Vibration frequency 2000 to 2300 RPM. During start up and shut down, the eccentrics are phase uncoupled to prevent any vibration when the operating frequency is below 33 Hz, making this system ideal for working in close proximity to buildings or on sites that are sensitive to vibration, and enables the machine to be used with a telescopic crane. This technology also allows the amplitude and vibration speed to be adjusted while in operation.