G9SX-SM STANDSTILL SAFEY MONITORING UNIT, from Omron Scientific Technologies, monitors standstill status for machines with varied hazardous part stop times, with no sensors required.
The G9SX-SM detects back electromagnetic force (BEMF) that is generated when the motor rotates to determine whether the motor is rotating or in a standstill condition. It determines that the motor has stopped when it detects that the BEMF falls below a set criterion, according to the manufacturer. The system operates on 24 VDC, but can monitor motors up to 480 VAC. Contact: Omron Scientific Technologies. Tel: 800-479-3658. www.sti.com