ASDA-A2 series has built-in resonance suppression function (two groups of auto notch filters and one group of manual notch filter) to suppress the mechanical resonance effectively. When the mechanical resonance occurs, the user can set P2-47 to 1 (Auto Resonance Suppression Mode) to detect the existing resonance frequency first. After the resonance frequency is found, ASDA-A2 series will execute the suppression immediately. In the meanwhile, a noise may be heard shortly. After the noise has disappeared, it indicates that the suppression is completed and the system will memorize the resonance frequency into parameters P2-43, P2-44 and P2-45, P2-46 automatically. If only one resonance frequency is found, the system will memorize it into P2-43 and P2-44. When the mechanical resonance is reduced, the user needs to set P2-47 to 0 to disable the resonance suppression function. If the resonance conditions can not be eliminated after two groups of auto notch filters are used, we recommend the user to use the 3rd group of notch filter, i.e. the manual notch filter P2-23, P2-24. To use manual notch filter function, activate ASDA-A2 Soft configuration software first. Then, select Tools > Data Scope function from the menu bar to monitor the motor current, measure the current waveform and calculate the cycle between two resonance points. Next, take the reciprocal of the value of the cycle and the calculation result is the resonance frequency. Then, enter the value of the resonance frequency into P2-23 and set appropriate resonant attenuation in P2-24 to suppress the mechanical resonance. In general, the resonance attenuation is set to 5dB. The user can increase the value by 2dB at every time until the mechanical resonance is eliminated.