6.7 Vibration Suppression Function (Fn205)6-516 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) or use another method to increase the responsiveness after performingthis function.(1) Before Performing Vibration Suppression FunctionCheck the following settings before performing the vibration suppression function.a) A message (NO-OP) indicating that no operations are possible will be displayed, if all of the followingconditions are not met.• The control must be set to position control.• The tuning-less function must not be enabled.• Test without motor function must not be enabled. (Pn00C.0 = 0)b) Observe the following condition to ensure operation.• The write prohibited setting (Fn010) must not be set.(2) Items Influencing PerformanceIf continuous vibration occurs when the motor is not rotating, the vibration suppression function cannot beused to suppress the vibration effectively. If the result is not satisfactory, perform anti-resonance controladjustment function (Fn204) or one-parameter tuning (Fn203).(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).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 this function. If the setting greatly differs from the actual moment of inertia ratio, normal controlof 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 vibration.• If vibration frequencies automatically detected are not suppressed, the actual fre-quency and the detected frequency may differ. Fine-tune the detected frequency ifnecessary.
