Burkert 8694 Operating Instructions Manual
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Burkert 8694 Operating Instructions Manual

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

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Summary of Contents for Burkert 8694

  • Page 1 Type 8694 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, 2008 - 2021 Operating Instructions 2111/11_EN-EN_00805886 / Original DE...

  • Page 3: Table Of Contents

    Features ..............................14 5.4.3 Function diagram of the positioner with single-acting actuator ..........15 Type 8694 positioner (position controller) ......................16 5.5 5.5.1 Schematic representation of the position control Type 8694 ..........16 5.5.2 Functions of the position controller software ................17 Interfaces of the positioner ............................19 5.6 TECHNICAL DATA .....................................20 6.1 Conformity ....................................20...
  • Page 4 7.6.1 Error messages in MANUAL and AUTOMATIC operating statuses .........32 7.6.2 Error messages while the X.TUNE function is running ..............32 INSTALLATION ....................................33 8.1 Safety instructions ................................33 8.2 Installation of the positioner Type 8694 on process valves of series 2103, 2300 and 2301 ..33 8.3 Installing the positioner Type 8694 on process valves belonging to series 26xx and 27xx ..36 8.4 Rotating the actuator module ............................40 8.5 Rotating the positioner for process valves belonging to series 26xx and 27xx .......42 PNEUMATIC INSTALLATION ...............................43 Manual actuation of the actuator via pilot valves ....................44 9.1...
  • Page 5 Type 8694  10.2 Electrical installation with circular plug-in connector ..................46 10.2.1 Designation of the contacts Type 8694 ..................46 10.2.2 Connection of the positioner Type 8694 ..................47 10.3 Electrical installation with cable gland ........................48 AS-INTERFACE INSTALLATION ..............................51 11.1 AS-Interface connection ..............................51 11.2 Maximum length of the bus line ..........................51 11.3 Technical data for AS-Interface PCBs ........................51 11.4 Programming data ................................52 11.5 Communication sequence for the version S-7.A.5 profile ................53 11.6 LED status display ................................54 11.7 Electrical installation AS-interface ..........................55...
  • Page 6 Type 8694  13.2 Auxiliary functions .................................. 68 13.2.1. DIR.ACTUATOR - Effective direction of the actuator ....................68 13.2.2. SPLITRANGE - Signal split range ..........................69 13.2.3. X.LIMIT - Limiting the mechanical stroke range ....................70 13.2.4. X.TIME - Limiting the control speed ........................71 13.2.5.

  • Page 7: Operating Instructions

    ▶ Designates an instruction to prevent risks. → Designates a procedure which you must carry out. 1.2 Definition of term / abbreviation The term “device” used in these instructions always stands for the positioner Type 8694. In these instructions, the abbreviation “Ex” always refers to “potentially explosive atmosphere”. english...

  • Page 8: Authorized Use

    ▶ Correct transportation, correct storage and installation and careful use and maintenance are essential for reli- able and faultless operation. ▶ Use the positioner Type 8694 only as intended. 2.1 Restrictions If exporting the system/device, observe any existing restrictions.

  • Page 9: Basic Safety Instructions

    General hazardous situations. To prevent injury, ensure: ▶ In the potentially explosive atmosphere the positioner Type 8694 may be used only according to the specification on the separate approval sticker. For use observe the additional instructions enclosed with the device together with safety instructions for the potentially explosive atmosphere.

  • Page 10: General Information

    And also on the Internet at: www.burkert.com 4.2 Warranty The warranty is only valid if the positioner Type 8694 is used as intended in accordance with the specified appli- cation conditions. 4.3 Trademarks Brands and trademarks listed below are trademarks of the corresponding companies / associations / organizations...

  • Page 11: System Description

    Type 8694 Systemdescription SYSTEM DESCRIPTION 5.1 Intended application area The positioner Type 8694 is designed to be mounted on pneumatic actuators of process valves for the control of media. 5.2 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 12: Features Of The Valve Types

    Type 8694 Systemdescription 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.

  • Page 13: Structure Of The Positioner

    5.4 Structure of the positioner The positioner Type 8694 consists of the micro-processor controlled electronics, the position measuring system and the control system. The device is designed using three-wire technology. The positioner is operated via 2 keys and a 4-pole DIP switch. The pneumatic control system for single-acting actuators consists of 2 solenoid valves.

  • Page 14: Features

    Type 8694 Systemdescription 5.4.2 Features • Models for single-acting valve actuators. • Position measuring system Contactless and therefore wear-free position measuring system. • 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. 2x 2-colored LEDs indicate different statuses of the device.

  • Page 15: Function Diagram Of The Positioner With Single-Acting Actuator

    Type 8694 Systemdescription 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 Control system Positioner position 1: Aeration valve Control system 2: Bleed valve Pressure Position supply...

  • Page 16: Type 8694 Positioner (Position Controller)

    Type 8694 Systemdescription 5.5 Type 8694 positioner (position controller) The position measuring system records the current position (POS) of the pneumatic actuator. The position controller compares this actual position value with the set-point value (CMD) which is definable as standard signal. In case of a control deviation (Xd1), a pulse-width modulated voltage signal is sent to the control system as a manipu- lated variable.

  • Page 17: Functions Of The Position Controller Software

    Type 8694 Systemdescription 5.5.2 Functions of the position controller software Functions I • Activation via DIP switches • Parameter setting via communications software Additional function Effect Valve closes tight outside the control range. Specification Sealing function of the value (as %), from which the actuator is completely...
  • Page 18 Type 8694 Systemdescription Functions II • Activation and parameter setting via communications software Additional function Effect Standard signal for set-point value Select set-point value standard signal INPUT Effective direction of the actuator Assignment of the aeration status of the actuator chamber to the actual position.

  • Page 19: Interfaces Of The Positioner

    Figure 6: Interfaces The positioner Type 8694 is a 3-wire device, i.e. the power (24 V DC) is supplied separately from the set- point value signal. • Input for position set-point value (4 – 20 mA corresponds to 0 – 100 % (depending on position of DIP switch 1)).

  • Page 20: Technical Data

    TECHNICAL DATA 6.1 Conformity In accordance with the EU Declaration of conformity, the positioner Type 8694 is compliant with the EU Directives. 6.2 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.

  • Page 21: Mechanical Data

    Socket connection G1/8 6.7 Type labels 6.7.1 Type label standard Supply voltage / Control Control function - Pilot valve Type 8694 24 V DC Max. operating pressure single act Pilot 0,6 Pmax 7bar Max. ambient temperature Tamb 0°C - +60°C S/N 001000 00185134...

  • Page 22: Ul Type Label

    Type 8694 Technicaldata 6.7.2 UL type label Example: Type; Features of the type code applicable to UL and ATEX Control function; pilot valve; Supply voltage pilot valve 8694 -E3-...-0 PU02 Single act Pilot 3.0 24V Max. operating pressure Pmax 7 bar Tamb -10 - +55 °C Max.

  • Page 23: Electrical Data With As-Interface Bus Control

    Type 8694 Technicaldata Analogue position feedback max. load 560 Ω for current output 0/4 – 20 mA Binary input 0 – 5 V = log “0”, 12 - 30 V = log “1” inverted input in reverse order Communications interface Direct connection to PC via USB adapter with integrated interface driver, communication with communications software, see “Table 34: Accessories”.

  • Page 24: Factory Settings Of The Positioner

    Type 8694 Technicaldata 6.9 Factory settings of the positioner Functions can be activated via DIP switches: Function Parameter Value CUTOFF Sealing function below Sealing function above 98 % CHARACT Select characteristic FREE DIR.CMD Effective direction set-point value rise Table 4: Factory settings - Functions I...

  • Page 25: Control And Display Elements

    Type 8694 Controlanddisplayelements 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 “12 Start-up”. 7.1...
  • Page 26 Type 8694 Controlanddisplayelements The positioner features 2 buttons, 4-pole DIP switches and 2x 2-colored LEDs as a display element. NOTE! 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 pro- cess valve but the connection housing.

  • Page 27: Configuration Of The Keys

    Type 8694 Controlanddisplayelements 7.3 Configuration of the keys The configuration of the 2 keys varies depending on the operating status (AUTOMATIC / MANUAL). The description of the operating statuses (AUTOMATIC / MANUAL) can be found in the chapter entitled “7.1 Operating status”. Version 1...
  • Page 28 Type 8694 Controlanddisplayelements MANUAL operating status (DIP switch 4 set to ON): Function Aerate (manually open / close the actuator) Deaerate (manually open / close the actuator) Table 6: Configuration of the keys for MANUAL operating status AUTOMATIC operating status (DIP switch 4 set to OFF): Function Press for 5 seconds to start the X.TUNE function...

  • Page 29: Function Of The Dip Switches

    Type 8694 Controlanddisplayelements 7.4 Function of the DIP switches 1 2 3 4 NOTE! 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 pro- cess valve but the connection housing. → To operate the DIP switches, for...
  • Page 30 Type 8694 Controlanddisplayelements 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).

  • Page 31: Display Of The Leds

    Type 8694 Controlanddisplayelements 7.5 Display of the LEDs Version 1 Version 2 LED 1 LED 2 LED 1 Display of mode statuses (green / AUTO, MANUAL, red) X.TUNE and FAULT LED 2 Display of the actuator status (green / (open, closed, opens yellow)

  • Page 32: Error Messages

    Type 8694 Controlanddisplayelements 7.6 Error messages 7.6.1 Error messages in MANUAL and AUTOMATIC operating statuses Display Cause of fault Remedial action LED 1 (red) Checksum error in data memory Not possible, device defective → Data memory defective → The device automatically switches to an older (possibly not current) data record.

  • Page 33: Installation

    Type 8694 Installation INSTALLATION 8.1 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.
  • Page 34 Type 8694 Installation → For version with plug-in hose connector, remove the collets (white nozzles) from both pilot air ports (if present). Puck Switch spindle Guide element Groove ring max. 1 Nm max. 5 Nm Actuator cover O-ring Spindle extension...
  • Page 35 Type 8694 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.

  • Page 36: Installing The Positioner Type 8694 On Process Valves Belonging To Series 26Xx And 27Xx

    Type 8694 Installation → Push the positioner, without turning it, onto the actuator until no gap is visible on the form seal. NOTE! Too high torque when screwing in the fastening screw does not ensure degree of protection IP65 / IP67. ▶ The fastening screws may be tightened to a maximum torque of 1.5 Nm only.
  • Page 37 Type 8694 Installation Puck Switch spindle Guide element O-ring Plastic part (Switch spindle) Spindle (actuator) Figure 25: Installing the switch spindle (2), series 26xx and 27xx → Press the O-ring downwards into the cover of the actuator. → Actuator size 125 and bigger with high air flow rate: remove existing spindle extension and replace with the new one.
  • Page 38 Type 8694 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. NOTE! Damaged printed circuit board or malfunction. ▶ Ensure that the puck is situated flat on the guide rail.
  • Page 39 Type 8694 Installation 3. Install pneumatic connection between positioner and actuator Pilot air outlet 2 Pilot air outlet 2 Upper pilot air port Lower pilot air port Example ∅ 80, CFA Figure 28: Installing the positioner → Screw the plug-in hose connectors onto the positioner and the actuator.

  • Page 40: Rotating The Actuator Module

    Dry area Table 14: Pneumatic connection to actuator - CFB "In rest position" means that the pilot valves of the positioner Type 8694 are isolated or not actuated. 8.4 Rotating the actuator module The actuator module (positioner and actuator) can be rotated for straight seat valves and angle seat valves belonging to series 2300, 2301 and 27xx only.
  • Page 41 Type 8694 Installation Actuator module Key contour Hexagon Nipple Nipple with hexagon without hexagon Figure 29: 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 42: Rotating The Positioner For Process Valves Belonging To Series 26Xx And 27Xx

    Type 8694 Installation 8.5 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 31:...

  • Page 43: Pneumatic Installation

    Type 8694 Pneumaticinstallation PNEUMATIC INSTALLATION 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.

  • Page 44: Manual Actuation Of The Actuator Via Pilot Valves

    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 33: Pilot valves for aerate and deaerate the actuator...
  • Page 45 → 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 34: Move actuator to end position Move actuator back to the rest position Turn the hand levers to the left using a screwdriver.

  • Page 46: Electrical Installation 24 V Dc

    Type 8694 Electricalinstallation24VDC ELECTRICAL INSTALLATION 24 V DC All electrical inputs and outputs of the device are not galvanically isolated from the supply voltage. Two kinds of connections are used for the electrical bonding of the positioner: • Cable gland with cable gland M16 x 1.5 and screw-type terminals •...

  • Page 47: Connection Of The Positioner Type 8694

    Type 8694 Electricalinstallation24VDC 10.2.2 Connection of the positioner Type 8694 → Connect the pins according to the model (options) of the positioner. Input signals of the control center (e.g. PLC) - circular plug M12 x 1, 8-pole Wire color Configuration External circuit / signal level Set-point value + (0/4 – 20 mA) white + (0/4 ...

  • Page 48: Electrical Installation With Cable Gland

    Type 8694 Electricalinstallation24VDC 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. NOTE! 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 connection housing.
  • Page 49 Type 8694 Electricalinstallation24VDC 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 ... 20 mA) Set-point value + Set-point value GND Binary input + 0 ...
  • Page 50 Type 8694 Electricalinstallation24VDC Body casing Seal body casing Connection housing Figure 39: Position of the seal in the body casing → Check that the seal is correctly positioned in the body casing. NOTE! 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 connection housing.

  • Page 51: As-Interface Installation

    Type 8694 AS-Interfaceinstallation AS-INTERFACE INSTALLATION 11.1 AS-Interface connection AS-Interface (Actuator Sensor Interface) is a field bus system which is used primarily for networking binary sensors and actuators (slaves) with a higher-level control (master). Bus line Unshielded two-wire line (AS-Interface line as AS-Interface flat cable) along which both information (data) and energy (power supply for the actuators and sensors) are transmitted.

  • Page 52: Programming Data

    Type 8694 AS-Interfaceinstallation 11.4 Programming data Version Profile S-7.3.4 Version Profile S-7.A.5 I/O configuration 7 hex 7 hex ID code 3 hex (analog profile) A hex F hex Extended ID code 1 7 hex (Default value, can be changed by the user)

  • Page 53: Communication Sequence For The Version S-7.A.5 Profile

    Type 8694 AS-Interfaceinstallation 11.5 Communication sequence for the version S-7.A.5 profile 1. Following start-up, the AS-Interface master (from master class 4) automatically replaces the ID object with the S-7.A.5 slave. Master transmits 3 bytes: S-7.A.5 slave replies with 6 bytes 1. Byte: Code = 16 dez 1.

  • Page 54: Led Status Display

    Type 8694 AS-Interfaceinstallation 11.6 LED status display NOTE! 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 connection housing. The LED status display indicates the bus status (LED green and red).

  • Page 55: Electrical Installation As-Interface

    Type 8694 AS-Interfaceinstallation → Check that the seal is correctly positioned in the body casing. NOTE! 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 connection housing. Damage or malfunction due to penetration of dirt and humidity.

  • Page 56: Connection With Circular Plug-In Connector M12 X 1, 4-Pole, Male

    (M12 circular plug) and ribbon cable terminal. The wiring diagram of the circular plug corresponds to the bus con- nection of the M12 4-pole circular plug (see “Figure 42” and “Figure 43”) and can easily be connected to the ribbon cable terminal (see “Figure 45”). Figure 44: Positioner 8694 with multi-pole cable and ribbon cable terminal english...
  • Page 57 Type 8694 AS-Interfaceinstallation Calculated bus line length: When designing the system, consider the length of the cable which is fed directly to the positioner for the maximum bus line length (multi-pole cable and cable inside: 1.0 m). Example calculation: When using 62 positioner with multi-pole cable, the AS-Interface flat cable may still be maximum 38 m long.

  • Page 58: Start-Up

    Type 8694 Start-up START-UP 12.1 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.
  • Page 59 Type 8694 Start-up NOTE! 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 pro- cess valve but the connection housing. → To operate the DIP switches, for Version 1:...
  • Page 60 Type 8694 Start-up Body casing Seal body casing Connection housing Figure 48: Position of the seal in the body casing → Version 1: Check that the seal is correctly positioned in the body casing. NOTE! 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 pro- cess valve but the connection housing.

  • Page 61: Operation And Function

    Type 8694 Operationandfunction OPERATION AND FUNCTION The positioner type 8694 has different basic and additional functions which can be configured and parameterized via the DIP switches or the communications software. 13.1 Basic functions The following basic functions can be activated via the DIP switches (CUTOFF and CHARACT) or changed (DIR.CMD).

  • Page 62: Dir.cmd

    Type 8694 Operationandfunction 13.1.1 DIR.CMD - 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)

  • Page 63: Cutoff

    Type 8694 Operationandfunction 13.1.2 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) DIP Switches Position Function Sealing function active.

  • Page 64: Charact

    Type 8694 Operationandfunction 13.1.3 CHARACT - Select the transfer characteristic 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.
  • Page 65 Type 8694 Operationandfunction 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.

  • Page 66: Input - Enter The Input Signal

    Type 8694 Operationandfunction 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.

  • Page 67: Reset

    Type 8694 Operationandfunction 13.1.5 RESET - Reset to factory settings This function can be used to reset the positioner to the factory settings. 13.1.6 X.TUNE - Automatic adjustment of the positioner to the relevant operating conditions The X.TUNE function must be run for a function check of the positioner to adjust to specific local features.

  • Page 68: Auxiliary Functions

    Type 8694 Operationandfunction 13.2 Auxiliary functions The following additional functions can be configured and parameterized via the communications software: Function Description DIR.ACTUATOR Assignment of the aeration status of the actuator chamber to the actual position SPLITRANGE Signal split range; input signal as a % for which the valve runs through the entire stroke range.

  • Page 69: Splitrange - Signal Split Range

    Type 8694 Operationandfunction 13.2.2 SPLITRANGE - 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 %...

  • Page 70: X.limit

    Type 8694 Operationandfunction 13.2.3 X.LIMIT - Limiting the mechanical stroke range 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 posi- tions or actual positions greater than 100 % are shown.

  • Page 71: X.time

    Type 8694 Operationandfunction 13.2.4 X.TIME - Limiting the control speed 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 auto- matically entered for Open and Close.

  • Page 72: X.control

    Type 8694 Operationandfunction 13.2.5 X.CONTROL - Parameterization 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;...

  • Page 73: Signal.error

    Type 8694 Operationandfunction 13.2.7 SIGNAL.ERROR - Configuration of signal level fault detection The SIGNAL ERROR function is used to detect a fault on the input signal. Fault detection Fault 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 –...

  • Page 74: Output (Optional)

    Type 8694 Operationandfunction 13.2.9 OUTPUT (optional) - Configuration of the analog output The OUTPUT menu item only appears in the selection of auxiliary functions if the positioner has an analog output (optional) or if no parameters have been read in yet. The analog output can be used for feedback of the current position or of the set-point value to the control center.

  • Page 75: Safety End Positions

    Type 8694 Safetyendpositions SAFETY END POSITIONS 14.1 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-controlled control system: single-acting down down Control direct-acting control function A system: down not defined pilot-controlled control system: single-acting Control direct-acting control function B system: down not defined...

  • Page 76: Maintenance

    Type 8694 Maintenance MAINTENANCE 15.1 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.

  • Page 77: Service At The Air Intake Filter

    Type 8694 Maintenance 15.2 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.

  • Page 78: Accessories

    Type 8694 Accessories ACCESSORIES Designation Order no. USB adapter for connection to a PC in conjunction with an extension cable 227093 Communicator Information at www.burkert.com Connection cable M12 x 1, 8-pole 919061 Assembly tool 647077 Table 34: Accessories 16.1 Communications software The PC operating program “Communicator” is designed for communication with the devices from the Bürkert posi- tioner family (valid since serial number 20000).

  • Page 79: Disassembly

    Type 8694 Disassembly DISASSEMBLY 17.1 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.
  • Page 80 Type 8694 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: →...

  • Page 81: Packaging And Transport

    Type 8694 Packagingandtransport 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 the effects of heat and cold which could result in temperatures above or below the permitted storage temperature.
  • Page 82 Type 8694  english...
  • Page 83 www.burkert.com...

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