Burkert 8681 - Autotune Sequence Example

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Position Measuring System
IfnoautomaticTeachfunction(Autotune)hasbeenstarted10safterswitchingtoAutotunemode,
theautomaticTeachfunction(Autotune)isexitedautomatically.
IfanautomaticTeachfunction(Autotune)doesnotrunproperlyorisaborted(ife.g.nocompressed
airisconnected),thepositionsalreadytaughtaredeletedagain,thecorrespondingautomatic
Teachfunction(Autotunefunction)isleftandswitchedtonormaloperation.
TheTeachpositionsaresetto"nottaught",i.e.theTopLEDashesinthefaultcolour.
In the case of the design for double-acting actuators(solenoidvalvesNC+NO)onlyautomatic
Teachfunctions(Autotune)1and2arepossible(comparechapter“19.1”onpage127).
20.2.3 Sequence of the automtic Teach functions (Autotune)
Automatic Teach function / Autotune 1:
Control Eect on the process valve Internal program Error
T2 + T3 Autotune mode started
T1 Autotune 1 starts
Closed position Teach T1
Open valve Activate V1
Wait period 10s
Open position Teach T2
Valve closing Deactivate V1
Valve closes Wait on position S1 S1 Timeout 15 s
Autotune mode completed
Example illustration of the Autotune sequence 1:
1.CheckinwhatpositiontheprocessvalvemustbeatthebeginningoftheAutotuneprocedure(here:
closedposition).Closeitifnecessary!
2.PresstheteachbuttonsT2andT3atthesametime(for2.5s)toselecttheAutotunemode.
ThismodewillbeindicatedbycontinuousilluminationoftheTopLED(centraldevicestatusLED).
3.PressteachbuttonT1(for0.5s)tostarttheAutotune1mode.Thiswillbeindicatedbyilluminationofthe
TopLEDina"chasermode".Theprogrammedsequencefor"Auto-Teachsequence"1willnowrunfully
automatically:
 -ThepositioninthattheprocessvalveisadjustedwillbetaughtrstaspositionS1.Thepositionofthe
processvalvemustthereforebecheckedrst!
- After that, valve V1 is activated. It initiates opening of the process valve.
 -Aftermaximum10s,theprocessvalvehasreachedpositionS2(openposition).
- Then position S2 is taught.
- After that, valve V1 is deactivated. It initiates closing of the process valve.
 -Oncetheprocessvalveisclosed(after15smaximum),positionS1isdisplayedbytheTopLED.
4.Autotunesequence1iscomplete:PositionsS1andS2aretaught.
In the event that a timeoutoccurs(after15secondswaitperiod),thecorrespondingautomaticTeach
function(Autotunefunction)willbeexitedandswitchedtonormaloperation.
Furthermore,theTeachpositionsaresetto"nottaught",i.e.theTopLEDashesinthefaultcolour.
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Control Head Type 8681