burkert 8694 Positioner Top Control Basic User Manual

: June 13, 2024
: burkert

Table of Contents

burkert 8694 Positioner Top Control Basic
Product Information:
Product Usage Instructions:
Operation and Function
OPERATING INSTRUCTIONS
AUTHORIZED USE
GENERAL INFORMATION
SYSTEM DESCRIPTION
TECHNICAL DATA
BINARY INPUT
PACKAGING AND TRANSPORT
References
Read User Manual Online (PDF format)
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burkert 8694 Positioner Top Control Basic

burkert-8694-Positioner-Top-Control-Basic

Product Information:

Product Name: Type 8694 Positioner Top Control Basic
Description: Electropneumatic position controller
Manufacturer: Unknown
Manual Source: https://manual-hub.com/

Product Usage Instructions:

Authorized Use
The Type 8694 positioner is designed for a specific range of applications. Ensure that you are using it within the authorized use limits mentioned in the manual.

Restrictions:
Refer to section 2.1 of the manual for any restrictions on usage.

Basic Safety Instructions
Prior to installation and usage, carefully read and understand the basic safety instructions provided in section 3 of the manual.

Pneumatic Installation
To manually actuate the actuator via pilot valves, follow the instructions provided in section 9 of the manual. For single-acting actuators (control function A and B), refer to section 9.1.1 for specific instructions.

Electrical Installation 24 V DC
For electrical installation using a circular plug-in connector, follow the guidelines in section 10.2 of the manual.
Make sure to comply with the safety instructions mentioned in section 10.1. For information on the designation of the contacts and connection of the positioner Type 8694, refer to sections 10.2.1 and 10.2.2 respectively.
If you choose to use a cable gland for electrical installation, follow the instructions provided in section 10.3.

Operation and Function

For detailed information about the operation and basic functions of the Type 8694 positioner, refer to section 13 of the manual.

The following functions are covered:

DIR.CMD: Effective direction of the positioner set-point value (see section 13.1.1)
CUTOFF: Sealing function for the positioner (see section 13.1.2)
CHARACT: Select the transfer characteristic between input signal (position set-point value) and stroke (see section 13.1.3)

Type 8694 Positioner Top Control Basic
Electropneumatic position controller
Operating Instructions
https://manual-hub.com/

We reserve the right to make technical changes without notice. Technische Änderungen vorbehalten. Sous réserve de modifications techniques. © Bürkert Werke GmbH & Co. KG, 2008 – 2019 Operating Instructions 1909/10_EN-EN_00805886 / Original DE

Type 8694 Operating instructions

OPERATING INSTRUCTIONS

The operating instructions describe the entire life cycle of the device. Keep these instructions in a location which is easily accessible to every user, and make these instructions available to every new owner of the device.

Important safety information.
Read the operating instruction carefully and thoroughly. Study in particular the chapters entitled “Basic safety instructions” and “Authorized use”.
The operating instructions must be read and understood.

1.1 Symbols

DANGER! Warns of an immediate danger. Failure to observe the warning will result in a fatal or serious injury.

WARNING! Warns of a potentially dangerous situation. Failure to observe the warning may result in serious injuries or death.

CAUTION! Warns of a possible danger. Failure to observe this warning may result in a moderate or minor injury.

NOTE! Warns of damage to property. · Failure to observe the warning may result in damage to the device or the equipment.

Indicates important additional information, tips and recommendations.

refers to information in these operating instructions or in other documentation.

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”.
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Type 8694 Authorized use

AUTHORIZED USE

Non-authorized use of the positioner Type 8694 may be a hazard to people, nearby equipment and the environment.
The device is designed to be mounted on pneumatic actuators of process valves for the control of media.
Do not expose the device to direct sunlight.
Use according to the authorized data, operating conditions and conditions of use specified in the contract documents and operating instructions. These are described in the chapter entitled “6 Technical data”.
The device may be used only in conjunction with third-party devices and components recommended and authorized by Bürkert.
In view of the large number of options for use, before installation, it is essential to study and if necessary to test whether the positioner is suitable for the actual use planned.
Correct transportation, correct storage and installation and careful use and maintenance are essential for reliable and faultless operation.
Use the positioner Type 8694 only as intended.

2.1 Restrictions
If exporting the system/device, observe any existing restrictions.

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Type 8694 Basic safety instructions

BASIC SAFETY INSTRUCTIONS

These safety instructions do not make allowance for any · contingencies and events which may arise during the installation, operation and maintenance of the devices.
· local safety regulations the operator is responsible for observing these regulations, also with reference to the installation personnel.

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.

General hazardous situations.
To prevent injury, ensure:
In the potentially explosion-risk area 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 explosion-risk area.
Devices without a separate approval sticker may not be used in a potentially explosive area. That the system cannot be activated unintentionally. Installation and repair work may be carried out by authorized technicians only and with the appropriate tools. After an interruption in the power supply or pneumatic supply, ensure that the process is restarted in a defined
or controlled manner.
The device may be operated only when in perfect condition and in consideration of the operating instructions. The general rules of technology apply to application planning and operation of the device. To prevent damage to property on the device, ensure:
Do not feed any aggressive or flammable media into the pilot air port. Do not feed any liquids into the pilot air port. When unscrewing and screwing in the body casing or the transparent cap, do not hold the actuator of the pro-
cess valve but the connection housing of Type 8694.
Do not put any loads on the housing (e.g. by placing objects on it or standing on it). Do not make any external modifications to the device bodies. Do not paint the housing parts or screws.

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Type 8694 Basic safety instructions

NOTE!
Electrostatic sensitive components / modules.
The device contains electronic components, which react sensitively to electrostatic discharge (ESD). Contact with electrostatically charged persons or objects is hazardous to these components. In the worst case scenario, they will be destroyed immediately or will fail after start-up.
Observe the requirements in accordance with EN 100 015 – 1 and to minimize or avoid the possibility of damage caused by sudden electrostatic discharge.
Also ensure that you do not touch electronic components when the power supply is on.

GENERAL INFORMATION

4.1 Contact address
Germany Bürkert Fluid Control System Sales Center Chr.-Bürkert-Str. 13-17 D-74653 Ingelfingen Tel. + 49 (0) 7940 – 10 91 111 Fax + 49 (0) 7940 – 10 91 448 E-mail: info@burkert.com
International Contact addresses can be found on the final pages of the printed operating instructions. 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 application conditions.
4.3 Trademarks
Brands and trademarks listed below are trademarks of the corresponding companies / associations / organizations Loctite Henkel Loctite Deutschland GmbH
4.4 Information on the internet
The operating instructions and data sheets for Type 8694 can be found on the Internet at: www.burkert.com
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Type 8694 System description

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. Together with the pneumatic actuator, the positioner forms a functional unit. The control valve systems can be used for a wide range of control tasks in fluid technology and, depending on the application conditions, different process valves belonging to series 2103, 2300, 2301, 26xx or 27xx from the Bürkert range can be combined with the positioner. Angle-seat valves, diaphragm valves or ball valves fitted with a control cone are suitable. “Figure 1” shows an overview of the possible combinations of positioner and different pneumatically actuated valves. Different actuator sizes and valve nominal widths, not illustrated here, are available for each type. More precise specifications can be found on the respective data sheets. The product range is being continuously expanded.
Positioner Type 8694

with angle seat valve Type 2300

with straight seat valve Type 2301

with angle seat valve Type 2702

with diaphragm valve
Type 2730

Figure 1: Overview of possible combinations

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Type 8694 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. The piston moves until there is an equilibrium of forces between compressive force and spring force.

5.3 Features of the valve types

Types Features

Angle seat control valves / straight seat control valves · 2300
· 2301
· 2702
· 2712 · incoming flow under
seat
· no closing impact
· straight flow path of the medium
· self-adjusting stuffing box for high leak-tightness

Typical media
Table 1:

· water, steam and gases
· alcohols, oils, propellants, hydraulic fluids
· salt solutions, lyes (organic)
· solvents Features of the valve types

Diaphragm valves

Ball valves

Flap valves

· 2103 · 2730 · 2731

· 2652 · 2655 · 2658

· 2672 · 2675

· medium is hermetically separated from the actuator and environment
· cavity-free and selfdraining body design
· any flow direction with low-turbulence flow
· steam-sterilizable
· CIP-compliant
· no closing impact

· scrapable
· minimum dead space
· unaffected by contamination
· little pressure loss compared to other valve types
· seat and seal can be exchanged in the three-piece ball valve when installed

· unaffected by contamination
· little pressure loss compared to other valve types
· inexpensive
· low construction volume

· actuator and diaphragm can be removed when the body is installed
· neutral gases and liquids

Note can be used as process controller only

· neutral gases and liquids

· contaminated, abrasive and aggressive media
· media of higher viscosity

· clean water
· slightly aggressive media

· slightly aggressive media

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Type 8694 System description

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.

5.4.1 Representation
Version 1

Version 2

Transparent cap

Body casing

Pressure limiting valve (for protection against too high internal pressure in
case of error)

Connection housing

Exhaust air connection (label: 3)

Pressure supply connection (label: 1)

Body casing removed: LED

Buttons

Exhaust air connection (label: 3)

DIP Switches
Communications interface

Pressure supply connection (label: 1)
Communications interface
LED
Screwtype terminals

Air intake filter (exchangeable)

Air intake filter (exchangeable)
Electrical connection (cable gland M16 x 1.5 or circular plug-in connector M12 x 1)

Additional exhaust air port (label: 3.1) only for Type 23xx and 2103
with pilot-operated control system for high air flow rate (actuator size ø 130)
Figure 2: Structure 13

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Type 8694 System description

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.
· Control system The control system consists of 2 solenoid valves. One valve is used to aerate and another to deaerate the pneumatic actuator. The solenoid valves operate according to the rocker principle and are controlled with a PWM voltage via the controller. Doing so achieves a higher flexibility with regard to actuator volume and final control speed. The direct-action model has an orifice of DN 0.6. In larger pneumatic actuators the solenoid valves feature diaphragm amplifiers to increase the maximum flow and therefore to improve the dynamics (DN 2.5).
· Position feedback (optional) The position of the valve can be transmitted to the PLC via an analog 0/4-20 mA output.
· Binary input If a voltage > 10 V is applied, SAFE POSITION is activated, i.e. the valve is moved to the safety position (factory setting, can be changed with communications software).
· Pneumatic interfaces 1/4″ connections with different thread forms (G, NPT) hose plug-in connection

· Electrical interfaces Circular plug-in connector or cable gland

Pneumatic interface

Electrical interface

· Body The body of the positioner is protected from excessively high internal pressure, e.g. due to leaks, by a pressure limiting valve.

· Communications interface

For configuration and parameterization.

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Type 8694 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

Positioner

Actual position

Position measuring system

Position controller
Control system
1
2

Control system 1: Aeration valve 2: Bleed valve
Pressure supply

Exhaust air

Pneumatic actuator (single-acting)

Valve (actuator)

Figure 3: Function diagram

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Type 8694 System description

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 manipulated variable. If there is a positive control difference in single-acting actuators, the air inlet valve is controlled via output B1. If the control difference is negative, the bleed valve is controlled via output E1. In this way the position of the actuator is changed until control difference is 0. Z1 represents a disturbance variable.

CMD

Xd1

Position set-point value

Position controller

Valve opening

Control system Control valve Solenoid valves

POS

Position control circuit

Position measuring system

Figure 4:
5.5.1

Signal flow plan of position controller
Schematic representation of the position control Type 8694

4 … 20 mA1) 0 … 20 mA

POS DIR.ACT2) X.LIMIT2)

INP DIR.CMD SPLTRNG2) CHARACT CUTOFF

CMD X.TIME2)

X.CONTROL DBND

Default setting 2) Can only be activated with communications software
Figure 5: Schematic representation of position control 16

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POS CMD

Type 8694 System description

5.5.2 Functions of the position controller software
Functions I · Activation via DIP switches · Parameter setting via communications software

Additional function

Effect

Sealing function CUTOFF

Valve closes tight outside the control range. Specification of the value (as %), from which the actuator is completely deaerated (when 0 %) or aerated (when 100 %) (see chapter “7.4 Function of the DIP switches”).

Correction line to adjust the operating characteristic Linearization of the operating characteristic can be imple-

CHARACT

mented (see chapter “7.4 Function of the DIP switches”).

Effective direction of the controller set-point value DIR.CMD

Table 2:

Functions I

Reversal of the effective direction of the set-point value (see chapter “7.4 Function of the DIP switches”).

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Type 8694 System description

Functions II · Activation and parameter setting via communications software

Additional function

Standard signal for set-point value INPUT

Effective direction of the actuator DIR.ACTUATOR

Signal split range SPLITRANGE

Mechanical stroke range limit X.LIMIT

Opening and closing time X.TIME

Position controller X.CONTROL

Safety position SAFE POSITION

Signal level fault detection SIGNAL ERROR

Binary input BINARY INPUT

Analog output OUTPUT

Reset RESET Table 3:

Functions II

Effect Select set-point value standard signal Assignment of the aeration status of the actuator chamber to the actual position. Standard signal as % for which the valve runs through the entire mechanical stroke range. Limit the mechanical stroke range
Limit the control speed
Parameterize the position controller
Definition of the safety position
Configuration of signal level fault detection
Configuration of the binary input
Configuration of the analog output (optional)
Reset to factory settings

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Type 8694 System description

5.6 Interfaces of the positioner

Input for position set-point value3) 4 20 mA4) 0 20 mA
Binary input

Positioner

Analog position feedback (optional)

Outputs

Inputs

Power

24 V DC
Communications interface

Operation

Or optional bus connection AS interface 4) Default setting
Figure 6: Interfaces
The positioner Type 8694 is a 3-wire device, i.e. the power (24 V DC) is supplied separately from the setpoint value signal.
· Input for position set-point value (4 20 mA corresponds to 0 100 % (depending on position of DIP switch 1)).
· Binary input If a voltage > 10 V is applied, SAFE POSITION is activated, i.e. the valve is moved to the safety position (factory setting, can be changed with communications software).
· Analog position feedback (optional) The position of the valve can be transmitted via an analog 4 20 mA output to the PLC (4 20 mA corresponds to 0 100 %).

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Type 8694 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.

6.3 Licenses
The product is approved for use in zone 2 and 22 in accordance with ATEX directive 2014/34/EU category 3GD.
Observe instructions on operation in an explosion-risk (Ex) area. Observe the ATEX additional instructions. The product is cULus approved. Instructions for use in the UL area see chapter “6.8 Electrical data”.

6.4 Operating conditions
WARNING! Solar radiation and temperature fluctuations may cause malfunctions or leaks. If the device is used outdoors, do not expose it unprotected to the weather conditions. Ensure that the permitted ambient temperature does not exceed the maximum value or drop below the mini-
mum value.

Ambient temperature Degree of protection

see type label

Evaluated by the manufacturer:

Evaluated by UL:

IP65 / IP67 according to EN 60529 UL Type 4x Rating

Operating altitude

up to 2000 m above sea level

Only if cables, plugs and sockets have been connected correctly and in compliance with the exhaust air concept see chapter “9 Pneumatic installation”.

6.5 Mechanical data

Dimensions Body material

See data sheet exterior: PPS, PC, VA, interior: PA 6; ABS

Sealing material

EPDM / (NBR)

20 Stroke range of valve spindle:

2 45 mm

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Type 8694 Technical data

6.6 Pneumatic data

Control medium
Dust content Quality class 7 Water content Quality class 3
Oil content Quality class X Temperature range of the control medium Pressure range of the control medium Air output of pilot valve
Connections

neutral gases, air Quality classes in accordance with ISO 8573-1 max. particle size 40 µm, max. particle density 10 mg/m³ max. pressure dew point – 20 °C or min. 10 °C below the lowest operating temperature max. 25 mg/m³
-10 +50 °C
3 7 bar 7 lN / min (for aeration and deaeration) (QNn – value according to definition for pressure drop from 7 to 6 bar absolute) optional: 130 lN / min (for aeration and deaeration) (only single-acting) Plug-in hose connector Ø6 mm / 1/4″ Socket connection G1/8

6.7 Type labels

6.7.1
Example:

Type label standard

Supply voltage / Control

Type

D-74653 Ingelfingen

8694 24 V DC

single act Pilot 0,6

Pmax 7bar

Tamb 0°C – +60°C

S/N 001000

00185134 W14UN

Identification number

Figure 7: Example of type label

Control function – Pilot valve Max. operating pressure Max. ambient temperature
Serial number – CE mark Bar-code

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Type 8694 Technical data

6.7.2
Example:

UL type label

D-74653 Ingelfingen

Type; Features of the type code applicable to UL and ATEX

8694 -E3-…-0

PU02

Single act Pilot 3.0 24V

Pmax 7 bar

Tamb -10 – +55 °C

S/N 1001

00123456

W15MA

Control function; pilot valve; Supply voltage pilot valve
Max. operating pressure Max. ambient temperature Serial number; CE mark Identification number; Date of manufacture (encoded) Bar code

Figure 8: UL type label (example)

6.7.3
Example:

UL additional label

Degree of protection Circuit with limited power
Supply voltage device

Type 4X enclosure NEC Class 2 only Supply voltage: 24V

Figure 9: UL additional label (example)

6.8 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 bus control 24 V DC

Protection class Connections
Control valve Operating voltage Power input
Input resistance for set-point value signal 22

3 as per DIN EN 61140 (VDE 0140-1) Cable gland M16 x 1.5, wrench size 22 (clamping area 5 10 mm) with screw-type terminals for cable cross-sections 0.14 1.5 mm² Circular plug-in connector (M12 x 1, 8-pole)
24 V DC ± 10% – max. residual ripple 10 % 3.5 W
75 at 0/4 – 20 mA / 12 bit resolution

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Type 8694 Technical data

Analogue position feedback max. load for current output 0/4 20 mA Binary input
Communications interface

560
0 5 V = log “0”, 12 – 30 V = log “1” inverted input in reverse order
Direct connection to PC via USB adapter with integrated interface driver, communication with communications software, see “Table 34: Accessories”.

6.8.2 Electrical data with AS-Interface bus control

Protection class Connections Electrical supply voltage

3 as per DIN EN 61140 (VDE 0140-1) Circular plug-in connector (M12 x 1, 4-pole) 29.5 V 31.6 V DC (according to specification)

Devices without external supply voltage:

Max. power consumption

150 mA

Devices with external supply voltage:

External supply voltage

24 V ± 10 %

The power supply unit must

include a secure disconnection in

accordance with IEC 364-4-41

(PELV or SELV)

Max. power consumption

100 mA

Max. power consumption from AS-Interface

50 mA

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Type 8694 Technical data

6.9 Factory settings of the positioner
Functions can be activated via DIP switches:

Function

Parameter

Value

CUTOFF CHARACT

Sealing function below Sealing function above
Select characteristic

2 % 98 %
FREE5)

DIR.CMD

Effective direction set-point value

rise

Table 4:

Factory settings – Functions I

Functions can be activated via communications software:

Function

Parameter

Value

INPUT

Set-point value input

4 … 20 mA

DIR.ACTUATOR

Effective direction actual value

rise

SPLITRANGE Function deactivated
X.LIMIT Function deactivated
X.TIME Function deactivated

Signal split range below Signal split range above
Stroke limit below Stroke limit above
Actuating time Open Actuating time Closed

X.CONTROL

Deadband Open amplification factor Close amplification factor

SAFE POSITION

Safety position

0 % 100 %
0 % 100 %
(1 s) values determined by X.TUNE (1 s) values determined by X.TUNE After implementation of RESET: 1 s
1,0 % (1) values determined by X.TUNE (1) values determined by X.TUNE After implementation of RESET: 1
0 %

SIGNAL ERROR Function deactivated

Sensor break detection set-point value

BINARY INPUT

Binary input function Operating principle of binary input

OUTPUT (optional)
Table 5:

Norm signal output: Parameter Norm signal output: Type
Factory settings Functions II

OFF
Safety position Normally open Position 4 20 mA

Without change to the settings via the communications software a linear characteristic is stored in FREE. 24

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Type 8694 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 “12 Start-up”.

7.1 Operating status
AUTOMATIC (AUTO) Normal controller mode is implemented and monitored in AUTOMATIC operating status.
LED 1 flashes green. MANUAL In MANUAL operating status the valve can be opened and closed manually via the keys.
LED 1 flashes red / green alternately. DIP switch 4 can be used to switch between the two operating statuses AUTOMATIC and MANUAL.
ON DIP
1234

7.2 Control and display elements of the positioner

Version 1 LED 1

LED 2

Key 1

Version 2

LED 1

Communications interface

Key 2 LED 2

DIP Switches

ON DIP

Communications

1234

interface

Key 1 Key 2
Figure 10: Description of control elements 25

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Type 8694 Control and display elements

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 process valve but the connection housing.

To operate the buttons and DIP switches, for

Version 1:

unscrew the body casing

Version 2:

unscrew the transparent cap

Transparent cap Body casing

Connection housing

Figure 11:

Version 1 Open positioner

Actuator

Version 2

Body casing
Seal body casing Connection housing
Figure 12: Position of the seal in the body casing
Version 1:
Check that the seal is correctly positioned in the body casing. NOTE! 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.
Close the device (assembly tool: 6740776)).
6) The assembly tool (674077) is available from your Bürkert sales office. 26

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Type 8694 Control and display elements

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

Version 2

Key 1

Key 2

Key 1

Key 2

Figure 13: Description of the buttons
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 process valve but the connection housing.

To operate the buttons, for

Version 1:

unscrew the body casing

Version 2:

unscrew the transparent cap

Transparent cap Body casing Connection housing

Figure 14:

Version 1 Open positioner

Actuator

Version 2

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MANUAL operating status (DIP switch 4 set to ON):

Key 1 2 Table 6:

Function
Aerate7) (manually open / close the actuator)8) Deaerate7) (manually open / close the actuator)8) Configuration of the keys for MANUAL operating status

AUTOMATIC operating status (DIP switch 4 set to OFF):

Key

Function

Press for 5 seconds to start the X.TUNE function

2 Table 7:

Configuration of the keys for AUTOMATIC operating status

Type 8694 Control and display elements

Body casing

Seal body casing
Connection housing

Figure 15: 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.
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.

Close the device (assembly tool: 6740779)).

No function if the binary input was activated with the “Manual/Auto change- over” via the communications software
Depending on the operating principle of the actuator.

The assembly tool (674077) is available from your Bürkert sales office.

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Type 8694 Control and display elements

7.4 Function of the DIP switches
ON DIP

1234

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 process valve but the connection housing.

To operate the DIP switches, for

Version 1:

unscrew the body casing

Version 2:

unscrew the transparent cap

Transparent cap Body casing

Connection housing

Figure 16:

Version 1 Open positioner

Actuator

Version 2

DIP Switches Position

OFF

Function
Reversal of the effective direction of the set-point value (DIR.CMD) (set- point value 20 4 mA corresponds to position 0 100 %), descending Normal effective direction of the set-point value (set-point value 4 20 mA corresponds to position 0 100 %), ascending Sealing function active. The valve completely closes below 2 %10) and opens above 98 % of the set-point value (CUTOFF) No sealing function

OFF

Correction characteristic for adjustment of the operating characteristic (linearization of the process characteristic CHARACT) 11)
Linear characteristic

Operating status MANUAL (BY HAND)

OFF

Operating status AUTOMATIC (AUTO)

Table 8:

DIP Switches

Factory setting, can be changed via communications software. 11) The characteristic type can be changed via communications software.
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Type 8694 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 Connection housing
Figure 17: 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. 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.
Close the device (assembly tool: 67407712)).

The assembly tool (674077) is available from your Bürkert sales office. 30

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Type 8694 Control and display elements

7.5 Display of the LEDs

Version 1 LED 1

LED 2

LED 1
(green / red)

Display of mode statuses AUTO, MANUAL, X.TUNE and FAULT

Version 2

LED 2
(green / yellow)

Display of the actuator status (open, closed, opens or closes)

Figure 18: LED display

LED 1 (green / red)

LED statuses

green

red

off

Display Acceleration phase when Power ON

flashes slowly

off

flashing

alternating

flashes quickly

off

flashes slowly

Table 9:

Display LED 1

Operating status AUTO (AUTOMATIC) MANUAL operating status
X.TUNE function ERROR (see chapter entitled “7.6 Error messages”) AUTO operating status for sensor break detection

LED 2 (green / yellow)

LED statuses

green

yellow

off

Display Actuator closed

off flashes slowly
off flashes quickly

on off flashes slowly off

Actuator open
remaining control deviation (actual value > set-point value) remaining control deviation (actual value < set-point value)
Closing in MANUAL operating status

off

flashes quickly Opening in MANUAL operating status

Table 10: Display LED 2

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Type 8694 Control and display elements

7.6 Error messages
7.6.1 Error messages in MANUAL and AUTOMATIC operating statuses

Display

Cause of fault

Remedial action

LED 1 (red) on

Checksum error in data memory

Not possible, device defective

Data memory defective

The device automatically switches to an older (possibly not current) data record.

Table 11: Error messages in the operating statuses

7.6.2 Error messages while the X.TUNE function is running

Display

Cause of fault

LED 1 (red) on

No compressed air connected
Compressed air failure while the X.TUNE function was running Actuator or control system deaeration side leaking Control system aeration side leaking

Table 12: Error messages for the X.TUNE function

Remedial action Connect compressed air Check compressed air supply Not possible, device defective Not possible, device defective

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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. Observe applicable accident prevention and safety regulations for electrical equipment.
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 assembly, ensure a controlled restart.
8.2 Installation of the positioner Type 8694 on process valves of series 2103, 2300 and 2301
NOTE! When mounting on process valves with a welded body, follow the installation instructions in the operating instructions for the process valve. Procedure:
1. Install switch spindle
Transparent cap

Pilot air ports (plug-in hose connectors with collets or
threaded bushings)
Actuator

Figure 19: Installation of the switch spindle (1), series 2103, 2300 and 2301

Unscrew the transparent cap on the actuator and unscrew the position display (yellow cap) on the spindle

extension (if present).

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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
Figure 20: Installation of the switch spindle (2), series 2103, 2300 and 2301
NOTE! 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.
Push the switch spindle through the guide element.
NOTE! Screw locking paint may contaminate the groove ring. Do not apply any screw locking paint to the switch spindle.
To secure the switch spindle, apply some screw locking paint (Loctite 290) in the tapped bore of the spindle
extension in the actuator.
Check that the O-ring is correctly positioned. Screw the guide element to the actuator cover (maximum torque: 5 Nm). Screw switch spindle onto the spindle extension. To do this, there is a slot on the upper side
(maximum torque: 1 Nm).
Push puck onto the switch spindle and lock into position.
34

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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.

Pilot air port
Caution: collets must not be
fitted !

Form seal
Installation of the form seal

Figure 21: Installation of the sealing rings, series 2103, 2300 and 2301 3. Install positioner
Align the puck and the positioner until
1. the puck can be inserted into the guide rail of the positioner (see “Figure 22”) and 2. the connection pieces of the positioner can be inserted into the pilot air ports of the actuator (see also
“Figure 23”).
NOTE! Damaged printed circuit board or malfunction. Ensure that the puck is situated flat on the guide rail.
Guide rail
Puck

Figure 22: Aligning the puck

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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.
Attach the positioner to the actuator using the two side fastening screws. In doing so, tighten the screws only
hand-tight (max. torque: 1.5 Nm).

Connection pieces
Pilot air ports

Fastening screws max. 1.5 Nm

Actuator Figure 23: Installation of positioner, series 2103, 2300 and 2301

8.3 Installing the positioner Type 8694 on process valves belonging to series 26xx and 27xx
Procedure: 1. Install switch spindle
Guide element Spindle extension

Actuator

Figure 24: Installing the switch spindle (1), series 26xx and 27xx
Unscrew the already fitted guide element from the actuator (if present). 36 Remove intermediate ring (if present).

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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. To do this, apply some screw locking paint (Loctite 290) in the tapped bore of the spindle extension.
Screw the guide element into the cover of the actuator using a face wrench13) (torque: 8.0 Nm). To secure the switch spindle, apply some screw locking paint (Loctite 290) to the thread of the switch spindle. Screw the switch spindle onto the spindle extension. To do this, there is a slot on the upper side
(maximum torque: 1 Nm).
Push the puck onto the switch spindle until it engages.

Journal Ø: 3 mm; journal gap: 23.5 mm

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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.
Guide rail
Puck
Figure 26: Aligning the puck
Press the positioner all the way down as far as the actuator and turn it into the required position.

Fastening screws max. 1.5 Nm
Figure 27: Installing the positioner
Ensure that the pneumatic connections of the positioner and those of the valve actuator are situated preferably vertically one above the other. If they are positioned differently, longer hoses may be required other than those supplied in the accessory kit.
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.
Attach the positioner to the actuator using the two side fastening screws. In doing so, tighten the fastening
screws hand-tight only (maximum torque: 1.5 Nm). 38

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Type 8694 Installation
3. Install pneumatic connection between positioner and actuator
Pilot air outlet 21 Pilot air outlet 22

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.
Using the hoses supplied in the accessory kit, make the pneumatic connection between the positioner and
actuator with the following “Table 13: Pneumatic connection to actuator – CFA” or “Table 14: Pneumatic connection to actuator – CFB”.
NOTE! Damage or malfunction due to ingress of dirt and moisture.
To observe degree of protection IP65 / IP67:
In the case of actuator size 80, 100 connect the pilot air outlet which is not required to the free pilot air port of the actuator or seal with a plug.
In the case of actuator size 125 seal the pilot air outlet 22 which is not required with a plug and feed the free pilot air port of the actuator via a hose into a dry environment.

Control function A (CFA) Process valve closed in rest position (by spring force)
Actuator size

Actuator Positioner

Pilot air outlet

Upper pilot air port
Lower pilot air port Dry area Table 13: Pneumatic connection to actuator – CFA

80, 100

125

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Type 8694 Installation

Control function B (CFB) Process valve open in rest position (by spring force)
Actuator size

Actuator Positioner

Pilot air outlet

Upper pilot air port Lower pilot air port Dry area Table 14: Pneumatic connection to actuator – CFB

80, 100

125

“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.
The position of the connections can be aligned steplessly by rotating the actuator module (positioner and actuator) through 360°.
Process valves Type 2300, 2301 and 27xx: Only the entire actuator module can be rotated. The positioner cannot be rotated contrary to the actuator. The process valve must be in the open position for alignment of the actuator module.
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.
Procedure:
Clamp valve body in a holding device (only required if the process valve has not yet been installed). NOTE!
Damage to the seat seal or the seat contour. When removing the actuator module, ensure that the valve is in open position.
Control function A: Open process valve.
40

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Type 8694 Installation

Key contour Nipple

Actuator module

Hexagon Nipple

without hexagon

with 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 key14) exactly in the key contour on the underside of the actuator.
Actuator module with hexagon:
Place suitable open-end wrench on the hexagon of the actuator.

WARNING! Risk of injury from discharge of medium and pressure. If the direction of rotation is wrong, the body interface may become detached. Rotate the actuator module in the specified direction only (see “Figure 30”) .

Actuator module without hexagon:
Rotate clockwise (as seen from below) to bring the actuator module into the required position.
Actuator module with hexagon:
Rotate counter-clockwise (as seen from below) to bring the actuator module into the required position.

Open-end wrench Special key

Figure 30:

with hexagon Rotating with special key / open-end wrench

without hexagon

The special key (665702) is available from your Bürkert sales office. 41

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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) Pneumatic connection

Positioner Actuator

Figure 31: Rotating the positioner, series 26xx and 27xx
Procedure
Loosen the pneumatic connection between the positioner and the actuator. Loosen the fastening screws (hexagon socket wrench size 2.5). Rotate the positioner into the required position.
NOTE! Too high torque when screwing in the fastening screw does not ensure degree of protection IP65 / IP67. The fastening screw may be tightened to a maximum torque of 1.5 Nm only.
Tighten the fastening screws hand-tight only (maximum torque: 1.5 Nm). Re- attach the pneumatic connections between the positioner and the actuator. If required, use longer hoses.

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Type 8694 Pneumatic installation

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. Following installation, ensure a controlled restart.
Procedure:
Connect the control medium to the pilot air port (1) (3 7 bar; instrument air, free of oil, water and dust). Attach the exhaust air line or a silencer to the exhaust air port (3)
and, if available to the exhaust air port (3.1)
Important information for the problem-free functioning of the device: The installation must not cause back pressure to build up. Select a hose for the connection with an adequate cross-section. The exhaust air line must be designed in such a way that no water or other liquid can get into the device
through the exhaust air port (3) or (3.1).

Figure 32:

Pilot air port (label: 1)
Exhaust air port (label: 3)
Pneumatic connection

Additional exhaust air port (label: 3.1) only for Type 23xx and 2103 with pilot-operated control system for high air flow rate (actuator size ø 130)

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Type 8694 Pneumatic installation

Caution:(Exhaust air concept): In compliance with degree of protection IP67, an exhaust air line must be installed in the dry area.
Keep the adjacent supply pressure always at least 0.5 1 bar above the pressure which is required to move the actuator to its end position. This ensures that the control behavior is not extremely negatively affected in the upper stroke range on account of too little pressure difference.
During operation keep the fluctuations of the pressure supply as low as possible (max. ±10 %). If fluctuations are greater, the control parameters measured with the X.TUNE function are not optimum.

9.1 Manual actuation of the actuator via pilot valves

9.1.1 Single-acting actuators (control function A and B)
The actuator can be moved without a power supply from the rest position to its end position and back again. To do this, the pilot valves must be actuated with a screwdriver.
NOTE! The hand lever may be damaged if it is simultaneously pressed and turned. Do not press the hand lever when turning it.

Pilot valve non activated (normal position)
Hand lever to the left

Pilot valve for aerate
Pilot valve for deaerate

Pilot valve activated
Hand lever to the right

Type 8694 for high air flow rate
Pilot valve for aerate Pilot valve for deaerate

Figure 33: Pilot valves for aerate and deaerate the actuator 44

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Type 8694 Pneumatic installation

Move actuator to end position

Turn the hand levers to the right using a screwdriver.

Note:

– do not press the hand levers when turning them – observe the sequence as described below

1. Actuate hand lever pilot valve deaeration.

2. Actuate hand lever pilot valve aeration.

Both hand levers point to the right. The actuator moves to the end position.

1. 2.
Type 8694 for high air flow rate
2. 1.

Figure 34: Move actuator to end position

Move actuator back to the rest position

Turn the hand levers to the left using a screwdriver.

Note:

– do not press the hand levers when turning them – observe the sequence as described below

1. Actuate hand lever pilot valve aeration.

2. Actuate hand lever pilot valve deaeration.

Both hand levers point to the left (normal position). The actuator moves by spring force to the rest position.

2. 1.
Type 8694 for high air flow rate
1. 2.

Figure 35: Move actuator back to the rest position
Caution: If the pilot valves are actuated, electrical control is not possible. Move hand levers to normal position before starting up the device.
45

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Type 8694 Electrical installation 24 V DC

10 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
· Multi-pole with circular plug-in connector M12 x 1, 8-pole

10.1 Safety instructions
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.
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.
10.2 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
Figure 36: Circular plug M12 x 1, 8-pole 46

5 6
7
8 1

Circular plug 4 M12 x1, 8-pole
3
2

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Type 8694 Electrical installation 24 V DC

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

Pin Wire color15) Configuration

1 white

Set-point value + (0/4 20 mA)

External circuit / signal level

+ (0/4 … 20 mA)

2 brown 5 grey

Set-point value GND Binary input +

GND

6 pink

Binary input GND

identical to Pin 3 (GND)

Table 15: Pin assignment – input signals of the control center – circular plug M12 x 1, 8-pole

0 … 5 V (log. 0) 10 … 30 V (log. 1)

Output signals to the control center (e.g. PLC) – circular plug M 12 x 1, 8-pole (required for analogue output option only)

Pin Wire color15) Configuration

8 red

Analogue position feedback +

External circuit / signal level

+ (0/4 … 20 mA)

7 blue

Analogue position feedback GND 7

GND

Table 16: Pin assignment – output signals of the control center – circular plug M12 x 1, 8-pole

Operating voltage (circular plug M12 x 1, 8-pole)

Pin Wire color15) Configuration

4 yellow

+ 24 V

External circuit 4

3 green

GND

Table 17: Pin assignment – operating voltage (circular plug M12 x 1, 8-pole)

24 V DC ± 10 % max. residual ripple 10 %

When the supply voltage is applied, the positioner is operating.
Make the required basic settings and actuate the automatic adjustment of the positioner, as described in the
chapter entitled “12 Start-up”.

The indicated colors refer to the connecting cable available as an accessory (919061) 47

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Type 8694 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.
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 screw-type terminals can be accessed by unscrewing the body casing (stainless steel).
Transparent cap Body casing Connection housing

Figure 37: Open positioner

Actuator

Push the cables through the cable gland.

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Type 8694 Electrical installation 24 V DC

1 216)
316) 4 5 6 7

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

Set-point value +

External circuit 4

+ (0/4 … 20 mA)

Set-point value GND

Binary input +

GND

0 … 5 V (log. 0)

with reference to terminal 7 (GND) 10 … 30 V (log. 1)

Table 18: Assignment of screw-type terminals – input signals of the control center – cable gland

Output signals to the control center (e.g. PLC; for analog output option only)

Terminal Configuration

Analogue position feedback +

External circuit 2

+ (0/4 … 20 mA)

3 Table 19:

Analogue position feedback GND

GND

Assignment of screw-type terminals – output signals to the control center – cable gland

Operating voltage

Terminal Configuration

External circuit

Operating voltage +

7 Table 20:

Operating voltage GND

Assignment of screw-type terminals – operating voltage – cable gland

24 V DC ± 10 % max. residual ripple 10 %

Option only 49

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Type 8694 Electrical installation 24 V DC
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. Damage or malfunction due to penetration of dirt and humidity. To ensure degree of protection IP65 / IP67: Tighten the union nut on the cable gland according to the cable size or dummy plugs used (approx. 1.5 Nm). Screw the body casing in all the way.
Tighten union nut on the cable gland (torque approx. 1.5 Nm). Close the device (assembly tool: 67407717)).
When the power supply is applied, the positioner is operating.
Make the required basic settings and actuate the automatic adjustment of the positioner, as described in the
chapter entitled “12 Start-up”.

The assembly tool (674077) is available from your Bürkert sales office. 50

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Type 8694 AS-Interface installation

11 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.
Network topology Freely selectable within wide limits, i.e. star, tree and line networks are possible. Further details are described in the AS-Interface specification (A/B slave model conforms to the version 3.0 specification).

11.2 Maximum length of the bus line
The bus line may have a maximum length of 100 m. During the design phase, consider all AS-Interface lines in an AS-Interface section, i.e. even the stub lines to the individual slaves.
The development stage which is actually possible depends on the sum of all the individual operating currents per positioner which are supplied on a common AS-Interface bus segment via the bus.
· Observe the maximum power supply 8 A via certified AS-Interface power supply units. Details see AS-Interface specification.
· Note the optional model “AS-Interface with external power supply” to relieve the AS-Interface bus segment (see “11.7.2”).
· Use cables according to the AS-Interface specification. If other cables are used, the maximum bus line length will change.

11.3 Technical data for AS-Interface PCBs

Version Profile S-7.3.4

Supply

via AS-Interface

Outputs

16 bit set-point value

Inputs

–

Certification

Certificate no. 87301 after version 3.0

Table 21: Technical data

Version Profile S-7.A.5 via AS-Interface 16 bit set-point value 16 bit feedback Certificate no. xxxxx after version 3.0

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Type 8694 AS-Interface installation

11.4 Programming data

Version Profile S-7.3.4

Version Profile S-7.A.5

I/O configuration

7 hex

ID code Extended ID code 1 Extended ID code 2

3 hex (analog profile)
F hex (Default value, can be changed by the user)
4 hex

A hex 7 hex 5 hex

Profile

S-7.3.4

S-7.A.5

Table 22: Programming data

Bit configuration
1. Output set-point value (Value range 0 10.000, is equivalent to 0 100 %)
2. Input feedback18) (Value range 0 10.000 (16 Bit, signed integer), is equivalent to 0 100 %) Values below 0 (0.0 %) and above 10,000 (100.0 %) are possible due to mechanical tolerances. Example: Position -1.0 % corresponds to -100 = 0xFF9C

Byte 2

Byte 1

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Parameter bit Output

P3 not used

Table 23: Bit configuration

P2 not used

P1 not used

P0 not used

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Type 8694 AS-Interface installation

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: 1. Byte: Code = 16 dez 2. Byte: Index = 0 dez 3. Byte: Length = 5 dez

S-7.A.5 slave replies with 6 bytes

1. Byte: Code

= 80 dez

2. Byte: Vendor ID (high) 3. Byte: Vendor ID (low)

= 120 dez

4. Byte: Device ID (high) = 1 dez
5. Byte: Device ID (low)

6. Byte: 1 word output + 1 word input

= 34 dez

or with 2 Byte (Read Response not OK)

1. Byte: Code

= 144 dez

2. Byte: Error Code

= 0 dez (no error) 1 dez (illegal index) 2 dez (illegal length) 3 dez (request not implemented) 4 dez (busy)

2. Then the following cyclical commands can be used:
Code = 0 (get cyclic data from Slave) for feedback 0 100 %
Code = 1 (put cyclic data to slave) for set-point value 0 100 %

Only for version with S-7.A.5 profile

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Type 8694 AS-Interface installation
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). Bus LED green Bus LED red

Figure 40: LED status display AS-Interface

LED green LED red

off

POWER OFF

off

No data traffic (expired Watch Dog at slave address does not equal 0)

off

flashing

Slave address equals 0

off

flashing

Electronic error or external reset

flashing

Timeout bus communication after 100 ms (periphery error)

Table 24: LED Status Display AS-Interface

Body casing
Seal body casing Connection housing
54 Figure 41: Position of the seal in the body casing

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Type 8694 AS-Interface installation
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. To observe degree of protection IP65 / IP67, screw the transparent cap in all the way.
Close the device (assembly tool: 67407719)).
19) The assembly tool (674077) is available from your Bürkert sales office.
11.7 Electrical installation AS-interface
11.7.1 Safety instructions 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.
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.

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Type 8694 AS-Interface installation

11.7.2 Connection with circular plug-in connector M12 x 1, 4-pole, male

It is not necessary to open the positioner for the multi-pole model.

Bus connection without external / with external supply voltage

Pin Designation

Configuration

Bus +

AS-Interface bus line +

NC or GND (optional)

not used or external supply voltage (optional)

Bus

AS-Interface bus line –

NC or 24 V + (optional) not used or external supply voltage + (optional)

Table 25: Pin assignment of circular plug-in connector for AS-Interface

Views of plug: From the front onto the pins, the soldered connections are behind

Pin 4: NC

Pin 3: Bus

Pin 4: 24 V +

Pin 3: Bus

Pin 1:

Pin 2:

Pin 1:

Pin 2:

Bus +

GND

Figure 42: Bus connection without external supply voltage

Figure 43:

When the supply voltage is applied, the positioner is operating.

Bus connection with external supply voltage (optional)

Make the required basic settings and actuate the automatic adjustment of the positioner, as described in the
chapter entitled “12 Start-up”.

11.7.3 Connection with multi-pole cable and ribbon cable terminal
As an alternative to the bus connection model with 4-pole circular plug, there is the positioner with multi-pole cable (M12 circular plug) and ribbon cable terminal. The wiring diagram of the circular plug corresponds to the bus connection 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

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Type 8694 AS-Interface installation

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.
100 m 62 x 1.0 m = 38 m
If the calculated bus line length of 100 m is exceeded, a commercially available AS-Interface repeater can be used.

Handling the ribbon cable terminal
The multi-pole cable features a ribbon cable terminal – with M12 plug-in connector branch circuit – for AS-Interface flat cable. The ribbon cable terminal contacts the AS-Interface flat cable by means of penetration technology which allows installation by “clipping in” the AS-Interface flat cable without cutting and without removing insulation.

Screws M12 plug-in connector branch circuit
Figure 45: Ribbon cable terminal

Work steps:
Open the ribbon cable terminal
(loosen screws and remove cover)
Insert flat cable conclusively
Close ribbon cable terminal again
Tighten screws
Slightly undo thread-forming screws (approx. 3/4 turn to the left) and position them on the existing tapped bore and screw in.

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Type 8694 Start-up

12 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. Before start-up, ensure that the operating personnel are familiar with and completely understand the contents
of the operating instructions. Observe the safety instructions and intended use. Only adequately trained personnel may operate the equipment/the device.
12.2 Specifying the standard settings
The basic settings of the positioner are implemented at the factory.
To adjust the positioner to local conditions, the X.TUNE function must be run following installation.
12.2.1 Running the automatic adjustment X.TUNE
WARNING! Danger due to the valve position changing when the X.TUNE function is running. When the X.TUNE is running under operating pressure, there is an acute risk of injury. Never run X.TUNE while a process is running. Take appropriate measures to prevent the equipment from being accidentally actuated. NOTE! Avoid maladjustment of the controller due to an incorrect pilot pressure or applied operating medium pressure. Run X.TUNE whenever the pilot pressure (= pneumatic auxiliary energy) is available during subsequent operation. Run the X.TUNE function preferably without operating medium pressure to exclude interference caused by
flow forces.
To run X.TUNE, the positioner must be in the AUTOMATIC operating status (DIP switch 4 = OFF).
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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 process valve but the connection housing.

To operate the DIP switches, for

Version 1:

unscrew the body casing

Version 2:

unscrew the transparent cap

Transparent cap Body casing

Connection housing

Figure 46:

Version 1 Open positioner

Actuator

Version 2

Version 1

LED 1 LED 2 Key 2

LED 1

Key 1

LED 2

DIP Switches

Communications interface
Key 1 Key 2
Figure 47: Automatic adjustment X.TUNE
Start the X.TUNE by pressing button 120) for 5 s.

Communications interface Version 2
ON DIP 12 3 4

While the X.TUNE is running, LED 1 flashes quickly (green). When the automatic adjustment is complete, LED 1 flashes slowly (green)21).
The changes are automatically transferred to the memory (EEPROM) provided the X.TUNE function is successful.

Important: When the X.TUNE function is activated, the actuator cannot be actuated via the AS-Interface communication.

The X.TUNE can also be started via communications software. 21) If a fault occurs, LED 1 is lit red.
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Type 8694 Start-up

Body casing

Figure 48:

Position of the seal in the body casing

Seal body casing
Connection housing

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.
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.
Close the device (assembly tool: 67407722)).

The assembly tool (674077) is available from your Bürkert sales office. 60

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Type 8694 Operation and function

13 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).

Function

Description

DIP Switches OFF

DIR.CMD

Effective direction between input signal and set-point position

CUTOFF

Sealing function for position controller

CHARACT

Selection of the Transfer Characteristic between Input Signal and Stroke (Correction Characteristic)

Table 26: Basic functions of DIP switches

rise

fall

Sealing function off Sealing function on

Linear characteristic Correction

characteristic

The following basic function can be changed via the communications software only.

Function Description

Factory setting

INPUT RESET

Entry of the standard signal input for the set-point value
Reset to factory settings

4 20 mA

X.TUNE Table 27:

Automatic adjustment of the positioner to the relevant operating conditions
Basic function of communications software

The INPUT, CUTOFF and CHARACT functions can be parameterized via the communications software.

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Type 8694 Operation and function

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

OFF

Table 28: DIP switch 1

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 20 mA corresponds to position 0 100 %), rise

The effective direction (DIR.CMD) can only be changed via DIP switch 1 in the positioner.

Nominal position
rise

Figure 49: DIR.CMD graph

fall
Input signal
(INPUT)

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Type 8694 Operation and function

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

OFF

Function
Sealing function active. The valve completely closes below 2 %23) and opens above 98 % of the set-point value (CUTOFF) No sealing function

Table 29: DIP switch 2 The communications software can be used to change the limits for the position set-point value as a percentage.

The switching position of the DIP switches in the positioner has priority over the communications software, i.e. settings of the sealing function (CUTOFF) which are modified via the communications software are only active if DIP switch 2 in the positioner is set to ON.

Valve stroke [%] Adjustable from 75 100 %

Adjustable from 0 25 % Figure 50: CUTOFF graph

Set-point value [%]

Factory setting can be changed via communications software. 63

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Type 8694 Operation and function

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.

Factory setting: DIP switch 3 set to OFF (linear)

DIP Switches Position

OFF

Function
Correction characteristic for adjustment of the operating characteristic (linearization of the process characteristic CHARACT) 24) Linear characteristic

Table 30: DIP switch 3
The switching position of the DIP switches in the positioner has priority over the communications software, i.e. settings of the correction characteristic (CHARACT) which are modified via the communications software are only active if DIP switch 3 in the positioner is set to ON.

Characteristics which can be selected via the communications software:

Characteristic

Description

linear 1 : 25 1 : 33 1 : 50 25 : 1 33 : 1 55 : 1 FREE Table 31:

Linear characteristic Equal percentage characteristic 1 : 25 Equal percentage characteristic 1 : 33 Equal percentage characteristic 1 : 50 Inversely equal percentage characteristic 25 : 1 Inversely equal percentage characteristic 33 : 1 Inversely equal percentage characteristic 55 : 1 User-defined characteristic, freely programmable via nodes Selection of characteristics

The characteristic type can be changed via the communications software only. 64

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Type 8694 Operation and function
The flow characteristic kV = f(s) indicates the flow-rate of a valve, expressed by the value kV 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 kV value changes dkV are assigned to equal stroke changes ds.
(dkV = nlin ds). In the case of an equal percentage characteristic, an equal percentage change of the kV value corresponds to a stroke change ds.
(dkV/kV = neqlprct ds). The operating characteristic Q = f(s) specifies the correlation between the volumetric flow Q in the installed valve and the stroke s. This characteristic has the properties of the pipelines, pumps and consumers. It therefore exhibits a form which differs from the flow characteristic.
Standardized valve stroke [%]

Figure 51: Characteristic

Position set-point value [%]

In the case of control tasks for closed-loop control systems it is usually particular demands which are placed on the course of the operating characteristic, e.g. linearity. For this reason it is occasionally necessary to correct the course of the operating characteristic in a suitable way. For this purpose the positioner features a transfer element which implements different characteristics. These are used to correct the operating characteristic.
Equal percentage characteristics 1:25, 1:33, 1:50, 25:1, 33:1, and 50:1 as well as a linear characteristic can be set. A characteristic can be freely programmed using nodes.

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Type 8694 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 [&]

100 90 80 70 60 50 40 30 20 10
0 10 20 30 40 50 60 70 80 90 100 4 20 mA 0 20 mA

Unit signal [%]

Figure 52: Example of a programmed characteristic

13.1.4 INPUT Enter the input signal
Under this menu option, enter the unit signal used for the set-point value. Factory setting: 4 20 mA

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Type 8694 Operation and function
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.
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. Take appropriate measures to prevent the system / positioner from being unintentionally actuated. NOTE! Avoid maladjustment of the controller due to an incorrect compressed air supply or applied operating medium pressure. Run X.TUNE whenever the compressed air supply (= pneumatic auxiliary energy) is available during subse-
quent operation. Run the X.TUNE function preferably without operating medium pressure to exclude interference caused by
flow forces.
To run X.TUNE, the positioner must be in the AUTOMATIC operating state (DIP switch 4 = OFF).
Set up TUNE / TUNE Functions. Start X.TUNE. To do this, click ,,Start X.TUNE” 2).
The progress of X.TUNE is shown in the communication software:
When the automatic adjustment completes, a message appears. The changes are automatically transferred to the positioner`s memory (EEPROM) after the X.TUNE function is successful.

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Type 8694 Operation and function

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 X.LIMIT

Signal split range; input signal as a % for which the valve runs through the entire stroke range.
Limit the mechanical stroke range

X.TIME

Limit the control speed

X.CONTROL

Parameterize the position controller

SAFE POSITION

Input the safety position

SIGNAL ERROR

Configuration of signal level fault detection

BINARY INPUT

Activation of the binary input

OUTPUT Table 32:

Configuration of the outputs (only with auxiliary board for analogue feedback signal or binary outputs)
Auxiliary functions

13.2.1 DIR.ACTUATOR 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: rise
Rise: Direct effective direction (deaerated 0 %; aerated 100 %) Case: Inverse effective direction (deaerated 100 %; aerated 0 %)

Actual position

increasing

deaerated

decreasing Aeration
aerated state

Figure 53: DIR.ACTUATOR graph 68

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Type 8694 Operation and function

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 %

Lower value split range: Upper value split range:

Input the minimum value of the input signal as a % Adjustment range: 0 75 %
Input the maximum value of the input signal as a % Adjustment range: 25 100 %

Use this function to limit the position set-point value range of the positioner by specifying a minimum and a maximum value. This makes it possible to divide a unit signal range that is used (4 20 mA, 0 20 mA) into several positioners (without or with overlapping). This allows several valves to be used alternately or, in the case of overlapping set-point value ranges, simultaneously as actuators.

To split a unit signal range into two set-point value ranges: Valve stroke [%]

Set-point value range Positioner 1

Set-point value range Positioner 2

Figure 54: SPLTRNG graph

Set-point value [mA] (INPUT)

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Type 8694 Operation and function

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 positions or actual positions greater than 100 % are shown.
Factory setting: Lower position limit = 0 %, upper position limit = 100 %

Adjustment ranges: Lower position limit: Upper position limit:

0 50 % of the entire stroke 50 100 % of the entire stroke

The minimum distance between the upper and lower stroke limit is 50 %. Therefore if one value is entered with a minimum distance of < 50 % the other value is adjusted automatically.

Limited stroke (%)

Physical stroke (%)

Unlimited stroke

Limited stroke

Adjustment range in MANUAL mode Control range in AUTOMATIC mode

Figure 55: X.LIMIT graph

Set-point value [mA] (INPUT)

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Type 8694 Operation and function
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 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.
Valve timeopen: Opening time for entire stroke (in seconds) Adjustment range: 1 60 seconds
Valve timeclose: Closing time for entire stroke (in seconds) Adjustment range: 1 60 seconds
Effect of limiting the opening speed when there is a jump in the set-point value Valve stroke [%]

Set-point value

Actual value

t Open
Figure 56: X.TIME graph

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Type 8694 Operation and function

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; i.e. X.LIMIT upper stroke limit – X.LIMIT lower stroke (see auxiliary function X.LIMIT). This function causes the controller to respond only beginning at a specific control difference. This function saves wear on the solenoid valves in the positioner and the pneumatic actuator.
If the auxiliary function X.CONTROL is in the main menu while X.TUNE (Autotune of the positioner) is running, the deadband is determined automatically depending on the friction behavior of the actuator drive. The value determined in this way is an approximate value. You can re-adjust it manually.

Xd1`

Position setpoint value

Control difference
Xd1

Position actual value
Figure 57: X.CONTROL graph

to the controller

Xd1

Xd1`

Dead band

Open/close amplification factor: Parameters for the positioner

Open amplification factor:

Amplification factor of the positioner (for closing the valve)

Close amplification factor:

Amplification factor of the positioner (for opening the valve)

13.2.6 SAFE POSITION Definition of the safe position
This function specifies the actuator safety position which is approached at defined signals.

The set safety position is only approached if there is a corresponding signal at the binary input (for configuration see BINARY INPUT) or if a signal error occurs (for configuration see SIGNAL ERROR). If the mechanical stroke range is limited with the X.LIMIT function, only safety positions within these limits can be approached. This function is executed in AUTOMATIC mode only.

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Type 8694 Operation and function

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 20 mA is selected, sensor break detection cannot be selected.
A signal error is indicated on the device by the red LED for “setpoint error detection” ON. Safety position for sensor break ON: The following configurations can occur with “safety position if setpoint error” ON: Active SAFE POSITION If a fault is detected, the drive moves to the lower SAFE POSITION set position. Inactive SAFE POSITION If a fault is detected, the drive moves to the end position which it would assume in the isolated state.
13.2.8 BINARY INPUT Activation of the binary input
This function activates the binary input. The following settings can be implemented for this: · Approach the safety position · Switching over the MANUAL/AUTOMATIC operating mode · Starting the function X.TUNE (standard valid since software version A.20, with rotary actuator valid since
software version A.02).
Safety position Approach the safety position. Active SAFE POSITION function the drive moves to the lower SAFE POSITION set position. Inactive SAFE POSITION The drive moves to the end position which it would assume in the isolated state.
Switch over the operating state to MANUAL or AUTOMATIC. Binary input = 0 AUTOMATIC operating state Binary input = 1 MANUAL operating state If switching over the operating mode is selected, you can no longer switch the operating mode with DIP switch 4
Starting the function X.TUNE Binary input = 1 Starting X.TUNE.
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Type 8694 Operation and function

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.

Standard signal output: parameter Standard signal output: type

Position

Output of the current position

Set-point value Output of the set-point value

4 20 mA 0 20 mA

Selection of the unit signal

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Type 8694 Safety end positions

14 SAFETY END POSITIONS

14.1 Safety end positions after failure of the electrical or pneumatic auxiliary power

Actuator system
up down

Designation
single-acting Control
function A

Safety end positions after failure of the auxiliary power

electrical

pneumatic

down

pilot-controlled control system:
down
direct-acting control system:
not defined

single-acting

up down

Control function B

Table 33: Safety end positions

pilot-controlled control system:
up up
direct-acting control system:
not defined

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Type 8694 Maintenance
15 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. 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. Following maintenance, ensure a controlled restart.

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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.

Quick connector
O-ring
Air intake filter
Figure 58: Service on the air intake filter
Procedure:
Unlock the quick connector by pressing the holding element and pulling out the air intake filter (if necessary,
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. Insert the air intake filter all the way into the quick connector.
DANGER! Risk of injury due to improper installation. Ensure that the air intake filter is installed correctly.
Check that the air intake filter is secure.
77

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Type 8694 Accessories

16 ACCESSORIES

Designation USB adapter for connection to a PC in conjunction with an extension cable Communicator Connection cable M12 x 1, 8-pole Assembly tool Table 34: Accessories

Order no. 227093 Information at www.burkert.com 919061 647077

16.1 Communications software
The PC operating program “Communicator” is designed for communication with the devices from the Bürkert positioner family (valid since serial number 20000).
A detailed description and precise schedule of the procedure for the installation and operation of the software can be found in the associated documentation.

16.1.1 USB interface
The PC requires an USB interface for communication with the positioners as well as an additional adapter with interface driver (see “Table 34: Accessories”). The data transfer must be according to HART specification.
16.1.2 Download
Download the software at: www.burkert.com

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Type 8694 Disassembly
17 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. 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. Risk of injury from unintentional activation of the system and an uncontrolled restart. Secure system from unintentional activation. Following disassembly, ensure a controlled restart.
17.2 Disassembly the positioner
Procedure: 1. Pneumatic connection
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.
Loosen the pneumatic connection. Series 20xx:
Loosen the pneumatic connection between positioner and actuator.

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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:
Loosen the circular plug-in connector.
Cable gland:
Open the positioner: unscrewing the body casing in an anticlockwise direction. Unscrew the screw terminals and pull out cables. Close the positioner.
3. Mechanical connection
Loosen the fastening screws. Remove the positioner upwards.
Positioner

Pneumatic connections
Actuator

Electrical connection circular plug-in connector
Fastening screws (2x)
Pneumatic connection to
the actuator
Actuator

Series 21xx Figure 59: Disassembly the positioner
80

Series 20xx

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Type 8694 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 the effects of heat and cold which could result in temperatures above or below the permitted storage
temperature.

STORAGE
NOTE! Incorrect storage may damage the device. Store the device in a dry and dust-free location. Storage temperature -20 +65°C.

DISPOSAL
Dispose of the device and packaging in an environmentally friendly manner. NOTE!
Damage to the environment caused by device components contaminated with media. Observe the relevant disposal and environmental protection regulations.
Observe national waste disposal regulations.

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Type 8694

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www.burkert.com

References

Read User Manual Online (PDF format)

Read User Manual Online (PDF format) >>

Download This Manual (PDF format)

Download this manual >>

burkert 8694 Positioner Top Control Basic User Manual

burkert 8694 Positioner Top Control Basic

Product Information:

Product Usage Instructions:

Operation and Function

OPERATING INSTRUCTIONS

AUTHORIZED USE

GENERAL INFORMATION

SYSTEM DESCRIPTION

TECHNICAL DATA

BINARY INPUT

PACKAGING AND TRANSPORT

References

Read User Manual Online (PDF format)

Download This Manual (PDF format)

burkert User Manuals

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