Bronkhorst FLOW-SMS Series Manual do Utilizador descarregar pdf (Página 24)

BRONKHORST HIGH-TECH B.V.

9.17.057 page 24

5.3 Troubleshooting summary general

Symptom Possiblecause Action

 

Nooutputsignal Nopowersupply Checkpowersupplyandhook‐up

 Checkcableconnectionandhook‐up.

 CheckstatusofLED’s

(seemanual9.17.023chapter10)

 Nosetpoint Foranalogusedinstrumentsmeasure

betweenpin3and8ofsub‐D9

connector.

Fordigitalusemakesuretoperforma

readsetpointaftersending

 Cabledamagedorhooked‐upwrong Checkandcomparesignalsatbothends

ofcable.

 PC‐boarddamagedduetolonglasting

shortageand/orhigh‐voltagepeaks

Returntofactory

 Noortoolowinletpressure Increaseinletpressure

 Openshut‐offatinletandoutlet

 Supplypressuretoohigh,ordifferential

pressureacrossmetertoohigh

Reducesupplypressure

 Valveblocked/contaminated Setcontrolmodetovalvefullyopen

andcheckifitopens

 Sensor/capillaryfailure Returntofactory

 

Maximumoutputsignal Leakageofcontrolvalve Setcontrolmodetovalvecloseand

checkifitcloses

 Sensor/capillaryfailure Returntofactory

 

Outputsignalmuchlowerthan

setpointsignalordesiredflow

Incorrecttypeofgasortoolowinlet

pressure

Testinstrumentonconditionsforwhich

itwasdesigned

 

Oscillation Supplypressure/diff.pressuretoohigh Reducepressure

 Pressureregulatorofsupplypressureis

oscillatingorwrongsized

Replacepressureregulator

 Controlleradjustmentwrong AdjustcontrollerwithPIDsettings

 

Flowisgraduallydecreasing Condensation,canoccure.g.withNH

 Decreasesupplypressureand/orheat

gastobemeasured

 

Smallflowatzerosetpoint Valveleaksduetodamageordirt Returntofactory

 Increasedzeroreadingwithoutflow

causedbyraisedzero‐point

Performanauto‐zeroaction

 

Nodigitalcommunication Occupiedorwrongbusaddress Changeaddresswithsoftwareor

rotary‐switches

 Noorwrongbustermination Checkcablingandtermination

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