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

4PARAMETERS(5) Manual input speed control gain adjustmentSpeed control by real sensorless vectorcontrol, vector control· Make adjustment when any of such phenomena as unusual machine vibration/noise, low response level andovershoot has occurred.Proportional gain200rad/s120rad/s60% 100%(initial value)Pr. 820Setting· When there is load inertia, the actual speed gain is as given below.· Pr. 820 Speed control P gain 1 = "60%" (initial value) is equivalent to120rad/s (speed responce of the motor alone). Increasing thesetting value improves the response level, but a too large gain willproduce vibration and/or unusual noise.· Decreasing the Pr. 821 Speed control integral time 1 shortens thereturn time taken at a speed change. However, a too short time willgenerate an overshoot.LoadfluctuationSpeedSince increasing the proportional gain enhances theresponse level and decreases the speed fluctuation.Decreasing the integral time shortens the return time taken.Actual speed gain = speed gain of motor without load ×JMJM+JLJM: Inertia of the motorJL: Motor shaft-equivalent load inertia· Adjustment procedures are as below:1)Check the conditions and simultaneously change the Pr. 820 value.2)If you cannot make proper adjustment, change the Pr. 821 value and repeat step 1).No.12Phenomenon/ConditionLoad inertiais largeVibration/noisegenerated frommechanical system3 Slow response45Long return time(response time)Overshootor unstablephenomenon occurs.Adjustment MethodSet the Pr. 820 and Pr. 821 values a little higher.When a speed rise is slow, increase the value 10% by 10% until just beforePr. 820vibration/noise is produced, and set about 0.8 to 0.9 of that value.If an overshoot occurs, double the value until an overshoot does not occur, andPr. 821set about 0.8 to 0.9 of that value.Set the Pr. 820 value a little lower and the Pr. 821 value a little higher.Decrease the value 10% by 10% until just before vibration/noise is not produced,Pr. 820and set about 0.8 to 0.9 of that value.If an overshoot occurs, double the value until an overshoot does not occur, andPr. 821set about 0.8 to 0.9 of that value.Set the Pr. 820 value a little higher.When a speed rise is slow, increase the value 5% by 5% until just beforePr. 820vibration/noise is produced, and set about 0.8 to 0.9 of that value.Set the Pr. 821 value a little lower.Decrease the Pr. 821 value by half until just before an overshoot or the unstable phenomenondoes not occur, and set about 0.8 to 0.9 of that value.Set the Pr. 821 value a little higher.Increase the Pr. 821 value double by double until just before an overshoot or the unstablephenomenon does not occur, and set about 0.8 to 0.9 of that value.REMARKS· When making manual input gain adjustment, set "0" (without easy gain tuning) (initial value) in Pr. 819 Easy gain tuningselection.· Pr. 830 Speed control P gain 2 and Pr. 831 Speed control integral time 2 are made valid when the RT terminal is switched on. Makeadjustments in the same way as Pr. 820 and Pr. 821.91