PSC1-C-10-SDM1 Mechanical Interlock Single Contact Switch IP67 Stainless Steel Modular Industrial Guard

1. ​Product Overview​

The Schmersal PSC1-C-10-SDM1 is an intelligent cable-operated emergency stop system engineered for mission-critical industrial applications requiring comprehensive diagnostic capabilities. This system integrates a ​10-meter stainless steel tension cable (C-10)​​ with the ​SDM1 diagnostic monitoring unit, featuring real-time condition tracking and predictive maintenance alerts. Designed for SIL 3 safety circuits, the system detects operator-initiated emergency stops anywhere along the cable while continuously monitoring cable integrity. The SDM1 control unit houses dual-channel safety relays with force-guided contacts in a rugged polycarbonate enclosure rated ​IP66/IP69K, capable of withstanding high-pressure washdowns and chemical exposure. Integrated LED indicators display operational status, cable tension health, and fault conditions, while the stainless steel cable features UV-resistant PUR sheathing for outdoor installations. The system enables immediate Category 0 stops upon cable pull while providing diagnostic data to control systems via semiconductor outputs.

2. ​Key Technical Parameters​

Operating voltage spans ​24V DC to 230V AC (50/60Hz)​​ with dual ​10A/250V AC safety contacts​ meeting ​ISO 13849-1 PL e (Category 4)​​ and ​IEC 62061 SIL 3​ certifications. The 10-meter cable consists of a Ø4mm ​AISI 316 stainless steel core​ with ​polyurethane sheath​ resistant to oils, acids, and UV degradation. The SDM1 unit provides ​three diagnostic outputs:

• Cable tension status (NC)
• System fault (NO)
• Maintenance alert (NO)
  Activation requires ​70-150N pull force​ (field-adjustable) with ​​<100ms response time. Environmental specifications include ​​-30°C to +80°C operating temperature, ​30g shock resistance, and immunity to ​​≤100m/s² vibration. Continuous monitoring detects:
• Cable elongation >15%
• Micro-breaks in wire strands
• Contact welding
• Voltage fluctuations
  Connection utilizes ​M20 cable glands​ with screw terminals rated for 2.5mm² conductors. Mechanical endurance exceeds ​1 million operations.

3. ​Primary Applications and Use Cases​

This system is essential for safeguarding extended hazardous zones where operational reliability is paramount:

• ​Mining conveyors: Monitoring kilometer-long transfer systems with predictive cable wear alerts
• ​Automotive paint shops: Emergency stops in corrosive environments requiring IP69K protection
• ​Bulk material terminals: Protecting ship loading arms and railcar filling stations
• ​Steel continuous casters: Emergency stops along 50m+ casting platforms
• ​Airport baggage systems: Perimeter safety for curved conveyor networks
• ​Food processing lines: Washdown-area emergency stops with steam cleaning resistance
• ​Power generation: Turbine hall emergency stops with vibration immunity
• ​Paper mills: Web break emergency systems near chemical processing sections
  The SDM1 diagnostics are critical for applications where undetected cable degradation could compromise safety, particularly in inaccessible or high-vibration installations. The 10-meter modular design allows extension to 100m+ using splice kits.

4. ​Product Advantages and Functional Benefits​

• ​Predictive Maintenance: Early detection of cable fatigue (20% elongation threshold) prevents unexpected failures
• ​Reduced Downtime: Independent diagnostic channels maintain safety function during single faults
• ​Corrosion Resistance: Marine-grade stainless steel cable withstands salt spray and acidic environments
• ​Smart Monitoring: Three diagnostic outputs integrate with SCADA/BMS for condition-based maintenance
• ​False Trip Prevention: Temperature-compensated tensioning (±0.1N/°C) avoids thermal false alarms
• ​Compliance Assurance: Pre-validated safety templates for ISO 13850 and ANSI B11.19
• ​Extreme Environment Operation: -40°C cold-start capability for arctic installations
• ​Cybersecurity: Physical reset mandate prevents remote manipulation
• ​Lifecycle Cost Reduction: 50% longer service life versus standard cables through wear monitoring
• ​Simplified Auditing: Event logging stores last 10 faults with timestamps

5. ​Core Functionality and Diagnostic Operation​

The system employs multi-layer safety and monitoring:

1. ​Emergency Stop Activation: Cable pull displaces spring-loaded tensioners, mechanically opening force-guided NC contacts within 100ms
2. ​Continuous Diagnostics:
   • ​Cable Slack Monitoring: Laser-engraved fiducials on cable sheath enable optical elongation measurement (0.5mm resolution)
   • ​Micro-Break Detection: Continuity testing at 10kHz identifies broken strands before complete failure
   • ​Contact Surveillance: Redundant sensors verify contact separation distance (>0.5mm)
3. ​Fault Management:
   • Cable elongation >15% triggers maintenance alert
   • Contact welding forces system lockout
   • Voltage dips <18V DC activate fault output
4. ​Reset Protocol:
   • Requires physical key reset at SDM1 unit
   • Automatic tension verification before rearming
   • Diagnostic clearance confirmation via PLC
     The SDM1 unit's SIL 3-rated diagnostics provide 99.9% coverage of dangerous failures, while the PUR-sheathed cable maintains flexibility at -40°C. When integrated with safety PLCs, the system enables predictive replacement scheduling based on actual cable strain data, reducing maintenance costs by up to 40% compared to fixed-interval replacements.

Packaging & Shipping

Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.

With many years of experience in the industrial sector, we consistently deliver the highest quality of spare parts.which make sure that all this jobs are

perfectly.

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