Description
Bently‑Nevada 3500/20 125744‑01 TMR Rack Interface Module(RIM)
Product Overview
125744‑01 is the TMR‑version Rack Interface Module (RIM) for Bently‑Nevada 3500 machinery protection system. It is the central communication gateway for the entire 3500 rack, must be installed in Slot 1 (adjacent to power supply). Besides all standard RIM functions, this TMR variant continuously compares measurement data from triple redundant monitor modules, performs channel discrepancy detection for safety‑critical TMR turbine/compressor racks. OEM original production discontinued; supplied as aftermarket spare part for power‑plant and petrochemical TSI retrofits and maintenanceBaker Hugh….
125744‑01
Key Specifications
| Item | Parameter |
|---|---|
| Part Number | 3500/20; PWA:125744‑01 (TMR RIM Main Board)本特利 |
| Manufacturer | Bently‑Nevada (Baker Hughes) |
| Form Factor | Full‑height module, occupies one full 3500 rack slot |
| Application | TMR triple‑modular‑redundant 3500 racks |
| Front‑panel Interface | RS‑232 configuration port, status LED indicators, rack reset key switch |
| Backplane Communication | High‑speed proprietary backplane bus for all rack internal modules |
| External Compatibility | Works with TDIX / TDXnet / DDIX external communication processors |
| Power Consumption | 4.75 W typical |
| Operating Temperature | ‑30 °C ~ +65 °C |
| Storage Temperature | ‑40 °C ~ +85 °C |
| Humidity | 5‑95 % RH non‑condensing |
| Relay Output | System OK relay, 5 A contact rating for rack‑fault remote alarming |
| Weight | Approx. 0.91 kg |
| Status | Obsolete original manufacturing, aftermarket spare‑part only |
Version comparison |PN|Type|Feature| |—|—|—| |125744‑01|TMR RIM|Triple‑monitor data comparison for safety‑critical TMR racks本特利| |125744‑02|Standard RIM|Non‑TMR, no triple‑channel comparison function|
Main Applications
- TMR triple‑redundant machinery‑protection racks for gas‑turbine, steam‑turbine, centrifugal compressors
- Power‑plant combined‑cycle unit safety‑critical TSI systems
- Petrochemical refinery high‑availability rotating‑equipment monitoring
- Rack configuration, event‑log retrieval, data gateway for System 1 diagnostic software
- Spare‑part replacement & hardware retrofit for legacy TMR‑configured 3500 installations
125744‑01
Related Series Models
- 125744‑01 TMR Rack Interface Module
- 125744‑02 Standard non‑TMR RIM main board
- 125768‑01 RIM I/O daughter‑board with RS‑232/RS‑422 interface
- 135031‑01 RIM I/O daughter‑board with internal modem
- 3500/15 System power supply for 3500 rack
- 3500/25 Keyphasor timing reference module
Core Features
- TMR triple‑monitor comparison function: Continuously compares measurement values from three redundant monitor channels; flags deviation and logs events once readings exceed configured tolerance threshold, supports safety‑critical protection‑rack voting logicBaker Hugh….
- Central rack communication gateway: Communicates with every monitor module via rack backplane; handles rack configuration download, real‑time data collection, alarm and event log storage.
- Front‑panel local configuration port: RS‑232 interface connects directly to laptop for 3500 rack setup without external communication processor.
- System‑OK fault relay: Form‑C dry‑contact relay outputs rack‑global health status to DCS or remote alarm annunciator.
- Rack‑level reset capability: Front‑panel key‑switch for manual rack alarm latch reset.
- Hot‑swap compatible: Full‑height hot‑swap module; does not participate in critical protection tripping path; monitor alarm & trip logic keeps running even if RIM fails本特利.
Main Functions
- Acts as master communication hub for the whole 3500 rack; exchanges commands, vibration data, alarm and diagnostic events with all monitor modules over backplane bus.
- Executes TMR channel‑comparison algorithm: validates consistency of three redundant monitor outputs, reports mismatch faults into system event list.
- Accepts local configuration via front‑panel RS‑232; cooperates with TDIX/TDXnet processors to export machinery data to System 1 or host automation system.
- Provides system‑OK relay dry‑contact output for remote rack‑health alarming to external DCS/PLC.
- Stores rack‑wide event & alarm history for post‑trip root‑cause analysis.
- Supports manual rack alarm reset through front‑panel key‑lock switch.
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