Safety Chain Zero-Speed Detection Solution for High-Inertia Machines

This document describes a safety chain solution for guarding high-inertia machines, achieving Performance Level e and SIL 3. It details a zero-speed detection function that uses solenoid locking interlock switches, redundant contactors, and a safety module to prevent guard unlocking until the motor has come to a complete standstill, while also monitoring wiring continuity and contactor faults.