5.7 Vibration Suppression Function (Fn205)5-455 Adjustments5.7 Vibration Suppression Function (Fn205)The vibration suppression function is described in this section.5.7.1 Vibration Suppression FunctionThe vibration suppression function suppresses transitional vibration at frequency as low as 1 to 100 Hz that isgenerated mainly when positioning if the machine stand vibrates.(1) Check Points for SettingsBefore performing the vibration suppression function, check the following setting and take necessary mea-sures.• The control must be set to position control.(2) Items Influencing PerformanceThe vibration suppression function cannot suppress vibration effectively under the following condition. If theresult is not satisfactory, perform anti-resonance control adjustment function (Fn204) or one-parameter tuning(Fn203).• Vibration is generated continuously when the motor is not rotating.Perform one-parameter tuning (Fn203) to improve responsiveness after vibration suppression is performed.(3) Detection of Vibration FrequenciesNo frequency detection may be possible if the vibration does not appear as a position error or the vibrationresulting from the position error is too small.The detection sensitivity can be adjusted by changing the setting for the remained vibration detection width(Pn560). Perform the detection of vibration frequencies after adjusting the remained vibration detection width(Pn560).Note: Use a set value of 10% as a guideline. The smaller the set value is, the higher the detection sensitivity will be. If thevalue is too small, however, the vibration may not be detected accurately.CAUTION• If this function is executed, related parameters will be set automatically. Therefore, there will be a largeresponse change after this function is enabled or disabled. Enable the function in a state where themachine can come to an emergency stop at any time to ensure the safety operation of the machine.• Be sure to set a suitable value for the mass ratio (Pn103) using advanced autotuning before executingthis function. If the setting greatly differs from the actual mass ratio, normal control of the SERVOPACKmay not be possible, and vibration may result.• Frequency detection will not be performed if there is no vibration resulting from posi-tion errors or the vibration frequencies are outside the range of detectable frequen-cies. If that occurs, use a device, such as a laser displacement sensor or vibrationmeter, to measure the vibration.• If vibration frequencies automatically detected are not suppressed, there may be a dif-ference between the actual frequency and detected frequency. Fine-tune the detectedfrequency if necessary.Pn560Remained Vibration Detection Width ClassificationSetting Range Setting Unit Factory Setting When Enabled0.1 to 300 0.1% 40 Immediately SetupPosition
