SHGV/B1.1/x1x+x3x Multi-Channel Safety Relay Module Industrial Automation EN 61508

1. Product Overview

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The Schmersal SHGV/B1.1/x1x+x3x is a robust and self-contained rope-operated emergency stop system designed for medium-sized machinery requiring accessible emergency triggering and localized, authorized reset. Unlike more complex variants with separate reset modules, this model integrates the control logic and ​manual reset mechanism​ directly into the ​SHGV/B1.1 control unit​ (x1x), paired with a ​SHGV...x3x rope tensioner unit. It utilizes a durable stainless steel wire rope installed along hazardous machine zones, allowing personnel to instantly stop operations by pulling the wire anywhere along its length. Engineered for industrial environments, the control unit features a rugged polycarbonate or metal enclosure typically rated at ​IP65​ for protection against dust and water jets, while the tensioner boasts corrosion resistance. The integrated reset knob ensures restart capability only occurs directly at the control point after an emergency event is resolved.

​2. Key Technical Parameters

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The SHGV/B1.1/x1x control unit operates at a standard ​control voltage of 24V DC​ (common range 24V DC to 230V AC for certain configurations). It houses ​force-guided, positively driven safety contacts​ configured as dual-channel ​Normally Closed (NC)​, essential for achieving high safety ratings (typically ​ISO 13849-1 PL d, SIL CL 3 per IEC 62061). Standard contact ratings are ​6A / 250V AC or 10A / 24V DC. The ​x1x​ suffix specifies options including voltage supply type, cable entries (M20/M25 glands), and auxiliary contacts. The ​x3x​ tensioner unit suffix defines rope material (stainless steel standard) and includes ​critical rope condition contacts​ signaling "Rope Tensioned" or "Rope Slack" states. Wire lengths are customizable, often supporting runs ​up to 100 meters. Both units exhibit high mechanical endurance (>1 million cycles) and operate reliably within an ambient temperature range of ​​-30°C to +70°C.

​3. Primary Applications and Use Cases

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This system is ideal for safeguarding ​conveyor sections, ​packaging lines, ​material transfer stations, ​robotic workcells, and ​medium-sized presses​ where continuous emergency stop access is required, but centralized or monitored reset authorization is not mandated. It allows workers to rapidly halt machinery from any position along the protected hazard zone, such as long stretches of conveyors in manufacturing plants or logistics hubs. Applications include preventing injuries near nip points, rotating equipment, or moving platforms in industries like automotive, food processing, and general assembly. The localized manual reset function (/B1.1) suits controlled environments where restart supervision at the emergency point is feasible. It’s particularly valuable where full perimeter guarding requires numerous access points but the safety risk level allows for PL d (ISO 13849-1) solutions. The rope condition monitoring ensures integrity across extended installations.

​4. Product Advantages and Functional Benefits

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The SHGV/B1.1/x1x+x3x offers significant safety and operational benefits. Its ​all-in-one control/reset design simplifies installation​ and reduces component costs compared to modular reset systems. ​Continuous rope accessibility​ ensures rapid E-stop response, vastly improving personnel safety over discrete buttons. The ​integrated mechanical reset knob​ requires physical operator intervention at the control unit, preventing unsafe automatic restarts and fulfilling fundamental safety requirements. The ​force-guided dual-channel NC contacts​ provide high diagnostic coverage against dangerous failures (e.g., contact welding). ​Robust IP65-rated housings​ ensure reliable operation in harsh environments with dust, moisture, or vibrations. ​Rope condition monitoring (x3x signals)​​ enables proactive maintenance, reducing downtime and preventing undetected safety system degradation. Standard ​compliance with IEC/EN 60947-5-1​ simplifies machine certification. Its ​compact footprint​ eases integration into space-constrained areas.

​5. Core Functionality and Reset Mechanism

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Operation centers on ​rope tension integrity. The stainless steel rope, anchored at ends, is kept taut by the spring-loaded ​x3x tensioner unit. When pulled (emergency stop) or slackened (break/sag), the tensioner displaces, mechanically forcing its internal safety contacts to open. This signal is hardwired to the ​SHGV/B1.1/x1x control unit. Upon receiving the tensioner’s signal, the control unit’s ​force-guided relays instantly open the main E-stop circuit​ via their NC contacts, demanding an ​uncontrolled stop (Cat. 0)​​ by cutting power to hazardous movements. ​Critical restart security​ is achieved via the integrated reset knob on the control unit: After resolving the emergency, an operator must first ensure the rope is re-tensioned correctly, then ​manually twist and release the reset knob. This mechanical action ​physically re-latches the internal safety relays, closing the NC contacts only when the rope is taut and the reset is consciously executed. The ​positive mechanical linkage guarantees direct opening action, while the dual-channel design allows safety controllers to monitor for faults like contact welding.

Packaging & Shipping

Company Information
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