System 6000 Electropneumatic Converters (proportional valves) Electronic Controllers Signal Converters

Transcription

1 System 6000 Electropneumatic Converters (proportional valves) Electronic Controllers Signal Converters Edition November 2003 Information Sheet T 6000 EN

2 Proportional valves e/p Converters Type Body style Rail-mounting unit 5) Field unit 7) Industrial unit Explosion protection EEx ia ATEX 9" rack-mounting unit, 7 HP 6) EEx ia, EEx d, ATEX, FM, CSA, Australian Standard ) Degree of protection IP 20 IP 54, IP 65, NEMA 4 IP 54, IP 65 IP 00 Field bus AS-Interface 4) Input 0 to 20 ma 4 to 20 ma 0 to 0 V 3) 2 to 0 V 3) Output 0.2 to bar 0.4 to 2 bar Special ranges up to 5 bar Special ranges up to 8 bar 2) Air supply 0.4 bar above upper signal pressure range, maximum 0 bar Max. 2.4 bar Electrical connection Phoenix terminal or male angle connector DIN A Pneumatic connection M0x,G 8; 8 NPT M20x NPT 4 NPT; G 4 Male angle connector DIN A 4 NPT; G 4 Electropneumatic plug connector Form F For further information, see Data Sheet: T 6 EN T 66 EN T 626 EN T 627 EN ) 2) 3) 4) 5) 6) 7) Further standards on request Not for EEx d devices With TROVIS 65 u/i Module With TROVIS 650 AS-Interface Module Also available as field unit with stainless steel enclosure Also available with two channels Special version for operation with natural gas on request 2 T 6000 EN

3 p/e Converters Type Body style Rail-mounting unit Rail-mounting unit Field unit Explosion protection EEx ia ), EEx d ) p/i converter unit or 2 Degree of protection IP 20 IP 20 IP 54, IP 65 Input 0.2 to bar Output 0 to 20 ma 4 to 20 ma 0 to 5 V to 5 V 0 to 0 V 2 to 0 V Power supply 230 VAC, 5 V AC, 24 V AC, 24 V DC 24 V DC Electrical connection Four wires Two wires Terminals for 0.5 to 2.5 mm 2 wires Terminals for 0.5 to 2.5 mm 2 wires M 20 x.5; 2 NPT; terminals for 0.5 to 2.5 mm 2 wires Pneumatic connection Hose connection 4 x Hose connection 4 x 4 NPT; G 4 For further information, see Data Sheet: T 632 EN T 634 EN ) Applied for Example of an application Type 632 ma Type 634 ma V 5 Transducer 2 Pneumatic converter 3 p/i converter 4 Controller 5 Two-wire network 3 T 6000 EN

4 Converter modules Type TROVIS 650 TROVIS 65 Designation AS-Interface module u/i module Intput AS-Interface 0 to 0 V 2 to 0 V Output 0 to 20 ma 4 to 20 ma Auxiliary power Over ASI line 6 to 30 V DC Electrical connection Male angle connector acc. to DIN A, M 20 x.5 (adapter connector) Input Auxiliary power Output Compatibility with SAMSON devices Positioners 3730, 3760, 376, 3767, 4763 V 200 valve 3372-IP i/p converters 6, 66, 626 R= U V H Max. load at the output: 300 Ω 20 ma e.g. 700 Ω at aux. power U H =24V For further information, see Data Sheet: T 650 EN T 65 EN Control level Field level Profibus PA, CAN, Interbus, DeviceNet, FIP, etc. MASTER GATEWAY SLAVE SLAVE SLAVE SLAVE SLAVE SLAVE ASI field level SAMSON Slave TROVIS T 6000 EN

5 Electronic Controllers Type TROVIS 6497 TROVIS 6493 TROVIS 642, TROVIS 6442 Style Panel-mounting unit Panel-mounting unit Panel-mounting unit (642) or 9" rack-mount. unit (6442) Degree of protection (front) IP 54 IP 65 IP 54 Inputs or 4 ma/ V Pt 00 (Pt 000, Ni 00, Ni 000) Thermocouple Potentiometer Transmitter supply Binary inputs 3 Outputs Continuous-action ouptut ma V On/off or three-step output or2 Analog output (with switching output) Limit relay 2 2 (with cont.-action output) 2 Binary output for alarm messages Binary outputs 2 (with cont.-action output) 2 Interfaces RS 485 RS 232 COPA pen Infrared Configuration program TROVIS-VIEW TROVIS 6482 Functions Fixed set point control Follow-up control Cascade control Limiting control Synchro control Ratio control P/PI/PID control Power supply 230/ 20/ 24 V AC 230/ 20/ 24 V AC 230/ 20/24 V AC, 24 V DC Refer to Data Sheet: T 6497 EN T 6493 EN T 642 EN 5 T 6000 EN

6 Application examples Controlling a positioning cylinder in the paper and printing industry The electric signal coming from a controller or a PLC (e) is converted to a pneumatic signal (p) by the e/p converter. The pressure signal is used to position a cylinder which, in turn, moves a roller that keeps the paper under a certain tension. e p Air Type 6 Controlling a valve Valves equipped with small pneumatic actuators can be controlled directly by an e/p converter. The e/p converter receives the electric signal from a controller or a PLC. The e/p converter can also control a pneumatic positioner. Type 324- TROVIS 6493 Field or industrial units can be mounted directly to a valve (attachment to rod-type yoke or according to NAMUR). e Air p Type 66 Pressure control The p/e converter measures the pressure in the pipeline and converts it to an electric signal. The controller uses the electric signal to calculate the control signal which is passed on by the positioner to finally close or open the pneumatic control valve. Type 324- e Type 634 p 6 T 6000 EN

7 Filling of liquids in the beverage industry and breweries The e/p converter converts an electric signal to a pneumatic signal. The pneumatic signal controls cylinders which insert filling tubes more or less deep, depending on the liquid level, into bottles, filling them with beverages or detergents. p e Air Type 626 To the PLC Booster control Boosters are used to amplify the flow rate of compressed air. To control boosters, you can use, apart from handwheels, also e/p converters which receive an electric signal from a controller or a PLC. Type 6 e Air p Applying. adhesive or glue Glue or adhesive is to be applied on different bases. Depending on the speed of the conveyor belt, varying quantities must be applied. The e/p converter receives an electric signal, which changes with the belt speed, and converts it to a pressure signal. The pressure causes the ball of a dispenser to adapt the outlet to the required amount of glue or adhesive. This ensures uniform application. Type 626 Air p e 7 T 6000 EN

8 Temperature control The SAMSON controllers TROVIS 642, 6493 and 6497 allow the realization of simple temperature control systems, e.g. flow temperature control in heating installations. The flow temperature is measured with a Pt 00 sensor and transmitted to the controller. The latter controls a pneumatic control valve by issuing an analog 4 to 20 ma signal via an i/p positioner. TROVIS 6493 TROVIS 6497 TROVIS 642 Mixing of two liquids TROVIS 642 can be used for ratio control when two liquids are mixed. The controller obtains signals from two differential pressure transmitters and root-extracts the signals. The controller then uses the signals to calculate an output signal for the control valve which must reach the required mixing ratio. PD TROVIS 642 F PD F Flow control TROVIS 642 and 6493 provide a convenient flow control. When using the root-extracting function of these controllers, the flow rate can be easily calculated from the differential pressure signal issued by the differential pressure transmitter. The analog output signal of the controller activates the positioner and with it the pneumatic valve. TROVIS 6493 TROVIS 642 PD F 8 T 6000 EN

9 Temperature control with function generation The SAMSON controllers TROVIS 642 and 6493 also allow the realization of a temperature control with function generation, e.g. an outdoor temperature-controlled flow temperature control. The outdoor temperature is measured with an Pt 00 sensor and passed on to the controller which utilizes function generation to directly convert the outdoor temperature to a set point for the flow temperature. The controller activates the electric control valve using a three-step signal. Temperature cascade control The boiler is heated by a heat exchanger. To minimize the delays of the controlled system, cascade control with a master and a slave controller is implemented. TROVIS 642 is particularly suited to solve this task since it is capable of being the master and the slave controller at the same time. It is also possible to use two TROVIS 6497 or two TROVIS 6493 controllers. The master controller measures the actual boiler temperature and forwards its manipulated variable as reference variable WE to the slave controller. The slave controller controls the flow temperature in the heat exchanger loop. The control valve is activated using a three-step signal. M x WE y x TROVIS TROVIS TROVIS 6493 Limiting control TROVIS 642 is also a good choice when performing limiting control with minimum selection, as shown in the example opposite. The color is to be heated to a certain predetermined temperature, however, the shell temperature of the reaction tank must not exceed the temperature of the color by a predetermined value. The reaction tank is heated or cooled down using two heat exchangers. The main controller controls the temperature of the color. The limiting controller controls the temperature difference between the tank shell temperature and the color temperature. The color temperature is applied to the analog output AA, fed back to the controller input as disturbance variable and subtracted from the shell temperature. The minimum selection function feeds the smaller control signal of both control loops to the split-range unit, thus activating both control valves. x y WE TROVIS 642 y AA 9 T 6000 EN

10 Explosion protection Some of the SAMSON e/p Converters are suitable for use in hazardous areas as they are frequently found in the chemical and petrochemical industry. Important factors of the explosion protection relevant for such applications are listed in the following. For details, please refer to the standards indicated. Zone classification Hazardous areas are grouped into zones to indicate the danger of explosion. Each zone prescribes particular measures which ensure explosion protection. Zone Meaning Example 0 2 Dangerous, potentially explosive atmospheres occur permanently or for a long time. Dangerous, potentially explosive atmospheres occur sometimes. Dangerous, potentially explosive atmospheres occur seldom and for a short time (< 2 h). Inside of reaction tanks containing flammable gases. In the proximity of Zone 0, immediate area around stuffing boxes that are not sufficiently sealed. Areas surrounding the Zones 0 and. Type of protection The type of protection describes the measures to be taken to prevent electrical appliances from igniting explosive atmospheres. Type of protection Basic principle Standard, regulation d Flameproof enclosure l Parts which can ignite an explosive atmosphere are placed in an enclosure which can withstand the pressure caused by an explosion inside the housing and prevents the transmission of the explosion to the surrounding explosive atmosphere. DIN EN VDE 070/07 Part 5 w Flameproof enclosures are suitable for Zones 0, and 2. i Intrinsic safety An electrical device is intrinsically safe when all circuits are intriniscally safe. A circuit is intrinsically safe when it does not R L produce sparks or thermal effects whose energy suffices to ignite an explosive atmosphere. U C DIN EN VDE 070/07 Part 7 Category ia Devices of this category are suitable for Zones 0, and 2. Zone 0 must be certified separately. Category ib Devices of this category are suitable for Zones and 2. Temperature classes The temperature classes group electrical appliances according to their max. permissible surface temperature. It must be smaller than the ignition temperature of the explosive material. Temperature class Maximum permissible surface temperature of the appliance Ignition temperature of the flammable material T 450 C > 450 C T2 300 C > C T3 200 C > C T4 35 C > C T5 00 C > C T6 85 C > C 0 T 6000 EN

11 UN 3 Ex Safety barriers according to DIN and EN Section 8 Safety barriers are passive networks which separate intrinsically safe and not intrinsically safe circuits without isolating them electrically. The output circuits of the safety barriers meet the requirements of the intrinsic safety ia and ib. Safety barriers are always installed outside the hazardous area. 2 4 /PA Circuit diagram of a safety barrier /PA IP Degree of protection The IP code characterizes an electrical appliance s protection against accidental contact and foreign particles as well as its protection against water. The code consists of two code numbers whose meanings are listed in the Table below. IP code IP 6 5 First code number (0 to 6) Prot. ag. contact and foreign particles Second code number (0 bis 8) Protection against water Code number Protection against accidental contact First code number Protection against foreign particles 0 None None None Protection against contact with the back of the hand Protection against contact with the finger Protection against contact with tools Protection against contact with a wire Protection against contact with a wire Protection against contact with a wire Protection against penetration of foreign particles >50mm Protection against penetration of foreign particles > 2.5 mm Protection against penetration of foreign particles > 2.5 mm Protection against penetration of foreign particles >.0 mm Protection against dust built-up which could impair the functioning of the device Dust-tight Protection against water Second code number Protection against water drops Protection against water drops when the device is tilted by up to 5 from the vertical position Protection against spray water hitting the device, at an angle of 60 from the vertical position Protection against spray water from all directions Protection against a water jet from all directions Protection against a strong water jet from all directions Protection against water when immersed under standardized time and pressure conditions Protection against water when permantently immersed under conditions which are agreed upon by the manufacturer and the customer. T 6000 EN

12 SAMSON AG MESS- UND REGELTECHNIK Weismüllerstraße Frankfurt am Main Germany Phone Fax Internet: T 6000 EN