Frequency Inverter DF51... - Moeller.com.tr

Setting parameters04/07 AWB8230-1541GBConfiguring PID controlhActual valueProcess variable (PV = actual value x) feedback requires an analoginput:• voltage signal: 0…+10 V H a input O or• current signal: 4…20 mA a input OI.The selection is made with PNU A076 and also assigns the other,previously unassigned, analog input as reference value input (ifPNU A001 = 01).hReference valueThe analog reference value input is automatically assignedthrough the selection of the analog actual value input. In additionto this automatic assignment, you can select other reference valuesources with PNU A001.PNU A001For examples for reference/feedback value input with PIDcontrol and for inverted PID control, seea section“Beispiele zur Soll-/Istwertvorgabe beim PID-Regler” onpage 1.Analog reference/feedback values input interfacing atterminals “O” (0…+10 V) and “OI” (4…20 mA) alwaystakes place with a positive signal.Reference value source00 Potentiometer of the LCD keypad02 Input through PNU F001 or as fixed value PNU A020 toA035 (binary-encoded selection FF1 to FF4 throughdigital input 1 to 6).03 Serial interface (Modbus)10 Calculator (calculated value of CAL)The fixed values (PNU A020 to A035) have priority over all otherreference value sources.The reference values are given as a percentage (0 to 100 %)except for PNU F001 and the fixed values PNU A020 to A035,which are given as specified in PNU A075.Output limitation (PNU A078)The PID controller has an automatic output limit function. Itmonitors the percentage deviation of the manipulated variable(output frequency) from the control difference (e = reference value– actual value). You can specify the limit value with PNU A078.This setting can be made only at the lower and upper operatingfrequency limits (a section “Minimale und maximaleBetriebsfrequenz”, page 2).%A078A078bFigure 140: PID control – limitation of minimum output frequencya Limitation activeb System deviation (reference value – actual value)A078: Percentage limit value.aa• If the system deviation (reference value – actual value) is lessthan or equal to the value set with PNU A078, the controllerworks within its normal, linear range.• If the system deviation is greater than the value set withPNU A078, the controller changes the output frequency so thatthe limit value is not reached.• The polarity of the system deviation can be set PNU A077.Inversion (PNU A077)In typical control applications, such as heating and ventilationcontrol systems, an increase in power consumption is the result ofa rising actual value (system deviation = reference value minusactual value). In cooling systems, increased power consumptionresults from a falling (negative) actual. With PNU A077 you canset the polarity of the system deviation.Display factor (PNU A075)When PID control is enabled (PNU A071 = 01), the reference andactual values be<strong>com</strong>e process variables and are automaticallyconverted into percentages. The specified reference value(0…100 %) corresponds with, for example, a volume flow rate(0…50 m 3 /h). The process variable (PV) is the reading (m 3 /h) froma sensor and is again evaluated as a percentage (0…100 %).With PNU A075 you can scale the displayed value so that theprocess data is displayed in its physical units, in this case m 3 /h. Thereference value is output at PNU F001 and the actual value atPNU d001.t130