FR-A701 INSTRUCTION MANUAL (Applied) - Automation Systems ...

4PARAMETERSSpecial operation and frequency control(8) Adjustment procedureParameter settingAdjust the PID control parameters, Pr. 127 to Pr. 134 and Pr. 575 to Pr. 577.Terminal settingSet the I/O terminals for PID control. (Pr. 178 to Pr. 189 (input terminalfunction selection), Pr. 190 to Pr. 196 (output terminal function selection))Turn on the X14 signalOperation(9) Calibration example(A detector of 4mA at 0°C and 20mA at 50°C is used to adjust the room temperature to 25°C under PID control.The set point is given to across inverter terminals 2-5 (0 to 5V).)StartDetermination of set pointDetermine the set point ofwhat is desired to be adjusted.Set the room temperature to 25 .Set Pr. 128 and turn on the X14 signal to enable PID control.Conversion of set point into %Calculate the ratio of the setpoint to the detector output.Detector specificationsWhen 0 4mA and 50 20mA are used, the set point 25 is 50% onthe assumption that 4mA is 0% and 20mA is 100%.Make calibration.Setting of set pointInput a voltage across terminals2-5 according to the set value %.Make the following calibration* when the target setting input (0 to 5V) anddetector output (4 to 20mA) must be calibrated.When the set point is 50%As the terminal 2 specifications are 0% 0V and 100% 5V, input 2.5Vto the terminal 2 for the set point of 50%.OperationSet the proportional band (Pr.129 ) to a slightly larger value,the integral time (Pr. 130 ) to aslightly longer time, and thedifferential time (Pr. 134 ) to"9999" (no function), and turnon the start signal.When the parameter unit is used for operation, input the set point (0 to100%) in Pr. 133.When performing operation, first set the proportional band (Pr. 129 ) to aslightly larger value, the integral time (Pr. 130 ) to a slightly longer time,and the differential time (Pr. 134 ) to "9999" (no function), and while lookingat the system operation, decrease the proportional band (Pr. 129 ) andincrease the integral time (Pr. 130 ). For slow response system where adeadband exists, differential control (Pr. 134 ) shuold be turned on andincreased slowly.Is the set point stable?YesNoParameter adjustmentTo stabilize the measured value,change the proportional band (Pr.129 ) to a larger value, the integraltime (Pr. 130 ) to a slightly longertime, and the differential time (Pr.134 ) to a slightly shorter time.Parameter optimizationWhile the measured value is stablethroughout the operating status, theproportional band (Pr. 129 ) may bedecreased, the integral time (Pr. 130 )decreased, and the differential time(Pr. 134 ) increased.Adjustment end* When calibrationis requiredUsing calibration Pr. 902 and Pr. 903 (terminal 2) or Pr. 904 and Pr. 905 (terminal4), calibrate the detector output and target setting input.Make calibration in the PU mode during an inverter stop.335