Bronkhorst FLOW-BUS interface Manuel d'utilisateur télécharger pdf (Page 25)

BRONKHORST®

Page25

FLOW‐BUSinterface9.17.024



6.2 TROUBLESHOOTINGHINTSANDTIPS



Symptom Possiblecause Action

NooutputsignalonFLOW‐BUSinterface BadcommunicationwithFLOW‐BUS Checkcommunicatione.g.withlocal

readoutmoduleorPC‐testprogram

Noorslowresponsetosetpointchanges Slopevaluecouldbesettoohigh(ramp

functionforsetpointsignal)

Checkand/orchangeslopevaluewith

readoutmoduleorPC‐softwareprogram

 Controlmode/setpointsourcefor

instrumentcouldpointtoadifferent

setpointsource

Checkifcorrectcontrolmode/setpoint

sourceisselectedfortheinstrument

 Otherinstrument(orPC)connectedto

FLOW‐BUScouldchangethesetpoint

Makesurewhoisinchargetochange

setpoints

 Polynomialfactorscouldbewrong Checkifrightfluidhasbeenselectedand

checkpolynomialfactorsA..Dwiththose

onyourcalibrationcertificate

Inaccuracyofmeasurement Wrongfluid(andthuscalibrationsettings)

couldbeselected(upto8fluidspossible)

Checkifcorrectfluidisselectedforthis

instrument

Checkifpoweringofinstrumentisdone

correctly

Analogoutputrangeistoolow/high Wrongoutputrangecouldbeselected Checkifwantedoutputrange(analog)is

selected

No/badconnectiontoFLOW‐BUS Wrongcableused



Checkcabling



 BadterminationofRS485bus‐line Checkbustermination

 Othermodule(s)onthebuscouldcause

trouble

Checkcorrectfunctioningfromother

module(s)onthebus(PC‐programswith

interfacemodulesincluded)

NocommunicationpossiblewithPC‐

softwareprogram

Interfacesettingscouldbewrong Checksettingse.g.forRS232(COM‐port

andbaudrate)

 InterfacehasbadconnectiontoFLOW‐

BUS

Checkcablingofinterface

RedorgreenLED’sareblinkingontopof

theinstrument

Instrumentisinaspecialoperationmode

orisindicatingsomekindof

error/warning

Seemanual9.17.023formoredetails

No/badreactiontomanualinstructionsby

meansofmicropush‐buttonswitchontop

Someactionscanonlybeusedunder

specialconditions

Seemanual9.17.023formoredetails

Master‐slavecontrollingdoesn’tfunction

well

Connectiontomastersignalcouldbelost Checkifmasteroutputisgivencorrectly

 Settingsforthisspecialcontrollingmode

couldbewrong

Checkifsettingsarecorrect(controlmode,

slave‐factor)

Controllerdoesn’tfunctionaswanted Settingsforcontrollerareforother

behaviourthanyouwant

Undercertainconditionsyoucouldrunan

auto‐tuneforcontrolleroptimisation.

(seemanual9.17.023)

Changeresponsefactorsettingsfor

controller(seemanualofreadout/control

moduleor

PC‐software)

Othertroubles Oneormoreparametersettingscouldbe

wrong

Getbackoriginalfactorysettingsbymeans

ofmicropush‐buttonontop(seemanual

9.17.023)

Contactsalesrepresentativeforassistance

iftheabovedoesn’thelp



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Bronkhorst FLOW-BUS interface Manuel d'utilisateur Page 25

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