Jesco MAGDOS LK Operating Instructions Manual

TroubleshootingType of fault44 © Lutz-Jesco GmbH 2015BA-10221-02-V03Stepper Motor-driven Diaphragm Dosing Pump MAGDOS LK Operating Instructions13.1.3 Delivery rate variesPossible cause RemedyValve leaking or blocked è Clean the valve and vent thedosing pump.è Tighten the screw connections.Valve damaged (e.g. valveballs)è Remove the damaged parts orinstall a new valve.Suction line is leaking è Seal the leak locations or replacethe parts.Suction line is blocked (e.g.screen in foot valve)è Clean the suction lineViscosity too high è Possibly reduce the concentrationof the dosing medium or increasethe temperature.è Install spring-loaded valves.è Increase the pipe diameter.The dosing pump‘s electricaldata does not match that ofthe mains supplyè Check the electrical installation.Suction side pressure too high(pump siphoning)è Install a back-pressure valve inthe pressure line.Pressure peaks due toacceleration with long suctionlinesè Install a suction pressureregu lator.Imprecise dosing due tochangeable positive andnegative suction headsè Install a suction pressureregu lator.System back pressure toohigh (measured at dischargeconnection of dosing pump)è Clean blocked injection nozzle.è Install pulsation dampeners toreduce pressure peaks if pipesare too long.è Check function of safety valves.Tab. 42: Type of fault: Delivery rate varies13.1.4 No stroke movement observedPossible cause RemedyDiaphragm return springbroken.è Contact the manufacturer.Current supply interrupted è Reconnect the current supplyThe dosing pump‘s electricaldata does not match that ofthe mains supplyè Check the electrical installation.Tab. 43: Type of fault: No stroke movement observedPossible cause RemedyPressure peaks due toaccel eration with long suctionlinesè Install a suction pressureregu lator.System back pressure toohigh (measured at dischargeconnection of dosing pump)è Clean blocked injection nozzle.è Install pulsation dampeners toreduce pressure peaks if pipesare too long.è Check function of safety valves.Tab. 43: Type of fault: No stroke movement observed13.1.5 Dosing pump delivery rate too highPossible cause RemedySuction side pressure too high(pump siphoning)è Install a back-pressure valve inthe pressure line.Pressure peaks due toaccel eration with long suctionlinesè Install a suction pressureregu lator.Tab. 44: Type of fault: Dosing pump delivery rate too high13.1.6 Diaphragm is torn or tears too oftenPossible cause RemedyShut-off valves closed è Open the shut-off valves Inspectthe dosing pump for possibledamage.Pressure peaks due toaccel eration with long suctionlinesè Install a suction pressureregu lator.The materials are not suitablefor the dosing medium beingusedè Check the resistance of thematerials.Diaphragm not screwed up tothe end stop on the dia-phragm rodè Screw a new diaphragm up to theend stop.System back pressure toohigh (measured at dischargeconnection of dosing pump)è Clean blocked injection nozzle.è Install pulsation dampeners toreduce pressure peaks if pipesare too long.è Check function of safety valves.Media sediment in dosingheadè Clean the dosing head.Tab. 45: Type of fault: Diaphragm is torn or tears too often