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

Setting Parameters01/02 AWB8230-1413GBPID controlThe <strong>DF6</strong> frequency inverters have PID control as st<strong>and</strong>ard. This canbe used, for example, for flow <strong>and</strong> throughput controllers withfans <strong>and</strong> pumps. PID control has the following features:• The setpoint value can be issued through the frequency inverterkeypad or through an external digital signal (fixed frequencies).Sixteen different setpoint values are possible. In addition, thesetpoint can be defined with an analog input signal (0 to 10 Vor 4 to 20 mA).• With the <strong>DF6</strong>, the actual value signal can be fed back using ananalog input voltage (up to 10 V) or an analog input current (upto 20 mA).• The permissible range for the actual value signal feedback canbe specifically matched (e.g. 0 to 5 V, 4 to 20 mA, or otherranges).• With the aid of a scale adjustment, you can match the setpointsignal <strong>and</strong>/or the actual value signal to the actual physicalquantities (such as air or water flow, temperature, etc.) <strong>and</strong>view them on the display.PID control“P” st<strong>and</strong>s for proportional, “I” for integral <strong>and</strong> “D” fordifferential. In control engineering, the <strong>com</strong>bination of these three<strong>com</strong>ponents is termed PID closed-loop control, PID regulation orPID control. PID control is used in numerous types of application,e.g. for controlling air <strong>and</strong> water flow or for controlling pressure<strong>and</strong> temperature. The output frequency of the inverter is controlledby a PID control algorithm to keep the deviation between thesetpoint <strong>and</strong> actual value as small as possible. The figure belowillustrates PID control in the form of a block diagram:G1w+a–PID+++dbxM3~cB1P1Figure 115: PID control block diagramG1:<strong>DF6</strong> frequency inverterw: Setpointx: Actual valueP1: Controlled variableB1: Measured value convertera System deviationb Inverterc Fans, pumps or similar devicesd <strong>Frequency</strong> setpoint valuehPID control is only possible after the type of setpoint value<strong>and</strong> actual value used have been defined.116