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New G9SX-SM Safety Monitoring Unit Provides Sensor-less Machine Standstill Monitoring

Omron Scientific Technologies, Inc. introduces the G9SX-SM Standstill Safety- Monitoring Unit. The G9SX-SM monitors standstill status for machines with varied hazardous part stop times, with no sensors required. The system can operate out of the box without any need for sensitivity adjustments, or users can manually adjust system sensitivity to the specific needs of each machine. Additionally, it can be used with inverter-controlled systems without any threat of malfunction due to the inverter's dynamic brake or auto-tuning functions.

When a hazard does not stop immediately it is necessary to prevent access to the hazardous area until the motion has stopped. The G9SX-SM improves productivity by minimizing the delay time caused by such hazards by sensing the stop motion instead of waiting for a count down timer to expire.

The G9SX-SM detects back electromagnetic force (BEMF) that is generated when the motor rotates to determine whether the motor is rotating or in standstill condition. It determines that the motor has stopped when it detects that the BEMF falls below a set criterion. The system operates on 24 VDC, but can monitor motors up to 480VAC. It provides 3 safety standstill detection outputs and 2 auxiliary outputs, and is available with spring-cage or screw terminal blocks. Detailed LED indicators enable easy fault diagnosis.

Standstill and low-speed monitoring is required by international standards for machine tools, printing presses and other applications. The G9SX-SM is certified to all relevant North American and International safety standards, meets Safety Category 4 (EN954-1) requirements, and is engineered to deliver reliable standstill operation in these applications.

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