Kendrion introduces the FIO Drive Control STO, marking its first integration of a SIL 3/PL e-certified Safe Torque Off (STO) function into the modular FIO drive solution. This compact 4-quadrant servo drive for stepper and BLDC motors incorporates the dual-channel STO directly into the module, allowing safe torque shutdown without needing an extra STO module. The module, measuring only 25 × 120 × 90 millimeters, can be compactly mounted on a DIN rail. In the event of a safety trigger, the output power is safely cut off within a few milliseconds through two independent channels. EtherCAT communication and logic power remain operational, maintaining position and communication status. After the safety circuit is released, the drive can restart immediately without rebooting or rehoming, reducing restart times after a safety stop and minimizing machine downtime.
Safety and drive control in a single module
Besides the certified STO function, the FIO Drive Control STO offers extra features for compact drive systems. It includes an integrated power output that allows direct control of holding magnets, locking mechanisms, or parking brakes, minimizing the need for additional electronics. Depending on the application, the drive can function sensorlessly or employ standard encoder interfaces for applications requiring higher positioning accuracy. The goal during development of the module was facilitating compact machine concepts with less additional hardware.
