Baumüller has added a freely parameterizable delay time to its new SAF 002/003 safety modules in the b maXX 5000 inverter series. The delay time is switched between a safety function and the associated Safe-Torque-Off (STO) error response. In this way, the machine mechanics are optimally protected against damage in the event of a fault and downtimes are minimized.

Typically, the safety modules are equipped with various safety functions that are used for safe monitoring when required. If, for example, a limit value violation is detected during the safe monitoring of a speed, the system reacts by triggering the STO function, which switches the drive torque-free. However, in this case, the motor may not come to a controlled standstill, i.e. it may coast to a halt.

Avoiding danger and increasing productivity
Baumüller has now developed an innovation for the SAF 002/003 safety modules: The parameterizable delay time is an individually programmable time window, depending on the safety function, which is switched between the safety functions and the STO function.

Embroidery machine use case
A typical area of application for this function is the textile industry, for example. If a machine operator moves within the danger zone of a machine, the machine can automatically start safe monitoring and reduce the speed (SLS). If the active SLS speed monitoring detects that the set speed limit has been exceeded, the safety module automatically switches on the previously parameterized delay time before triggering the STO function. The controller receives the signal to remove the needle from the fabric within this time before STO is executed and the drive is switched torque-free. This functionality can prevent needle breakage or an error in the embroidery pattern, for example, and production can be resumed quickly. as