Product Brief: 3500/15-04-04-01 - Quadruple Module TMR (Triple Modular Redundant) Backplane Assembly
The 3500/15-04-04-01 is a specialized, high-density TMR (Triple Modular Redundant) Backplane Assembly for the Bently Nevada 3500 Machinery Protection System. It represents a high-channel-count, fault-tolerant hardware platform designed for extensive protection schemes. This assembly uniquely integrates two independent TMR channels (each requiring three monitoring modules) and their associated dual redundant power supplies within a single, consolidated chassis. It enables significant space savings and simplified wiring for complex machinery requiring multiple, highly reliable protection points.
Primary Application Scenarios:
Critical Multi-Point Machinery Protection: Protecting large steam turbines, gas turbines, or centrifugal compressors where multiple vibration, position, and speed measurements must all be monitored with TMR-level reliability (e.g., both turbine and generator ends).
High-Density Safety Systems: Applications where cabinet space is at a premium, such as offshore platforms, marine propulsion systems, or modernized control rooms with compact footprint requirements.
Unified Fault-Tolerant Monitoring: Consolidating the protection for two major, independent pieces of critical equipment (e.g., a turbine and its driven compressor) into a single, highly available hardware unit.
Large Power Generation Units: Providing a compact solution for comprehensive TSI (Turbine Supervisory Instrumentation) on large generator sets that require numerous, redundant monitoring points.
Applications Mandating SIL 2/3 for Multiple Loops: Implementing two separate, certified Safety Instrumented Functions (SIFs) within a single, integrated hardware package, reducing overall system complexity and cost of ownership.
Key Parameters & Specifications:
| Parameter Category | Specification Details |
|---|---|
| Core Function | Integrated backplane assembly supporting two independent TMR channels and dual redundant power supplies. Each TMR channel houses three monitoring modules, and the chassis supports two power supply modules for redundancy. |
| Part Number | 3500/15-04-04-01 (This part number indicates a chassis with two TMR slotsets [3+3 modules] and dual power supply slots). |
| Slot Configuration | Total Slots: 8 slots total. - TMR Channel 1: Slots for 3 identical monitoring modules. - TMR Channel 2: Slots for 3 identical monitoring modules. - Power Supplies: 2 slots for redundant power supply modules (3500/05 or 3500/05M). |
| Key Features | - Dual Independent TMR Channels: Each with its own hardware voting logic for alarm and 4-20mA outputs. - Dual Redundant Power Supplies: Shared, fault-tolerant power for the entire assembly with automatic switchover. - High-Density Design: Consolidates 6 monitoring modules and 2 power supplies in one unit. - Separate Communication Paths: Maintains independent communication for each TMR channel within the 3500 rack framework. |
| Physical Dimensions (Full Assembly) | Height: 318 mm (12.5 in) Width: Approximately 152 mm (6.0 in). This occupies 8 slots in a standard 3500 rack frame. Depth: 206 mm (8.1 in) |
| Weight (Approximate, Empty) | Assembly: ~3.6 kg (8.0 lbs) (Weight increases substantially when fully populated with six monitoring modules and two power supplies). |
| Compatible Monitoring Modules | Requires six total monitoring modules, configured as two sets of three identical TMR-Capable 3500 series modules (e.g., two sets of 3500/25 TMR). |
| Required Power Supply Modules | Requires two 3500/05 or 3500/05M Power Supply Modules. |
| Operating Environment | Temperature: 0°C to +65°C (+32°F to +149°F) Humidity: 5% to 95% RH, non-condensing. |
| Safety & Compliance | When populated with certified TMR modules and correctly configured, each independent TMR channel can be designed to meet Safety Integrity Level (SIL) 2/3 requirements as part of a broader Safety Instrumented System (SIS). |
Critical Configuration Note:
The 3500/15-04-04-01 is a complex, pre-wired assembly. Its correct operation and safety certification depend entirely on:
Populating it with the correct six monitoring modules (two groups of three identical modules).
Installing two qualified redundant power supplies.
Proper configuration using the 3500 Configuration Software, which must define the two independent TMR channels and their respective voting logic.
For definitive specifications, wiring diagrams, and SIL implementation guidance, always consult the official Bently Nevada (Baker Hughes) 3500 Hardware Manual and relevant Safety Manuals
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