Description
Bently 3500/53‑02‑00 286566‑01
Technical Specifications Number of input channels: 2 independent input channels Compatible transducer: explosion‑proof certified keyphasor proximity probe, explosion‑proof magnetic pickup sensor Input signal amplitude range: 0.1 Vpp ~ 100 Vpp Speed measurement range: 0.1 RPM ~ 120000 RPM Maximum input pulse frequency: 25 kHz Trigger edge: configurable rising‑edge or falling‑edge trigger Measurement accuracy: ±0.5 RPM Power consumption: 8.8 W typical value, maximum 10.2 W Operating temperature: ‑40 ℃ ~ +70 ℃ Storage temperature: ‑40 ℃ ~ +85 ℃ Relative humidity: 5%‑95% RH, non‑condensing Shock resistance: 50 g peak value Vibration resistance: 10‑2000 Hz, 10 g peak value Backplane communication: 3500 proprietary system bus Module dimension: 241.3 mm × 24.4 mm × 241.8 mm Weight: 1.06 kg Compliance standard: API‑670, CE, ATEX intrinsic‑safety certification
Functional Features Two independent high‑performance tachometer input channels. Built‑in intrinsic‑safety‑barrier circuit limits loop voltage and current for hazardous‑area field sensors. High‑frequency pulse‑signal processing capability for high‑speed rotating‑machinery. Realize rotating‑speed measurement, zero‑speed detection, reverse‑rotation identification and keyphasor phase‑reference output. Programmable trigger edge and target‑tooth quantity. Dual‑level programmable Alert and Danger overspeed alarm setpoints, adjustable alarm hysteresis and delay time. Zero‑speed alarm and reverse‑rotation alarm function can be enabled or disabled. Front‑panel LED indicators show channel health status, alarm trigger status and module running condition. Buffered raw pulse‑signal output for external test instrument. Supports simplex, dual redundant and TMR triple‑modular‑redundant operation modes. All configuration parameters downloaded from 3500 configuration software. Upload real‑time speed and phase‑reference data to System‑1 machinery‑diagnostic software. Output alarm logic to 3500 series relay modules for machinery protection. Hot‑swap supported under normal rack power supply. Not applicable for emergency overspeed trip‑protection.
Application Scenarios High‑speed turbine and high‑speed compressor rotating‑speed monitoring for petrochemical hazardous‑area. Keyphasor phase‑reference signal supply for explosion‑proof‑zone high‑speed rotating‑machinery vibration spectrum analysis. Zero‑speed interlock protection for hazardous‑area large‑scale high‑speed rotating‑equipment. Reverse‑rotation detection for explosion‑proof high‑speed fan and pump unit. Speed‑monitoring for offshore‑platform high‑speed turbo‑generator unit. Speed‑related condition‑monitoring for oil‑refinery and coal‑chemical hazardous‑area high‑speed rotating‑machinery. Cooperate with 3500 rack vibration‑monitor module, communication module and relay module.
Performance Parameters Intrinsic‑safety‑barrier maximum output voltage: ‑28 Vdc Intrinsic‑safety‑barrier maximum short‑circuit current: 12 mA Alarm response delay: less than 350 ms Phase‑reference output precision: ±0.8 degree Channel‑to‑channel crosstalk: less than 0.1% full scale MTBF value: more than 310000 hours under normal industrial environment
Material Composition Front panel: blue coated metal panel with silk‑screen marking and LED indicator window. Main circuit board: multi‑layer FR‑4 high‑temperature resistant printed circuit board. Safety‑barrier components: intrinsic‑safety resistors, zener diodes and isolation components. Signal‑processing parts: high‑speed pulse‑conditioning circuit, high‑speed counter chip, FPGA digital‑processing unit. Module housing: aluminum alloy electromagnetic shielding shell. Locking device: stainless steel rack insertion latches. Connector: gold‑plated backplane connector and internal‑barrier signal connector.
Structural Features Standard single‑slot plug‑in module for 3500 instrument rack. Front‑panel LED indicator group and pull‑out latch mechanism. Rear gold‑plated multi‑pin connector connects rack backplane for power‑supply and system‑bus communication. Internal integrated intrinsic‑safety‑barrier circuit between input connector and high‑speed pulse‑conditioning circuit. Metal‑shielding shell separates hazardous‑side circuit, high‑frequency signal‑processing zone and digital‑logic zone.
Working Principle Field tachometer‑sensor pulse‑signal passes through built‑in intrinsic‑safety‑barrier circuit first to limit voltage and current for hazardous‑area loop. Protected pulse‑signal enters high‑speed signal‑conditioning circuit, analog pulse is shaped into high‑speed square‑wave digital pulse. High‑speed counter unit counts pulse quantity within fixed time window. Rotating‑speed value is calculated according to configured target‑tooth number. Phase‑reference signal is generated following trigger‑edge setting. Measured speed value compares with programmed Alert and Danger overspeed thresholds. Zero‑speed logic judges disappearance of pulse‑signal within set time window. Reverse‑rotation logic judges pulse sequence of dual‑channel input. Alarm flag will be generated when alarm condition is satisfied and transmitted to system bus and relay module. Real‑time speed and phase‑reference data is uploaded through rack backplane bus to rack‑interface module for upper‑level diagnostic‑software access. Buffered raw pulse‑signal is output for external test equipment.
