Vega VEGAMET 391 Operating Instructions Manual
Also see for VEGAMET 391: Operating instructionsOperating instructionsSupplementary instructionsOperating instructionsOperating instructions
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Contents
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Switched-on time ". If a considerable difference between the pumps isdetermined, it means the capacity of one of the pumps must havefallen considerably. This information can be consulted for diagnosisand service, e.g. to recognize plugged-up filters or worn out bearings.Since in this case all pumps are operated alternately in the same area,their switch-on and switch-off points should theoretically be set thesame. However, this would cause all relays to always switch on or offtogether. To achieve suitable switching characteristics, one relay mustbe assigned the desired switching points; the other relays areassigned switching points that are never reached in normal operation,e.g. 110 % and -10 %.Note:The index of the lastly switched on relay is not saved in case of voltageloss, this means that adter switching on the signal conditioninginstrument, always the relay with the lowest index starts.8.4 Tendency recognitionThe function of the tendency recognition is to recognize a definedchange within a certain time period and to transfer this information to arelay output.The information for tendency recognition is generated out of themeasured value change per time unit. The output variable is alwaysthe measured value in percent. The function can be configured forrising and falling tendency. The actual measured value is determinedand summed with a sample rate of a second. After the max. reactiontime, the average value is generated out of this sum. The realmeasured value change results then of the newly calculated averagevalue less the previously calculated average value. If this differenceexceeds the defined percentage value, the tendency recognitionresponds and the relay deenergises.Note:The activation and configuration of the tendency recognition requiresPACTware with the suitable DTM. Setting parameters via theintegrated indicating and adjustment unit is not possible.l Measured value change higher: Measured value change pertime unit, at which the tendency recognition should respondl Max. reaction time: Time after which a new measured valuegeneration is carried out and the measured value change isrecalculatedl Hysteresis: is automatically always 10 % of the value of"Measured value change more than"l Reaction in case of failure: In case of a failure, the relay goesinto the defined conditionFunctional principlePrinciple of operationParameter46 VEGAMET 391 • 4 … 20 mA/HART signal conditioning instrument8 Application examples36032-EN-091116 |
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