assembly as mains cables motor cables etc JP2 JP1 Printer interface or Analogue output Enable printer Enable summation Channel 2 Channel 1 9 JP3 JP5 fag DO 24 Volt Relay contact base Relay contact 2 Relay contact 1 Screen PE Power Supply 12VDC 24VDC or 120VAC 230VAC TRANSFORMER or DC DC converter ooooooooooooooQo Printer interface Analogue output RXD Analogue output TXD 14 9 Analogue output GND PAGE 22 BAS8 0006 08 01 GB 8 Setting the supply voltage Supply voltage 230 V AC 50 60 Hz View of circuit board from below Close solder jumper 1 to 3 m HB BBB supply voltage 115 V AC 50 60 Hz View of circuit board from below Close solder bridges 1 to 2 and 3 to 4 Oo m m Oo Oo Oo Oo o Oo Oo Oo m Oo m o BAS8 0006 0801 GB Page 23 9 Dimensions TAFELAUSSCHNITT CUTOUT LD lt 92
11. and General safety instructions The electronic AS8 is constructed to the latest standards in technology The AS8 should be operated only W in technically sound condition m as instructed B with awareness of the safety precautions following these operating instructions The AS8 must only be operated as an item of equipment installed in an internal area The AS8 must only be operated in the prescribed condition The stated limiting values see also section on Technical Data must under no circumstances be exceeded Personnel engaged in the installation operation and maintenance of the AS8 must be appropriately qualified This qualification can be obtained by appropriate training or instruction Such personnel must be familiar with the contents of these operating instructions During all operations the relevant national regulations relating to safety precautions in the work place and where applicable internal regulations of the operator must be observed even if these are not detailed in these operating instructions The AS8 must not be operated in hazardous areas nor in areas where medical apparatus is in use nor in areas which are expressly named in VDE 0411 Part 100 If the AS8 is used for the control of machines or sequential processes where damage to the machine or accident to operating personnel is possible as a consequence of failure or faulty operation of the AS8 then appropriate safety precautions must be imple
12. ction 4 5 What must be programmed when connecting the relay outputs PAGE 8 BAS8 0006 08 01 GB 3 4 Connecting the analogue outputs The AS8 operates via an analogue output or a serial interface The appropriate adjustment is achieved within the device by means of jumpers The jumper settings for current output and voltage output are shown in the accompanying figures Current output setting JPa _ To JP5 ell CE The strength can be set on P1 and the offset on P2 Voltage output setting Jes d JP5 00 S The strength can be set on P3 and the offset on P2 In accordance with the software the settings 10 Volt 0 10 Volt and 2 10 Volt and 20 mA 0 20 mA and 4 20 mA are available for signal selection The selection is carried out by programming the AS8 under menu reference 8 at the Analogue output position The functions are set using 0 or 1 see 4 1 Overview of the input values CCS PLUS Analogue output Terminal 14 Terminal 15 How does the analogue output function BAS8 0006 0801 GB Page 9 The function of the analogue output can be freely selected i e it can be assigned to the measurement parameters of flow rate or volume The display the relay and the analogue output can be switched to flow ee rate measurement or volume measurement as required This selection takes place when programming the AS8 under menu reference 7 at the analogue output position
13. ion sensors Sensor supply A The sensor supply is not short circuit proof The sensor supply is connected to connections 8 and 9 However the S sensor supply must not be used for the supply of unearthed inductances or capacitive loads BAS8 0006 0801 GB Page 5 Voltage Ripple Maximum permissible current Terminal 9 OV Signal inputs 24 VDC 20 load dependent Measuring systems with incremental signals provide two square wave pulses The square wave pulses are displaced from one another by 90 It is therefore possible to detect the direction This is referred to as a two channel layout If a measuring system with one square wave output is available it is referred to as a single channel layout In this case direction detection is not available Single channel or two channel connection must be set on the AS8 The ee settings required are made under menu reference 08 at the meter input position see 4 1 overview of the input values Connection of the signal inputs is made on terminals 10 and 11 Connection terminal 11 is not used on the single channel layout sd Channel 1 Channel 2 Terminal 10 Terminal 11 The measurement parameters of flow rate and volume are derived from the square wave signals The terms volume measurement and flow rate measurement are often CE interchanged however they are two completely different measurement parameters The indicator the relay and the analogue outpu
14. logue output value 4 000 Litres minute The flow rate is 4 000 Litres minute so 10 Volt or 20 mA are output If the flow rate is 0 000 Litres minute then 0 Volt or 0 mA is output BAS8 0006 0801 GB Page 19 5 Technical Data PIC 17042 Power pack Supply Power consumption Sensor suppl General data Display Control keys Housing Front frame Installed depth Panel cut out Protection class DIN 40050 Weight Connections 230 V AC 6 10 50 60 Hz optional 115 V AC ca 3 5 W 24 V DC 20 50 mA Principle 7 Segment LED 13 2 mm red Display 0 000 9999 with floating point overrun gt 9999 display 9999 overrun lt 9999 display 9999 Status indication LED K1 and K2 for relays 1 and 2 Three keys behind the front cover optional keys on front panel Control panel housing in plastic 96x48 mm DIN 43700 ca 122 mm with terminal strip 92x45 mm Tol 0 8 x 0 6 mm IP 54 with appropriate control panel installation ca 0 4 kg 15 pole screw terminal strip Relay contacts each 1 N O 24 Volt 1 A typ operating time 6 ms Digital inputs Input impedance Input amplitude Operating time Analogue outputs Voltage output Current output Volume counter inputs Input impedance Input amplitude Measuring principle flow rate Maximum input frequency Measuring range totalisator Serial interfaces HS 232 Input voltage Input current Output current Setting Cable
15. lues are transferred to the serial interface in a per second sequence The printer drive is switched on on the application of a voltage of 24 V at er the enable input terminal 13 BAS8 0006 0801 GB Page 11 3 6 Parameterising via the serial interface A PC or a PLC is connected to the AS8 via the serial interface The PC or PLC can change specific AS8 parameters by means of an ASCII character string The unit distinguishes between the different values through an identifying letter No protocol is used The character string is received complete as an ASCII string and converted on acceptance ASCII strings can only be received one after the other If a faulty string is received an ERROR string is sent Example Identifying letter Input value ASCII STRING A Pulse size volume counter A0 040 41 30 2E 30 34 30 IB Maxvalue analogue output B3 500 42 33 2E 35 30 30 Damping digital filter C9999 43 39 39 39 39 2E ID J j fPulkin value Relay 1 D0 000 44 30 2E 30 30 30 E1 000 F1 500 G3 000 ERRORO 3 7 Error display On two channel volume counters it is possible to monitor the correct pulse sequence on the channels Faulty pulses are not counted and thus do not change the volume measurement If an error is established by the AS8 the character sequence FAUL appears in the display The error display can also be completely isolated This is carried out ee under the menu reference 08 at the Error
16. m Menu reference 00 Millilitres x 1 000 Grams x 1 230 Kilograms x 1 230 Units of length are converted in the same way Example Measurement of the speed or position of a cylinder VCimounted on the piston Piston diameter 10 cm gt A 10 cm x 10 cm x PI 4 78 54 cm Factor VC 1 036 cm Factor for each pulse En Hueso depen 0 01319 cm 0 1319 mm Area A 78 54 cm RES Unit Factor for each Conversion pulse volume pulse factor Menu reference 00 Millimetres 0 1319 x 1000 131 9 Metres 0 1319 x 1 0 132 pue PAGE 16 BAS8 0006 08 01 GB 4 4 How is the display set The display can be set for flow rate measurement or volume measurement Flow rate measurement A 0 is entered at the position designated Display under the menu reference 07 see 4 1 Overview of the input values Filter function The measuring principle applied to the AS8 is that of period of oscillation When the flow rate is subject to severe fluctuation the digital filter provides a smoothing effect to steady the indication A digital filter can be activated under the menu reference 02 The higher the input value the greater the filter effect Programmed value 0000 no filter effect Programmed value 9999 maximum filter effect Volume measurement A 1 is entered at the position designated Display under the menu reference 07 see 4 1 Overview of the input values The pulses of
17. mented In the case of variations including those relating to operating behaviour CE which prejudice safety the AS8 must be switched off immediately gt P P During installation work on the AS8 the power supply must always be disconnected Installation work must only be carried out by appropriately qualified personnel BAS8 0006 0801 GB Page 3 2 Description Measuring equipment devices in the AS8 series are four segment indicator units for flow rate and volumetric measurement The units are usually operated in conjunction with KRACHT volume counters However other measuring systems with incremental signals can be connected These may for example be oval wheel meters or angle of rotation sensors The incremental input signals are filtered converted and translated by the micro controller into the physical quantities of flow rate and volume Two relays an analogue output or an RS232 serial interface are available for additional external processing Programming and adjustment is achieved by means of three keys which are accessible on removal of the front cover The integrated 24 V DC sensor supply enables direct connection to the volume counter The measuring devices in the AS8 series are obtainable as built in control panel devices as desk top units or as 19 rack mounted units The variety of characteristics and alternatives available make this compact unit always the first choice particularly from the viewp
18. oint of cost saving and when there is a special requirement to determine flow rate and volume Manufacturers address KRACHT GmbH GewerbestraBe 20 58791 Werdohl Tel 02392 935 0 Fax 02392 935209 PAGE 4 BAS8 0006 08 01 GB 3 Connecting the AS8 This section deals with the layout of the connections on the AS8 The electrical connections are made on a screw terminal strip The connection layout for the desk top unit and the 19 rack mounted unit versions are covered in sections 10 and 11 3 1 Connecting the voltage supply The AS8 is operated with an alternating voltage of 230 V 115 V AC or direct voltage 12 24V DC Please specify the kind of power supply when ordering The exact type can be found in chapter 6 Type code The connections for alternating current voltage 120 230V AC IN Terminal2 PE j Termminal3 The connections for direct voltage 12 24V DC GND Terminl2 PE Temia3 DO A Fire The unit should be protected by an external fuse on the prevention supply side In accordance with VDE 0411 in the event of failure 8A 150 VA must not be exceeded The recommended external fusing is 100 mA at a supply voltage of 115 and 230 Volt 3 2 Connecting the volume counter The ASR16 is preferably operated in conjunction with KRACHT volume counters However other measuring systems with incremental signals can be connected These can be for example oval wheel meters or angle of rotat
19. s again The AS8 must be set for the particular volume counter that is connected ee The procedure is given in section 4 2 What must be programmed when connecting a volume counter BAS8 0006 0801 GB Page 7 3 3 Connecting the relay contacts The AS8 has two relay contacts The relays are designed as potential free contacts That is to say the user must input the potential at the base terminal A The relays are provided with normally open contacts The switching voltage is 24 V maximum switching current is 1A Voltages greater than 48 V must not be switched on any account Relay Contact Signal Common terminal Base How do the relays operate The function of the relays can be set as required i e each relay can be allocated to the flow rate or volume measurement parameters The relays can be set as required to flow rate measurement or volume S measurement Thhis is achieved in the programming of the AS8 under the menu reference 7 at the Relais 1 or Relais 2 position A 0 sets the flow rate position a 1 sets the volume measurement see 4 1 Overview of the input values An on and an off switching value can be programmed for each relay The relay switches when the switch on value is exceeded When the switch off value is undershot the relay drops out again The relays can be programmed as normally open or normally closed The programming of the switch on and switch off values is given in se
20. t can be switched between Ee flow rate measurement and volume measurement as desired This is achieved in the programming of the AS8 under the men reference 7 A 0 is set for flow rate measurement and a 1 for volume measurement see 4 1 Overview of the input values PAGE 6 BAS8 0006 08 01 GB 3 2 1 How is the flow rate measurement activated As soon as a medium flows through the volume counter a flow rate indication appears No special action is required The instantaneous flow rate is indicated as a rule in litres per minute The AS8 must be adjusted to the actual volume counter that is connected er The procedure is given in section 4 2 What must be programmed when connecting a volume counter 3 2 2 How is the volume measurement activated By volumetric measurement is implied the summation of the amount of a medium which has flowed through a volume counter As a rule the indication is in litres The summation commences when the summation enable is switched ee The enable input is connected to terminal 12 If there is a voltage of 24 V at the enable input summation of the volume er commences The measured values on the display change If there is a voltage of 0 V at the enable input summation of the volume is stopped The measured values on the display do not change When the voltage at the enable input is changed from 0 V to 24 V the summation is reset to zero The determination of the volume start
21. the volume counter are counted converted using the pulse volume and displayed BAS8 0006 0801 GB Page 17 4 5 What must be programmed when connecting the relay outputs The relay function is selectable A relay can be allocated to flow rate or volume measurement Flow rate measurement A 0 is inserted under the menu reference 07 This takes place at the position designated Relay 1 or Relay 2 see 4 1 Overview of the input values Volumetric measurement A 1 is inserted under the menu reference 07 This takes place at the position designated Relay 1 or Relay 2 see 4 1 Overview of the input values Switch functions For Relay 1 programming takes place under the menu references 03 and 04 for Relay 2 under the menu references 05 and 06 see 4 1 Overview of the input values The following switch functions can be obtained Normally open function On reaching the switch on value the contact is closed Example Switch on value pull in 2 500 Switch off value drop out 9999 The relay contact is switched when the switch on value is exceeded The switch off value of 9999 has the consequence that only the switch on value is evaluated The relay is not disconnected when the switch off value is reached Normally closed function On reaching the switch off value the contact is opened Example Switch on value 0 000 Switch off value 3 000 The relay contact
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