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Burkert 8793 User Manual

Type 8792, 8793
Electropneumatic positioner and process controller
Operating Instructions
We reserve the right to make technical changes without notice. Technische Änderungen vorbehalten. Sous resérve de modification techniques.
© 2009 - 2013 Bürkert Werke GmbH
Operating Instructions 1308/04_EN-en_00806089 / Original DE
Type 8792, 8793
Contents

Table of conTenTs

GENERAL INFORMATION AND SAFETY INSTRUCTIONS ....................................................................................................5
Operating instructions .........................................................................................................................................................6
1.
Authorized use ........................................................................................................................................................................7
2.
Basic safety instructions ....................................................................................................................................................8
3.
Use in the Ex area .................................................................................................................................................................9
4.
General information ...........................................................................................................................................................10
5.
DESCRIPTION OF SYSTEM ...................................................................................................................................................................11
Description and features of the Type 8792/8793 .............................................................................................13
6.
Structure ..................................................................................................................................................................................17
7.
Positioner Type 8792 ........................................................................................................................................................19
8.
Process controller Type 8793 .......................................................................................................................................23
9.
Interfaces of the positioner / process controller ..............................................................................................28
10.
Technical data .......................................................................................................................................................................29
11.
INSTALLATION ...............................................................................................................................................................................................35
Attachment and assembly .............................................................................................................................................37
12.
Fluid connection ..................................................................................................................................................................49
13.
Electrical connection - Circular plug-in connector version (multi-pole version) ..............................51
14.
Electrical connection - Terminal version for cable gland ..............................................................................56
15.
OPERATION .....................................................................................................................................................................................................61
Operating levels ...................................................................................................................................................................62
16.
Operating and display elements .................................................................................................................................63
17.
Operating states ..................................................................................................................................................................71
18.
Activating and deactivating auxiliary functions ...................................................................................................72
19.
Manually opening and closing the valve ................................................................................................................74
20.
START-UP ..........................................................................................................................................................................................................75
Start-up sequence ..............................................................................................................................................................76
21.
Safety instructions .............................................................................................................................................................76
22.
Basic setting of the device ............................................................................................................................................ 77
23.
english
Type 8792, 8793
Contents
24. Activation of the process controller ..........................................................................................................................82
Basic setting of the process controller ...................................................................................................................83
25.
AUXILIARY FUNCTIONS .......................................................................................................................................................................103
Configuring the auxiliary functions ........................................................................................................................105
26.
OPERATING STRUCTURE / FACTORY SETTINGS ............................................................................................................... 173
Operating structure and factory settings ............................................................................................................ 174
27.
PROFIBUS DP ............................................................................................................................................................................................. 189
Description of the PROFIBUS DP ........................................................................................................................... 190
28.
Electrical connections ...................................................................................................................................................192
29.
Start-up PROFIBUS DP ................................................................................................................................................ 197
30.
DEVICENET ................................................................................................................................................................................................... 205
Description .......................................................................................................................................................................... 207
31.
Electrical connections ...................................................................................................................................................211
32.
Start-up DeviceNet .......................................................................................................................................................... 217
33.
MAINTENANCE AND TROUBLESHOOTING ..............................................................................................................................229
Maintenance ....................................................................................................................................................................... 230
34.
Error messages and malfunctions ......................................................................................................................... 230
35.
PACKAGING, STORAGE, DISPOSAL ............................................................................................................................................ 235
Packaging and transport .............................................................................................................................................. 236
36.
Storage .................................................................................................................................................................................. 236
37.
Disposal ................................................................................................................................................................................ 236
38.
ADDITIONAL TECHNICAL INFORMATION .................................................................................................................................237
Selection criteria for continuous valves .............................................................................................................. 238
39.
Properties of PID Controllers .................................................................................................................................... 240
40.
Adjustment rules for PID Controllers .................................................................................................................... 245
41.
TABLES FOR CUSTOMER-SPECIFIC SETTINGS ..................................................................................................................249
Table for your settings on the positioner ............................................................................................................250
42.
Table for your settings on the process controller Type 8793 .................................................................. 251
43.
english
Type 8792, 8793

General information and safety instructions

conTenTs
1. OPERATING INSTRUCTIONS ........................................................................................................................................................6
Symbols ......................................................................................................................................................................................6
1.1.
Definition of the term “device” ........................................................................................................................................6
1.2.
AUTHORIZED USE .............................................................................................................................................................................7
2.
Restrictions ...............................................................................................................................................................................7
2.1.
BASIC SAFETY INSTRUCTIONS .................................................................................................................................................8
3.
USE IN THE EX AREA .......................................................................................................................................................................9
4.
Basic safety instructions for use in the Ex area ...................................................................................................9
4.1.
Safety instructions for the installation and maintenance of Ex devices ...............................................9
4.2.
GENERAL INFORMATION .............................................................................................................................................................10
5.
Scope of supply ...................................................................................................................................................................10
5.1.
Contact address ..................................................................................................................................................................10
5.2.
Warranty ...................................................................................................................................................................................10
5.3.
Master code ...........................................................................................................................................................................10
5.4.
Information on the internet ............................................................................................................................................10
5.5.
english
Type 8792, 8793Type 8792, 8793
General Information Safety Instructions

1. 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.
WARNING!
The operating instructions contain important safety information!
Failure to observe these instructions may result in hazardous situations.
• The operating instructions must be read and understood.

1.1. Symbols

DANGER!
Warns of an immediate danger!
• Failure to observe the warning may 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 medium 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 a procedure that must be carried out.

1.2. Definition of the term “device”

In these instructions, the term “device” always refers to the Type 8792/8793
english
Type 8792, 8793Type 8792, 8793
General Information
Safety Instructions

2. AUTHORIZED USE

Incorrect use of the Type 8792 and 8793 can be dangerous to people, nearby equipment and the environment.
The device is designed for the open-loop control and closed-loop control of media.
• If using Types 8792 and 8793 in the potentially explosive area, observe the specifications on the additional plate for Ex devices.
• Devices which do not have an additional plate for Ex devices must not be used in the potentially explosive area.
• The device must not be exposed to direct sunlight.
• Pulsating direct voltage (rectified alternating voltage without smoothing) must not be used as operating voltage.
• During use observe the permitted data, the operating conditions and conditions of use specified in the con­tract documents and operating instructions, as described in chapter “Description of System” - “11. 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 device is suitable for the specific application case and check this out if required.
• Correct transportation, correct storage and installation and careful use and maintenance are essential for reli­able and faultless operation.
• Use the Type 8792 and 8793 only as intended.

2.1. Restrictions

If exporting the system/device, observe any existing restrictions.
english
Type 8792, 8793Type 8792, 8793
General Information Safety Instructions

3. 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 – high pressure!
• Before loosening the pneumatic lines and valves, turn off the pressure and vent the pneumatic lines.
Risk of electric shock!
• 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!
Risk of burns/risk of fire if used continuously through hot device surface!
• Keep the device away from highly flammable substances and media and do not touch with bare hands.
General hazardous situations.
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.
• Do not supply the supply pressure connection of the system with aggressive or flammable mediums.
• Do not supply the supply pressure connection 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.
• The general rules of technology apply to application planning and operation of the device.
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 61340-5-1 to minimise or avoid the possibility of damage caused by sudden electrostatic discharge!
• Also ensure that you do not touch electronic components when the operating voltage is present!
english
Type 8792, 8793Type 8792, 8793
General Information
Safety Instructions
The Type 8792/8793 were developed with due consideration given to the accepted safety rules and are state-of-the-art. Nevertheless, dangerous situations may occur.
Failure to observe this operating manual and its operating instructions as well as unauthorized tampering with the device release us from any liability and also invalidate the warranty covering the devices and accessories!

4. USE IN THE EX AREA

4.1. Basic safety instructions for use in the Ex area

DANGER!
Risk of explosion!
To prevent the risk of explosion, observe not only the basic safety instructions in the respective operating instructions for operation in the Ex area, but also the following:
• Installation, operation and maintenance may be performed by qualified technicians only.
• Observe the applicable safety regulations (also national safety regulations) as well as the general rules of technology for construction and operation.
• Do not repair the device yourself, but replace it with an equivalent device. Repairs may be performed by the manufacturer only.
• Do not expose the device to any mechanical and/or thermal loads which will exceed the limits described in the operating instructions.
4.2. Safety instructions for the installation and maintenance of Ex devices
DANGER!
Risk of explosion!
To prevent the risk of explosion, observe the following during installation and maintenance in the Ex area:
• Do not open the device housing.
• To avoid electrostatic charges, clean the housing surface with a damp cloth only.
• Secure cable connections, which use circular connectors, with suitable locking clips. (For example: EXCLIP, FA. Phoenix Contact, Type SAC-M12-EXCLIP-M, Art. no. 1558988 or
Type SAC-M12-EXCLIP-F, Art. no. 1558991.
• Use only cable and line entry points which have been approved for the respective application area and which have been screwed into place according to the associated installation instructions.
• Install pre-assembled cable glands according to the installation instructions supplied by the gland manufacturer. Before start-up in the Ex area, check whether the cable gland, as described in the associated installation instructions, has been installed.
• Close all unnecessary cable glands with lock screws approved for the explosions area.
Maintenance: If installation is performed carefully, maintenance will not be required.
english
Type 8792, 8793
General Information Safety Instructions

5. GENERAL INFORMATION

5.1. Scope of supply

In general it consists of:
• Type 8792/8793 and
• associated operating instructions.
- Brief instructions (Quickstart) in printed form as well as
- Main instructions on CD.
We will provide you with attachment kits for linear actuators or rotary actuators as accessories. For the circular plug-in connector version (multi-pole version) of Type 8792/8793, we will provide you with suitable cable connectors as accessories.
If there are any discrepancies, please contact us immediately.

5.2. Contact address

Germany
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: info@de.buerkert.com
International
Contact addresses can be found on the final pages of the printed brief instructions (Quickstart).
And also on the internet at: www.burkert.com

5.3. Warranty

The warranty is only valid if the Type 8792/8793 are used as intended in accordance with the specified application conditions.

5.4. Master code

10
Operation of the device can be locked via a freely selectable user code. In addition, there is a non-changeable master code with which you can perform all operator actions on the device. This 4-digit master code can be found on the last pages of the printed brief instructions which are enclosed with each device.
If required, cut out the code and keep it separate from these operating instructions.

5.5. Information on the internet

The operating instructions and data sheets for Type 8792 and 8793 can be found on the Internet at:
www.burkert.com
english
Types 8792, 8793

Description of System

conTenTs
6. DESCRIPTION AND FEATURES OF THE TYPE 8792/8793 .......................................................................................13
General description ...........................................................................................................................................................13
6.1.
6.1.1. Features .....................................................................................................................................................13
6.1.2. Combination with valve types and mounting versions ....................................................................14
6.1.3. Overview of the mounting options....................................................................................................... 15
Designs ....................................................................................................................................................................................16
6.2.
6.2.1. Type 8792, positioner ............................................................................................................................ 16
6.2.2. Type 8793, process controller .............................................................................................................16
STRUCTURE ........................................................................................................................................................................................17
7.
Representation .....................................................................................................................................................................17
7.1.
Function diagram ................................................................................................................................................................18
7.2.
7.2.1. Diagram illustrating single-acting actuator ........................................................................................18
POSITIONER TYPE 8792 ..............................................................................................................................................................19
8.
Positioner (position controller) Type 8793 Remote with external position sensor .........................19
8.1.
Schematic representation of the position control ............................................................................................20
8.2.
Positioner software ............................................................................................................................................................21
8.3.
PROCESS CONTROLLER TYPE 8793 ....................................................................................................................................23
9.
Schematic representation of process control .....................................................................................................24
9.1.
Type 8793 remote operation with external position sensor ........................................................................25
9.2.
The process controller software .................................................................................................................................26
9.3.
INTERFACES OF THE POSITIONER / PROCESS CONTROLLER ...........................................................................28
10.
TECHNICAL DATA .............................................................................................................................................................................29
11.
Conformity ..............................................................................................................................................................................29
11.1.
Standards ................................................................................................................................................................................29
11.2.
Operating conditions ........................................................................................................................................................29
11.3.
Rating plate and additional plate for Ex devices ...............................................................................................29
11.4.
Mechanical data ...................................................................................................................................................................30
11.5.
English
11
Types 8792, 8793
Description of System
11.6. Electrical data .......................................................................................................................................................................31
Pneumatic data ....................................................................................................................................................................32
11.7.
Safety end positions after failure of the electrical or pneumatic auxiliary power ...........................33
11.8.
Factory settings ...................................................................................................................................................................34
11.9.
12
English
Types 8792, 8793
Description of System

6. DESCRIPTION AND FEATURES OF THE TYPE 8792/8793

6.1. General description

The positioner Type 8792 / process controller Type 8793 is a digital, electro-pneumatic position controller for pneumatically actuated continuous valves. The device incorporates the main function groups
- Position sensor
- Electro-pneumatic control system
- Microprocessor electronics
The position sensor measures the current positions of the continuous valve. The microprocessor electronics continuously compare the current position (actual value) with a set-point position value specified via the standard signal input and supplies the result to the positioner/process controller. If there is a control difference, the electro-pneumatic control system corrects the actual position accordingly.

6.1.1. Features

• Models
- Positioner (position controller) Type 8792
- Process controller with integrated position controller, Type 8793.
• Position sensors
- internal high resolution conductive plastic potentiometer or
- external non-contact, non-wearing position sensor (remote).
• Microprocessor-controlled electronics
for signal processing, control and valve control.
• Operating module
Operation of the device is controlled by four keys. The 128 x 64 dot matrix graphics display enables you to display the set-point or actual value and to configure and parameterize via menu functions.
• Control system
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.
• Feedback (optional)
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.
• Pneumatic interfaces
Internal thread G1/4“
• Electrical interfaces
Circular plug-in connector or cable gland
• Housing
Plastic-coated aluminium housing with hinged cover and captive screws.
13
English
Types 8792, 8793
Description of System
• Mounting on linear actuator according to NAMUR recommendation (DIN IEC 534 T6) or on rotary actuator according to VDI/VDE 3845.
• Optional Remote version for DIN rail mounting or for mounting bracket

6.1.2. Combination with valve types and mounting versions

The positioner Type 8792 / process controller Type 8793 can be mounted on different continuous 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 / process controller Type 8793; they differ in the attachment option and in the position sensor.
Device version 1: An internal position sensor is used which is designed as a rotary potentiometer. Type 8792/8793 is mounted directly on the actuator or attached to the side.
Device version 2:
An external position sensor (linear or rotative) via a digital interface. The Type 8792/8793 is attached to a wall either with a DIN rail or with a mounting bracket (remote design).
14
English
Types 8792, 8793
Description of System

6.1.3. Overview of the mounting options

Mounting on rotary actuator
Mounting with mounting bracket on a linear actuator
Remote mounting with mounting bracket
Remote mounting with DIN rail
Table 1: Overview of the mounting options
15
English
Types 8792, 8793
Description of System

6.2. Designs

6.2.1. Type 8792, positioner

The position of the actuator is regulated according to the position set-point value. The position set-point value is specified by an external standard signal (or via field bus).

6.2.2. Type 8793, process controller

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 process controller Type 8793 is operated with a 128 x 64 dot matrix graphics display and a keypad with 4 keys.
The process controller 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 set­point value can be set by an external signal.
16
English
Types 8792, 8793
Description of System

7. STRUCTURE

The positioner Type 8792 and process controller Type 8793 consist of the micro-processor controlled electronics, the position sensor and the control system.
The device is designed using three-wire technology. Operation is controlled by four keys and a 128x64 dot matrix graphics display.
The pneumatic control system for single-acting and double-acting actuators consists of 2 solenoid valves.

7.1. Representation

Mechanical position indicator
Operating 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
Pressure-relief valve
Electronic module
Internal position sensor
Control system
Figure 1: Structure, Type 8792 / 8793
Shaft for position sensor
Cable gland
17
English
Types 8792, 8793
Description of System

7.2. Function diagram

7.2.1. Diagram illustrating single-acting actuator

The black lines in “Figure 2” specify the function of the position controller circuit in Type 8792.
The grey part of the diagram indicates the additional function of the superimposed process control circuit in Type
8793.
Compressed-
Type 8792 / 8793
air supply
Continuous valve with single-acting actuator
Position set­point value
Process set-point value
Process actual value
Sensor
Positioner
Actual position
Nominal position
Process controller
1
2
Control system*
Position sensor
* Control system
1: Aeration valve 2: Bleed valve
Exhaust air
18
Figure 2: Structure, positioner Type 8792 / process controller 8793
The remote design has the position sensor situated outside the device directly on the continuous valve and is connected to the latter by a cable.
English
Types 8792, 8793
Description of System

8. POSITIONER TYPE 8792

The position sensor records the current position (POS) of the pneumatic actuator. The positioner compares this actual position value with the set-point value (CMD) which is specified as a standard signal. If there is a control dif­ference (Xd1), the actuator is aerated and deaerated via the control system. In this way the position of the actuator is changed until control difference is 0. Z1 represents a disturbance variable.
Z1
CMD Xd1
+
-
PositionerPosition set-
point value
Position control circuit
Figure 3: Position control circuit in Type 8792
B1
E1
POS
P
K
Control system Solenoid valves
Position sensor
Valve opening
Continuous valve
8.1. Positioner (position controller) Type 8793 Remote
with external position sensor
In the case of this model, Type 8793 has no position sensor in the form of a rotary position sensor, but an external path sensor.
By connecting the path sensor to the analog interface (4... 20 mA), Type 8793 can be operated only as a positioner (position controller).
The options for connection of a path sensor are described in Chapter “12.4. Remote operation with external position sensor”.
English
19
Types 8792, 8793
Description of System

8.2. Schematic representation of the position control

POS
CMD
TEMP
INPUT
X.CONTROL
DBND
POS
CMD
DIR.ACT X.LIMIT
20
4 – 20 mA
0 – 20 mA
0 – 10 V
Figure 4: Schematic representation of position control
English
0 – 5 V
DIR.CMD SPLTRNG CHARACT CUTOFF X.TIME
INP
Types 8792, 8793
Description of System

8.3. Positioner software

Configurable auxiliary functions Effect
Correction line to adjust the operating characteristic
CHARACT
Sealing function
CUTOFF
Sense of effective direction of the controller set­point value
DIR.CMD
Sense of effective direction of the actuator
DIR.ACT
Signal range splitting
SPLTRNG
Stroke limit
X.LIMIT
Limiting the control speed
X.TIME
Insensitivity range
X.CONTROL
Code protection
Selection of the transfer characteristic between input signal and stroke (correction characteristic)
Valve closes tight outside the control range. Specification of the value (in %), from which the actuator is completely deaerated (when 0%) or aerated (when 100%).
Reversal of the sense of effective direction of the set­point value
Adjustment of the sense of effective direction between aeration state of the actuator and the actual position
Splitting of the standard signal range to two or more positioners
Mechanical valve piston movement only within a defined stroke range
Input of the opening and closing time for the entire stroke
The positioner is initially actuated from a control dif­ference to be defined
Code protection for settings
SECURITY
Safety position
SAFEPOS
Signal level error detection
SIG.ERROR
Binary input
BINARY. IN
Analogue feedback (option)
OUTPUT 2 binary outputs (option)
OUTPUT User calibration
CAL.USER
Factory settings
SET.FACTORY
Serial interface
SER.I/O
Definition of the safety position
Check the input signals for sensor break.
Warning output on the display and start up of the safety position (if selected)
Switch over AUTOMATIC / MANUAL or
Start up of the safety position Status signal set-point value or actual value
Output of two selectable binary values
Change to the factory calibration of the signal input
Reset to factory settings
Configuration of serial interface
21
English
Configurable auxiliary functions Effect
Types 8792, 8793
Description of System
Setting display
Adjustment of the display of the process level
EXTRAS SERVICE
POS.SENSOR
For internal use only
Setting interface remote path sensor (available for Type 8793 Remote only. See chapter “8.1. Positioner (position controller) Type 8793 Remote with external position sensor”.
Simulation software
For simulation of the device functions
SIMULATION DIAGNOSE (Option)
Table 2: Positioner software. Configurable auxiliary functions
Monitoring of processes
Hierarchical operating concept for easy operation on the following operating levels
Process level On the process level switch between AUTOMATIC mode
and MANUAL mode.
Setting level On the setting level specify certain basic functions during
start-up and, if required, configure additional functions
Table 3: The positioner software. Hierarchical operating concept.
22
English
Types 8792, 8793
Description of System

9. PROCESS CONTROLLER TYPE 8793

In the case of process controller Type 8793 the position control mentioned in Chapter “8” becomes the subor­dinate auxiliary control circuit; this results in a cascade control. The process controller in the main control circuit of Type 8793 has a PID function. The process set-point value (SP) is specified as set-point value and compared with the actual value (PV) of the process variable to be controlled. The position sensor records the current position (POS) of the pneumatic actuator. The positioner compares this actual position value with the set-point value (CMD), which is determined by the process controller. If there is a control difference (Xd1), the actuator is aerated and deaerated via the control system. In this way the position of the actuator is changed until control difference is 0. Z2 represents a disturbance variable.
Z1
CMD
SP
Process set­point value
Xd1
+
-
Positioner
B1 E1
Control system Solenoid valves
P
K
Continuous valve
Valve opening
POS
Position sensor
Position control circuit
Z2
Xd2
+
-
CMD
Position control circuit
Process
Valve opening
Process
Process variable
controller
PV
Figure 5: Signal flow plan of process controller
Transmitter
23
English
Types 8792, 8793
Description of System

9.1. Schematic representation of process control

POS
CMDPVSP
TEMP
POS
-
DIR.ACT X.LIMIT
X.CONTROL
DBDx
+
CMD
PV SCALE
DIR.CMD CHARACT CUTOFF X.TIME
FILTER
PV
PV
Q
4 – 20 mA
0 – 20 mA
0 – 10 V
0 – 5 V
SP SCALE
SP
-
+
SP
P.CONTROL
PARAMETER
SETUP
24
Figure 6: Schematic representation of process control
English
Types 8792, 8793
Description of System

9.2. Type 8793 remote operation with external position sensor

In the case of this model the positioner has no position sensor in the form of a rotary position sensor, but an external remote sensor.
Depending on the connection type of the path sensor, Type 8793 functions as a
• Process controller or
• Positioner (position controller)
The following connection options are possible:
Function
Interface sensor Setting in the menu (ADD.FUNCTION)
Type 8793
Process controller digital (serial) Remote Sensor Type 8798
POS.SENSOR → DIGITAL For menu description see Chapter “26.2.19”
Positioner (position controller)
analog (4 ... 20 mA) *
Any, high-resolution path sensor
POS.SENSOR → ANALOG For menu description see Chapter “26.2.19”
Table 4: Connection options type 8793 with external position sensor
* If the path sensor is connected to the process controller Type 8793 via the analog interface, it can be
operated only as a positioner (position controller).
English
25

9.3. The process controller software

Configurable auxiliary functions Effect
Correction line to adjust the operating characteristic
CHARACT
Sealing function
CUTOFF
Sense of effective direction of the controller set­point value
DIR.CMD
Sense of effective direction of the actuator
DIR.ACT
Signal range splitting
SPLTRNG
Stroke limit
X.LIMIT
Limiting the control speed
Selection of the transfer characteristic between input signal and stroke (correction characteristic)
Valve closes tight outside the control range. Specification of the value (in %), from which the actuator is completely deaerated (when 0%) or aerated (when 100%).
Reversal of the sense of effective direction of the set­point value
Adjustment of the sense of effective direction between aeration state of the actuator and the actual position
Splitting of the standard signal range to two or more positioners
Mechanical valve piston movement only within a defined stroke range
Input of the opening and closing time for the entire stroke
Types 8792, 8793
Description of System
X.TIME
Insensitivity range
X.CONTROL
Code protection
SECURITY
Safety position
SAFEPOS
Signal level error detection
SIG.ERROR
Binary input
BINARY. IN
Analogue feedback (option)
OUTPUT 2 binary outputs (option)
OUTPUT User calibration
CAL.USER
Factory settings
The positioner is initially actuated from a control dif­ference to be defined
Code protection for settings
Definition of the safety position
Check the input signals for sensor break.
Warning output on the display and start up of the safety position (if selected)
Switch over AUTOMATIC / MANUAL or
Start up of the safety position Status signal set-point or actual value
Output of two selectable binary values
Change to the factory calibration of the signal input
Reset to factory settings
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SET.FACTORY
Serial interface
SER.I/O
Setting display
EXTRAS
Configuration of serial interface
Adjustment of the display of the process level
English
Types 8792, 8793
Description of System
Configurable auxiliary functions Effect
SERVICE
For internal use only
Simulation software
For simulation of the device functions
SIMULATION DIAGNOSE (Option)
POS.SENSOR
Monitoring of processes
Setting interface remote path sensor (available for Type 8793 Remote only. See chapter “8.1. Positioner (position controller) Type 8793 Remote with external position sensor”.
Table 5: The process controller software. Configurable auxiliary functions of the position controller
Functions and setting options of the process controller
Process controller
PID - Process controller is activated
P.CONTROL
Adjustable parameters
P.CONTROL - PARAMETER
Parameterization of the process controller
Proportional coefficient, reset time, hold-back time and operating point
Scalable inputs
P.CONTROL - SETUP
Configuration of the process controller
- Selection of the sensor input
- Scaling of process actual value and process set-point value
Selection of the set-point value defaults
Automatic sensor detection or manual sensor setting
Sensor types Pt100 and 4 – 20 mA are automatically detected or can be set manually via the operating menu
P.CONTROL - SETUP - PV INPUT
Selection of the set-point value specification
P.CONTROL - SETUP - SP INPUT Process characteristic linearization
P.Q‘LIN Process controller optimization
P.TUNE
Table 6: The process controller software. Functions and setting options of the process controller
Set-point value specification either via standard signal input or via keys
Function for automatic linearization of the process characteristics
Function for automatic optimization of the process con­troller parameters
Hierarchical operating concept for easy operation on the following operating levels
Process level On the process level switch between AUTOMATIC and
MANUAL mode.
Setting level On the setting level specify certain basic functions during
start-up and configure auxiliary functions if required.
Table 7: The process controller software. Hierarchical operating concept
27
English
Types 8792, 8793
Description of System

10. INTERFACES OF THE POSITIONER / PROCESS CONTROLLER

Inputs for position or process set-point value 4 – 20 mA 0 – 20 mA 0 – 10 V 0 – 5 V
Input for process actual value* 4 – 20 mA frequency Pt 100
Binary input
24 V DC
Note: Optional inputs and outputs are illustrated by dotted lines
Positioner / Process controller
Inputs
Supply
Operation
2 binary outputs
24 V PNP
Initiator 1 / Initiator 2
24 V PNP NO
Outputs
Analogue feedback
4 – 20 mA 0 – 10 V
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Figure 7: Interfaces of the positioner / process controller

The Types 8792 and 8793 are 3-wire devices, i.e. the power (24 V DC) is supplied separately from the set-point value signal.
* only for process controller Type 8793
English
Types 8792, 8793
Description of System

11. TECHNICAL DATA

11.1. Conformity

In accordance with the Declaration of conformity, Type 8792 / 8793 is compliant with the EC Directives.

11.2. Standards

The applied standards which are used to demonstrate compliance with the EC Directives are listed in the EC-Type Examination Certificate and/or the EC Declaration of Conformity.

11.3. Operating conditions

NOTE!
If used outside, the device may be exposed to direct sunlight and temperature fluctuations which 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 minimum value.
Environmental temperature 0 – +60 °C
Degree of protection IP 65 / IP 67* according to EN 60529
(only if cables, plugs and sockets have been connected correctly)
* If the device is used under IP 67 conditions, the ventilation filter (see “Figure 1: Structure, Type 8792 / 8793” must be removed and the exhaust air conducted into the dry area.

11.4. Rating plate and additional plate for Ex devices

Explanation of the device-specific specifications on the rating plate:
Operating voltage / controlExample:
Type
8792 24V / DC Remote IP65/IP67 P = 1,4 ... 7 bar
Tamb 0°C...+60°C Ser.-Nr.: 001000
00177689 W12LL
D-74653 Ingelfingen
Degree of protection
Nominal pressure
Ambient temperature
Serial number
Figure 8: Example of rating plate
Identification number
29
English
Types 8792, 8793
Description of System
Additional plate for Ex devices:
Devices, which may be used in the explosion-protected area, are identified by the additional plate for Ex devices.
1. Do not open under
II 3 G Ex nA IIC T4 II 3 D Ex tD A22 T135°C
Figure 9: Additional plate for Ex devices
explosive atmosphere
2. In Hazardous Areas the surface
Warning:
may only be cleaned with a wet towel

11.5. Mechanical data

Dimensions See data sheet
Material
Housing material Plastic-coated aluminium
Other external parts Stainless steel (V4A), PC, PE, POM, PTFE
Sealing material EPDM, NBR, FKM
Mass approx. 1.0 kg
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English
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