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

4PARAMETERSAdjustment of real sensorless vectorcontrol, vector control4.7 Adjustment of real sensorless vector control, vector controlPurpose Parameter that should be Set Refer to PageStabilize speed and feedback signalSpeed detection filterTorque detection filterPr. 823, Pr. 827, Pr. 833, Pr. 837 127Change the excitation ratio Excitation ratio Pr. 854 1284.7.1 Speed detection filter and torque detection filter (Pr. 823, Pr. 827, Pr. 833, Pr.837)SensorlessVectorSet the time constant of the primary delay filter relative to the speed feedback signal and torque feedback signal.Since this function reduces the speed loop response, use it with the initial value.ParameterNumberName Initial Value Setting Range Description823 *1 Speed detection filter 1 0.001s827 Torque detection filter 1 0s833 *1 Speed detection filter 2 9999837 Torque detection filter 2 9999*1 This parameter can be set when the FR-A7AP (option) is mounted.(1) Stabilize speed detection (Pr. 823, Pr. 833 )⋅ Since the current loop response reduces, use it with the initial value.Increase the setting value gradually and adjust the value to stabilize the speed when speed ripples occur due toharmonic disturbance, etc. A too large value will run the motor unstably.⋅ Pr. 823 and Pr. 833 are valid only during vector control(2) Stabilize speed detection (Pr. 827, Pr. 837 )0 Without filter0.001 to 0.1sSet the time constant of the primary delay filterrelative to the speed feedback signal.0 Without filter0.001 to 0.1sSet the time constant of the primary delay filterrelative to the torque feedback signal.0 to 0.1sSecond function of Pr. 823 (valid when RT signal ison)9999 Same as the Pr. 823 setting0 to 0.1sSecond function of Pr. 827 (valid when RT signal ison)9999 Same as the Pr. 827 setting⋅ Since the current loop response reduces, use it with the initial value.Increase the setting value gradually and adjust the value to stabilize the speed when torque ripples occur due toharmonic disturbance, etc. A too large value will run the motor unstably.(3) Use multiple primary delay filters.⋅ Use Pr. 833 and Pr. 837 to change the filter accroding to applications. Pr. 833 and Pr. 837 are valid when the RTsignal is on.REMARKS⋅ The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 210.)⋅ The RT signal is assigned to the RT terminal in the initial setting. By setting "3" in any of Pr. 178 to Pr. 189 (input terminal functionselection) , you can assign the RT signal to the other terminal.127