The Standstill Monitors and Time Relays by Schmersal are engineered to provide fail-safe monitoring of machine standstill and precise timing control in industrial automation systems. These devices are essential in applications where hazardous motion must cease completely before operators can safely access machinery.
Standstill monitors detect whether a machine has come to a complete stop by evaluating signals such as motor voltage, encoder pulses, or proximity sensor inputs. For example, sensorless models can directly monitor a three-phase motor by analyzing induced voltage, while other versions evaluate pulse signals from rotating components.
Once the system confirms that the machine is at standstill, the device enables safety outputs—allowing actions such as unlocking safety guards or permitting access to hazardous zones.
Time relays, on the other hand, are used to control safe delay functions. They ensure that a predefined time has elapsed after machine shutdown before enabling access, which is critical in cases involving overrun movements or residual energy.
Schmersal devices are designed with redundant safety circuits, dual-channel architecture, and integrated diagnostics, enabling reliable fault detection and compliance with safety standards such as ISO 13849-1 (up to Category 3 / PL d).
With robust construction and flexible configuration options, these modules can be easily integrated into safety circuits, control panels, and automation systems, ensuring safe and efficient machine operation.
Key Features & Specifications
• Fail-safe standstill detection using motor signals, encoders, or sensors
• Sensorless monitoring option via motor voltage (e.m.f. detection)
• Precise time delay control for safe access after machine shutdown
• Dual-channel redundant design for high safety reliability
• Integrated diagnostics (LED indicators) for quick fault detection
• Multiple safety and signalling outputs for system control
• Wide operating voltage range (approx. 24–230 VAC/DC depending on model)
• DIN rail mounting for easy installation in control cabinets
• High safety performance (up to PL d / Category 3)
• Compatible with safety interlocks, PLCs, and automation systems
Applications
Standstill Monitors and Time Relays by Schmersal are widely used in:
• Industrial automation and machine safety systems
• Conveyor and material handling equipment
• Robotic work cells and automated production lines
• Packaging and processing machinery
• Machines with overrun or residual motion risks
• Maintenance access control for hazardous equipment
The Standstill Monitors and Time Relays by Schmersal provide reliable motion monitoring and precise timing control, helping industries ensure safe machine access, reduce risk, and maintain efficient and compliant automation systems.
