Samson 3725 series Service manual

Mounting and

Operating Instructions

EB 8394 EN

Firmware version 1.12

Edition June 2014

Series 3725

Type3725 Electropneumatic Positioner

Denition of signal words

DANGER!

Hazardous situations which, if not

avoided, will result in death or seri-

ous injury

WARNING!

Hazardous situations which, if not

avoided, could result in death or seri-

ous injury

NOTICE

Property damage message or mal-

function

Note:

Additional information

Tip:

Recommended action



2 EB 8394 EN

Contents

EB 8394 EN 3

1 General safety instructions.............................................................................6

2 Article code...................................................................................................7

3 Design and principle of operation ..................................................................8

3.1 Technical data .............................................................................................10

4 Mounting the positioner...............................................................................12

4.1 Mounting sequence......................................................................................12

4.2 Lever and pin position ..................................................................................12

4.3 Direct attachment.........................................................................................14

4.3.1 Type3277-5andType2780-2Actuators ......................................................14

4.3.2 Type3277Actuator .....................................................................................18

4.4 AttachmentaccordingtoIEC60534-6...........................................................20

4.5 AttachmenttoType3372Actuator(V2001)...................................................22

4.6 Attachmenttorotaryactuators ......................................................................24

4.6.1 Heavy-dutyversion ......................................................................................26

4.6.1 MountingtheType3710ReversingAmplier .................................................28

4.7 Accessoriesandmountingparts....................................................................29

5 Connections ................................................................................................33

5.1 Pneumatic connections..................................................................................33

5.1.1 Supply pressure ...........................................................................................33

5.2 Electricalconnections ...................................................................................34

5.2.1 Electricpowersupply ...................................................................................35

5.2.2 Selecting cables and wires............................................................................35

5.2.3 Equipmentforuseinzone2 .........................................................................35

5.2.4 Cableentry .................................................................................................35

6 Operation...................................................................................................36

6.1 Operatingcontrols .......................................................................................36

6.1.1 Capacitivekeys............................................................................................36

6.1.2 VolumerestrictionQ.....................................................................................36

6.1.3 Display .......................................................................................................37

7 Start-up ......................................................................................................38

4 EB 8394 EN

Contents

8 Settings.......................................................................................................39

8.1 Adaptingthedisplay....................................................................................39

8.2 Enablingcongurationtochangeparameters.................................................39

8.3 AdjustingthevolumerestrictionQ.................................................................40

8.4 Enteringthedirectionofaction......................................................................41

8.5 Enteringthedirectionofaction......................................................................41

8.6 Limitingthesignalpressure...........................................................................42

8.7 Settingotherparameters...............................................................................42

8.8 Initialization ................................................................................................43

8.8.1 Cancelinginitialization.................................................................................44

8.9 Zerocalibration ...........................................................................................44

8.9.1 Cancelingzerocalibration............................................................................45

8.10 Manualmode..............................................................................................45

8.11 R

eset...........................................................................................................47

8.12 Fault ...........................................................................................................47

8.12.1 Resettingerrorcodes....................................................................................48

9 Code list .....................................................................................................49

9.1 Parameter codes ..........................................................................................49

9.2 Errorcodes..................................................................................................52

10 Maintenance ...............................................................................................54

11 Servicing explosion-protected devices ..........................................................54

12 Dimensions in mm.......................................................................................55

12.1 FixinglevelsaccordingtoVDI/VDE3845(September2010) ..........................56

EB 8394 EN 5

Contents

Firmware revisions

1.02(old) 1.03(new)

Internalrevisions

1.03(old) 1.10(new)

Settingofthetravelinstepsof0.5mm(P4parametercode)

Monitoringoftheendstopsonlyduringinitializationandinman-

ual mode

Tosuppresscommon-modeinterferenceonthesignallines,theD

componentofthepositionerisswitchedoffwhentheactuatoris

at a standstill.

1.10(old) 1.11(new)

Internalrevisions

1.11(old) 1.12(currentversion)

Internalrevisions

6 EB 8394 EN

General safety instructions

1 General safety instructions

Foryourownsafety,followtheseinstructionsconcerningthemounting,startupandopera-

tionofthepositioner:

−Thedeviceistobemounted,starteduporoperatedonlybytrainedandexperienced

personnelfamiliarwiththeproduct.Accordingtothesemountingandoperatinginstruc-

tions,trainedpersonnelisreferredtoasindividualswhoareabletojudgetheworkthey

areassignedtoandrecognizepossibledangersduetotheirspecializedtraining,their

knowledgeandexperienceaswellastheirknowledgeoftheapplicablestandards.

−Explosion-protectedversionsofthisdevicearetobeoperatedonlybypersonnelwhohas

undergonespecialtrainingorinstructionsorwhoisauthorizedtoworkonexplosion-pro-

tecteddevicesinhazardousareas.

−Anyhazardsthatcouldbecausedinthevalvebytheprocessmedium,thesignalpres-

sureorbymovingpartsaretobepreventedbytakingappropriateprecautions.

−Ifinadmissiblemotionsorforcesareproducedinthepneumaticactuatorasaresultof

thesupplypressurelevel,itmustberestrictedusingasuitablesupplypressurereducing

station.

To avoid damage to any equipment, the following also applies:

−Proper shipping and storage are assumed.

Note:

Devices with a CE marking fulll the requirements of the Directives 2014/34/EU and

2014/30/EU. The declaration of conformity is included in the Appendix of these in-

structions.



EB 8394 EN 7

Article code

2 Article code

Positioner Type3725- x x x 00000009999

WithLCDandautotune,4to20mAreference

variable

Explosionprotection1)

Without 0 0 0

Intrinsicsafety:ATEX 1100

Intrinsicsafety:STCC 1100

Intrinsicsafety:CSA 1300

Intrinsicsafety:GOST 1130

1) SeeTable1fordetailsonexplosionprotectioncerticates.

Table1: Summary of explosion protection certicates

Type Certication Type of protection

3725-1100

STCC Number No.2860 0ExiaIICT4X

Validuntil 2017-10-08

Number PTB11ATEX2020X

II2GExiaIICT4

Date 2011-08-25

ECtype

examination

certicate

3725-113

Number RUC-DE.GB08.B.00697

1ExiaIICT4GbXDate 2014-12-15

Validuntil 2019-12-14

3725-130 ®

C US

Number 2703735X ExiaIICT4;

ClassI,Zone0,AExiaIICT4;

ClassI,Div.1,GroupsA,B,C,D

Date 2014-06-03

8 EB 8394 EN

Design and principle of operation

3 Design and principle of oper-

ation

TheType3725ElectropneumaticPositioneris

mounted on pneumatic control valves and is

usedtoassign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mainlyconsistsofthefollow-

ingcomponents(seeFig.1):

−Magnetoresistivesensor(2)

−Analogi/pconverter(6)withadown-

streamaircapacitybooster(7)

−Electronicsunitwithmicrocontroller(4)

The travel or opening angle is measured by

thepick-uplever,non-contactmagnetoresis-

tive sensor and downstream electronics.

Thepick-upleverisconnectedtoamagnet

insidethedevice.Themotionofthepick-up

levercausesthedirectionofthemagnetic

eldtochange.Thischangeissensedbythe

sensor. The electronics unit determines the

currentpositionoftheactuatorstemoropen-

inganglefromthisinformation.

Thepositionoftheactuatorstemoropening

angleistransmittedtothemicrocontroller(3)

overtheA/Dconverter(4).ThePDcontrol

algorithm in the microprocessor compares

thisactualpositiontothe4to20mAcontrol

signalafterithasbeenconvertedbythe

A/Dconverter(3).Incaseofasystemdevi-

ation,theactivationofthei/pmodule(6)is

changedsothattheactuatorofthevalve(1)

ispressurizedorventedaccordinglyoverthe

downstreambooster(7).Thesupplyairis

supplied to the booster and the pressure reg-

ulator(8).

The output signal pressure supplied by the

boostercanbelimitedto2.3barbysoft-

ware.

ThevolumerestrictionQ(10)isusedtoopti-

mizethepositionerbyadaptingittotheac-

tuator.

Tight-closing function

Thepneumaticactuatoriscompletelylled

withairorventedassoonasthereference

variablefallsbelow1%orexceeds99%

(seeendpositionssetinP10andP11pa-

rametercodes).

EB 8394 EN 9

Design and principle of operation

810

1Valve 7Aircapacitybooster

2 Sensor 8Pressure regulators

3A/Dconverter 9 Fixed restriction

4 Microcontroller 10 Volumerestriction

5D/Aconverter 11 Display

6 i/pconverter

Fig.1: Circuit diagram

10 EB 8394 EN

Design and principle of operation

3.1 Technical data

Type3725 Positioner

Travel(adjustable) DirectattachmenttoType3277: 5 to 30 mm

DirectattachmenttoType2780-2: 6/12/15mm

AttachmenttoType3372Actuator: 15/30mm

AttachmentaccordingtoIEC60534-6(NAMUR): 5 to 50 mm

Attachmenttorotaryactuators: 24 to 100°

Referencevariablew

(reversepolarityprotec-

tion)

Static destruction limit

4to20mAsignalrange·Two-wiredevice

Split-rangeoperation4to11.9mAand12.1to20mA

±33V

Minimum current

3.8mA

Load impedance Max.6.3V

Supply air

Airqualityacc.to

ISO8573-1

Supplyair:1.4to7bar(20to105psi)

Max.particlesizeanddensity:Class4·Oilcontent:Class3·Pressuredewpoint:Class

3oratleast10Kbelowthelowestambienttemperaturetobeexpected

Signalpressure(output) 0baruptothesupplypressure·Canbelimitedtoapprox.2.3barbysoftware

Characteristic 3characteristicsforglobevalves·9characteristicsforrotaryvalves

Hysteresis ≤0.3%

Sensitivity ≤0.1%

Transit time Onlyforactuatorswithinitializationtime>0.5s1)

Directionofaction w/xreversible

Airconsumption ≤100ln/hwithasupplypressureupto6barandasignalpressureof0.6bar

Airoutputcapacity

Tollactuatorwith

air AtΔp6bar:8.5mn³/h AtΔp=1.4bar:3.0mn³/h, KVmax(20°C)=0.09

To vent actuator AtΔp6bar:14.0mn³/h AtΔp=1.4bar:4.5mn³/h, KVmax(20°C)=0.15

Permissible ambient

temperature

–20to+80°C

–25to+80°Cwithmetalcablegland

Thelimitsinthetestcerticatesadditionallyapplyforexplosion-protectedversions

1) Forfasteractuators,avolumerestrictionmustbeused.Otherwise,theinitializationcannotbeperformed

successfully.

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