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

Torque control by real sensorless vectorcontrol, vector control(4) Adjustment procedureMake adjustment when any of such phenomena as unusual motor and machine vibration/noise/current andovercurrent has occurred.1)Check the conditions and simultaneously change the Pr. 824 value.2)If you cannot make proper adjustment, change the Pr. 825 value and repeat step 1).Adjustment MethodSet Pr. 824 a little lower and Pr. 825 a little higher. First lower Pr. 824 and check the motor for unusual vibration/noise andovercurrent. If the problem still persists, increase Pr. 825 .Pr. 824Pr. 825Decrease the value 10% by 10% until just before unusual noise and current are improved, and set about 0.8 to 0.9of that value.Note that a too low value will produce current ripples, causing the motor to generate sound synchronizing the cycleof current ripples.Increase the current value double by double until just before an unusual noise and current does not occur, and setabout 0.8 to 0.9 of that value.Note that taking a too long time will produce current ripples, causing the motor to generate sound synchronizingthe cycle of current ripples.(5) Troubleshooting (Torque)1234Phenomenon Cause CountermeasuresTorque control is notexercised normally.When the torquecommand is small, themotor rotates in thedirection opposite to thestart signal.Normal torque controlcannot be exercisedduring acceleration/deceleration.The motor vibrates.Output torque is not linearin response to the torquecommand.(1) The phase sequence of themotor or encoder wiring iswrong.(2) The Pr. 800 Control methodselection setting is improper.(3) The speed limit value is notinput.(1) Check the wiring. (Refer to page 14)(2) Check the Pr. 800 setting. (Refer to page 75)(3) Set the speed limit value. (If the speed limit value is notinput, the motor will not rotate since the speed limitvalue is regarded as 0Hz.)(4) The torque command varies. (4)-1 Check that the command device gives a correcttorque command.(4)-2 Decrease Pr. 72 PWM frequency selection .(4)-3 Increase Pr. 826 Torque setting filter 1(5) The torque command does notmatch the inverter-recognizedvalue.(6) Torque variation due to thechange in the motortemperature.The offset calibration of the torquecommand does not match.The speed limit is activated.(When Pr. 807 = "0, 2", the speedlimit may be activated since thespeed limit value changes with thesetting of the acceleration/deceleration time in Pr. 7 and Pr. 8. )Insufficient torque.(5) Recalibrate C16 Terminal 1 bias command (torque/magnetic flux), C17 Terminal 1 bias (torque/magnetic flux),C18 Terminal 1 gain command (torque/magnetic flux), C19Terminal 1 gain (torque/magnetic flux). (Refer to page 273)(6) Select magnetic flux observer by setting Pr. 95 Onlineauto tuning selection. (Refer to page 181)Recalibrate C16 Terminal 1 bias command (torque/magneticflux) and C17 Terminal 1 bias (torque/magnetic flux). (Refer topage 273)Reduce the acceleration/deceleration time.Or, set the acceleration/deceleration time to "0". (Thespeed limit during acceleration/deceleration depends onthe speed limit during the constant speed.)Return the excitation ratio in Pr. 854 to the initial value.♦Parameters referred to♦Pr. 72 PWM frequency selection Refer to page 257Pr. 178 to Pr. 189 (input terminal function selection) Refer to page 206Pr. 800 Control method selection Refer to page 75Pr. 807 Speed limit selection Refer to page 110C16 to C19 (torque setting voltage (current) bias and gain) Refer to page 273114