Product Brief: 3500/15 129486-01 - TMR (Triple Modular Redundant) Backplane
The 3500/15 129486-01 is a critical, high-integrity TMR (Triple Modular Redundant) Backplane within the Bently Nevada 3500 Machinery Protection System. It is not a monitoring module itself, but the foundational chassis that houses and interconnects other 3500 series modules. Its primary function is to provide fault-tolerant, triple-redundant power and communication pathways to three identical monitoring modules (such as a 3500/25, 3500/92, etc.), creating a single, highly reliable monitoring channel. This design is essential for applications requiring maximum availability and Safety Integrity Level (SIL) certification.
Primary Application Scenarios:
Safety-Critical Machinery Protection: Used in applications where the failure of a single monitoring channel could lead to hazardous situations or significant economic loss.
Turbine Supervisory Instrumentation (TSI): Protecting large steam and gas turbines by hosting TMR versions of vibration, speed, and position monitors.
Offshore Platforms & LNG Facilities: Where machinery reliability is paramount due to harsh environments and limited access for repair.
Critical Compressors in Petrochemical Plants: Ensuring continuous protection for equipment where an unplanned shutdown has severe consequences.
Applications Requiring SIL 2 / SIL 3 Certification: The TMR architecture, implemented using this backplane and configured software, is designed to help meet the requirements of functional safety standards like IEC 61508 and IEC 61511.
Key Parameters & Specifications:
| Parameter Category | Specification Details |
|---|---|
| Core Function | Triple Modular Redundant (TMR) Backplane. It accepts three identical monitoring modules and a 3500/05 or 3500/05M Power Supply. It performs hardware voting on the outputs of the three modules to generate a single, fault-tolerant output signal. |
| Part Number | 3500/15 129486-01 (Typically includes the backplane and necessary interconnecting hardware). |
| Key Features | - Triple Redundant Architecture: Provides fault tolerance against a single module's failure. - Module Synchronization: Synchronizes the operation of the three plugged-in monitoring modules. - Hardware Voting Logic: Votes on the alarm and 4-20 mA outputs from the three modules. - Integral Power Distribution: Distributes redundant power from the rack supply to the three modules. - Communications Interface: Connects the modules to the 3500 rack's system communication bus. |
| Physical Dimensions (for a 3-Slot TMR Assembly) | Height: 318 mm (12.5 in) - Standard rack height Width: Approx. 57 mm (2.25 in) - Occupies 3 module slots in a 3500 rack Depth: 206 mm (8.1 in) - Standard module depth |
| Weight (Approximate) | Backplane Assembly: ~1.8 kg (4.0 lbs) (excluding the three monitoring modules and power supply). |
| Compatible Modules | Requires three identical TMR-Capable monitoring modules (e.g., 3500/25 TMR Vibration Monitor, 3500/92 TMR Speed Monitor). |
| Required Power Supply | Must be used with a 3500/05 or 3500/05M Redundant Power Supply mounted in the same rack frame. |
| Operating Environment | Consistent with the 3500 rack system: Temperature: 0°C to +65°C (+32°F to +149°F) Humidity: 5% to 95% RH, non-condensing. |
Important Note: The 3500/15 TMR Backplane is always part of a larger system configuration. Its functionality and safety ratings are achieved only when populated with three qualified TMR modules, the correct power supply, and configured with appropriate voting logic using the 3500 Configuration Software.
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