Vega VEGAMET 391 Operating Instructions Manual
Also see for VEGAMET 391: Operating instructionsOperating instructionsSupplementary instructionsOperating instructionsOperating instructions
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volume should be at 90 % level, these are 9538 litres with a standardvessel (according to bearing chart). The min. level should be adjustedto 5 %, this corresponds to 181 litres. The volume should be displayedin litres.Carry out the adjustment in the signal conditioning instrument asdescribed in chapter "Setup steps". No additional adjustment musthence be carried out on the sensors. For the max. adjustment, fill thevessel up to the requested max. level and accept the actuallymeasured value. If this is not possible, the respective current value canbe entered alternatively. For the min. adjustment, empty the vessel upto the min. level or enter the respective current value.To display the percentage level correctly, select under "Measurementloop - Linearization curve" the entry "Cylindrical tank".The display the volume in litres, you have to enter under "Measure-ment loop - Scaling" as unit "Volume" in litres. Finally, the allocation iscarried out, in this example 100 % ≙ 10000 litres and 0 % ≙ 0 litres.Percent is selected as reference value for the relays. The mode ofrelay 1 is set to overfill protection, relay 2 gets mode dry run protection.To ensure that the pump switches off in case of failure, the reaction incase of failure should be adjusted to switching status OFF. Theswitching points are adjusted as follows:l Relay 1: Switch off point 90 %, switch on point 85 %l Relay 2: Switch off point 5 %, switch on point 10 %Information:The switch on and off point of the relays must not be adjusted to thesame switching point because this would cause a permanent switchinon and off when this threshold is reached. To avoid this effect also withfluctuating product surface, a difference (hysteresis) of 5 % is usefulbetween the switching points.8.2 Pump control 1/2 (running time controlled)Pump control 1/2 is used to control several pumps with the samefunction dependent on the previous running time. The pump with theshortest running time is always switched on and the pump with thelongest running time switched off. In case of higher requirements, allpumps can also run at the same time dependent on the enteredswitching points. Through this measure, a balanced utilization of thepumps is achieved and the reliability increased.All relays with activated pump control are not assigned to a certainswitching point but are switched on or off depending on the operatingtime. The signal conditioning instrument selects the relay with theshortest operating time when the switch-on point is reached, and therelay with the longest operating time when the switch-off point isreached.OperationLinearisationScalingRelayFunctional principle42 VEGAMET 391 • 4 … 20 mA/HART signal conditioning instrument8 Application examples36032-EN-091116 |
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