Burkert 8792 Operating Instructions Manual
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Burkert 8792 Operating Instructions Manual

Burkert 8792 Operating Instructions Manual

Electropneumatic positioner and process controller
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Type 8792, 8793
Electropneumatic positioner and process controller
Operating Instructions

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  • Page 1 Type 8792, 8793 Electropneumatic positioner and process controller Operating Instructions...
  • Page 2 We reserve the right to make technical changes without notice. Technische Änderungen vorbehalten. Sous resérve de modification techniques. © Bürkert Werke GmbH & Co. KG, 2009 - 2022 Operating Instructions 2208/08_EN-en_00806089 / Original DE...

  • Page 3: Table Of Contents

    5.1.1 Features ..........................18 5.1.2 Combination with valve types and mounting versions ...........19 5.1.3 Overview of the mounting options ..................20 5.2 Designs ............................21 5.2.1 Type 8792, positioner .....................21 5.2.2 Type 8793, process controller ..................21 5.2.3 Type 8793, Remote-Design ....................21 STRUCTURE ............................22 6.1 Representation ...........................22...
  • Page 4 Type 8792, 8793 Type 8792, 8793 PROCESS CONTROLLER TYPE 8793 ....................28 8.1 Schematic representation of process control ................29 8.2 The process controller software ....................30 INTERFACES OF THE POSITIONER / PROCESS CONTROLLER ............32 TECHNICAL DATA ..........................33 10.1 Conformity ..........................33 10.2 Standards ...........................33 10.3 Approval .............................33 10.4 Operating conditions .........................33 10.5 Type label ...........................34...
  • Page 5 Type 8792, 8793 Type 8792, 8793 ELECTRICAL CONNECTION - CIRCULAR PLUG-IN CONNECTOR ...........53 14.1 Type 8792 - designation of the circular plug-in connectors ............53 14.2 Connection of the positioner Type 8792 ...................54 14.2.1 X1 - M12, 8-pole circular connector ................54 14.2.2 X4 - M8, 4-pole socket (for binary outputs option only) Output signals to the control centre (e.g. PLC) ............54 14.3 Type 8793 - designation of the circular plug-in connectors and contacts ......55...
  • Page 6 Type 8792, 8793 Type 8792, 8793 MANUALLY OPENING AND CLOSING THE VALVE ................73 START-UP .............................74 BASIC SETTING OF THE DEVICE......................75 22.1 INPUT - Setting the input signal ....................76 22.2 X.TUNE – Automatic adjustment of the positioner ..............77 22.2.1 X.TUNE.CONFIG – Manual configuration of X.TUNE ..........79 ACTIVATION OF THE PROCESS CONTROLLER ................80 BASIC SETTING OF THE PROCESS CONTROLLER ................81...
  • Page 7 Type 8792, 8793 Type 8792, 8793 25.2 Overview and description of the auxiliary functions ..............102 25.2.1 CHARACT – Select the transfer characteristic between input signal (position set- point value) and stroke ...................103 25.2.2 CUTOFF – Sealing function ..................107 25.2.3 DIR.CMD – Sense of effective direction of the positioner set-point value ....109 25.2.4...
  • Page 8 27.9.2 Configuration of the process values ..............194 27.10 Configuration with Siemens Step7 ..................197 27.10.1 Example 1 of a positioner (Type 8792): Transfer of set-point and actual value ..197 27.10.2 Example 2 of a process controller (Type 8793): Transfer of several process values ................198 MAINTENANCE ..........................199 ERROR MESSAGES AND MALFUNCTIONS ..................199...
  • Page 9 Type 8792, 8793 Type 8792, 8793 PROPERTIES OF PID CONTROLLERS .....................206 34.1 P-portion ...........................206 34.2 I-portion ............................207 34.3 D-portion ..........................208 34.4 Superposition of P, I and D Portions ..................209 34.5 Implemented PID controller .....................210 34.5.2 Function of the real PID controller ................210 ADJUSTMENT RULES FOR PID CONTROLLERS ................211 35.1 Adjustment rules according to Ziegler and Nichols (oscillation method)......211...
  • Page 10 Type 8792, 8793 Type 8792, 8793 english...

  • Page 11: Operating Instructions

    → designates a procedure that must be carried out. Definition of the term “device” In these instructions, the term “device” always refers to the Type 8792/8793 english...

  • Page 12: Authorized Use

    ▶ Correct transportation, correct storage and installation and careful use and maintenance are essential for reliable and faultless operation. ▶ Use the Type 8792 and 8793 only as intended. Restrictions If exporting the system/device, observe any existing restrictions.

  • Page 13: Basic Safety Instructions

    Type 8792, 8793 Type 8792, 8793 Basic safety instructions BASIC SAFETY INSTRUCTIONS These safety instructions do not consider any contingencies or incidents which occur during installation, operation and maintenance. The operator is responsible for observing the location-specific safety regulations, also with reference to the personnel.
  • Page 14 Type 8792, 8793 Basic safety instructions The Type 8792/8793 were developed with due consideration given to the accepted safety rules and are state-of-the-art. Nevertheless, dangerous situations may occur. Failure to observe this operating manual and its operating instructions as well as unauthorized tampering with the device release us from any liability and also invalidate the warranty covering the devices and accessories.

  • Page 15: General Information

    And also on the internet at: www.burkert.com Warranty The warranty is only valid if the Type 8792/8793 are used as intended in accordance with the specified appli- cation conditions. Master code Operation of the device can be locked via a freely selectable user code. In addition, there is a non-changeable master code with which you can perform all operator actions on the device.

  • Page 16: Description Of System

    Description of system DESCRIPTION OF SYSTEM General description The positioner Type 8792 / process controller Type 8793 is a digital, electro-pneumatic positioner for pneu- matically actuated continuous valves. The device incorporates the main function groups - Position sensor - Electro-pneumatic control system - Microprocessor electronics The position sensor measures the current positions of the continuous valve.

  • Page 17: Combination With Valve Types And Mounting Versions

    Type 8792/8793 is mounted directly on the actuator or attached to the side. Device version Remote: An extern position sensor (linear or rotative) via a digital interface. The Type 8792/8793 is attached to a wall either with a DIN rail or with a mounting bracket (remote design). english...

  • Page 18: Overview Of The Mounting Options

    Type 8792, 8793 Type 8792, 8793 Description of system 5.1.3 Overview of the mounting options Mounting NAMUR on rotary actuator Mounting NAMUR with mounting bracket on a linear actuator Remote mounting with mounting bracket Remote mounting with DIN rail Table 1:...

  • Page 19: Designs

    Type 8792, 8793 Type 8792, 8793 Description of system Designs 5.2.1 Type 8792, positioner The position of the actuator is regulated according to the position set-point value. The position set-point value is specified by an external standard signal (or via field bus).

  • Page 20: Structure

    Structure STRUCTURE The positioner Type 8792 and process controller Type 8793 consist of the micro-processor controlled elec- tronics, the position sensor and the control system. The device is designed using three-wire technology. Operation is controlled by four keys and a 128x64 dot matrix graphics display.

  • Page 21: Function Diagram

    6.2.1 Diagram illustrating single-acting actuator The black lines in “Fig. 2” specify the function of the positioner circuit in Type 8792. The grey part of the diagram indicates the additional function of the superimposed process control circuit in Type 8793.

  • Page 22: Positioner Type 8792

    0. Z1 represents a disturbance variable. Valve opening Position set- Positioner Control system Continuous point value Solenoid valve valves Position sensor Position control circuit Fig. 3: Position control circuit in Type 8792 english...

  • Page 23: Schematic Representation Of The Position Control

    Type 8792, 8793 Type 8792, 8793 Positioner Type 8792 Schematic representation of the position control Fig. 4: Schematic representation of position control english...

  • Page 24: Positioner Software

    Type 8792, 8793 Type 8792, 8793 Positioner Type 8792 Positioner software Configurable auxiliary functions Effect Correction line to adjust the operating Selection of the transfer characteristic between characteristic input signal and stroke (correction characteristic) CHARACT Sealing function Valve closes tight outside the control range. Speci-...
  • Page 25 Type 8792, 8793 Type 8792, 8793 Positioner Type 8792 Configurable auxiliary functions Effect Serial interface Configuration of serial interface SER.I/O Setting display Adjustment of the display of the process level EXTRAS SERVICE For internal use only POS.SENSOR Setting interface remote position sensor (available for Type 8793 Remote only.

  • Page 26: Process Controller Type 8793

    Type 8792, 8793 Type 8792, 8793 Process controller Type 8793 PROCESS CONTROLLER TYPE 8793 In the case of process controller Type 8793 the position control mentioned in chapter “7” becomes the subor- dinate auxiliary control circuit; this results in a cascade control. The process controller in the main control circuit of Type 8793 has a PID function.

  • Page 27: Schematic Representation Of Process Control

    Type 8792, 8793 Type 8792, 8793 Process controller Type 8793 Schematic representation of process control Fig. 6: Schematic representation of process control english...

  • Page 28: The Process Controller Software

    Type 8792, 8793 Type 8792, 8793 Process controller Type 8793 The process controller software Configurable auxiliary functions Effect Correction line to adjust the operating Selection of the transfer characteristic between characteristic input signal and stroke (correction characteristic) CHARACT Sealing function Valve closes tight outside the control range. Specification...
  • Page 29 Type 8792, 8793 Type 8792, 8793 Process controller Type 8793 Configurable auxiliary functions Effect SERVICE For internal use only Simulation software For simulation of the device functions SIMULATION DIAGNOSE (Option) Monitoring of processes POS.SENSOR Setting interface remote position sensor (available for Type 8793 Remote only. See chapter “5.2.3 Typ 8793, Remote-Design”.

  • Page 30: Interfaces Of The Positioner / Process Controller

    Optional inputs and outputs are illustrated by dotted lines Fig. 7: Interfaces of the positioner / process controller The Types 8792 and 8793 are 3-wire devices, i.e. the power (24 V DC) is supplied separately from the set-point value signal. * only for process controller Type 8793...

  • Page 31: Technical Data

    TECHNICAL DATA 10.1 Conformity In accordance with the Declaration of conformity, Type 8792 / 8793 is compliant with the EC Directives. 10.2 Standards The applied standards which are used to demonstrate compliance with the EC Directives are listed in the EC-Type Examination Certificate and/or the EC Declaration of Conformity.

  • Page 32: Type Label

    Explanation of the device-specific specifications on the type label: Example: Operating voltage Nominal power Device variant Type (NAMUR/Remote, 24 V DC/ PROFIBUS DP) 8792 24V DC 5W Supply pressure, Degree of NAMUR Profibus DP protection P=1.4…7bar IP65/67 Ambient temperature range Tamb -10..+60°C CE Marking Approval mark CSA (for...

  • Page 33: Electrical Data

    Type 8792, 8793 Type 8792, 8793 Technical data 10.7 Electrical data Connections 2 cable glands (M20 x 1.5) with screw-type terminals 0.14 – 1.5 mm or circular plug-in connector Operating voltage 24 V DC ± 10% max. residual ripple 10% Power consumption <...

  • Page 34: Pneumatic Data

    Type 8792, 8793 Type 8792, 8793 Technical data 10.8 Pneumatic data Control medium Neutral gases, air Quality classes in accordance with DIN ISO 8573-1 Dust content Class 7, max. particle size 40 µm, max. particle density 10 mg/m³ Water content Class 3, max.

  • Page 35: Safety End Positions After Failure Of The Electrical Or Pneumatic Auxiliary Power

    Type 8792, 8793 Type 8792, 8793 Technical data 10.9 Safety end positions after failure of the electrical or pneumatic auxiliary power The safety end position depends on the pneumatic connection of the actuator to the working connections A1 or A2.

  • Page 36: Factory Settings

    227 093 Information at Communicator www.burkert.com Table 10: Accessories Other accessories can be found on the data sheet for Type 8792/8793. www.burkert.com 11.1 Communications software The PC operating program “Communicator” is designed for communication with the devices from the Bürkert positioner family.

  • Page 37: Attachment And Assembly

    Type 8792, 8793 Type 8792, 8793 Attachment and assembly ATTACHMENT AND ASSEMBLY The dimensions of the Type 8792/8793 and the different device versions can be found on the data sheet. 12.1 Safety instructions WARNING! Risk of injury from improper installation. ▶ Installation may be carried out by authorised technicians only and with the appropriate tools.

  • Page 38: Attachment To A Continuous Valve With Linear Actuators According To Namur

    Type 8792, 8793 Type 8792, 8793 Attachment and assembly 12.2 Attachment to a continuous valve with linear actuators according to NAMUR The valve position is transferred to the position sensor installed in the positioner via a lever (according to NAMUR).

  • Page 39: Installation

    Type 8792, 8793 Type 8792, 8793 Attachment and assembly 12.2.2 Installation WARNING! Risk of injury from improper installation. ▶ Installation may be carried out by authorised technicians only and with the appropriate tools. Risk of injury from unintentional activation of the system and an uncontrolled restart. ▶ Secure system from unintentional activation. ▶ Following assembly, ensure a controlled restart.
  • Page 40 Minimal: 30° Maximal: 150° The rotational movement of the lever must be within the position sensor angular range of 150°. Fig. 14: Angular range of the lever → Attach lever to the shaft of the Type 8792/8793 and screw tight. english...

  • Page 41: Attaching Mounting Bracket

    ⑪ washers (see “Fig. 15”). The selection of the M8 thread used on the Type 8792/8793 depends on the size of the actuator. → To determine the correct position, hold the Type 8792/8793 with mounting bracket on the actuator. ⑤...

  • Page 42: Aligning Lever Mechanism

    Move the actuator in manual mode to half stroke (according to the scale on the actuator). → Adjust the height of the Type 8792/8793 until the lever is horizontal. → Fix the Type 8792/8793 in this position on the actuator.

  • Page 43: Attachment To A Continuous Valve With Rotary Actuator

    - parallel to the actuator or - rotated by 90° to the actuator. → Determine home position and direction of rotation of the actuator. → Connect adapter to the shaft of the Type 8792/8793 and secure with 2 setscrews. english...
  • Page 44 One of the setscrews must be situated on the flat side of the shaft as an anti-twist safeguard (see “Fig. 18”). Rotational range of the position sensor: The maximum rotaional range of the position sensor is 150°. The shaft of the Type 8792/8793 may be moved within this range only. 150° Maximum rotational range Rotational range of the positioner = 90°...
  • Page 45 If the X.TUNE ERROR 5 message is indicated on the graphics display after the X.TUNE function starts, the shaft of the Type 8792/8793 is not correctly aligned with the shaft of the actuator (see “Table 112: Error and warning message on X.TUNE”, page 200.

  • Page 46: Remote Operation With External Position Sensor

    12.4.1 Mounting accessories There are two options of attaching the Type 8792/8793 in remote operation (see “Fig. 21”). Installation on a DIN rail with accessory kit, Installation on a wall with accessory kit, part no.

  • Page 47: Connection And Start-Up Of The Remote Sensor Type 8798

    ▶ Following assembly, ensure a controlled restart. → Connect the 3 or 4 wires of the sensor cable to the designated screw-type terminals of type 8792/8793. Connection of screw-type terminals: See chapter “15.2.4 Terminal assignment for external position sensor (for remote model only)”, page 59.

  • Page 48: Connection And Start-Up Via A 4 - 20 Ma Position Sensor (For Type 8793 Remote Model Only)

    Type 8792, 8793 Type 8792, 8793 Attachment and assembly 12.4.3 Connection and start-up via a 4 – 20 mA position sensor (for Type 8793 remote model only) When a 4 – 20 mA position sensor is connected, the process controller Type 8793 can be used as a positioner only, as the process actual value input is used as input for the position sensor.

  • Page 49: Pneumatic Connection

    Type 8792, 8793 Type 8792, 8793 Pneumatic connection PNEUMATIC CONNECTION 13.1 Safety instructions DANGER! Risk of injury from high pressure in the equipment. ▶ Before loosening the pneumatic lines and valves, turn off the pressure and vent the pneumatic lines. WARNING! Risk of injury from improper installation. ▶ Installation may be carried out by authorized technicians only and with the appropriate tools.
  • Page 50 Type 8792, 8793 Type 8792, 8793 Pneumatic connection Procedure: → Apply supply pressure (1.4 – 7 bar) to the supply pressure connection P. For single-acting actuators (control function A and B): → Connect one working connection (A1 or A2, depending on required safety position) to the chamber of the single-acting actuator.

  • Page 51: Electrical Connection - Circular Plug-In Connector

    ▶ Following installation, ensure a controlled restart. Using the 4 – 20 mA set-point value input If several devices of Type 8792/8793 are connected in series and the power supply to a device in this series connection fails, the input of the failed device becomes highly resistive. As a result, the 4 – 20 mA standard signal fails.

  • Page 52: Connection Of The Positioner Type 8792

    Type 8792, 8793 Type 8792, 8793 Electrical connection - circular plug-in connector 14.2 Connection of the positioner Type 8792 → Connect pins according to the model (options) of the positioner. 14.2.1 X1 - M12, 8-pole circular connector Wire Configuration On the device side External circuit / Signal level colour* Input signals of the control centre (e.g. PLC)

  • Page 53: Type 8793 - Designation Of The Circular Plug-In Connectors And Contacts

    Type 8792, 8793 Type 8792, 8793 Electrical connection - circular plug-in connector 14.3 Type 8793 - designation of the circular plug-in connectors and contacts Operating voltage Binary outputs Process actual value and diverse signals X1 - M12, 8-pole X5 - M8, 4-pole...

  • Page 54: Connecting The Process Controller Type 8793

    Electrical connection - circular plug-in connector 14.4 Connecting the process controller Type 8793 → First connect the process controller as described in chapter “14.2 Connection of the positioner Type 8792”. 14.4.1 X5 - M8, 4-pole circular connector, plug assignments of the process actual value input...

  • Page 55: Electrical Connection - Cable Gland

    ▶ Following installation, ensure a controlled restart. Using the 4 – 20 mA set-point value input If several devices of Type 8792/8793 are connected in series and the power supply to a device in this series connection fails, the input of the failed device becomes highly resistive. As a result, the 4 – 20 mA standard signal fails.

  • Page 56: Terminal Assignment For Cable Gland - Positioner Type 8792

    Connect Type 8792/8793. The procedure is described in the following chapters. for Type 8792: chapter “15.2 Terminal assignment for cable gland - positioner Type 8792” for Type 8793: chapter “15.3 Terminal assignment for cable gland - process controller Type 8793”...

  • Page 57: Operating Voltage

    Type 8792, 8793 Type 8792, 8793 Electrical connection - cable gland 15.2.3 Operating voltage Terminal Configuration On the device side External circuit / Signal level +24 V Operating voltage + +24 V 24 V DC ± 10% max. residual ripple 10% Operating voltage GND Table 19: Terminal configuration; operating voltage 15.2.4...

  • Page 58: Terminal Assignment For Cable Gland - Process Controller Type 8793

    Type 8792, 8793 Type 8792, 8793 Electrical connection - cable gland 15.3 Terminal assignment for cable gland - process controller Type 8793 → First connect the process controller as described in chapter “15.2 Terminal assignment for cable gland - positioner Type 8792”...

  • Page 59: Operating Levels

    Type 8792, 8793 Type 8792, 8793 Operating levels OPERATING LEVELS There is the process level and the setting level for the operation and setting of type 8792/8793. Process level: The running process is displayed and operated on the process level. Operating state: AUTOMATIC –...

  • Page 60: Operating And Display Elements

    Type 8792, 8793 Operating and display elements OPERATING AND DISPLAY ELEMENTS The following chapter describes the operating and display elements of Type 8792/8793. 17.1 Description of the operating and display elements The device is operated by four keys and a 128x64 dot matrix graphics display.

  • Page 61: Description Of The Symbols Which Are Displayed On The Process Level

    Type 8792, 8793 Type 8792, 8793 Operating and display elements Display elements of the setting level: Menu designation Submenu Operating elements: Designation for the Right selection key function of the keys Arrow key , down arrow Arrow key , up arrow Left selection key Fig. 29: Display and operating elements of the setting level 17.1.1...

  • Page 62: Function Of The Keys

    Type 8792, 8793 Type 8792, 8793 Operating and display elements 17.2 Function of the keys The functions of the 4 operating keys differ depending on the operating state (AUTOMATIC or MANUAL) and operating level (process level or setting level). The key function which is active is displayed in the gray text field which is above the key.

  • Page 63: Entering And Changing Numerical Values

    Type 8792, 8793 Type 8792, 8793 Operating and display elements 17.2.1 Entering and changing numerical values Changing numerical values with fixed decimal places: Description of the function Example function Change to the next decimal place (from right to Arrow key left). After reaching the last decimal place, the display switches back to the first decimal place.

  • Page 64: Adjusting The Display

    • The menu options which can be displayed depend on the type. How you can adjust the display for Type 8792 individually to the process to be controlled is described in Chapter “26.2.18 EXTRAS – Setting the display”..
  • Page 65 Type 8792, 8793 Type 8792, 8793 Operating and display elements Possible displays in AUTOMATIC operating state Graphical display of POS and CMD with time axis MENU CMD / POS (t) HOLD Time, weekday and date CLOCK 12:00 Thu. 01 . 0 9 . 1 1 MENU INPUT X.TUNE...

  • Page 66: Date And Time

    Type 8792, 8793 Type 8792, 8793 Operating and display elements 17.4 Date and time Date and time are set on the process level in the CLOCK menu. To ensure that the input menu for CLOCK can be selected on the process level, the following functions must be activated in 2 stages: 1.

  • Page 67: Setting Date And Time

    Type 8792, 8793 Type 8792, 8793 Operating and display elements 17.4.1 Setting date and time → On the process level select the display for CLOCK using the arrow keys. → Press INPUT to open the input screen for the setting.

  • Page 68: Operating States

    Type 8792, 8793 Type 8792, 8793 Operating states OPERATING STATES Type 8792/8793 has 2 operating states: AUTOMATIC and MANUAL. When the operating voltage is switched on, the device is in the AUTOMATIC operating state. AUTOMATIC In the AUTOMATIC operating state normal controlled operation is implemented.

  • Page 69: Activating And Deactivating Auxiliary Functions

    Type 8792, 8793 Type 8792, 8793 Activating and deactivating auxiliary functions ACTIVATING AND DEACTIVATING AUXILIARY FUNCTIONS Auxiliary functions can be activated for demanding control tasks. The auxiliary function is activated via the ADD.FUNCTION basic function and transferred to the main menu (MAIN).

  • Page 70: Deactivating Auxiliary Functions

    Type 8792, 8793 Type 8792, 8793 Activating and deactivating auxiliary functions Principle: Activating auxiliary functions with simultaneous incorporation into the main menu Functions in the main menu (Standard) Setting level INPUT M A I N INPUT X.TUNE X.TUNE ADD.FUNCTION Activating the auxiliary function EXIT ENTER ADD.FUNCTION ENTER CHARACT EXTRAS DIAGNOSE EXIT...

  • Page 71: Manually Opening And Closing The Valve

    Type 8792, 8793 Type 8792, 8793 Manually opening and closing the valve MANUALLY OPENING AND CLOSING THE VALVE In the MANUAL operating state, the valve can be opened and closed manually using the arrow keys. The MANUAL operating state (key function...

  • Page 72: Start-Up

    Start-up START-UP Before start-up, carry out fluid and electrical installation of Type 8792/8793 and of the valve. For description see Chapter “13”, “14” and “15”. When the operating voltage is applied, Type 8792/8793 is operating and is in the AUTOMATIC operating state.

  • Page 73: Basic Setting Of The Device

    Type 8792, 8793 Type 8792, 8793 Basic setting of the device BASIC SETTING OF THE DEVICE The following settings must be made for the basic setting of Type 8792/8793: INPUT Selection of the input signal (see Chapter “23.1”). X.TUNE Automatic self-parameterization of the positioner (see Chapter “23.2”)

  • Page 74: Input - Setting The Input Signal

    Type 8792, 8793 Type 8792, 8793 Basic setting of the device 22.1 INPUT - Setting the input signal This setting is used to select the input signal for the set-point value. Procedure: Action Description Switching from process level setting level.

  • Page 75: X.tune - Automatic Adjustment Of The Positioner

    Type 8792, 8793 Type 8792, 8793 Basic setting of the device 22.2 X.TUNE – Automatic adjustment of the positioner WARNING! Danger due to the valve position changing when the X.TUNE function is run. When the X.TUNE function is run under operating pressure, there is an acute risk of injury. ▶ Never run X.TUNE while the process is running.
  • Page 76 Type 8792, 8793 Type 8792, 8793 Basic setting of the device Operating structure: Process level (values are displayed) Press for approx. 3 s MENU Setting level INPUT Automatic self-parameterization X.TUNE X.TUNE STARTED Hold down as long as countdown TUNE #0 (5 ...) is...

  • Page 77: X.tune.config - Manual Configuration Of X.tune

    Type 8792, 8793 Type 8792, 8793 Basic setting of the device X.TUNE Control system aeration side leaking Not possible, device defective ERROR 4 X.TUNE The rotational range of the position Correct attachment of the position ERROR 5 sensor is exceeded by 150°...

  • Page 78: Activation Of The Process Controller

    Type 8792, 8793 Type 8792, 8793 Activation of the process controller ACTIVATION OF THE PROCESS CONTROLLER The process controller is activated by selecting the P.CONTROL auxiliary function in the ADD.FUNCTION menu. The activation transfers P.CONTROL into the main menu (MAIN) where it is available for further settings.

  • Page 79: Basic Setting Of The Process Controller

    Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller BASIC SETTING OF THE PROCESS CONTROLLER 24.1 P.CONTROL – Setting up and parameterization of the process controller To start up the process controller, you must make the following settings in the P.CONTROL menu:...
  • Page 80 Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller Procedure: Action Description Switching from process level setting level. MENU Press for approx. 3 s Select P.CONTROL Selection in the main menu (MAIN). The submenu options for basic settings can now be selected.

  • Page 81: Setup - Setting Up The Process Controller

    Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller 24.2 SETUP – Setting up the process controller These functions specify the type of control. The procedure is described in the following Chapters “25.2.1” to “25.2.5”. 24.2.1 PV-INPUT – Specifying signal type for the process actual value One of the following signal types can be selected for the process actual value: •...

  • Page 82: Pv-Scale - Scaling Of The Process Actual Value

    Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller 24.2.2 PV-SCALE – Scaling of the process actual value The following settings are specified in the submenu of PV-SCALE: 1. The physical unit of the process actual value.
  • Page 83 Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller 24.2.2.1. Effects and dependencies of the settings of PV-INPUT on PV-SCALE The settings in the PV-SCALE menu have different effects, depending on the signal type selected in PV-INPUT.
  • Page 84 Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller For internal set-point value default (SP-INPUT → intern), the process set-point value is input directly on the process level. Example of a sensor calibration for frequency signal type:...
  • Page 85 Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller Action Description 3. Setting K-factor (only available for frequency signal type) Select K-factor The submenu for the setting of the K-factor is displayed. ENTER Press either Select VALUE Manual input of the K-factor. The input screen is opened. The decimal point has a dark...

  • Page 86: Sp-Input - Type Of The Set-Point Value Default (Intern Or Extern)

    Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller 24.2.3 SP-INPUT – Type of the set-point value default (intern or extern) The SP-INPUT menu specifies how the default of the process set-point value is to be implemented.
  • Page 87 Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller Operating structure: SP-SCALE ENTER SPmin INPUT Input lower process set-point value INPUT SPmax Input upper process set-point EXIT value Fig. 40: Operating structure SP-SCALE Scaling process set-point value SETUP → SP-SCALE: Action...

  • Page 88: P.co-Init - Smooth Switchover Manual-Automatic

    Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller 24.2.5 P.CO-INIT – Smooth switchover MANUAL-AUTOMATIC The smooth switchover between the MANUAL and AUTOMATIC states can be activated or deactivated in the P.CO-INIT menu. Factory default setting: bumpless Smooth switchover activated.

  • Page 89: Pid.parameter - Parameterizing The Process Controller

    Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller 24.3 PID.PARAMETER – Parameterizing the process controller The following control parameters of the process controller are manually set in this menu. DBND 1.0 % Insensitivity range (dead band) of the process controller 1.00...

  • Page 90: Dbnd - Insensitivity Range (Dead Band)

    DBND – Insensitivity range (dead band) This function causes the process controller to respond from a specific control difference only. This protects both the solenoid valves in Type 8792/8793 and the pneumatic actuator. Factory setting: 1.0 % with reference to the range of the scaled process actual value (setting in the menu PV-SCALE →...

  • Page 91: Tn - Reset Time Of The Process Controller

    Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller 24.3.4 TN – Reset time of the process controller The reset time specifies the I-contribution of the PID controller (can be set with the aid of the P.TUNE function).

  • Page 92: Filter - Filtering Of The Process Actual Value Input

    Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller 24.3.7 FILTER – Filtering of the process actual value input The filter is valid for all process actual value types and has a low pass behavior (PT1). Factory setting: 0 Operating structure: PID.PARAMETER...

  • Page 93: P.q'lin - Linearization Of The Process Characteristic

    Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller 24.4 P.Q‘LIN – Linearization of the process characteristic This function automatically linearizes the process characteristic. In doing so, the nodes for the correction characteristic are automatically determined. To do this, the program moves through the valve stroke in 20 steps and measures the associated process variable.

  • Page 94: P.tune - Self-Optimization Of The Process Controller

    Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller 24.5 P.TUNE – Self-optimization of the process controller This function can be used to automatically parameterize the PID controller integrated in the process controller. In doing so, the parameters for the P, I and D-contribution of the PID controller are automatically determined and transferred to the corresponding menus of (KP, TN, TV).
  • Page 95 Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller 24.5.2.1. Preparatory measures for execution of P.TUNE in the MANUAL operating state Moving process actual value PV to the operating point: Action Description Setting on the process level: Select PV The process actual value PV is indicated on the display.

  • Page 96: Starting The Function

    Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller To observe PV, it is recommended to select via the arrow keys the graphical display SP/PV(t). To be able to select the display SP/PV(t), it must be activated in the EXTRAS menu (see Chapter “26.2.18 EXTRAS –...
  • Page 97 Type 8792, 8793 Type 8792, 8793 Basic setting of the process controller Possible error messages when running P.TUNE: Display Cause of fault Remedial action TUNE Manual termination of self-optimization err/break by pressing the EXIT key. P.TUNE No supply pressure connected. Connect supply pressure. ERROR 1 No change to process variable.

  • Page 98: Configuring The Auxiliary Functions

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions CONFIGURING THE AUXILIARY FUNCTIONS The device has auxiliary functions for demanding control tasks. This chapter describes how the auxiliary functions are activated, set and configured. 25.1 Activating and deactivating auxiliary functions The required auxiliary functions must be activated by the user initially by incorporation into the main menu (MAIN).

  • Page 99: Removing Auxiliary Functions From The Main Menu

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.1.2 Removing auxiliary functions from the main menu If a function is removed from the main menu, the settings implemented previously under this function become invalid again. Procedure: Action Description Switching from process level setting level.

  • Page 100: Overview And Description Of The Auxiliary Functions

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2 Overview and description of the auxiliary functions Selection of the transfer characteristic between input ADD.FUNCTION CHARACT ENTER signal and stroke (correction characteristic) Sealing function for positioner CUTOFF Sense of effective direction between input signal and set- DIR.CMD...

  • Page 101: Charact - Select The Transfer Characteristic Between Input Signal (Position Set-Point Value) And Stroke

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.1 CHARACT – Select the transfer characteristic between input signal (position set-point value) and stroke Characteristic (customer-specific characteristic) Use this auxiliary function to select a transfer characteristic with reference to set-point value (nominal position, CMD) and valve stroke (POS) for correction of the flow-rate or operating characteristic.
  • Page 102 For this reason it is occasionally necessary to correct the course of the operating characteristic in a suitable way. For this purpose the Type 8792/8793 features a transfer element which implements different characteristics. These are used to correct the operating characteristic.
  • Page 103 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions Procedure: Action Description Switching from process level setting level. MENU Press for approx. 3 s Select CHARACT (To do this, the auxiliary function must be incorporated into the main menu).
  • Page 104 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions Example of a programmed characteristic Valve stroke [%] (POS) Standard signal [%] (CMD) 90 100 4...20 mA 0...20 mA 0...10 V 0...5 V Fig. 54: Example of a programmed characteristic In the section “Tables for customer-specific settings” in chapter “39.1 Settings of the freely program- mable characteristic”...

  • Page 105: Cutoff - Sealing Function

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.2 CUTOFF – Sealing function This function causes the valve to be sealed outside the control area. This is where you input the limits for the position set-point value (CMD) as a percentage, from which the actuator is fully deaerated or aerated.
  • Page 106 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions Valve stroke [%] Adjustable from 75...100 % (POS) Set-point value [%] (CMD) einstellbar von 0...25 % Fig. 56: Graph - CUTOFF; english...

  • Page 107: Dir.cmd - Sense Of Effective Direction Of The Positioner Set-Point Value

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.3 DIR.CMD – Sense of effective direction of the positioner set- point value Use this auxiliary function to set the sense of effective direction between the input signal (INPUT) and the nominal position (CMD) of the actuator.

  • Page 108: Dir.act - Sense Of Effective Direction Of The Actuator Drive

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.4 DIR.ACT – Sense of effective direction of the actuator drive Use this auxiliary function to set the sense of effective direction between the aeration state of the actuator and the actual position (POS).

  • Page 109: Spltrng - Signal Split Range

    Type 8793: The SPLTRNG auxiliary function can only be selected when operating as a positioner. P.CONTROL = not activated. Use this auxiliary function to limit the position set-point value range of the Type 8792/8793 by specifying a minimum and a maximum value.

  • Page 110: X.limit - Limits The Mechanical Stroke Range

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.6 X.LIMIT – Limits the mechanical stroke range This auxiliary function limits the (physical) stroke to specified % values (minimum and maximum). In doing so, the stroke range of the limited stroke is set equal to 100 %.

  • Page 111: X.time - Limiting The Control Speed

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.7 X.TIME – Limiting the control speed Use this auxiliary function to specify the opening and closing times for the entire stroke and limit the control speeds. When the X.TUNE function is running, the minimum opening and closing time for the entire stroke is automatically entered for Open and Close.

  • Page 112: X.control - Parameterization Of The Positioner

    (see Auxiliary function “26.2.6 X.LIMIT – Limits the mechanical stroke range” ). This function causes the controller to respond only from a specific control difference; as a result the solenoid valves in the Type 8792/8793 and the pneumatic actuator are protected. english...

  • Page 113: P.control - Setting Up And Parameterization Of The Process Controller

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions Xd1‘ Position set- Control to the point value difference controller Xd1‘ Dead zone Position actual value Fig. 68: Graph - X.CONTROL 25.2.9 P.CONTROL – Setting up and parameterization of the process controller Parameterization of the process controller is described in Chapter “25.1 P.CONTROL –...

  • Page 114: 25.2.10 Security - Code Protection For The Settings

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.10 SECURITY – Code protection for the settings Use the SECURITY function to prevent the Type 8792/8793 or individual functions from being accessed unintentionally. Factory setting: Access Code: 0000 If the code protection is activated, the code (set access code or master code) must be input whenever operator action is disabled.
  • Page 115 * If you have forgotten the set code: All operator actions can be implemented with the non-changeable master code. This 4-digit master code can be found in the printed brief instructions for Type 8792/8793. english...

  • Page 116: 25.2.11 Safepos - Input The Safety Position

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.11 SAFEPOS – Input the safety position This function specifies the actuator safety position which is started at defined signals. The set safety position is only started • if there is a corresponding signal on the binary input (Configuration see chapter “26.2.13 BINARY.IN –...

  • Page 117: 25.2.12 Sig.error - Configuration Of Signal Level Fault Detection

    Fault if input signal 225 °C (± 0.5 % of final value, hysteresis 0.5 % of final value) The signal type is set in the following menus: 1. INPUT (for Types 8792 and 8793): See Chapter “23.1 INPUT - Setting the input signal”.

  • Page 118: 25.2.13 Binary.in - Activation Of The Binary Input

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.12.1. Behavior of the actuator when safety position deactivated or activated Selection SafePos off – The actuator remains in the position which corresponds to the set-point value last transferred (default setting).
  • Page 119 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions SafePos – Approaching a safety position: The behavior of the actuator depends on the activation of the SAFEPOS auxiliary function. See Chapter “26.2.11 SAFEPOS – Input the safety position”. SAFEPOS activated: The actuator moves to the safety position which is specified in the SAFEPOS aux- iliary function.

  • Page 120: Output - Configuring The Outputs (Option)

    OUT ANALOG - Configuring the analogue output 25.2.14.1. Type 8792: The feedback of the current position (POS) or of the set-point value (CMD) can be transmitted to the control center via the analog output. Type 8793: The feedback of the current position (POS) or of the set-point value (CMD), of the process actual value (PV) or of the process set-point value (SP) can be transmitted to the control center via the analog output.
  • Page 121 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.14.2. OUT BIN1 / OUT BIN2 - Configuring the binary outputs The following description is valid for both binary outputs OUT BIN 1 and OUT BIN 2, as the operation in the menu is identical.
  • Page 122 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions Alarm output for exceeding the permitted control deviation OUT BIN1 Tolerance for the POS.Dev ENTER SELEC Input value OUT BIN2 permitted control Deviation: deviation Adjustment range: 1...50 %** Output: current position with respect to a specified...
  • Page 123 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.14.3. Setting of the submenu options of OUT BIN 1 / OUT BIN 2 Action Description Switching from process level setting level. MENU Press for approx. 3 s Select OUTPUT (To do this, the auxiliary function must be incorporated into the main menu).
  • Page 124 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions • Safepos - Outputting the message: Actuator in safety position • ERR.SP/CMD - Outputting the message: Sensor break for process set-point value/set-point position Only available if the function in the SIG.ERR menu has been activated (SIG.ERR → SP/CMD input → Error on). See Chapter “26.2.12 SIG.ERROR – Configuration of signal level fault detection”.
  • Page 125 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions • OUT.type - Setting the switching status In addition to selecting the output, the switching status required for the binary output must be input. See “Table 64”. Action Description Select OUT.type The switching statuses normally open and normally closed are...

  • Page 126: 25.2.15 Cal.user - Calibration Of Actual Value And Set-Point Value

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.15 CAL.USER – Calibration of actual value and set-point value The following values can be manually calibrated with this function: • Position actual value calibr. POS (0 - 100 %) calibr.
  • Page 127 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions CAL.USER ENTER calibr. POS POS. pMIN ENTER INPUT Input value (POS.lower:) POS. pMAX INPUT EXIT Input value (POS.upper:) Only for positioner Type 8792 (or for Type 8793 if P.CONTROL not activated). calibr. INP INP 4mA 0**...
  • Page 128 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.15.1. Calibration of the position actual value and the position set-point value Action Description Switching from process level setting level. MENU Press for approx. 3 s Select CAL.USER (To do this, the auxiliary function must be incorporated into the main menu).
  • Page 129 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.15.2. Calibration of the process set-point value and process actual value Action Description Switching from process level setting level. MENU Press for approx. 3 s Select CAL.USER (To do this, the auxiliary function must be incorporated into the main menu).
  • Page 130 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions Action Description Switching from setting level process level. EXIT Press Table 66: CAL.USER; calibration of position actual value and position set-point value 25.2.15.3. Resetting the settings under CAL.USER to the factory settings...

  • Page 131: 25.2.16 Set.factory - Resetting To The Factory Settings

    (until progress bar is closed) Reset is implemented. Switching from setting level process level. EXIT Press Table 68: SET.FACTORY; Resetting to the factory settings To adjust the Type 8792/8793 to the operating parameters, re-implement self-parameterization of the positioner (X.TUNE). english...

  • Page 132: 25.2.17 Ser. I\O - Settings Of The Serial Interface

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.17 SER. I\O – Settings of the serial interface This function can be used to set the type of the serial interface and the baud rate. SELEC SER. I/O I/O.MODE...

  • Page 133: 25.2.18 Extras - Setting The Display

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.18 EXTRAS – Setting the display This function can be used to individually set the display. • In DISP.ITEMS the display of the process level can be individually set. To do this, further menu options can be activated for the display of the process level. POS and CMD are activated in the as-delivered state.
  • Page 134 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions DISP.ITEMS - Activating menu displays for displaying the process level: Action Description Switching from process level setting level. MENU Press for approx. 3 s Select ADD.FUNCTION The possible auxiliary functions are displayed. ENTER Press Select EXTRAS ENTER Press Activate the EXTRAS auxiliary function by checking the box and transfer into the main menu.
  • Page 135 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions DISP.MODE - S elect type of display (black font on light background or white font on dark background): Action Description Switching from process level setting level. MENU Press for approx. 3 s Select ADD.FUNCTION The possible auxiliary functions are displayed. ENTER Press Select EXTRAS...

  • Page 136: Pos.sensor - Setting Interface Remote Position Sensor

    If the position sensor requires an additional power supply of 24 V DC, it can be supplied via the positioner. 25.2.20 SERVICE This function is of no importance to the operator of Type 8792/8793. It is for internal use only. english...

  • Page 137: Simulation - Menu For Simulation Of Set-Point Value, Process And Process Valve

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions SIMULATION – Menu for simulation of set-point value, process 25.2.21 and process valve This function can be used to simulate set-point value, process and process valve independently of each other.
  • Page 138 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions SIGNAL.sim – Simulation of the set-point value 25.2.21.1. The settings to simulate the set-point value are made in the SIGNAL.sim menu. In the SIGNAL.form submenu by selecting one of the following waveforms...
  • Page 139 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions Action Description The submenu for setting the simulation is displayed. ENTER Press Select SIGNAL.sim The submenu for activating and parameterizing the set-point ENTER Press value simulation is displayed. Select SIGNAL.form...
  • Page 140 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions CONTROL.sim – Simulation of the process and process valve 25.2.21.2. The settings to simulate the process and the process valve are made in the CONTROL.sim menu. Settings Type of simulation: Simulation of the process valve.
  • Page 141 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions Action Description Select required simulation Selection x.SIM = simulation process. Selection p.SIM = simulation process valve. SELEC Press Activate the selection by checking the box or deactivate it by unchecking the box Setting the parameters for simulation of the process and/or the process valve: Select SIM.Gain...

  • Page 142: Diagnose - Menu For Monitoring Valves (Option)

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions DIAGNOSE – Menu for monitoring valves (option) 25.2.22 The optional function DIAGNOSE can be used to monitor the state of the valve. If there are deviations from the set-point state, messages are output according to NE 107.
  • Page 143 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.22.3. DIAGNOSE – Operating structure Display all generated Select a diagnosis diagnosis messages message DIAGNOSE D. MSG ENTER SERVICE.TIME ENTER ENTER CLEAR Diagnosis Delete message message POS.MONITOR EXIT displayed EXIT...
  • Page 144 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.22.4. Activation of diagnosis functions In the ADD.DIAGNOSE menu several diagnosis functions are activated and incorporated into the DIAGNOSE main menu. Activatable diagnosis functions: Graphical display of the dwell time density and movement range.
  • Page 145 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.22.5. Description of the DIAGNOSE main menu D.MSG – Diagnosis messages All generated diagnosis messages are listed in the D.MSG menu where they can be viewed and deleted. The status signal, which is assigned to the diagnosis message, is indicated by a symbol.
  • Page 146 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions If several diagnosis messages are available with different status signals, the status signal with the highest priority is shown on the display. Overview of the status signals according to NE 107 (NE = NAMUR recommendation): Priority Status signal Description Failure Function check Out of specification...
  • Page 147 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions ADD.DIAGNOSE – Activation and deactivation of diagnosis functions Diagnosis functions can be activated in this menu and incorporated into the DIAGNOSE main menu or already activated diagnosis functions can be deactivated again. Activation of diagnosis functions: For description see Chapter “26.2.22.4. Activation of diagnosis functions”...
  • Page 148 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.22.6. Description of the diagnosis functions HISTOGRAM – Output of histograms The HISTOGRAM menu is divided into 2 parts: 1. O utputting the histograms for POS class (dwell time density) and DIR class (movement range) 2.
  • Page 149 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions POS-Class - Description of the histogram of the dwell time density The histogram indicates how long the actuator has stopped in a specific position. For this purpose the stroke range is divided into 10 classes. The current position of one of the 10 classes is assigned to each scan time.
  • Page 150 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions DIR-Class - Description of the histogram of the movement range The histogram indicates the movement ranges of the actuator between two direction reversal points. For this purpose the movement range between two changes in direction is divided into 10 classes.
  • Page 151 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions Starting, stopping and deleting the histograms Action Description Select HISTOGRAM (To do this, the HISTOGRAM function must be incorporated into the DIAGNOSE main menu. See Chapter “26.2.22.4. Activation of diagnosis functions”). The empty matrix of the POS-Class submenu (dwell time...
  • Page 152 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions SERVICE.TIME – Operating-hours counter The operating-hours counter records the time during which the device was switched on. If the duty cycle reaches the specified time limit, a message is generated. • To do this, a history entry is made in the HISTORY submenu. For description see “26.2.22.7. History entries in the HISTORY submenu”.
  • Page 153 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions TRAVEL.ACCU – Path accumulator The path accumulator records and adds up the path which the actuator piston covers. A movement of the actuator piston is detected when the position changes by at least 1 %.
  • Page 154 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions Specifying interval for the output of messages Action Description Select TRAVEL.ACCU (To do this, the TRAVEL.ACCU function must be incorporated into the DIAGNOSE main menu. See Chapter “26.2.22.4. Acti- vation of diagnosis functions”). The menu is displayed.
  • Page 155 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions Operating structure: INPUT CYCLE.COUNTER ENTER LIMIT Input change in direction Display the remaining changes in direction until the NEXT M. next message Delete history entry ENTER HISTORY CLEAR EXIT History entry is displayed EXIT Fig.
  • Page 156 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions Display TEMP.CHECK Description of the functions CURRENT indicates the current temperature. TEMP.CHECK MAX indicates the highest temperature of the slave pointer 21.7 * C CURRENT 21.7 * C MIN indicates the lowest temperature of the slave pointer 21.7 * C...
  • Page 157 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions Action Description Input upper temperature limit TEMP.MAX. Increase value < Changing the decimal place Acknowledge value. Press Select TEMP.MIN Open factory setting for lower temperature limit. INPUT Press Input lower temperature limit TEMP.MIN.
  • Page 158 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions CAUTION! If a stroke limit was set in the X.LIMIT menu, the mechanical end position monitor has only limited relevance. The end positions indicated on the process level under POS are not the physically caused end positions in this case.
  • Page 159 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions Action Description Acknowledge value. Press Return to the STROKE.CHECK menu. EXIT Press Return to the DIAGNOSE main menu. EXIT Press Table 93: STROKE.CHECK; end position monitor. POS.MONITOR –Position monitoring The POS.MONITOR function monitors the current position of the actuator.
  • Page 160 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions Operating structure: ENTER DEADBAND POS.MONITOR INPUT Input tolerance band COMP.TIME INPUT Input compensation time Delete history entry ENTER HISTORY CLEAR EXIT History entry is displayed EXIT Fig. 98: Operating structure POS.MONITOR Inputting tolerance band and compensation time...
  • Page 161 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.2.22.7. History entries in the HISTORY submenu Each diagnosis function, which can output a message, has the HISTORY submenu. When the diagnosis message is actuated, a history entry is created with date and value. The history entries of the respective diagnosis function can be viewed and deleted in the HISTORY submenu.

  • Page 162: Manual Configuration Of X.tune

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.3 Manual configuration of X.TUNE This function is needed for special requirements only. For standard applications the X.TUNE function has been preset at the factory. See chapter “23.2 X.TUNE – Automatic adjustment of the positioner”. For special requirements the X.TUNE function, as described below, can be manually configured.

  • Page 163: Description Of The Menu For The Manual Configuration Of X.tune

    Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.3.1 Description of the menu for the manual configuration of X.TUNE Configuration of the X.TUNE Specify which functions are to be executed when X.TUNE.CONFIG function X.TUNE is running (automatic self-optimization). - Specify whether the pneumatic actuator has Position of the end positions M.TUNE.POS...
  • Page 164 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions X.TUNE.POS – Setting of the end positions 25.3.1.2. In this menu you can specify whether the pneumatic actuator has mechanical end positions or not. If there are no mechanical end positions available, these are not approached by the X.TUNE and must be manually specified.
  • Page 165 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions 25.3.1.3. M.TUNE.PWM – Optimization of the PWM signals In this menu the PWM signals for control of the aeration valves and bleed valves are manually optimized. For optimization the actuator is aerated and bled. A progress bar on the display indicates the position of the actuator and the speed of aeration and deaeration.
  • Page 166 Type 8792, 8793 Type 8792, 8793 Configuring the auxiliary functions M.TUNE.AIR – Determination of the opening and closing times 25.3.1.4. By running this function, the opening and closing times of the valve are determined continuously. A change to the supply pressure will affect the aeration time which can be optimized in this way.

  • Page 167: Operating Structure And Factory Settings

    Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings OPERATING STRUCTURE AND FACTORY SETTINGS The factory presets are highlighted in blue to the right of the menu in the operating structure. Examples: Menu options activated or selected at the factory Menu options not activated or selected at the factory sec, ...
  • Page 168 Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings BUS PDO / Setpoint Operation mode Error reset P.CONTRL active Automatic X.TUNE X.TUNE X.TUNE STARTED TUNE #0 INIT ... X.TUNE ready Manual X.TUNE X.TUNE.CONFIG X.TUNE.DBDx X.TUNE.PARAx X.TUNE.LEAKAGE X.TUNE.Ypwm X.TUNE.Yfric M.TUNE.POS ACT.limit ACT.nolimit...
  • Page 169 Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings ADD.FUNCTION CHARACT CUTOFF DIR.CMD DIR.ACT SPLTRNG X.LIMIT X.TIME X.CONTROL P.CONTROL SECURITY SAFEPOS SIG.ERROR BINARY.IN OUTPUT CAL.USER SET.FACTORY SER.I/O EXTRAS POS.SENSOR SERVICE SIMULATION DIAGNOSE Activatable auxiliary functions CHARACT Fig. 102: Operating structure - 3...
  • Page 170 Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings Activatable auxiliary functions CHARACT linear GP 1:25 GP 1:3 3 GP 1:5 0 GP 25:1 GP 3 3:1 GP 5 0:1 Graph FREE GRAPH y 0 –> y 5 –> •...
  • Page 171 Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings Activatable auxiliary functions X.LIMIT 100 % 100 % 1.0 sec X.TIME T . open 1.0 sec 1.0 sec T . close 1.0 sec 1.0 % X.CONTROL DBND 1.0 % KXopn KXcls...
  • Page 172 Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings Activatable auxiliary functions 0.0 l/s PV-SCALE PVmin 100.0 l/s PVmax 100.0 VALUE K-Factor TEACH-IN Valve TEACH-IN closing Teach-in at work –> filling VOLUME SP-INPUT intern extern 0.0 l/s SP-SCALE SPmin 100.0 l/s SPmax 100.0...
  • Page 173 Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings Activatable auxiliary functions SAFEPOS Safepos SIG.ERROR SP/CMD Input Error off Error on SAFEPOS SafePos off SafePos on PV Input Error off Error on SAFEPOS SafePos off SafePos on BINARY.IN SafePos Manu / Auto X.TUNE...
  • Page 174 Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings 1,0 % OUT BIN 1 POS.Dev Deviation 1.0 % POS.Lim-1 Limit 0.0 % Safepos ERR.SP/CMD ERR.PV Remote Tune.Status DIAG.State-1 FAILURE OUT SPEC FUNC.CHECK MAINTENANCE OUT.type normally open normally closed...
  • Page 175 Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings Activatable auxiliary functions CAL.USER calibr. POS POS.pMIN * Value is set for X.TUNE (automatic or manual). POS.pMAX calibr. INP INP 4mA ** Value is set by the manufacturer during device-specific calibration.
  • Page 176 Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings Activatable auxiliary functions SERIAL.CONFIG NONE par.,1 Stop EVEN par.,1 Stop ODD par.,1 Stop NONE par., 2 Stop EVEN par., 2 Stop ODD par., 2 Stop EXTRAS DISP.ITEMS CMD/POS CMD/POS ( t)
  • Page 177 Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings Activatable auxiliary functions START-UP.ITEMS CMD/POS CMD/POS ( t) SP/PV SP/PV ( t) CLOCK INPUT TEMP X.TUNE P.TUNE P.LIN DISP.MODE normal invers POS.SENSOR DIGITAL ANALOG tan.corr off TAN.CORRECTION tan.corr SERVICE 0° ALPHA +/- 0°...
  • Page 178 Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings Activatable auxiliary functions SIMULATION SIGNAL.sim SIGNAL.form Extern Sinus Square Triangle Mixed 50.0 % Offset 80.0 % Amplitude 5.0 sec Periode CONTROL.sim x.SIM p.SIM SIM.Gain 2.0 sec SIM.Delay DIAGNOSE D.MSG SERVICE.TIME TRAVEL.ACCU CYCLE.COUNTER...
  • Page 179 Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings TRAVEL.ACCU FAILURE FUNC.CHECK OUT.SPEC MAINTENANCE CYCLE.COUNTER FAILURE FUNC.CHECK OUT.SPEC MAINTENANCE TEMP.CHECK FAILURE FUNC.CHECK OUT.SPEC MAINTENANCE STROKE.CHECK FAILURE FUNC.CHECK OUT.SPEC MAINTENANCE PV.MONITOR FAILURE FUNC.CHECK OUT.SPEC MAINTENANCE POS.MONITOR FAILURE FUNC.CHECK OUT.SPEC MAINTENANCE ADD.DIAGNOSE...
  • Page 180 Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings ADD.DIAGNOSE HISTOGRAM SERVICE.TIME TRAVEL.ACCU CYCLE.COUNTER TEMP.CHECK STROKE.CHECK PV.MONITOR POS.MONITOR RESET.HISTORY Reset done Aktivierbare Diagnosefunktionen HISTOGRAM POS-Class DIR-Class SYSTEM-DATA 90d. 00h SERVICE.TIME LIMIT NEXT M. HISTORY 20.0 mm TRAVEL.ACCU 1000000 cm LIMIT NEXT.M...
  • Page 181 Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings Activatable auxiliary functions TEMP.CHECK CURRENT 60.0 °C LIMIT TEMP.MAX 0.0 °C TEMP.MIN HISTORY TEMP.MAX TEMP.MIN STROKE.CHECK 0,5 % LIMIT LIMIT ZERO.TOL 0,5 % MAX.TOL HISTORY ZERO 2.0 % POS.MONITOR DEADBAND 10.0 sec COMP.TIME...

  • Page 182: Profibus Dp

    Sync and Freeze mode Are not supported Diagnosis telegram No device-specific diagnosis Parameter telegram No user parameters The process data is configured in the Type 8792/8793 and in the PROFIBUS master. Maximum 10 process values (total INPUT and OUTPUT) can be transferred. 27.2 Interfaces Input for process...

  • Page 183: Changing The Operating State

    27.4 Safety settings if the bus fails The position is approached which corresponds to the set-point value last transferred (default setting). Other setting options (see chapter “30.3 BUS.COMM – Settings on Type 8792/8793”. 27.5 Bus status display The bus status is indicated on the display on the device.

  • Page 184: Electrical Connections

    Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings 27.7 Electrical connections DANGER! Risk of injury due to electrical shock. ▶ Before reaching into the device or the equipment, switch off the operating voltage and secure to prevent reactivation. ▶ Observe applicable accident prevention and safety regulations for electrical equipment.

  • Page 185: Connection Diagram Type 8792

    X2 - M12, 5-pole socket * circular connector * Functional earth FE * (inversely coded, PROFIBUS DP) Fig. 116: Connection PROFIBUS DP, positioner Typ 8792 27.7.2 Connection diagram Type 8793 X1 - M12, 8-pole X5 - M8, 4-pole circular connector...

  • Page 186: X1 - M12, 8-Pole Circular Connector

    Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings 27.7.3 X1 - M12, 8-pole circular connector On the device Configuration External circuit / Signal level side not used not used Operating voltage 24 V DC ± 10% max. residual ripple 10% +24 V Input signals of the control centre (e.g. PLC) 0 – 5 V (log.

  • Page 187: X4 - M8, 4-Pole Socket, Optional - Remote Sensor (For Remote Model Only)

    Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings 27.7.5 X4 - M8, 4-pole socket, optional - Remote Sensor (for remote model only) Connection of the digital, contact-free position sensor Type 8798: On the device Configuration External circuit side Supply sensor + Remote Sensor Supply sensor –...

  • Page 188: X5 - M8, 4-Pole Circular Connector - Process Actual Value (Type 8793 Only)

    Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings 27.7.6 X5 - M8, 4-pole circular connector - process actual value (Type 8793 only) Wire On the Input type* Pin Configuration External circuit colour ** switches*** device side 4 – 20 mA brown +24 V transmitter supply...

  • Page 189: Start-Up Profibus Dp

    Before start-up, carry out fluid installation (see Chapter “13”) and electrical installation (Chapter “29”) of Type 8792/8793 and of the valve. 27.8.2 Start-up sequence For start-up of Type 8792/8793 PROFIBUS DP the following basic settings are required: Device type Sequence Type of basic setting Setting via...

  • Page 190: Bus.comm - Settings On Type 8792/8793

    Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings BUS.COMM – Settings on Type 8792/8793 27.8.3 Set the following menu options in the BUS.COMM menu for start-up of the PROFIBUS DP: Enter a device address (value between 0 and 126) Address 0...
  • Page 191 Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings Input device address. BUS.COMM ENTER Address INPUT Enter Adjustment range: 0...126 value SELEC Activating / SafePos off BUS FAIL ENTER deactivating approach of the SafePos on EXIT safety position...

  • Page 192: Configuration Via The Control (Profibus Dp Master)

    More detailed information can be found in the supplementary instructions on the Bürkert homepage: • „Configuration on the PROFIBUS by means of GSD file“ www.burkert.com → Type 8792 or Type 8793 → Config. PROFIBUS by GSD-file 27.9.2 Configuration of the process values →...
  • Page 193 Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings Name Description Identifier PDI:MODE Operating state (operation mode) GSD file: PDI:MODE Operating state: AUTO MANU XTUNE P.QLIN 10: P.TUNE 12: BUSSAFEPOS Identifier (HEX): 41, 00, 05 PDI:ERR Error GSD file: PDI:ERR Indicates the number of the process value (output) which was not written.
  • Page 194 Type 8792, 8793 Type 8792, 8793 Operating structure and factory settings → Then the PDO (Process Data Output) input. PDO: Process Data Output (from the controller to the Type 8792/8793) Name Description Identifier PDO:CMD/ for positioner Type 8792: Set-point position (input) GSD file: PDO:CMD/SP Set-point value of positioner as ‰.

  • Page 195: 27.10 Configuration With Siemens Step7

    Fig. 119: ScreenShot PROFIBUS → Pull the slave Type 8792 / 8793 onto the bus line with drag-and-drop. Fig. 120: ScreenShot positioner → Pull the modules PDI:POS and PDO:CMD/SP into the slave Type 8792 / 8793 with drag-and-drop. english...

  • Page 196: Example 2 Of A Process Controller (Type 8793): Transfer Of Several Process Values

    Transfer of several process values Fig. 121: ScreenShot PROFIBUS → Pull the slave Type 8792 / 8793 onto the bus line with drag-and-drop. Fig. 122: ScreenShot process controller → Pull the modules into the slave Type 8792 / 8793 with drag-and-drop.

  • Page 197: Maintenance

    Type 8792, 8793 Type 8792, 8793 Maintenance MAINTENANCE The Type 8792/8793 is maintenance-free when operated according to the instructions in this manual. ERROR MESSAGES AND MALFUNCTIONS 29.1 Error messages on the display 29.1.1 General error messages Display Causes of error Remedial action Minimum input value has been Do not reduce value further reached Maximum input value has been...

  • Page 198: Error And Warning Messages While The X.tune Function Is Running

    Type 8792, 8793 Type 8792, 8793 Maintenance 29.1.2 Error and warning messages while the X.TUNE function is running Display Causes of error Remedial action TUNE Manual termination of self-parameter- err/break ization by pressing the EXIT X.TUNE locked The X.TUNE function is blocked Input access code X.TUNE...

  • Page 199: Error Messages While The P.q'lin Function Is Running

    Type 8792, 8793 Type 8792, 8793 Maintenance 29.1.3 Error messages while the P.Q’LIN function is running Display Cause of fault Remedial action Q.LIN Manual termination of linearization by err/break pressing the key. EXIT P.Q‘LIN No supply pressure connected. Connect supply pressure.

  • Page 200: Error Messages On Field Bus Devices

    Type 8792, 8793 Type 8792, 8793 Maintenance 29.1.5 Error Messages on Field Bus Devices Display Causes of error Remedial action MFI fault Field bus board defective. Not possible, device defective. Table 115: Error Messages on Field Bus Devices On PROFIBUS: Display Device status Explanation Troubleshooting •...

  • Page 201: Packaging And Transport

    Type 8792, 8793 Type 8792, 8793 Packaging and transport PACKAGING AND TRANSPORT NOTE! Transport damages. Inadequately protected equipment may be damaged during transport. ▶ During transportation protect the device against wet and dirt in shock-resistant packaging. ▶ Avoid exceeding or dropping below the allowable storage temperature.

  • Page 202: Selection Criteria For Continuous Valves

    Type 8792, 8793 Type 8792, 8793 Selection criteria for continuous valves SELECTION CRITERIA FOR CONTINUOUS VALVES The following criteria are crucial for optimum control behavior and to ensure that the required maximum flow is reached: • the correct selection of the flow coefficient which is defined primarily by the orifice of the valve;...
  • Page 203 Type 8792, 8793 Type 8792, 8793 Selection criteria for continuous valves − ² ² Vges The k value of the continuous valve should have at least the value which is calculated according to equation (1) or (2) which is appropriate to the application, however it should never be far above the calculated value.

  • Page 204: Properties Of Pid Controllers

    Type 8792, 8793 Type 8792, 8793 Properties of PID Controllers PROPERTIES OF PID CONTROLLERS A PID controller has a proportional, an integral and a differential portion (P, I and D portion). 34.1 P-portion Function: Kp is the proportional coefficient (proportional gain). It is the ratio of the adjusting range ∆Y to the proportional range ∆Xd.

  • Page 205: I-Portion

    Type 8792, 8793 Type 8792, 8793 Properties of PID Controllers 34.2 I-portion Function: ∫ Ti is the integral action time or actuating time. It is the time which passes until the actuating variable has run through the whole adjustment range.

  • Page 206: D-Portion

    Type 8792, 8793 Type 8792, 8793 Properties of PID Controllers 34.3 D-portion Function: ⋅ Kd is the derivative action coefficient. The larger Kd is, the greater the D-effect is. Characteristic and step response of the D-portion of a PID controller Step response Ramp response Fig. 125: Characteristic and step response of the D portion of a PID controller...

  • Page 207: Superposition Of P, I And D Portions

    Type 8792, 8793 Type 8792, 8793 Properties of PID Controllers 34.4 Superposition of P, I and D Portions Function: ∫ ⋅ Where Kp · Ti = Tn and Kd/Kp = Tv the function of the PID controller is calculated according to the fol- lowing equation: ∫...

  • Page 208: Implemented Pid Controller

    Type 8792, 8793 Type 8792, 8793 Properties of PID Controllers 34.5 Implemented PID controller 34.5.1 D Portion with delay In the process controller Type 8793 the D portion is implemented with a delay T. Function: ⋅ ⋅ Superposition of P, I and DT Portions Fig. 127: Characteristic of superposition of P, I and DT Portions 34.5.2...

  • Page 209: Adjustment Rules For Pid Controllers

    Type 8792, 8793 Type 8792, 8793 Adjustment rules for PID Controllers ADJUSTMENT RULES FOR PID CONTROLLERS The control system Type 8793 features a self-optimization function for the structure and parameters of the integrated process controller. The determined PID parameters can be seen via the operating menu and re- optimized at will for an empirical path.
  • Page 210 Type 8792, 8793 Type 8792, 8793 Adjustment rules for PID Controllers The controller parameters can then be calculated from K and T according to the following table. krit krit Adjustment of the parameters according to Ziegler and Nichols Controller type Adjustment of the parameters P controller Kp = 0.5 K...

  • Page 211: Adjustment Rules According To Chien, Hrones And Reswick (Actuating Variable Jump Method)

    Type 8792, 8793 Type 8792, 8793 Adjustment rules for PID Controllers 35.2 Adjustment rules according to Chien, Hrones and Reswick (actuating variable jump method) With this method the controller parameters are adjusted on the basis of the transient behavior of the controlled system.
  • Page 212 Type 8792, 8793 Type 8792, 8793 Adjustment rules for PID Controllers Adjustment of the parameters according to Chien, Hrones and Reswick Adjustment of the parameters Controller type for aperiodic control process for control process (0% overshoot) with 20% overshoot Reference Malfunction Reference Malfunction Kp = P controller Kp = 0,3 ·...

  • Page 213: Settings Of The Freely Programmable Characteristic

    Type 8792, 8793 Type 8792, 8793 Table for your settings on the positioner TABLE FOR YOUR SETTINGS ON THE POSITIONER 36.1 Settings of the freely programmable characteristic Node (position Valve stroke [%] set-point Date: Date: Date: Date: value as %)

  • Page 214: Set Parameters Of The Process Controller

    Type 8792, 8793 TABLE FOR YOUR SETTINGS ON THE PROCESS CONTROLLER TYPE 8793 37.1 Set parameters of the process controller Date: Date: Date: Date: DBND PVmin PVmax SPmin SPmax UNIT K factor FILTER english...
  • Page 215 www.burkert.com...

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