Burkert 8694 Operating Instructions Manual
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Burkert 8694 Operating Instructions Manual

Positioner top control basic
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Type 8694 REV.2
Positioner Top Control Basic
Electropneumatic position controller
Operating Instructions

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  • Page 1 Type 8694 REV.2 Positioner Top Control Basic Electropneumatic position controller Operating Instructions...
  • Page 2 We reserve the right to make technical changes without notice. Technische Änderungen vorbehalten. Sous réserve de modifications techniques. © Bürkert Werke GmbH & Co. KG, 2018 - 2021 Operating Instructions 2102/03_EN-EN_00815304 / Original DE...

  • Page 3: Table Of Contents

    Features ........................15 5.4.3 Function diagram of the positioner with single-acting actuator .........16 5.5 Type 8694 positioner (position controller) .................17 5.5.1 Schematic representation of the position control Type 8694 ........17 5.5.2 Functions of the position controller software .............18 5.6 Interfaces of the positioner ......................20 TECHNICAL DATA ..........................21 6.1 Conformity ..........................21...
  • Page 4 Type 8694 REV.2 6.5 Mechanical data .........................21 6.6 Pneumatic data ..........................22 6.7 Type labels ..........................22 6.7.1 Type label ........................22 6.7.2 UL additional label ......................22 6.8 Electrical data ..........................23 6.8.1 Electrical data, without fieldbus communication ............23 6.8.2 Electrical data, IO-Link ....................24 6.8.3 Electrical data, büS .....................24 6.9 Factory settings of the positioner .....................25 CONTROL AND DISPLAY ELEMENTS ....................26...
  • Page 5 Type 8694 REV.2 ELECTRICAL INSTALLATION 24 V DC ....................50 10.1 Safety instructions ........................50 10.2 Electrical installation with circular plug-in connector ..............50 10.2.1 Designation of the contacts Type 8694 ..............50 10.2.2 Connection of the positioner Type 8694 ..............51 10.3 Electrical installation with cable gland ..................53 ELECTRICAL INSTALLATION, IO-LINK ....................56 ELECTRICAL INSTALLATION, BÜS .....................57 START-UP .............................58 13.1 Safety instructions ........................58 13.2 Specifying the standard settings ....................58 13.2.1...
  • Page 6 Type 8694 REV.2 16.1.5 RESET - Reset to factory settings .....................70 16.1.6 X.TUNE - Automatic calibration of the position controller ............70 16.2 Auxiliary functions ........................71 16.2.1 DIR.ACT - Reversal of the effective direction of the actuator ............72 16.2.2 SPLTRNG - Signal split range ......................73 16.2.3 X.LIMIT - Stroke limit ........................74...

  • Page 7: About These Instructions

    Type 8694 REV.2 About these instructions ABOUT THESE INSTRUCTIONS The operating instructions describe the entire life cycle of the device. → Keep these instructions ready to hand at the operation site. Important safety information. ▶ Carefully read these instructions. ▶ Observe in particular the safety instructions, intended use and operating conditions.

  • Page 8: Definition Of Terms

    Type 8694 REV.2 About these instructions Definition of terms In these instructions the term “device” denotes the following device types: Positioner Type 8694 REV.2 The term “büS” (Bürkert system bus) used in this instruction stands for the communication bus developed by Bürkert and based on the CANopen protocol. In these instructions, the abbreviation “Ex” always refers to “potentially explosive atmosphere”. Firmware changes As of firmware Changes version A.1.6 Display of “valve position half-way“ changed from “LED off“ to “LED is lit white english...

  • Page 9: Intended Use

    Type 8694 REV.2 Intended use INTENDED USE The Positoner Type 8694 REV.2 is designed to be mounted on pneumatic actuators of process valves for the control of media. The permitted fluid media are listed in the technical data. ▶ Use the device for its intended purpose only. Non-intended use of the device may be dangerous to peo- ple, nearby equipment and the environment. ▶ Correct transportation, correct storage as well as correct installation, commissioning, operation and maintenance are essential for reliable and problem-free operation.

  • Page 10: Basic Safety Instructions

    Type 8694 REV.2 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. DANGER Risk of injury from high pressure and discharge of medium. ▶ Before working on the device or system, switch off the pressure. Vent or drain lines. DANGER Risk of injury from electric shock. ▶ Before working on the device or system, switch off the power supply. Secure against reactivation. ▶ Observe applicable accident prevention and safety regulations for electrical equipment.

  • Page 11: General Information

    Brands and trademarks listed below are trademarks of the corresponding companies / associations / organizations Loctite Henkel Loctite Deutschland GmbH Information on the internet The operating instructions and data sheets for Type 8694 can be found on the Internet at: www.burkert.com english...

  • Page 12: System Description

    Type 8694 REV.2 System description SYSTEM DESCRIPTION Intended application area The positioner Type 8694 is designed to be mounted on pneumatic actuators of process valves for the control of media. Function of the positioner and combination with valve types Positioner Type 8694 is an electropneumatic position controller for pneumatically actuated control valves with single-acting actuators.

  • Page 13: Features Of The Valve Types

    Type 8694 REV.2 System description 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. Pneumatically actuated piston actuators and rotary actuators can be used as an actuator. Single-acting actuators are offered in combination with the positioner. For single-acting actuators, only one chamber is aerated and deaerated in the actuator. The generated pressure works against a spring.

  • Page 14: Structure Of The Positioner

    System description Structure of the positioner The positioner Type 8694 consists of the micro-processor controlled electronics, the position sensor and the pilot valve system. The positioner is operated via 2 buttons and a 4-pole DIP switch. The pilot valve system for single-acting actuators consists of 2 solenoid valves.

  • Page 15: Features

    Type 8694 REV.2 System description 5.4.2 Features • Models for single-acting valve actuators. • Position sensor Contactless and therefore wear-free position sensor. • Microprocessor-controlled electronics for signal processing, control and valve control. • Control module The device is controlled via 2 buttons and a 4-pole DIP switch.

  • Page 16: Function Diagram Of The Positioner With Single-Acting Actuator

    Type 8694 REV.2 System description 5.4.3 Function diagram of the positioner with single-acting actuator The illustrated function diagram describes the function of the positioner (Type 8694). external position set-point value Position controller Actual Positioner Pilot valve system position Pilot valve...

  • Page 17: Type 8694 Positioner (Position Controller)

    Position control Position sensor circuit Figure 4: Signal flow plan of position controller 5.5.1 Schematic representation of the position control Type 8694 büS, IO-Link 4 – 20 mA DIR.ACT X.LIMIT 0 – 20 mA X.CONTROL CMD* DBND SPLTRNG DIR.CMD...

  • Page 18: Functions Of The Position Controller Software

    Type 8694 REV.2 System description 5.5.2 Functions of the position controller software Basic functions • Activation via DIP switches • Parameter setting via communications software Function Effect Valve closes tight outside the control range. Specifi- cation of the value (as %), from which the actuator is Sealing function...
  • Page 19 Type 8694 REV.2 System description Auxiliary functions • Activation and parameter setting with communications software Function Effect Reversal of the effective direction of the actuator Assignment of the aeration status of the actuator chamber to the actual position. DIR.ACT Signal split range Standard signal as % for which the valve runs through the entire mechanical stroke range.

  • Page 20: Interfaces Of The Positioner

    Type 8694 REV.2 System description Interfaces of the positioner Input for position Analog set-point value position feedback 4 – 20 mA (variant) Positioner 0 – 20 mA 3- or 4-wire Digital input 24 V DC Communications Operation interface 5) Or via fieldbus communication (büS/CANopen or IO-Link) 6) Factory setting is 4 –...

  • Page 21: Technical Data

    Type 8694 REV.2 Technical data TECHNICAL DATA Conformity In accordance with the EU Declaration of conformity, the positioner Type 8694 is compliant with the EU Directives. Standards The applied standards on the basis of which compliance with the EU Directives is confirmed are listed in the EU type examination certificate and/or the EU Declaration of Conformity. Licenses The product is approved for use in zone 2 and 22 in accordance with ATEX directive 2014/34/EU category 3GD.

  • Page 22: Pneumatic Data

    Type 8694 REV.2 Technical data Pneumatic data Control medium neutral gases, air Quality classes in accordance with ISO 8573-1 Dust content Quality class 7 max. particle size 40 µm, max. particle density 10 mg/m³ Water content Quality class 3 max. pressure dew point -20 °C or min.

  • Page 23: Electrical Data

    Type 8694 REV.2 Technical data Electrical data WARNING! Only circuits with limited power may be used for UL approved components according to “NEC Class 2”. 6.8.1 Electrical data, without fieldbus communication Protection class III as per DIN EN 61140 (VDE 0140-1) Connections Cable gland M16 x 1.5, wrench size 22 (clamping area 5 – 10 mm) with screw-type terminals for cable cross-sections 0.14 –...

  • Page 24: Electrical Data, Io-Link

    Type 8694 REV.2 Technical data 6.8.2 Electrical data, IO-Link Protection class III as per DIN EN 61140 (VDE 0140-1) Connection Circular plug-in connector M12 x 1, 5-pin, A-coded, Port Class B Operating voltage System supply (Pin 1+3) 24 V DC ±25 % (according to specification) Actuator supply (Pin 2+5) 24 V DC ±25 % (according to specification)

  • Page 25: Factory Settings Of The Positioner

    Type 8694 REV.2 Technical data Factory settings of the positioner Functions can be activated via DIP switches: Function Parameter Value CUTOFF Sealing function below Sealing function above 98 % CHARACT Characteristic correction FREE DIR.CMD Reversal of the effective direction set- point value Table 5: Factory settings...

  • Page 26: Control And Display Elements

    Type 8694 REV.2 Control and display elements CONTROL AND DISPLAY ELEMENTS The following chapter describes the operating statuses as well as the control and display elements of the positioner. Further information on the operation of the positioner can be found in the chapter entitled “13 Start-up”.
  • Page 27 Type 8694 REV.2 Control and display elements Transparent cap Body casing Basic housing Actuator Figure 10: Open positioner Body casing Seal body casing Basic housing Figure 11: Position of the seal in the body casing ATTENTION! Damage or malfunction due to penetration of dirt and humidity. ▶ To observe degree of protection IP65 / IP67, screw the transparent cap in all the way.

  • Page 28: Configuration Of The Buttons

    Type 8694 REV.2 Control and display elements Configuration of the buttons To operate the DIP switches and buttons, make sure that the local control lock is deactivated/ unlocked (factory setting): with communication software or fieldbus communication. The configuration of the 2 buttons varies depending on the operating state (AUTOMATIC / MANUAL). The description of the operating states (AUTOMATIC / MANUAL) can be found in the chapter entitled “7.1 Operating state”. Button 1 Button 2 Figure 12: Description of the buttons ATTENTION! Breakage of the pneumatic connection pieces due to rotational impact.
  • Page 29 Type 8694 REV.2 Control and display elements AUTOMATIC operating state (DIP switch 4 set to OFF): Button Function Start the X.TUNE function: press button for 5 seconds until LED 2 (green) flashes Longer than 10 s (< 30 s, LED 2 flashes at 5 Hz): Device restart 1 and 2 simultane- ously Longer than 30 s (LED 2 flashes at 10 Hz): Reset device to factory setting Table 8: Configuration of the buttons for AUTOMATIC operating state Body casing...

  • Page 30: Function Of The Dip Switches

    Type 8694 REV.2 Control and display elements Function of the DIP switches To operate the DIP switches and buttons, make sure that the local control lock is deactivated/ unlocked (factory setting): with communication software or fieldbus communication. 1 2 3 4 ATTENTION! Breakage of the pneumatic connection pieces due to rotational impact. ▶ When unscrewing and screwing in the body casing or transparent cap, do not hold the actuator of the process valve but the basic housing.
  • Page 31 Type 8694 REV.2 Control and display elements Information about the communications software: The switching position of the DIP switch has priority over the settings via the communications software. If the values of the sealing function (CUTOFF) or the correction characteristic (CHARACT) are changed via the communications software, the corresponding function must be active (DIP switches set to ON). The effective direction of the set-point value (DIR.CMD) can be changed via the DIP switches only. If the correction characteristic (CHARACT) is not changed via the communications software, a linear characteristic is saved when DIP switch 3 is set to ON. A detailed description of the functions can be found in the chapter entitled “Basic functions”. Body casing Seal body casing Basic housing Figure 16: Position of the seal in the body casing ATTENTION! Breakage of the pneumatic connection pieces due to rotational impact.

  • Page 32: Display Of The Leds

    Type 8694 REV.2 Control and display elements Display of the LEDs LED 1 Display of the device status and valve position (RGB) LED 2 Display of the bus status (green) Feedback during pressing buttons to start functions • X.TUNE • Device restart •...
  • Page 33 Type 8694 REV.2 Control and display elements 7.5.1.1 Valve mode Displays in valve mode: • Valve position: open, half-way, closed • Device status: Error Valve position Valve position Device status: Error status, color status, color Open is lit yellow flashes red alternately with yellow Half-way is lit white...

  • Page 34: Status Led, Green

    Type 8694 REV.2 Control and display elements 7.5.1.3 NAMUR mode The device status LED show the device status. The display elements change color in accordance with NAMUR NE 107. If several device statuses exist simultaneously, the device status with the highest priority is displayed. The priority is determined by the severity of the deviation from controlled operation (red LED = failure = highest priority).

  • Page 35: Error Messages

    Type 8694 REV.2 Control and display elements Error messages 7.6.1 Messages for device status „Out of specification“ Message Description Procedure Temperature limit Ambient temperature is too Reduce ambient temperature. If problems exceeded high continue, contact your Bürkert Service Center Temperature limit not...
  • Page 36 Type 8694 REV.2 Control and display elements IO-Link error No valid process data is - Check connection to the IO-Link master received - Check whether valid setpoints are sent to the device via the IO-Link interface X.TUNE error occurred The last X.TUNE was not -Check compressed air supply successful.

  • Page 37: Installation

    ▶ Installation may be carried out by authorized 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. Installation of the positioner Type 8694 on process valves of series 2103, 2300 and 2301 ATTENTION! When mounting on process valves with a welded connection, follow the installation instructions in the operating instructions for the process valve.
  • Page 38 Type 8694 REV.2 Installation Puck Switch spindle Guide element Groove ring max. 1 Nm max. 5 Nm Actuator cover O-ring Spindle extension Figure 19: Installation of the switch spindle (2), series 2103, 2300 and 2301 ATTENTION! Improper installation may damage the groove ring in the guide element. The groove ring is already be pre-assembled in the guide element and must be “locked into position” in the undercut. ▶ When installing the switch spindle, do not damage the groove ring.
  • Page 39 Type 8694 REV.2 Installation 2. Install sealing rings → Pull the form seal onto the actuator cover (smaller diameter points upwards). → Check that the O-rings are correctly positioned in the pilot air ports. When the positioner is being installed, the collets of the pilot air ports must not be fitted to the actuator. Form seal Pilot air port Caution: collets must not be...

  • Page 40: Installing The Positioner Type 8694 On Process Valves Belonging To Series 26Xx And 27Xx

    1.5 Nm Connection pieces Pilot air ports Actuator Figure 22: Installation of positioner, series 2103, 2300 and 2301 Installing the positioner Type 8694 on process valves belonging to series 26xx and 27xx Procedure: 1. Install switch spindle Guide element Spindle extension Actuator...
  • Page 41 Type 8694 REV.2 Installation Puck Switch spindle Guide element O-ring Plastic part (Switch spindle) Spindle (actuator) Figure 24: Installing the switch spindle (2), series 26xx and 27xx → Press the O-ring downwards into the cover of the actuator. → Actuator size ø125 and bigger with high air flow rate: remove existing spindle extension and replace with the new one.
  • Page 42 Type 8694 REV.2 Installation 2. Install positioner → Push the positioner onto the actuator. The puck must be aligned in such a way that it is inserted into the guide rail of the positioner. ATTENTION! Damaged printed circuit board or malfunction. ▶ Ensure that the puck is situated flat on the guide rail. Guide rail Puck Figure 25: Aligning the puck →...
  • Page 43 Type 8694 REV.2 Installation 3. Install pneumatic connection between positioner and actuator Pilot air outlet 2 Pilot air outlet 2 Upper pilot air port Lower pilot air Example ∅ 80, CFA port Figure 27: Installing the positioner → Screw the plug-in hose connectors onto the positioner and the actuator.

  • Page 44: Rotating The Actuator Module

    Type 8694 REV.2 Installation Control function B (CFB) Process valve open in rest position (by spring force) ∅ 80, ∅ 100 Actuator size ∅ 125 Pilot air outlet Upper pilot air port Lower pilot air port Dry area Table 18: Pneumatic connection to actuator, CFB "In rest position" means that the pilot valves of the positioner Type 8694 are isolated or not...
  • Page 45 Type 8694 REV.2 Installation Actuator module Key contour Hexagon Nipple Nipple with hexagon without hexagon Figure 28: Rotating the actuator module → Using a suitable open-end wrench, counter the wrench flat on the pipe. → Actuator module without hexagon: Fit special key exactly in the key contour on the underside of the actuator.

  • Page 46: Rotating The Positioner For Process Valves Belonging To Series 26Xx And 27Xx

    Type 8694 REV.2 Installation Rotating the positioner for process valves belonging to series 26xx and 27xx If the connecting cables or hoses cannot be fitted properly following installation of the process valve, the positioner can be rotated contrary to the actuator. Fastening screw (2x) Positioner Pneumatic connection Actuator Figure 30: Rotating the positioner, series 26xx and 27xx Procedure →...

  • Page 47: Pneumatic Installation

    Type 8694 REV.2 Pneumatic installation PNEUMATIC INSTALLATION Safety instructions DANGER! Risk of injury from high pressure in the equipment/device. ▶ Before working on equipment or device, switch off the pressure and deaerate/drain lines. WARNING! Risk of injury from improper installation. ▶ Installation may be carried out by authorized 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 installation, ensure a controlled restart.

  • Page 48: Manual Actuation Of The Actuator Via Pilot Valves

    Pilot valve Hand lever for aerate to the left Pilot valve for deaerate Pilot valve activated Hand lever Type 8694 for high air flow rate to the right Pilot valve for aerate Pilot valve for deaerate Figure 32: Pilot valves for aerate and deaerate the actuator...
  • Page 49 → 2. Actuate hand lever pilot valve aeration. Both hand levers point to the right. The actuator moves to the end position. Type 8694 for high air flow rate Figure 33: Move actuator to end position Move actuator back to the rest position Turn the hand levers to the left using a screwdriver.

  • Page 50: Electrical Installation 24 V Dc

    Electrical installation with circular plug-in connector DANGER! Risk of electric shock. ▶ Before working on equipment or device, switch off the power supply and secure to prevent reactivation. ▶ Observe applicable accident prevention and safety regulations for electrical equipment. 10.2.1 Designation of the contacts Type 8694 View without body casing Circular plug M12 x1, 8-pin Figure 35: Circular plug M12 x 1, 8-pin...

  • Page 51: Connection Of The Positioner Type 8694

    Type 8694 REV.2 Electrical installation 24 V DC 10.2.2 Connection of the positioner Type 8694 → Connect the pins according to the model of the positioner. Input signals of the control center (e.g. PLC), circular plug M12 x 1, 8-pin...
  • Page 52 Type 8694 REV.2 Electrical installation 24 V DC View without body casing Circular plug M12 x1, 8-pin Figure 36: Circular plug M12 x 1, 8-pin Output signals to the control center (e.g. PLC), circular plug M 12 x 1, 8-pin...

  • Page 53: Electrical Installation With Cable Gland

    Type 8694 REV.2 Electrical installation 24 V DC 10.3 Electrical installation with cable gland DANGER! Risk of electric shock. ▶ Before working on equipment or device, switch off the power supply and secure to prevent reactivation. ▶ Observe applicable accident prevention and safety regulations for electrical equipment. ATTENTION! Breakage of the pneumatic connection pieces due to rotational impact. ▶ When unscrewing and screwing in the body casing, do not hold the actuator of the process valve but the basic housing.
  • Page 54 Type 8694 REV.2 Electrical installation 24 V DC * Only for variant with analog output Figure 38: Connection of screw-type terminals → Connect the positioner according to the following tables: Input signals from the control centre (e.g. PLC) Terminal Configuration External circuit + (0/4 –...
  • Page 55 Type 8694 REV.2 Electrical installation 24 V DC Output signals to the control center (e.g. PLC; for analog output option only) Terminal Configuration External circuit Analogue position feedback + + (0/4 – 20 mA) Analogue position feedback GND Table 25: Assignment of screw-type terminals, output signals to the control center, cable gland...

  • Page 56: Electrical Installation, Io-Link

    Type 8694 REV.2 Electrical installation, IO-Link ELECTRICAL INSTALLATION, IO-LINK Figure 40: Pin assignment, Port Class B Designation Configuration 24 V DC System supply 24 V DC Actuator supply L – 0 V (GND) System supply IO-Link 0 V (GND) Actuator supply...

  • Page 57: Electrical Installation, Büs

    Type 8694 REV.2 Electrical Installation, büS ELECTRICAL INSTALLATION, BÜS Figure 41: Pin assignment Wire color Configuration CAN plate/shielding CAN plate/shielding +24 V DC ±25%, max. residual ripple 10% black GND / CAN_GND white CAN_H blue CAN_L Table 28: Pin assignment For electrical installation with büS network, note: Use a 5-pin round plug and shielded 5-core cable.

  • Page 58: Start-Up

    Type 8694 REV.2 Start-up START-UP 13.1 Safety instructions DANGER! Risk of injury from high pressure in the equipment/device. ▶ Before working on equipment or device, switch off the pressure and deaerate/drain lines. WARNING! Risk of injury from improper operation. Improper operation may result in injuries as well as damage to the device and the area around it. ▶ Before start-up, ensure that the operating personnel are familiar with and completely understand the contents of the operating instructions.
  • Page 59 Type 8694 REV.2 Start-up ATTENTION! Breakage of the pneumatic connection pieces due to rotational impact. ▶ When unscrewing and screwing in the body casing or transparent cap, do not hold the actuator of the process valve but the basic housing. → To operate the DIP switches, unscrew the transparent cap...

  • Page 60: Setting With Bürkert Communicator

    Type 8694 REV.2 Start-up Body casing Seal body casing Basic housing Figure 44: Position of the seal in the body casing ATTENTION! Breakage of the pneumatic connection pieces due to rotational impact. ▶ When unscrewing and screwing in the body casing or transparent cap, do not hold the actuator of the process valve but the basic housing.

  • Page 61: Connecting Büs Device With Bürkert Communicator

    Type 8694 REV.2 Start-up Transparent cap Body casing Basic housing Actuator Figure 45: Open positioner Communications interface LED 1 LED 2 DIP Switches 1 2 3 4 Button 2 Button 1 Figure 46: Automatic adjustment X.TUNE → Insert micro USB plug in communications interface.

  • Page 62: Io-Link

    Type 8694 REV.2 IO-Link IO-LINK 14.1 Information, IO-Link IO-Link is an internationally standardized IO technology (IEC 61131-9) to enable sensors and actuators to communicate. IO-Link is a point-to-point communication with 3-wire connection technology for sensors and actuators and unshielded standard sensor cables.

  • Page 63: 15 Büs

    Type 8694 REV.2 büS BÜS 15.1 Information, büS büS is a system bus developed by Bürkert with a communication protocol based on CANopen. 15.2 Configuration of the fieldbus The required start-up files and the description of objects are available on the Internet. Download from: www.burkert.com / Type 8694 / Software english...

  • Page 64: Operation And Function

    Type 8694 REV.2 Operation and function OPERATION AND FUNCTION The positioner type 8694 has different basic and additional functions which can be configured and param- eterized via the DIP switches or the communications software. 16.1 Basic functions The following basic functions can be activated via the DIP switches (CUTOFF and CHARACT) or changed (DIR.CMD). The parameters for the sealing function (CUTOFF) and characteristic correction (CHARACT) are set using the communication software.

  • Page 65: Dir.cmd

    Type 8694 REV.2 Operation and function 16.1.1 DIR.CMD - Reversal of the effective direction of the positioner set-point value You can use this function to adjust the effective direction between the input signal (INPUT) and the nominal position of the actuator. Factory setting: DIP switch set to OFF (ascending) DIP Switches Position Function Reversal of the effective direction of the set-point value (DIR.CMD) (set-point value 20 – 4 mA corresponds to position 0 – 100 %), fall Normal effective direction of the set-point value (set-point value 4 –...

  • Page 66: Cutoff

    Type 8694 REV.2 Operation and function 16.1.2 CUTOFF - Sealing function for the positioner This function causes the valve to be sealed outside the control range. Control mode resumes at a hysteresis of 1%. Factory setting: DIP switch 2 set to OFF (no sealing function)

  • Page 67: Charact

    Type 8694 REV.2 Operation and function 16.1.3 CHARACT - Characteristic correction between input signal (position set- point value) and stroke Characteristic (customer-specific characteristic) This function can be used to activate a transfer characteristic with respect to set-point value (set-point position) and valve stroke for correction of the flow-rate or operating characteristic. The transfer characteristic can be changed via the communications software only. Factory setting: DIP switch 3 set to OFF (linear)
  • Page 68 Type 8694 REV.2 Operation and function The flow characteristic k = f(s) indicates the flow-rate of a valve, expressed by the value k as a function of the stroke s of the actuator spindle. It is determined by the design of the valve seat and the seat seal. In general two types of flow characteristics are implemented, the linear and the equal percentage. In the case of linear characteristics, equal k value changes dk are assigned to equal stroke changes ds.

  • Page 69: Input

    Type 8694 REV.2 Operation and function Entering the freely programmable characteristic The characteristic is defined by 21 nodes distributed uniformly over the position set-point values ranging from 0 – 100%. They are spaced at intervals of 5%. A freely selectable stroke (adjustment range 0 – 100%) is assigned to each node. The difference between the stroke values of two adjacent nodes must not be greater than 20%. Example of a programmed characteristic Valve stroke [&] Unit signal [%] 90 100 4 – 20 mA 0 –...

  • Page 70: Reset

    Type 8694 REV.2 Operation and function 16.1.5 RESET - Reset to factory settings This function can be used to reset the positioner to the factory settings. 16.1.6 X.TUNE - Automatic calibration of the position controller The X.TUNE function must be run for a function check of the positioner to adjust to specific local features. WARNING! While the X.TUNE function is running, the valve automatically moves from its current position. ▶ Never run X.TUNE while a process is running.

  • Page 71: Auxiliary Functions

    Type 8694 REV.2 Operation and function 16.2 Auxiliary functions The following additional functions can be configured and parameterized via the communications software: Function Description Reversal of the effective Assignment of the aeration status of the actuator chamber to the actual position direction of the actuator DIR.ACT Signal split range Signal split range; input signal as a % for which the valve runs through the entire stroke range.

  • Page 72: Dir.act

    Type 8694 REV.2 Operation and function 16.2.1 DIR.ACT - Reversal of the effective direction of the actuator Use this function to set the effective direction between the aeration state of the actuator and the actual position. Factory setting: Off (rise) Rise: Direct effective direction (deaerated → 0 %; aerated 100 %) Case: Inverse effective direction (deaerated → 100 %; aerated 0 %) Actual position increasing decreasing...

  • Page 73: Spltrng

    Type 8694 REV.2 Operation and function 16.2.2 SPLTRNG - Signal split range Minimum and maximum values of the input signal as a % for which the valve runs through the entire stroke range. Factory setting: Lower signal range split = 0 %; Upper signal range split = 100 % Lower value split range: Input the minimum value of the input signal as a % Adjustment range: 0 –...

  • Page 74: X.limit - Stroke Limit

    Type 8694 REV.2 Operation and function 16.2.3 X.LIMIT - Stroke limit This function limits the (physical) stroke to specified % values (lower and upper). In doing so, the stroke range of the limited stroke is set equal to 100 %. If the limited stroke range is left during operation, negative actual positions or actual positions greater than 100 % are shown.

  • Page 75: X.time

    Type 8694 REV.2 Operation and function 16.2.4 X.TIME - Limit actuating time Use this function to specify the opening and closing times for the entire stroke and thereby limit 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. Therefore, movement can be at maximum speed. Factory setting: values determined at the factory by the X.TUNE function If the control speed will be limited, values can be input for Open and Close which are between the minimum values determined by the X.TUNE and 60 seconds.

  • Page 76: X.control

    Type 8694 REV.2 Operation and function 16.2.5 X.CONTROL - Control parameters of the positioner Use this function to set the parameters for the positioner (dead band and amplification factors (kp)). Deadband: Insensitivity range of the positioner Entry for the deadband as a % in reference to the scaled stroke range; i.e. stroke limit maximum - stroke limit minimum (see auxiliary function stroke limit (X.LIMIT)).

  • Page 77: Sig.error

    Type 8694 REV.2 Operation and function 16.2.7 SIG.ERROR - Configuration of cable break detection (only for variant without fieldbus communication) The cable break detection function (SIG.ERROR) is used to detect a fault on the input signal. Cable break detection can be selected for a 4 – 20 mA signal only: Fault if input signal ≤ 3.5 mA (± 0.5 % of final value, hysteresis 0.5 % of final value) If 0 – 20 mA is selected, cable break detection cannot be selected. A signal error is indicated on the device by the LED 1 for activated cable break detection (error or out of spezification).

  • Page 78: Output (Variant)

    Type 8694 REV.2 Operation and function 16.2.9 OUTPUT (variant) - Configuration of the analog output (only for variant without fieldbus communication) The function analog output (OUTPUT) only appears in the selection of functions if the positioner has an analog output (variant) or if no parameters have been read in yet.

  • Page 79: Safety End Positions

    Type 8694 REV.2 Safety end positions SAFETY END POSITIONS 17.1 Safety end positions after failure of the electrical or pneumatic auxiliary power Safety end positions after failure of the auxiliary power Actuator system Designation electrical pneumatic pilot valve system with high air flow rate: single-acting down down Control pilot valve system function A...

  • Page 80: Maintenance

    Type 8694 REV.2 Maintenance MAINTENANCE 18.1 Safety instructions DANGER! Risk of injury from high pressure in the equipment/device. ▶ Before working on equipment or device, switch off the pressure and deaerate/drain lines. Risk of electric shock. ▶ Before working on equipment or device, switch off the power supply and secure to prevent reactivation. ▶ Observe applicable accident prevention and safety regulations for electrical equipment. WARNING! Risk of injury from improper maintenance. ▶ Maintenance may be performed by authorised technicians only. Risk of injury from unintentional activation of the system and an uncontrolled restart. ▶ Secure system from unintentional activation.

  • Page 81: Service At The Air Intake Filter

    Type 8694 REV.2 Maintenance 18.2 Service at the air intake filter DANGER! Risk of injury from high pressure in the equipment/device. ▶ Before working on equipment or device, switch off the pressure and deaerate/drain lines. To protect the internal solenoid valves and the actuator, the pilot air is filtered. The direction of flow of the air intake filter in installed state is from the inside to the outside through the filter material. Quick connector O-ring Air intake filter Figure 56: Service on the air intake filter Procedure: → Unlock the quick connector by pressing the holding element and pulling out the air intake filter (if nec- essary, use a suitable tool in between the recesses in the head of the filter). → Clean the filter or, if necessary, replace the filter. → Check inner O-ring and, if required, clean.

  • Page 82: Accessories

    Type 8694 REV.2 Accessories ACCESSORIES Designation Order no. Special wrench 665702 Wrench for opening/closing the transparent cap 674077 Communication software Bürkert Communicator Information at www.burkert.com USB-büS interface set: USB-büS interface set 2 (büS stick + 0.7 m cable with M12 plug) 772551 büS adapter for büS service interface...

  • Page 83: Disassembly

    Type 8694 REV.2 Disassembly DISASSEMBLY 20.1 Safety instructions DANGER! Risk of injury from high pressure in the equipment/device. ▶ Before working on equipment or device, switch off the pressure and deaerate/drain lines. Risk of electric shock. ▶ Before working on equipment or device, switch off the power supply and secure to prevent reactivation. ▶ Observe applicable accident prevention and safety regulations for electrical equipment. WARNING! Risk of injury from improper disassembly. ▶ Disassembly may be carried out by authorized technicians only and with the appropriate tools.
  • Page 84 Type 8694 REV.2 Disassembly 2. Electrical connection DANGER! Risk of electric shock. ▶ Before working on equipment or device, switch off the power supply and secure to prevent reactivation. ▶ Observe applicable accident prevention and safety regulations for electrical equipment. Circular plug-in connector: → Loosen the circular plug-in connector. Cable gland: → Open the positioner: unscrewing the body casing in an anticlockwise direction.

  • Page 85: Transportation, Storage, Disposal

    Type 8694 REV.2 Transportation, storage, disposal TRANSPORTATION, STORAGE, DISPOSAL ATTENTION Damage in transit due to inadequately protected devices. ▶ Protect the device against moisture and dirt in shock-resistant packaging during transportation. ▶ Observe permitted storage temperature. ATTENTION Incorrect storage may damage the device. ▶ Store the device in a dry and dust-free location.
  • Page 86 Type 8694 REV.2 english...
  • Page 87 www.burkert.com...

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