6.7 Vibration Suppression Function (Fn205)6-536 Adjustments6.7 Vibration Suppression Function (Fn205)The vibration suppression function is described in this section.6.7.1 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.This function is set automatically when advanced autotuning or advanced autotuning by reference is executed.In most cases, this function is not necessary. Use this function only if fine-tuning is required or readjustment isrequired as a result of a failure to detect vibration.Perform one-parameter tuning (Fn203) if required to improve the response characteristics after performingthis function.(1) PreparationCheck the following settings before performing the vibration suppression function.The message “NO-OP” indicating that the settings are not appropriate will be displayed, if all of the followingconditions are not met.• The control must be set to position control.• The tuning-less function must be disabled (Pn170.0 = 0).• The test without a motor function must be disabled (Pn00C.0 = 0).• The write prohibited setting parameter (Fn010) must be set to Write permitted (P.0000).(2) Items Influencing PerformanceIf continuous vibration occurs when the servomotor is not rotating, the vibration suppression function cannotbe used to suppress the vibration effectively. If the result is not satisfactory, perform anti-resonance controladjustment function (Fn204) or one-parameter tuning (Fn203).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 moment of inertia ratio (Pn103) using advanced autotuning beforeexecuting the vibration suppression function. If the setting greatly differs from the actual moment of inertiaratio, normal control of the SERVOPACK may not be possible, and vibration may result.• This function detects vibration frequency between 1 to 100 Hz. Vibration will not bedetected for frequencies outside of this range, and instead, "F-----" will be displayed.• Frequency detection will not be performed if no vibration results from position error orthe vibration frequencies are outside the range of detectable frequencies. If so, use adevice, such as a displacement sensor or vibration sensor, to measure the vibrationfrequency.• If vibration frequencies automatically detected are not suppressed, the actual fre-quency and the detected frequency may differ. Fine-tune the detected frequency ifnecessary.
