If the stiffness of the mechanical system is not sufficient after the positioning command is completed, continuous vibration of the mechanical system may still occur even when the motor has nearly stopped. We called this kind of vibration “low-frequency vibration”. At this time, you can use the low-frequency vibration suppression function to minimize the vibration at the machine edges. The range of frequency is from 1.0 to 100.0Hz. Please note that low-frequency vibration suppression is available only in ASDA-A2 series servo drives. There are two modes, Auto and Manual, that you can select: (1) Auto mode If it is difficult for you to know the point where the low-frequency vibration occurs, we recommend that you select auto mode to find the low-frequency of the mechanical vibration automatically. When P1-29 is set to 1, the system disables the filter function and finds the low vibration frequency automatically. After the detected frequency becomes fixed and stable, the system sets P1-29 to 0, saves the first measured low-frequency value automatically into P1-25 and sets P1-26 to 1. Next, the system saves the second measured low-frequency value automatically into P1-27 and sets P1-28 to 1. If any low-frequency vibration occurs after P1-29 is automatically set to 0, check if the function of P1-26 or P1-28 is enabled or not. When P1-26 or P1-28 is set to 0, it indicates that there is no vibration frequency detected. Please decrease value set in P1-30 (Low-frequency Vibration Detection Level) and set P1-29 to 1 to find the low-frequency vibration again. (2) Manual mode There are two groups of low-frequency vibration suppression parameters. The first group is P1-25 and P1-26 and the second group is P1-27 and P1-28. Using these parameters you can suppress the vibration of two different low frequencies and improve system performance. P1-25 and P1-26 set the vibration frequency, and P1-26 and P1-28 set the frequency response after the filter is used (after the signals are filtered). When values set in P1-26 and P1-28 are higher, the frequency response is faster. However, if the values are too high, they may affect the motor operation and the motor might not run smoothly. The default settings for P1-26 and P1-28 are 0, indicating that the low-frequency vibration suppression is disabled.