TRICONEX T4351B

Description

1. Product Overview

2. Product Parameters

2.1 Core Output Specifications

• Output Channels: 32 Form C (SPDT) relay channels (8 channels per group, isolated between groups)
• Relay Ratings:
  • Resistive Load: 250V AC/5A, 30V DC/5A
  • Inductive Load: 250V AC/2A, 30V DC/2A (with surge suppression)
• Contact Life: Mechanical ≥10 million operations, Electrical ≥100,000 operations (at rated load)
• Response Time: ≤10ms (coil energization to contact closure)
• Isolation: 2500V AC between channels (group-to-group), 3000V AC between module and backplane

2.2 Electrical & Communication Parameters

• Power Supply: 24V DC (redundant input, supplied by Tricon chassis), power consumption ≤15W
• Backplane Interface: TRICONEX Tricon proprietary TMR bus (10Mbps, redundant)
• Diagnostic Features: Coil open/short detection, contact weld detection, module self-test (BIT), fault status feedback
• Safety State: Configurable fail-safe output (energize-to-operate or de-energize-to-operate)
• LED Indicators: Per-channel status (ON/OFF), module power, fault, and TMR synchronization

2.3 Environmental & Mechanical Parameters

• Operating Temperature: -40°C to +70°C (industrial-grade wide temperature range)
• Storage Temperature: -55°C to +85°C
• Relative Humidity: 5% to 95% (non-condensing, IP20 protection)
• Vibration Resistance: 5-2000Hz, 5g (IEC 60068-2-6, X/Y/Z axes)
• Shock Resistance: 30g (11ms half-sine wave, IEC 60068-2-27)
• Mounting: TRICONEX Tricon 3000/4000/5000 chassis dedicated slot, hot-swappable (TMR-compatible)

2.4 Certifications & Compatibility

• Safety Certifications: SIL 3 (IEC 61508/61511), TÜV Rheinland, ATEX Zone 2 (Ex ib IIC T4)
• Industry Certifications: CE, UL/cUL Class 1 Div 2, FCC Class A, RoHS
• Compatibility: TRICONEX Tricon controllers (MP3008, MP2101), TriStation 1131 engineering software, all TRICONEX I/O modules
• MTBF: ≥1,000,000 hours (per Telcordia SR-332 standards)

3. Advantages & Features

1. High-Density & Fault-Tolerant Design: TRICONEX T4351B offers 32 relay outputs in a single module, reducing chassis space requirements and wiring complexity. Its group-based isolation and TMR compatibility eliminate single points of failure, ensuring reliable operation even in the event of channel or power supply faults.
2. Comprehensive Diagnostics: With coil open/short detection and contact weld monitoring, TRICONEX T4351B provides real-time fault feedback to the Tricon controller. Operators can identify issues (e.g., failed relays, shorted coils) before they cause process disruptions, enabling predictive maintenance and reducing unplanned downtime.
3. Flexible Fail-Safe Configuration: TRICONEX T4351B supports both energize-to-operate and de-energize-to-operate modes, allowing customization for safety-critical applications (e.g., ESD valves requiring fail-closed operation). This flexibility ensures compliance with industry-specific safety standards.
4. Hot-Swappable & Easy to Maintain: TRICONEX T4351B is hot-swappable in Tricon chassis, meaning modules can be replaced without shutting down the SIS or interrupting critical processes. Its front-panel LED indicators simplify troubleshooting, reducing maintenance time and costs.
5. Harsh Environment Reliability: Rated for -40°C to +70°C operation and 5g vibration resistance, TRICONEX T4351B performs reliably in extreme environments—from offshore platforms to desert refineries—without requiring additional cooling or protection.

4. Application Fields & Cases

4.1 Application Fields

• Oil & Gas: ESD valve control, pipeline isolation, compressor shutdown systems, offshore platform fire/gas mitigation
• Petrochemical: Refinery burner management (fuel valve control), reactor emergency shutdown, storage tank overfill protection
• Power Generation: Turbine lube oil pump control, boiler safety valve actuation, nuclear auxiliary system switching
• Chemical: Hazardous material transfer valve control, batch reactor dump valve actuation, fire suppression system triggering

4.2 Typical Cases

1. Refinery ESD System: A major European refinery deployed TRICONEX T4351B modules in its TMR ESD system to control 128 valves across 4 process units. The modules’ contact weld detection feature identified a faulty relay in a critical shutdown valve, allowing proactive replacement and avoiding a potential explosion. Over 3 years of operation, the system achieved 99.99% uptime.
2. LNG Plant Compressor Control: An Asian LNG plant integrated TRICONEX T4351B into its compressor safety system to manage motor starters and isolation valves. The modules’ -40°C operating temperature rating ensured reliable performance in arctic conditions, while hot-swappable design enabled maintenance during peak production periods without downtime.
3. Nuclear Power Auxiliary System: A North American nuclear power plant used TRICONEX T4351B to control coolant pump motors and isolation valves in auxiliary systems. The modules’ SIL 3 certification and fail-safe configuration met strict nuclear regulatory requirements, providing redundant, fault-tolerant switching for safety-critical loads.

5. Competitive Comparison

6. Selection Suggestions & Precautions

6.1 Selection Suggestions

1. Safety & Density Requirements: Choose TRICONEX T4351B for SIL 3 applications requiring high-density (32-channel) Form C relay outputs—e.g., refinery ESD, LNG plant control. For lower-density or SIL 2 applications, consider TRICONEX T4350 (16-channel) or competitor modules.
2. Environmental Conditions: Select TRICONEX T4351B for extreme temperature/vibration environments (e.g., offshore, arctic); standard modules suffice for controlled indoor settings.
3. Maintenance Needs: Opt for TRICONEX T4351B if hot-swapping or advanced diagnostics (contact weld detection) are critical for minimizing downtime in 24/7 operations.

6.2 Precautions

1. Installation Guidelines:
   • Install TRICONEX T4351B in a TRICONEX Tricon chassis only; ensure proper alignment with the backplane connector to avoid damage.
   • Use twisted-pair wiring for relay outputs, with surge suppression for inductive loads (e.g., motors, valves) to extend contact life.
2. Configuration Notes:
   • Configure fail-safe modes (energize/de-energize) via TriStation 1131 software to match application safety requirements (e.g., fail-closed for ESD valves).
   • Enable diagnostic features (contact weld detection) during setup to ensure early fault identification.
3. Troubleshooting:
   • For failed outputs: Check coil power, relay contact status (via LEDs), and load wiring; use TriStation to verify TMR synchronization.
   • For communication faults: Ensure the module is seated correctly and validate backplane bus connectivity with the Tricon controller.
   • Hot-swapping: Follow TRICONEX procedures (mark module as “offline” in TriStation) to avoid disrupting redundant systems.
4. Maintenance:
   • Inspect relay contacts for wear every 2 years (or after 100,000 operations) and replace modules with degraded contacts.
   • Clean connector pins and backplane contacts annually to prevent corrosion-related faults.
   • Stock spare TRICONEX T4351B modules for critical applications to minimize downtime in case of failure.

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