Hardware and Engineering DF6-340-... Frequency ... - Moeller.com.tr

01/02 AWB8230-1413GB PID controlStructure <strong>and</strong> parameters of the PID controllerPID control active/inactive<strong>DF6</strong> frequency inverters can work in one of the following twocontrol modes:• <strong>Frequency</strong> control active (i.e. PID control inactive)• PID control activeYou can change over between the two modes with PNU A071 (PIDcontrol active/inactive).In addition, you can switch PID control off by activating a digitalinput configured as PID (a section “Activate/deactivate PIDcontrol Reset PID <strong>and</strong> integral <strong>com</strong>ponent (PIDC)”, page 92).PNU Name Adjustable in RUN mode Value Function WENormalExtendedA071PID controlactive/inactive– j 00 PID control is not used (inactive) 0001 PID control is used (active)<strong>Frequency</strong> control is the st<strong>and</strong>ard control method used by manyfrequency inverters. A setpoint value is defined by a control unit(keypad) as an analog voltage or current signal, or through a fourbit wide digital <strong>com</strong>m<strong>and</strong> applied to the control signal terminals.With PID control, the inverter’s output frequency is controlled by acontrol algorithm to ensure that the deviation between thesetpoint <strong>and</strong> actual value is kept at zero.ParametersThe following figure illustrates which parameters are effective indifferent areas of the PID block diagram. The specified parameters(such as PNU A072) apply to the frequency inverter’s built-inkeypad:PNU A075PNU F001wPNU A01abPNU A075 -1+x–P: PNU A072I: PNU A073D: PNU A074+++f OPNU A012(PNU A076)PNU A075PNU d004PNU A0110 PNU A013PNU A014Figure 122: PID control parametersw: Setpointx: Actual valuef o : Output frequencya <strong>Frequency</strong> definition through: keypad, fixed frequenciesb Analog definition through: potentiometer, analog inputs,current or voltage119