Schmersal RST36-1 Safety relays

Schmersal RST Series Safety Relays (General Overview, Likely applicable to RST36-1)

Schmersal is a leading manufacturer of safety switching devices and systems. Their "RST" series most likely refers to safety relays or safety modules designed to implement safety functions in machinery and plant engineering. These devices are crucial components in safety chains, ensuring that hazardous movements are safely stopped or prevented in the event of an emergency or when safety guards are opened.

Product Detailed Description (General for Schmersal Safety Relays)

• Function:

• Monitoring Safety Devices: Safety relays monitor the status of safety devices such as emergency stop buttons, safety light curtains, safety interlock switches (e.g., on guards and doors), and two-hand controls.

• Safe Output Switching: When a safety device is activated (e.g., emergency stop pressed, guard opened), the safety relay reliably de-energizes dangerous outputs (e.g., motor contactors) to bring the machine to a safe state.

• Redundancy and Self-Monitoring: Designed with redundant, self-monitoring circuitry to ensure that even in the event of a single fault within the relay itself, the safety function is maintained or a safe state is achieved. This typically involves dual channels and internal monitoring.

• Feedback Loop Monitoring: Many safety relays include a feedback loop to monitor the status of the external contactors or actuators they control, ensuring that the power to the hazardous machine part has indeed been removed.

• Reset Functionality: Offers various reset options (manual, automatic, monitored) for resuming operation only after the hazard is cleared and the safety circuit is confirmed to be ready.

• Features:

• Conforms to Safety Standards: Designed and certified to meet international safety standards such as ISO 13849 (Performance Level - PL) and IEC 62061 (Safety Integrity Level - SIL).

• Modular Design: Often available in compact, modular housings for DIN rail mounting, allowing for flexible system expansion.

• Multiple Inputs/Outputs: Can feature various safety inputs (for different safety devices) and safety outputs (NO/NC contacts) for controlling external contactors.

• LED Indicators: Diagnostic LEDs provide clear status indication of inputs, outputs, and internal faults, simplifying troubleshooting.

• Removable Terminals: Some models feature removable screw or spring clamp terminals for easier wiring and maintenance.

Product Parameters (General for Schmersal Safety Relays)

(Specific values for RST36-1 are unavailable, but here are typical parameters for safety relays in this class):

• Safety Category / Performance Level (PL): Up to PLe / Category 4 according to ISO 13849-1.

• Safety Integrity Level (SIL): Up to SIL 3 according to IEC 62061.

• Rated Control Supply Voltage (Us): Typically 24 VDC, 24 VAC/DC, 110-230 VAC (depending on model).

• Power Consumption: Varies (e.g., 2 W to 5 W).

• Safety Outputs: Number and type of NO (Normally Open) safety outputs (e.g., 2 NO, 3 NO).

• Auxiliary Outputs: Number and type of NC (Normally Closed) auxiliary outputs (for signaling, not safety-related).

• Rated Switching Current (Safety Contacts): Varies (e.g., 4A, 6A resistive load).

• Input Circuits: Number of safety inputs (e.g., 1 or 2-channel control), monitored feedback loop.

• Reset Type: Manual, Automatic, Monitored Manual.

• Response Time: Typically < 20 ms (time from input change to safe output state).

• Enclosure Material: Thermoplastic (often fiberglass-reinforced).

• Mounting: DIN rail mount (35 mm).

• Degree of Protection: Typically IP20 (terminal side), IP40 (housing).

• Operating Temperature Range: Typically -25 °C to +60 °C.

• Connection Type: Screw terminals or Spring-clamp terminals.

Product Advantages (General for Schmersal Safety Relays)

• High Safety Level: Designed to meet stringent international safety standards (PLe, SIL3), ensuring maximum personnel and machine safety.

• Reliable Performance: Redundant and self-monitoring circuitry minimizes the risk of dangerous failures.

• Versatile Application: Can be used with a wide range of safety devices and integrated into various safety circuits.

• Easy Diagnostics: LED indicators simplify troubleshooting and reduce downtime.

• Robust Construction: Built for industrial environments, offering long-term durability.

• Space-Saving: Compact designs for efficient use of panel space.

• Simplified Wiring: Often features clearly marked and sometimes removable terminals for easier installation.

• Reputable Brand: Schmersal is known for its expertise and quality in industrial safety.

Precautions (General for Schmersal Safety Relays)

• Correct Selection: Always choose the safety relay that matches the required Safety Performance Level (PL) or Safety Integrity Level (SIL) for your specific machine's risk assessment. Ensure compatibility with the safety devices being monitored (e.g., 2-channel input for Category 3/4).

• Proper Installation: Install the safety relay according to the manufacturer's instructions and relevant national/international standards (e.g., EN ISO 13849, EN 60204). Ensure proper wiring, grounding, and enclosure protection.

• Correct Wiring: Pay close attention to wiring diagrams. Incorrect wiring can compromise the safety function. Ensure safety inputs are correctly wired as 1-channel or 2-channel, and the feedback loop (if used) is correctly connected.

• Commissioning and Validation: After installation, a thorough functional test and validation of the entire safety circuit are mandatory before operation.

• Regular Testing and Maintenance: Safety relays and the entire safety circuit must be regularly inspected and functionally tested as per safety standards and manufacturer recommendations to ensure continued safe operation.

• Environmental Conditions: Ensure the operating environment (temperature, humidity, vibration) is within the specified limits.

• Avoid Bypassing: Never attempt to bypass or tamper with safety circuits, as this defeats the safety function and poses extreme hazards.

• Qualified Personnel: Installation, commissioning, and maintenance should only be performed by qualified and authorized personnel.

Product Applications (General for Schmersal Safety Relays)

Schmersal safety relays are indispensable in any industrial application where machine safety is paramount.

• Machine Guarding: Monitoring safety gates, doors, and covers using interlock switches.

• Emergency Stop Systems: Implementing reliable emergency stop functions for immediate machine shutdown.

• Light Curtains and Scanners: Interfacing with photoelectric safety light curtains and safety laser scanners to detect personnel entry into hazardous areas.

• Two-Hand Control Applications: Ensuring operators use both hands to initiate dangerous machine movements.

• Pressure Sensitive Mats/Edges: Monitoring the status of pressure-sensitive safety devices.

• General Industrial Machinery: Used in manufacturing, packaging, assembly lines, robotics, and other automated systems to create and monitor safety functions.

• Process Control: In industries like chemical, pharmaceutical, and food processing, to ensure safe operation of pumps, valves, and mixers.

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