Burkert 8792 User manual
Operating Instructions
Positioner
Electropneumatic positioner
We reserve the right to make technical changes without notice.
Technische Änderungen vorbehalten.
Sous resérve de modification techniques.
© 2009 Bürkert Werke GmbH & Co. KG
Operating Instructions 0908/01_EN-en_00806089
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Ta b l e o f c o n T e n T s
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Contents
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Contents
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Contents
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co n T e n T s
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General Information
Safety 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.
Failure to observe these instructions may result in hazardous situations.
The operating instructions must be read and understood.•
Failure to observe the warning may result in a fatal or serious injury.•
Failure to observe the warning may result in serious injuries or death. •
Failure to observe this warning may result in a medium or minor injury. •
Failure to observe the warning may result in damage to the device or the equipment. •
indicates important additional information, tips and recommendations which are important for your safety
and the flawless functioning of the device.
refers to information in these operating instructions or in other documentation.
designates a procedure that must be carried out.
→
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General Information
Safety Instructions
The device is designed for the open-loop control and closed-loop control of media.
The device must not be exposed to direct sunlight.•
Pulsating direct voltage (rectified alternating voltage without smoothing) must not be used as power supply.•
During use observe the permitted data, the operating conditions and conditions of use specified in the con-•
tract documents and operating instructions, as described in chapter “System Description” - “Technical Data”
in this manual and in the valve manual for the respective pneumatically actuated valve.
The device may be used only in conjunction with third-party devices and components recommended and •
authorised by Bürkert.
In view of the wide range of possible application cases, check whether the positioner is suitable for the spe-•
cific application case and check this out if required.
Correct transportation, correct storage and installation and careful use and maintenance are essential for reli-•
able and faultless operation.
Use the positioner Type 8792 and Type 8793 only as intended.•
If exporting the system/device, observe any existing restrictions.
The positioners Type 8792 and Type 8793 must not be used in areas where there is a risk of explosion.•
Do not supply the medium connectors of the system with aggressive or flammable mediums.•
Do not supply the medium connectors with any liquids.•
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 housings. Do not paint the housing parts or screws.•
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General Information
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.
Before loosening the lines and valves, turn off the pressure and vent the lines.•
Before reaching into the device or the equipment,• switch off the power supply and secure to prevent
reactivation!
Observe applicable accident prevention and safety regulations for electrical equipment!•
Keep the device away from highly flammable substances and media and do not touch with bare hands.•
To prevent injury, ensure that:
That the system cannot be activated unintentionally.•
Installation and repair work may be carried out by authorised 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.•
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 61340-5-1 and 5-2 to minimise or avoid the possibility of •
damage caused by sudden electrostatic discharge!
Also ensure that you do not touch electronic components when the power supply voltage is present! •
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General Information
Safety Instructions
The positioners Type 8792 and Type 8793 were developed with due consideration given to the accepted
safety rules and are state-of-the-art. Nevertheless, dangerous situations may occur.
Failure to observe this operating manual and its operating instructions as well as unauthorized tampering
with the device release us from any liability and also invalidate the warranty covering the devices and
accessories!
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General Information
Safety Instructions
Check immediately upon receipt of the delivery that the contents are not damaged and that the type and scope
agree with the delivery note and packing list.
Generally the product package consists of:
positioner, type 8792 / 8793 and the associated operating instructions
We will provide you with attachment kits for push drives or swivel actuators as accessories.
For the multipole version of the positioners we will provide you with cable connectors as accessories.
If there are any discrepancies, please contact us immediately.
Contact address:
Bürkert Fluid Control Systems
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: [email protected]
Contact addresses can be found on the final pages of these operating instructions.
And also on the internet at:
www.burkert.com Bürkert Company Locations
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General Information
Safety Instructions
This document contains no promise of guarantee. Please refer to our general terms of sales and delivery. The war-
ranty is only valid if the positioners Type 8792 and Type 8793 are used as intended in accordance with the specified
application conditions.
The warranty extends only to defects in the positioners Type 8792 and Type 8793 and their components.
We accept no liability for any kind of collateral damage which could occur due to failure or malfunction of
the device.
Operation of the device can be locked via a freely selectable user code. In addition, there is a non-changeable master
code with which you can perform all operator control actions on the device. This 4-digit master code can be found
on the last pages of these operating instructions in the chapter entitled “Master code”.
If required, cut out the code and keep it separate from these operating instructions.
The operating instructions and data sheets for Type 8792 and Type 8793 can be found on the Internet at:
www.burkert.com Documentation Type 8792 or Type 8793
There is also complete documentation on CD. The complete operating instructions can be ordered by quoting the
following identification number: 804625
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General Information
Safety Instructions
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co n T e n T s
5.1.1. Features .....................................................................................................................................................16
5.1.2. Combination with valve types and mounting versions ....................................................................17
5.1.3. Overview of the mounting options.......................................................................................................18
5.2.1. Type 8792, positioner with position control function ......................................................................19
5.2.2. Type 8793, positioner with process control function .....................................................................19
6.2.1. Diagram illustrating single-acting actuator ........................................................................................21
10.3.1. Operating Conditions .............................................................................................................................33
10.3.2. Conformity .................................................................................................................................................33
10.3.3. Mechanical data .......................................................................................................................................33
10.3.4. Electrical data ...........................................................................................................................................33
10.3.5. Pneumatic data ........................................................................................................................................34
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Description of System
The positioner Type 8792 / 8793 is a digital, electro-pneumatic position controller for pneumatically actuated
proportional valves. The device incorporates the main function groups
- Position measuring system
- Electro-pneumatic control system
- Microprocessor electronics
The position measuring system measures the current positions of the proportional valve.
The microprocessor electronics continuously compare the current position (actual value) with a set-point position
value specified via the unit signal input and supplies the result to the position controller.
If there is a control difference, the electro-pneumatic control system corrects the actual position accordingly.
•
The positioner features either a position control function (Type 8792) or a process control function (Type 8793).
•
- internal high resolution conductive plastic potentiometer or
- external non-contact, non-wearing position measuring system (remote).
Microprocessor-controlled electronics •
for signal processing, control and valve control.
•
Operation of the device is controlled by four keys. The 128x64 dot matrix graphics display enables you to
display the set-point or actual value and to configure and parameterize via menu functions.
•
The control system consists of 2 solenoid valves and 4 diaphragm reinforcers. In single-acting actuators the
working connection 2 must be sealed with a threaded plug.
•
The feedback is implemented either via 2 proximity switches (initiators), via binary outputs or via an output (4 –
20 mA / 0 – 10 V).
When the valve reaches an upper or lower position, this position can be relayed e.g. to a PLC via binary outputs.
The operator can change the initiators or limit positions via control lugs.
•
Internal thread G1/4“
•
Multipole plug or cable gland
•
Plastic-coated aluminium housing with hinged cover and captive screws.
•
on push actuator according to NAMUR recommendation (DIN IEC 534 T6) or on swivel actuator according to
VDI/VDE 3845.
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Description of System
•
Remote version for DIN rail mounting or for mounting bracket
The positioner Types 8792 / 8793 can be mounted on different proportional valves. For example on valves with
piston, membrane or rotary actuator. The actuators can be single-acting or double-acting.
For single-acting actuators, only one chamber is aerated and deaerated during actuation. The generated •
pressure works against a spring. The piston moves until there is an equilibrium of forces between compressive
force and spring force. To do this, one of the two air connections must be sealed with a threaded plug.
For double-acting actuators the chambers on both sides of the piston are pressurised. In this case, one •
chamber is aerated when the other one is deaerated and vice versa. In this design, no spring is installed in the
actuator.
Two basic device versions are offered for the positioner Type 8792 / 8793; they differ in the attachment option
and in the position measuring system.
An internal position measuring system is used which is designed as a rotary potentiometer. The positioner is
attached directly to the actuator.
An external position measuring system (linear or rotative) via a digital interface. The positioner is attached to a wall
either with a DIN rail or with a mounting bracket (remote design).
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Description of System
Mounting on
swivel drive
Mounting with
mounting bracket
on a push actuator
Remote mounting
with mounting bracket
Remote mounting
with DIN rail
Overview of the mounting optionsTable 1:
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Description of System
The position of the actuator is regulated according to the position set-point value. The position set-point value is
specified by an external uniform signal (or via field bus).
The positioner Type 8793 also features a PID controller which, apart from actual position control, can also be
used to implement process control (e.g. level, pressure, flow rate, temperature) in the sense of a cascade control.
The positioner Type 8793 is operated with a 128 x 64 dot matrix graphics display and a keypad with 4 keys.
The positioner is linked to a control circuit. The position set-point value of the valve is calculated from the process
set-point value and the actual process value via the control parameters (PID controller). The process set-point
value can be set by an external signal.
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Description of System
The positioners Type 8792 and Type 8793 consist of the micro-processor controlled electronics, the position meas-
uring system and the control system.
The appliance is designed using three-wire technology. Operation of the positioner is controlled by four keys and a
128 x 64 dot matrix graphics display.
The pneumatic control system for single-acting and double-acting actuators consists of 2 solenoid valves.
Pressure-relief valve
Mechanical position indicator
Control module with display and keys
Working connection 2
(connection: A2)
Supply pressure connection 1.4 – 7 bar
(connection: P)
Working connection 1
(connection: A1)
Air exhaust connection/air exhaust filter
Internal position measuring system
Axle for position measuring system
Cable bushing
Electronic module
Control system
Fig. 1: Structure, positioner type 8792 / 8793
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