Play it safe with the SD6 drive controller


A powerful new SE6 advanced safety module from STOBER integrates into the SD6 drive controller for drive integrated safety functionality

In cooperation with Pilz–Safe Automation, international power transmission and motion control specialists, STOBER, has designed a new SE6 safety module for their SD6 drive controller.

For those using, or planning to specify the SD6 drive controller, the SE6 is a new module that is easy to use and allows safe drive monitoring in safety-related applications up to SIL 3, PL e (category 4) in accordance with EN 61800-5-2 and EN ISO 13849-1. The low worst-case response time of less than ten milliseconds enables fast stopping, allowing the design engineer to keep safety distances to a minimum.

One of its highlights is safe brake management, which consists of safe brake control (SBC) and safe brake test (SBT) with test cycle monitoring.  “This enables the drive controller to fulfil the requirements of the soon to be released EN 16090-1 and is based on a publication of the German Social Accident Insurance (Deutsche Gesetzliche Unfallversicherung, or DGUV)”, explains STOBER’s Drive Controller Accessories Product Manager, Markus Frei. “The DGUV trade publication forms the basis for the draft standard DIN EN ISO 16090-1:2016-02, where the topic of protecting vertical axes is described in a standard for the first time.”

In addition to the safe torque off (STO), safe stop 1 (SS1) and safe stop 2 (SS2) stop functions, SE6 also enables functions for safe movement and safe motion monitoring. The safely limited speed (SLS) and safe speed range (SSR) functions ensure that the drive does not exceed the configured velocity limit values.

Safe direction (SDI) monitors the configured direction of motion, and safely limited increment (SLI) limits the increment reliably. Safe operating stop (SOS) monitors an active stop.

Working with Pilz–Safe Automation, the issue of real-world suitability took priority during development, and consequently, all safety functions can be used up to SIL 3, PL e (category 4).

Also, the SE6 allows the user to respond variably when a limit value is exceeded, or in the event of an emergency stop. “It is not always a good idea to shut off the drive controller immediately and perform an uncontrolled stop of the drive when a limit value is violated. For a fast and simple restart, it is usually better to deliberately stop the drive using the controller, and only to intervene with the drive controller if the controller fails to do so,” says Frei.

Special motors, encoders, cables or stall or speed sensing switches are no longer required, as the user can reuse existing drive configurations or switch to components that are suitable for the application, and reduce costs.

Featuring a consistent two-channel structure, the SE6 tests the integrated components upon every device start-up, after every STO and during operation. Cyclical function tests of safety functions that are subject to documentation at the end customer’s location can be eliminated.

The sixth generation drives from STOBER offer powerful stand-alone and multi-axis drive controllers for highly-efficient multi-axis applications. The flexible SD6 single-axis drive controller, which is part of this product family, has a nominal output current of up to 85 amps and is primarily used in drive-based applications with decentralised motion control. It also controls linear and rotational synchronous servo motors, as well as asynchronous motors.

Communication modules for CANopen, EtherCAT or PROFINET can be selected for the connection to a higher-level controller.


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