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A module that grants functional safety to drive systems

| By Mary Page Bailey and Gerald Ondrey

The SK TU4-PNS, known as the PROFIsafe module, provides comprehensive safety for the reliable operation of this company’s drive systems (photo). This PROFIsafe module is a drive-integrated solution for decentralized variable-frequency drives (VFDs) that implements functional safety within the system to stop operation and avoid potential injuries or component damage. In addition to the standard functions — STO (safe torque off) and SS1 (safe stop 1) — PROFIsafe includes additional safety features, with functions such as SLS (safely limited speed), SSR (safe speed range) and SSM (safe speed monitor) incorporated into the drive units. These functions, as well as SDI (safe direction) and SOS (safe operation stop), achieve SIL 3 (safety integrity level 3) or PLe (Performance Level 3) Category 4. — NORD Gear Corp. Waunakee, Wis.