here’s how it works Step 3
Step 1 The operator performs a test strip to determine CMV or Evib values to set.
Step 2
The seismic processor in the cab calculates the optimal vibratory frequency at any given time and sends that information to the vibration drive system.
The seismic sensor in the drum continuously senses the properties of the compacted material and informs the processor.
Step 5 When the seismic senses the desired degree of compaction is reached or double-jumping of the drum happens, it engages anti-bounce control and shuts off the vibration of the drum.
Step 4 The adjustable vibration drive drives the drum vibration at the correct frequency.
Dynapac’s Seismic and ABC Technology Dynapac’s newest technology was on display back at CONEXPO-CON/ AGG 2020 with the Seismic CA3500 roller with anti-bounce control (ABC) technology. This roller is designed to eliminate guesswork by automatically controlling vibratory frequency to get the best compaction rate, and then communicate with the operator to cease passes or vibration to protect against overcompaction and machine damage. Here’s how it works: When the operator begins working, the seismic technology automatically engages on machines equipped with the technology. If the operator needs to disengage the seismic, he or she merely depresses the seismic button on the control panel. Next, the seismic sensor, located within the drum, continuously senses the state of compaction. It senses the properties of the
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compacted material and informs the processor. Next, the processor with seismic functionality, located in the operator cab, calculates the optimal frequency at any given time and controls the vibration drive system. The adjustable vibration drive drives the drum vibration system at the needed frequency to achieve the desired degree of compaction. As the compaction increases in the material, so does the material property. The seismic system immediately recognizes the change and adjusts the vibration frequency accordingly. The seismic sensor will sense if double-jumping of the drum—due to overcompaction—begins. At this time, the onboard processor informs the operator with a warning and subsequently engages the ABC and shuts off the vibration of the drum to prevent material and machine damage.
The onboard display shows the operator the compaction degree measurement in terms of CMV or Evib values. The operator sets the target for CMV or Evib value after performing a test strip at the desired compaction degree. Then this value becomes the reference value for the job site; compaction is carried out to reach this level. For more information, contact Isaac Torres at (800) 651-0033 or isaac.torres@dynapac.com.
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