Samson 3730 Series Service manual

Translation of original instructions
EB 8384-6 EN
Firmware version 1.12
Edition October 2020
Series3730
Type3730-6 Electropneumatic Positioner
with pressure sensors, communication: HART®
Old design
New design

Note on these mounting and operating instructions
These mounting and operating instructions assist you in mounting and operating the device
safely. The instructions are binding for handling SAMSON devices. The images shown in
these instructions are for illustration purposes only. The actual product may vary.
ÎFor the safe and proper use of these instructions, read them carefully and keep them for
later reference.
ÎIf you have any questions about these instructions, contact SAMSON‘s After-sales Service
([e-mail]).
Documents relating to the device, such as the mounting and operating
instructions, are available on our website at www.samsongroup.com >
Service & Support > Downloads > Documentation.
Denition of signal words
Hazardous situations which, if not avoided,
will result in death or serious injury
Hazardous situations which, if not avoided,
could result in death or serious injury
Property damage message or malfunction
Additional information
Recommended action
DANGER
!
WARNING
!
NOTICE
!
Note
Tip
EB 8384-6 EN

Contents
EB 8384-6 EN
1 Safety instructions and measures ................................................................1-1
1.1 Notes on possible severe personal injury ......................................................1-4
1.2 Notes on possible personal injury ................................................................1-4
1.3 Notes on possible property damage.............................................................1-5
1.4 Special instructions concerning explosion protection ......................................1-6
2 Markings on the device ..............................................................................2-1
2.1 Nameplate .................................................................................................2-1
2.2 Article code................................................................................................2-2
2.3 Firmware versions.......................................................................................2-4
3 Design and principle of operation ...............................................................3-1
3.1 Additional equipment..................................................................................3-2
3.2 Mounting versions.......................................................................................3-3
3.3 Communication ..........................................................................................3-4
3.4 CongurationusingtheTROVIS-VIEWsoftware ............................................3-4
3.5 Technical data ............................................................................................3-5
3.6 Dimensions in mm.....................................................................................3-11
3.6.1 FixinglevelsaccordingtoVDI/VDE3845(September2010) .......................3-15
4 Shipment and on-site transport ...................................................................4-1
4.1 Accepting the delivered goods .....................................................................4-1
4.2 Removing the packaging from the positioner.................................................4-1
4.3 Transporting the positioner...........................................................................4-1
4.4 Storing the positioner ..................................................................................4-1
5 Installation.................................................................................................5-1
5.1 Installation conditions..................................................................................5-1
5.2 Preparation for installation...........................................................................5-2
5.3 Adjusting the lever and pin position..............................................................5-2
5.3.1 Travel tables ...............................................................................................5-4
5.4 Mounting the positioner on the control valve .................................................5-6
5.4.1 Direct attachment........................................................................................5-6
5.4.2 AttachmentaccordingtoIEC60534-6........................................................5-10
5.4.3 AttachmentaccordingtoVDI/VDE3847-1.................................................5-12
5.4.4 AttachmentaccordingtoVDI/VDE3847-2.................................................5-16
5.4.5 AttachmenttoType3510Micro-owValve .................................................5-24
5.4.6 Attachment to rotary actuators ...................................................................5-24
5.4.7 Reversingamplierfordouble-actingactuators ...........................................5-30
5.5 Attachment of external position sensor........................................................5-30

Contents
EB 8384-6 EN
5.5.1 Mounting the position sensor with direct attachment.....................................5-31
5.5.2 MountingthepositionsensorwithattachmentaccordingtoIEC60534-6 ......5-32
5.5.3 MountingthepositionsensortoType3510Micro-owValve........................5-34
5.5.4 Mounting on rotary actuators.....................................................................5-35
5.6 Mounting the leakage sensor .....................................................................5-36
5.7 Retrottinginductivelimitswitch .................................................................5-37
5.8 Mountingpositionerswithstainlesssteelhousings........................................5-38
5.9 Air purging function for single-acting actuators ...........................................5-38
5.10 Connecting the air supply..........................................................................5-40
5.10.1 Signal pressure connection ........................................................................5-41
5.10.2 Output signal display ................................................................................5-41
5.10.3 Supply pressure ........................................................................................5-41
5.10.4 Signal pressure (output).............................................................................5-42
5.11 Connecting the electrical power supply .......................................................5-42
5.11.1 SwitchingamplieraccordingtoEN60947-5-6 .........................................5-44
5.11.2 Establishing communication.......................................................................5-44
5.12 Mounting accessories ................................................................................5-46
6 Operation..................................................................................................6-1
6.1 Serial interface ...........................................................................................6-2
6.2 HART®communication ................................................................................6-4
6.2.1 Dynamic HART®variables ...........................................................................6-4
7 Start-up and conguration..........................................................................7-1
7.1 Determiningthefail-safeposition .................................................................7-2
7.2 AdjustingthevolumerestrictionQ................................................................7-3
7.3 Limitingthesignalpressure..........................................................................7-3
7.4 Checkingtheoperatingrangeofthepositioner .............................................7-4
7.5 Initializingthepositioner .............................................................................7-5
7.5.1 MAX–Initializationbasedonmaximumrange .............................................7-8
7.5.2 NOM–Initializationbasedonnominalrange ..............................................7-9
7.5.3 MAN–InitializationbasedonamanuallyselectedOPENposition...............7-10
7.5.4 MAN2–Initializationbasedonmanuallyselectedendpositions ..................7-12
7.5.5 SUB–Substitutecalibration .......................................................................7-13
7.5.6 TuningtheKPinputlter ............................................................................7-17
7.6 Settingotherparameters............................................................................7-18
7.7 Adjustinginductivelimitswitch...................................................................7-19

Contents
EB 8384-6 EN
8 Operation..................................................................................................8-1
8.1 Adaptingthedisplaydirection .....................................................................8-1
8.2 Switchingoperatingmodes..........................................................................8-2
8.2.1 Closed-loopoperation(automaticmode) ......................................................8-2
8.2.2 Manualmode.............................................................................................8-2
8.2.3 Fail-safeposition(SAFE)..............................................................................8-3
8.3 Performingzerocalibration .........................................................................8-4
8.4 Resettingthepositioner................................................................................8-5
9 Malfunction................................................................................................9-1
9.1 Troubleshooting ..........................................................................................9-2
9.2 Emergency action .......................................................................................9-4
10 Servicing..................................................................................................10-1
10.1 Cleaning the cover window........................................................................10-1
10.2 Cleaningthelters ....................................................................................10-1
10.3 Maintenance of the supply air pressure reducing stations .............................10-2
10.4 Firmware updates .....................................................................................10-2
10.5 Periodic inspection and testing of the positioner...........................................10-2
11 Decommissioning .....................................................................................11-1
12 Removal ..................................................................................................12-1
13 Repairs ....................................................................................................13-1
13.1 Servicing explosion-protected devices.........................................................13-1
Returning devices to SAMSON...................................................................................13-1
14 Disposal...................................................................................................14-1
15 Certicates...............................................................................................15-1
16 Annex A (conguration instructions)..........................................................16-1
16.1 Parameters and functions...........................................................................16-1
16.1.1 Error codes.............................................................................................16-12
16.2 Selecting the characteristic.......................................................................16-19
17 Annex B...................................................................................................17-1
17.1 Accessories ..............................................................................................17-1
17.2 After-salesservice.....................................................................................17-7

6 EB 8384-6 EN

EB 8384-6 EN 1-1
Safety instructions and measures
1 Safety instructions and measures
Intended use
SAMSON'sType3730-6Positionerismountedonpneumaticcontrolvalvesandusedtoas-
sign the valve position to the control signal. The device is designed to operate under exactly
denedconditions(e.g.operatingpressure,temperature).Therefore,operatorsmustensure
that the positioner is only used in applications where the operating conditions correspond to
the technical data. In case operators intend to use the positioner in other applications or con-
ditionsthanspecied,contactSAMSON.
SAMSON does not assume any liability for damage resulting from the failure to use the de-
vice for its intended purpose or for damage caused by external forces or any other external
factors.
ÎRefertothetechnicaldataforlimitsandeldsofapplicationaswellaspossibleuses.
Reasonably foreseeable misuse
TheType3730-6Positionerisnot suitable for the following applications:
−Useoutsidethelimitsdenedduringsizingandbythetechnicaldata
Furthermore, the following activities do not comply with the intended use:
−Useofnon-originalspareparts
−Performing maintenance activities not described in these instructions
Qualications of operating personnel
The positioner must be mounted, started up or operated only by trained and experienced
personnel familiar with the product. According to these mounting and operating instructions,
trained personnel refers to individuals who are able to judge the work they are assigned to
andrecognizepossiblehazardsduetotheirspecializedtraining,theirknowledgeandexpe-
rience as well as their knowledge of the applicable standards.
Explosion-protected versions of this device must be operated only by personnel who has un-
dergonespecialtrainingorinstructionsorwhoisauthorizedtoworkonexplosion-protected
devicesinhazardousareas.

1-2 EB 8384-6 EN
Safety instructions and measures
Personal protective equipment
Nopersonalprotectiveequipmentisrequiredforthedirecthandlingofthepositioner.Work
on the control valve may be necessary when mounting or removing the device.
ÎObservetherequirementsforpersonalprotectiveequipmentspeciedinthevalvedocu-
mentation.
ÎCheck with the plant operator for details on further protective equipment.
Revisions and other modications
Revisions,conversionsorothermodicationsoftheproductarenotauthorizedbySAMSON.
Theyareperformedattheuser'sownriskandmayleadtosafetyhazards,forexample.Fur-
thermore, the product may no longer meet the requirements for its intended use.
Safety features
Uponfailureoftheairsupplyorelectricsignal,thepositionerventstheactuator,causingthe
valve to move to the fail-safe position determined by the actuator.
Warning against residual hazards
Thepositionerhasdirectinuenceonthecontrolvalve.Anyhazardsthatcouldbecausedin
the valve by the process medium, the signal pressure or by moving parts are to be prevented
by taking appropriate precautions. Plant operators and operating personnel must observe all
hazardstatements,warningandcautionnotesinthesemountingandoperatinginstructions,
especially for installation, start-up and service work.
If inadmissible motions or forces are produced in the pneumatic actuator as a result of the
supply pressure, it must be restricted using a suitable supply pressure reducing station.
Responsibilities of the operator
Operators are responsible for proper use and compliance with the safety regulations. Opera-
tors are obliged to provide these mounting and operating instructions to the operating per-
sonnel and to instruct them in proper operation. Furthermore, operators must ensure that op-
erating personnel or third parties are not exposed to any danger.
Responsibilities of operating personnel
Operating personnel must read and understand these mounting and operating instructions as
wellasthespeciedhazardstatements,warningandcautionnotes.Furthermore,theoperat-
ing personnel must be familiar with the applicable health, safety and accident prevention
regulations and comply with them.

EB 8384-6 EN 1-3
Safety instructions and measures
Referenced standards, directives and regulations
DeviceswithaCEmarkingfulllthefollowingrequirementsoftheDirectives:
−Type3730-6:2014/30/EU,2011/65/EU
−Type3730-6-110,-210,-510,-810:2014/30/EU,2014/34/EU,2011/65/EU
DeviceswithanEACmarkingfulllthefollowingrequirementsoftheRegulations:
−Type3730-6:TRCU020/2011
−Type3730-6-113,-213,-813:TRCU012/2011withtheapplicableGOSTstandards:
–ГОСТ31610.11-2014(IEC60079-11:2011)
–ГОСТ31610.15-2012/МЭК60079-15:2005
–ГОСТ31610.0-2014(IEC60079-0:2011)
–ГОСТ IEC60079-1-2011
–ГОСТ IEC60079-31-2010
Seethe'Certicates'sectionforthedeclarationsofconformityandEACcerticates.
Referenced documentation
The following documents apply in addition to these mounting and operating instructions:
−Operating instructions for valve diagnostics: uEB8389
−Safety manual: uSH8384-6
−The mounting and operating instructions of the components on which the positioner is
mounted (valve, actuator, valve accessories etc.).

1-4 EB 8384-6 EN
Safety instructions and measures
1.1 Notes on possible severe personal injury
DANGER
!
Risk of fatal injury due to the ignition of an explosive atmosphere.
Incorrect installation, operation or maintenance of the positioner in potentially explosive
atmospheres may lead to ignition of the atmosphere and ultimately to death.
ÎThefollowingregulationsapplytoinstallationinhazardousareas:EN60079-14
(VDE0165,Part1).
ÎInstallation, operation or maintenance of the positioner must only be performed by
personnelwhohasundergonespecialtrainingorinstructionsorwhoisauthorized
toworkonexplosion-protecteddevicesinhazardousareas.
ÎReadthespecialinstructionsconcerningexplosionprotection(seesection1.4).
1.2 Notes on possible personal injury
WARNING
!
Crush hazard arising from moving parts on the valve.
Control valves contain moving parts (actuator and plug stem), which can injure hands or
ngersifinsertedintothevalve.
ÎDo not touch any moving valve parts while the control valve is in operation.
ÎBeforeperforminganymountingorinstallationworkonthepositioner,putthecontrol
valve out of operation by disconnecting and locking the supply air and control signal.
ÎDo not impede the movement of the actuator and plug stem by inserting objects into
the yoke.
Incorrect electrical connection will render the explosion protection unsafe.
ÎAdhere to the terminal assignment.
ÎDo not undo the enameled screws in or on the housing.
ÎDonotexceedthemaximumpermissiblevaluesspeciedintheECtypeexamination
certicateswheninterconnectingintrinsicallysafeelectricalequipment(UiorU0, lior
I0, Pior P0, Cior C0andLiorL0).

EB 8384-6 EN 1-5
Safety instructions and measures
1.3 Notes on possible property damage
NOTICE
!
Risk of damage to the positioner due to incorrect mounting position.
ÎDo not mount the positioner with the back of the device facing upward.
ÎDo not seal or restrict the vent opening when the device is installed on site.
An incorrect electric signal will damage the positioner.
For the positioner to function properly, a current source and compliance with the pre-
scribed terminal assignment are necessary.
ÎOnly use a current source and never a voltage source.
ÎConnect the electrical wiring to the positioner according to the prescribed terminal
assignment.
Components relevant to explosion protection will be damaged if the permissible
maximum values of the electric data are exceeded.
The maximum permissible values for the intrinsically safe circuits vary depending on the
positionerversion.TheyarelistedintheECtypeexaminationcerticate(seethe'Certi-
cates' section).
ÎObserve the permissible maximum values of the electric data for maintenance, cali-
bration and work on equipment.
Malfunction due to initialization not yet completed.
Theinitializationcausesthepositionertobecalibratedtoadaptittothemountingsitua-
tion.Afterinitializationiscompleted,thepositionerisreadyforuse.
ÎInitializethepositioneronrststart-up.
ÎRe-initializepositionerafterchangingthemountingposition.
Risk of positioner damage due to incorrect grounding of the electric welding
equipment.
ÎDo not ground electric welding equipment near to the positioner.

1-6 EB 8384-6 EN
Safety instructions and measures
Incorrect cleaning will damage the window.
The window is made of Makrolon®and will be damaged when cleaned with abrasive
cleaning agents or agents containing solvents.
ÎDo not rub the window dry.
ÎDo not use any cleaning agents containing chlorine or alcohol or abrasive cleaning
agents.
ÎUseanon-abrasive,softclothforcleaning.
1.4 Special instructions concerning explosion protection
Explosive dust atmospheres of zone21 or zone22
ÎThefollowingappliestotypeofprotectionExiincombustibledustatmospheres:
– Ifintrinsicsafetyisimpairedbytheinuenceofdust,anenclosurecomplyingwith
Clause6.1.3ofEN60079-11withatleastdegreeofprotectionIP5Xmustbe
used.TherequirementsaccordingtoClause6.1.3applytothecableentriesand
conduit systems accordingly.
– ThedegreeofingressprotectionisveriedbyatestaccordingtoIEC60529and
EN60079-0(e.g.performedbyVDE).
ÎFor use in the presence of combustible dust in compliance with type of protection
ExtbIIIC(protectionbyenclosure),observeclause5.6.3ofEN60079-14.
Equipment for use in zone2/zone22:
ÎInequipmentoperatedaccordingtotypeofprotectionExnA(non-sparkingequip-
ment)accordingtoEN60079-15,circuitsmaybeconnected,interruptedorswitched
whileenergizedonlyduringinstallation,maintenanceorrepair.
ÎObserve the special conditions of use mentioned in the statement of conformity for the
rated values and the installation of the series-connected fuse for interconnection of
ExnAcircuits.
ÎForExnAequipment(non-sparkingequipment),circuitsmaybeconnected,interrupt-
edorswitchedwhileenergizedonlyduringinstallation,maintenanceorrepair.

EB 8384-6 EN 1-7
Safety instructions and measures
ÎPositionerswithtypeofprotectionExnAorExtccanbeusedwithahousingcover
with or without a window.
ÎTheTypes3730-61,3730-65and3730-68Positionersare100%identicalinde-
sign, except for the marking and the housing cover.
ÎFortypeofprotectionExnA,connecttheVCCconnectionintheprograminterface
adapterinserieswithafuseaccordingtoIEC60127,250VForTwithafuserating
of max. IN≤40mA.
ÎConnectthesignalcurrentcircuitinserieswithafuseaccordingtoIEC60127-2/VI,
250VTwithafuseratingofIN≤63mA.
ÎConnectthetransmittercurrentcircuitinserieswithafuseaccordingtoIEC60127-
2/VI,250VTwithafuseratingofIN≤40mA.
ÎInstallthefusesoutsidethehazardousarea.
Servicing explosion-protected devices
ÎObserve the following for servicing equipment in a section relevant for explosion
protection:
– Itmustnotbeputbackintooperationuntilaqualiedinspectorhasassessedthe
equipment according to explosion protection requirements, has issued an inspec-
tioncerticateorgiventhedeviceamarkofconformity.Inspectionbyaqualied
inspector is not required if the manufacturer performed a routine test on the de-
vice before putting it back into operation. Document the passing of the routine test
by attaching a mark of conformity to the device.
–Replace explosion-protected components only with original, routine-tested compo-
nents by the manufacturer.
– Devicesthathavealreadybeenusedoutsidehazardousareasandareintended
forfutureuseinsidehazardousareasmustcomplywiththesafetyrequirements
placed on serviced devices. They must be subjected to testing according to the
specicationsinEN60079-19.
– EN60079-19appliestoservicingexplosion-protecteddevices.
– UsetheprotectivecabledesignedbySAMSONwheninterconnectingnon-intrin-
sically safe set point calibrators with intrinsically safe equipment for repair, cali-
bration etc. to ensure that components relevant to explosion protection are not
damaged.

1-8 EB 8384-6 EN

EB 8384-6 EN 2-1
Markings on the device
2 Markings on the device
2.1 Nameplate
Version without explosion
protection
Explosion-protected version
SAMSON 3730 - 6
Digital HART
®
Positioner
Supply
Shutdown at
Input
Diagnostics EXPERTplus
Firmware
Model 3730 - 6
Var.-ID Serial no.
SAMSON AG D-60314 Frankfurt Made in Germany
See technical data for ambient temperature
3
5
6
7
8
4
1
9
10
SAMSON 3730 - 6
Digital HART
®
Positioner
Supply
Shutdown at
Input
Diagnostics EXPERTplus
Firmware
Model 3730 - 6
Var.-ID Serial no.
SAMSON AG D-60314 Frankfurt Made in Germany
* See technical data and explosion-protection
certificate for permissible ambient temperature
and maximum values for connection to
certified intrinsically safe circuits.
1
3
5
67
8
10
2
4
9
Date1)
11
1 Supply pressure
2 Explosion protection marking
3 Input signal
4 Emergency shutdown
5 Features: Yes/No
−Fault indicator
−Limitswitches,software
−Limitswitch,inductive
−Solenoid valve
−Forced venting function
−Position indicator
−Leakagedetection
−Binaryinput
6 Firmware version
7Model number
8 CongurationID
9 Serial number
10 Compliance
11 Month and year of manufacture
(mm/YYYY)
1) Date, Data, Дата or 날짜

2-2 EB 8384-6 EN
Markings on the device
2.2 Article code
Positioner Type3730-6- x x x x x x x 0 x x 0 x 0 0
Withdisplayandautotune,HART®communication,4to20mAsetpoint,
two software limit contacts, one fault alarm contact
Explosion protection
Without 000
ATEX II2GExiaIICT6Gb;II2DExiaIIICT80°CDb 110
IECEx ExiaIIC/IIBT6;ExtDA21IP66T80°C 111
NEPSI ExiaIICT4~T6Ga;ExiaD20T80 112
GOST(EAC) 1ExiaIICT6...T4Gb;ExiaIIICT80°CDb;
ExtbIIICT80°CDb
113
FM Intrinsicallysafe:IS/ClassI,II,III/Div.1/Gr.ABCDEFG;
AExiaIIC/ClassI/Zone0
NonIncendive:NI/ClassI/Div.2/Gr.ABCD;
S/ClassII/Div.2/Gr.FG;EnclosureType4X
130
CSA ExiaIICT4/T5/T6;ClassI,Zone0;
ClassI,GruopsA,B,C,andD;ClassIIGroupsE,FandG;
ClassIII;Type4Enclosure
131
ATEX II2GExd[ia]IICT6Gb;II2DExtbIIICT80°CDb 210
IECEx Exd[ia]IIC/IIBT6;ExtDA21IP66T80°C 211
GOST(EAC) 1Exd[ia]IICT6...T4GbX;ExtbIIICT80°CDbX 213
ATEX II2DExtbIIICT80°CDb 510
ATEX II3GExnAicIICT6Gc;II3DExtcIIICT80°CDcIP66 8 1 0
IECEx ExnAIICT6;ExnLIICT6;ExtDA22IP66T80°C 8 1 1
NEPSI ExicIICT4~T6Gc;ExnAIICT4~T6Gc;
ExtDA22IP66T80°C
81 2
GOST(EAC) 2ExnAIICT6...T4GcX;2ExicIICT6...T4GcX;
ExtcIIICT80°CDcX
81 3
Option (additional equipment)
Inductive limit contact
Without 0
SJ2-SN (NC contact) 1 0
Ventingfunction
Without 0
Solenoidvalve,24VDC 1
Forcedventing,24VDC 2

EB 8384-6 EN 2-3
Markings on the device
Positioner Type3730-6- x x x x x x x 0 x x 0 x 0 0
Additional equipment
Without 0
Position transmitter 1 0
Leakagesensor(includingcableandxingscrew) 2 0
Binaryinput 3 0
External position sensor
Without 0
With,including10mconnectingcable 1 1
Prepared for connection, without sensor 2
Function
Standard (control valves) 0
Emergency shutdown
3.8mA 0
4.4mA 1
Housing material
Aluminum (standard) 1
Stainless steel 2
Special applications
Without 0
Device compatible with paint 1
Exhaustairportwith¼-18NPTthread,backofpositionersealed 2
WithadditionalventholeandVDI/VDE3847adapter 6
Withadditionalventhole 7

2-4 EB 8384-6 EN
Markings on the device
2.3 Firmware versions
Firmware revisions
Old New
1.0x 1.10
Apositionerthathasnotyetbeeninitializedhas'Outofspecication'NAMURstatus(previ-
ously 'Failure').
Default settings of diagnostic parameters revised uEB8389-1.
1.10 1.11
Apositionerthathasnotyetbeeninitializedassumesthe'Outofspecication'NAMURsta-
tus ('Failure' in version 1.10 and lower).
Default values of the dynamic test adapted to the positioner series.
Other production-related revisions.
1.11 1.12
Correction:thevalvepositionisnowmeasuredinthefail-safeposition.Beforecorrection,0
or100%wasissuedasaxedvalueinthefail-safepositionalthoughthevalvepositionmay
have had another value.

EB 8384-6 EN 3-1
Design and principle of operation
3 Design and principle of
operation
ÎSeeFig.3-1
The electropneumatic positioner is mounted
on pneumatic control valves and used to as-
signthevalveposition(controlledvariablex)
tothecontrolsignal(referencevariablew).
The positioner compares the electric control
signal of a control system to the travel or
opening angle of the control valve and issues
asignalpressure(outputvariabley)forthe
pneumatic actuator.
The positioner consists of a travel sensor sys-
tem (2) proportional to resistance, an analog
i/pconverter(6)withadownstreamair
booster(7)andtheelectronicswithmicro-
controller (5).
Thepositioneristtedwiththreebinarycon-
tacts as standard: A fault alarm output indi-
PD
FSK
%
Smm
%
mm
w
x
Q
GG
Serial
Interface 16 13
22
15
A2
A3
BE
A1
11
2
4
21
20
19
5
3
12 25
6
7
23
8
10
1
14
14
w
x
y
24 V DC
9
17 18
x1)
>12 V &
24
x 1)Dependingonversion>3.8mAor>4.4mA
1 Control valve
2 Travel sensor
3 PD controller
4A/Dconverter
5 Microcontroller
6i/pconverter
7Air booster
8Pressure regulator
9 Flow regulator
10 Volumerestriction
11* InductiveLimitcontact
12* Solenoid valve
13* Analog position transmitter
or binary input
14 SoftwarelimitcontactsA1/
A2
15 Fault alarm output A3
16 LCD
17* Actuation of solenoid valve
18 Galvanicisolation
19 D/Aconverter
20 Communication interface
21 HART®connection
22* BinaryinputBI
23 Pressure sensor for supply
air ps
24 Pressure sensor for signal
pressure pout
25* Forced venting
* Option
Fig.3-1: Block diagram

3-2 EB 8384-6 EN
Design and principle of operation
cates a fault to the control room and two
congurablesoftwarelimitcontactsareused
to indicate the end positions of the valve.
The valve position (x) is transmitted as a
either an angle of rotation or travel to the
pick-up lever and to the travel sensor (2) and
suppliedtoananalogPDcontroller.AnA/D
converter (4) transmits the position of the
valve to the microcontroller (5). The PD
controller (3) compares this actual position to
the4to20mADCcontrolsignal(reference
variable) after it has been converted by the
A/Dconverter(4).Incaseofasetpoint
deviation,theactivationofthei/pconverter
(6) is changed so that the actuator of the
controlvalve(1)ispressurizedorvented
accordingly over the downstream booster
(7).Thiscausesthevalveplugtomovetothe
position determined by the reference
variable (w).
Thesupplyairissuppliedtothebooster(7)
andthepressureregulator(8).Anintermedi-
ateowregulator(9)withxedsettingsis
used to purge the positioner and, at the
same time, guarantees trouble-free operation
of the booster. The output signal pressure
supplied by the booster can be limited by
software.Bothpressuresensors(23and24)
monitor the supply pressure psand the signal
pressure pout.
ThevolumerestrictionQ(10)isusedtoopti-
mizethepositioner.
3.1 Additional equipment
Inductive limit contact
In this version, the rotary shaft of the posi-
tioner carries an adjustable tag which actu-
ates the built-in proximity switch. The option-
al inductive contact (11) is connected to A1,
while the remaining software limit contact is
connected to A2.
Solenoid valve
If the operating voltage for the solenoid
valve(12)fallsbelow12V,thesupplypres-
sure for the booster is vented to the atmo-
sphere. As a result, the actuator is vented
and the control valve moves to the fail-safe
position. In manual mode, the manual set
point is reset to 0%. A different manual set
point must entered again.
Forced venting
Ifthevoltagesignalatterminals+81/–82
fallsbelow12V,thei/pconverter(6)isnot
activated. The positioner vents the actuator,
causing the valve to move to the fail-safe po-
sition determined by the actuator, indepen-
dent of the reference variable.
Analog position transmitter
The position transmitter (13) is a two-wire
transmitter and issues the travel sensor signal
asa4to20mAsignalprocessedbythemi-
crocontroller. Since this signal is issued inde-
pendent of the positioner’s input signal, the
momentarytravel/angleofrotationiscon-
trolled in real-time. Additionally, the position
transmitter allows positioner faults to be indi-