products

The speed measurement and overspeed protection systems DOPS and DOPS AS serve the measurement of speeds and the protection of inadmissible overspeeds at rotating machines. The DOPS systems in combination with safety shut-off valves are suitable to replace older mechanical overspeed protection systems.

With the consistent three channel design, starting with the signal detection via signal processing up to the evaluation of the measured speed, the system offers the maximum safety for the machines to be monitored.

Safety relevant limit values (e.g. overspeed limits) are submitted to the post-connected fail-safe technique.

Thus it can be ensured that beside operational safety, the protection function on a high level standard is met as well. The integrated peak value memory permits reading out the maximum speed value that has occurred before the machine was switched off. This function provides important information for evaluating the mechanical machine load caused by the overspeed.

Alarm outputs and error messages are output as potentialfree relay outputs and as shortcircuit proof +24 V voltage outputs. The alarm outputs, combined in 2 out of 3 logic, are also available as potential free relay contacts.

The system includes an extended fault detection function. The three speed sensors are continuously checked on operating within the permitted limits. Moreover, the channels mutually check and supervise the output signals of each other. If the internal fault detection circuit detects an error, this will be indicated via the output contacts and shown on the display as plaintext.

By means of the the PROFIBUS DP interface the recorded data can be passed on to host computers. By using prefabricated connection cables and screw terminals, the systems may be integrated economically in 19“ cabinets.