Bently 3500-70M 176449-08 Recip Impulse Velocity Monitor Main Board

Description

Hardware & Electrical Specifications

‑ Manufacturer: Bently Nevada (Baker Hughes) ‑ Compatible System: 3500‑05 full‑size / mini TSI rack, cooperates with 3500/22M TDI module ‑ Functional Type: 4‑Channel Reciprocating Compressor Impulse Velocity / Acceleration Monitor Module ‑ Channel quantity: 4 independent seismic sensor input channels ‑ Supported transducers: IEPE accelerometer sensors ‑ Transducer power supply: Constant‑current excitation for IEPE accelerometers ‑ Input impedance: 10 kΩ (acceleration mode); >1 MΩ (velocity mode) ‑ Sensitivity range:  ‑ Impulse Acceleration:0.51‑11.72 mV/(m/s²)  ‑ Recip Velocity:3.54‑22.64 mV/(mm/s) ‑ Frequency response: Depends on selected measurement mode, covers low‑frequency reciprocating impact to high‑frequency valve‑impact vibration ‑ Measurement accuracy: ±0.5 % of reading typical ‑ Typical power consumption:7.7 W, powered by rack backplane bus ‑ Front‑panel Indicators: OK LED, TX/RX LED, Bypass LED; four BNC buffered raw‑signal outputs for on‑site debugging ‑ Matching Parts: Main‑board 176449‑08 must pair with corresponding dedicated rear I/O board (internal‑termination / external‑termination options, sold separately) ‑ Hot‑swap: Supports hot‑swap; during replacement, four‑channel reciprocating‑machine vibration measurement is temporarily invalid; other rack modules keep running normally. ‑ PCB Coating: Conformal coated for G3 harsh industrial cabinet environment ‑ Safety Certification: SIL‑2 capable within complete certified 3500 TMR system set; ATEX, CE hazardous‑area approvals available

Environmental Specifications

‑ Operating Temperature:0 ℃ ~ +65 ℃ ‑ Storage Temperature:‑40 ℃ ~ +85 ℃ ‑ Relative Humidity:5%‑95 % non‑condensing ‑ Vibration & Shock: Complies with API‑670 power‑plant cabinet EMC standards

Mechanical Data

‑ Dimension(W×H×D):241.3 mm ×24.4 mm ×241.8 mm ‑ Weight: approx 0.85 kg

Core Functions

1. Seismic sensor signal conditioning: Supply IEPE constant‑current excitation, process accelerometer signals for reciprocating‑compressor impact‑vibration acquisition.
2. Multi‑mode measurement: Impulse Acceleration, Acceleration‑2, Recip Velocity, Low‑Frequency Recip Velocity modes, adapt to different fault types: valve failure, piston slap, cross‑head and connecting‑rod abnormal impact.
3. Flexible alarm configuration: Alert and Danger setpoints with configurable delay; generate rack‑system events, trigger relay‑module alarm output.
4. TMR redundant support: Can form triple‑modular‑redundant system with three identical modules installed in adjacent slots for high‑safety reciprocating‑compressor protection application.
5. Self‑diagnosis: Detect accelerometer open‑circuit / short‑circuit and transducer power‑supply fault; report module hardware fault to rack‑system log.

Installation, Replacement & Critical Warnings

1. Supports hot‑swap; four‑channel reciprocating‑compressor vibration measurement loses effectiveness during pulling‑out; other rack modules keep running.
2. Compatibility warning: ‑ Two rear‑I/O options: internal‑termination (field wiring directly to rear‑card) or external‑termination (match external terminal‑block assembly). Select I/O type according to site‑wiring scheme. ‑ Cannot swap main‑board or rear‑I/O between 3500/70M and other 3500 series monitor modules. ‑ For TMR triple‑redundant configuration, three identical 176449‑08 modules must be installed in adjacent slots of rack.
3. After replacement, check OK / Bypass LED status; download rack‑configuration project, complete accelerometer‑signal simulation test, verify channel reading and alarm‑trigger function.

4. Common failure mode: Front‑end seismic‑signal conditioning‑circuit damage, BNC‑connector wear, component aging; accelerometer‑cable short‑circuit / open‑circuit may affect channel measurement.