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
%
S
mm
%
mm
Q
34
11
6
7
810
1
w
9
x
y
2
5
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.