Design Engineering

Virtual Sensor

B&R Safe Speed Observer for ACOPOS P3 servo drive eliminates need for encoders.

August 26, 2019   by DE Staff

B&R has developed the Safe Speed Observer, a virtual sensor for its ACOPOS P3 servo drive. The unit determines speed in accordance with SIL 2 / PL d / CAT 3 requirements, reducing the cost of implementing the Safely Limited Speed safety function by eliminating the need for a safe encoder.

From the electrical variables of a permanent magnet synchronous motor, the Safe Speed Observer calculates two redundant models of the motor – achieving a high safety level for the calculated speed. The virtual sensor can be used for both linear and rotary synchronous motors.

The Safe Speed Observer is configured in the company’s Automation Studio engineering environment via the respective encoder interface. The user can implement the safety functions available for the safe axis from the safety library.

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