Schmersal AZR31S1 Standstill Monitor

Schmersal AZR31S1/110VAC is a sensor-free standstill monitor that directly connects to a three-phase motor and determines standstill by evaluating the motor’s EMF, providing a robust safety solution for restart control. This fail-safe safety-monitoring module supplies three safety contacts (STOP 0) and one signaling output to feed safety circuits, with clear status indicators for fault and operation to help verify safe conditions before re-energizing a machine. No target-value adjustments are required during commissioning, simplifying setup, and it is designed to work with frequency converters; its interface supports rotary hysteresis 0–1000 Hz, end-level switching frequencies up to 16 kHz, and a motor voltage range of 0–400 V. The AZR31S1/110VAC is documented to comply with relevant safety directives and standards, including the Machinery Directive (2006/42/EC), EMC Directive (2014/30/EU), RoHS (2011/65/EU), and standards EN 60947-5-1:2017, EN ISO 13849-1:2015, and EN ISO 13849-2:2012.