Description
Bently Nevada 3500/25 149369-01
Technical Specifications:
- Module Type: Half-height main module
- Power Consumption: 3.2 watts typical
- Input Signal Range: +0.8V to -21.0V (with non-isolated I/O); +5V to -11V (with isolated I/O)
- Input Impedance: Minimum 21.8 kΩ
- Auto Threshold: Minimum trigger signal amplitude 2V peak-to-peak; minimum frequency 120 rpm (2 Hz)
- Manual Threshold: User-selectable 0 to 20 VDC; minimum trigger signal amplitude 500 mV peak-to-peak
- Hysteresis: 0.2 to 2.5V, user-selectable
- Buffered Output Impedance: 504 Ω maximum
- Sensor Power Supply: -24 VDC, maximum 40 mA per channel
- Operating Temperature: -30°C to +65°C (with non-isolated I/O); 0°C to +65°C (with isolated I/O with internal terminals)
- Storage Temperature: -40°C to +85°C
- Humidity: 95% non-condensing
Functional Features:
- Enhanced signal processing compared to the legacy 125792-01 module
- Receives signals from proximity probes or magnetic pickups via the companion I/O module
- Converts analog input to digital keyphasor pulses
- Provides two buffered keyphasor outputs via front panel coaxial connectors
- Automatic and manual threshold detection modes
- Records shaft speed from each keyphasor sensor
- Returns module and channel status to the rack
- Field-upgradeable firmware
- Generates once-per-revolution event signals from multiple-per-revolution inputs
- Fully backward-compatible with legacy 3500 Keyphasor module
Application Scenarios:
- All 3500 system installations requiring keyphasor reference signals
- Turbine Supervisory Instrumentation (TSI) systems
- Vibration vector measurement (1X amplitude and phase)
- Phase-synchronous data acquisition
- TMR configurations for critical machinery protection
- Replacement for legacy 125792-01 Keyphasor modules in existing systems
Performance Parameters:
- Channel count: 2 channels per module
- Maximum keyphasor signals per system: 4 (standard), 8 (paired configuration)
- Minimum detectable frequency: 120 rpm (2 Hz) with auto threshold
- Minimum detectable frequency: 1 rpm (0.017 Hz) with manual threshold
- Passive magnetic pickup minimum shaft speed: 200 rpm (3.3 Hz)
Material Composition:
- High-reliability electronic components on multi-layer PCB
- Metal module enclosure with conformal coating
- Gold-plated backplane edge connectors
- Coaxial connectors for buffered output
Structural Features:
- Half-height module form factor
- Front panel with OK and TX/RX LED indicators, plus two coaxial buffered output connectors
- Plug-in design compatible with any accessible rack slot (top or bottom half-slot position)
Working Principle:
The 149369-01 main module receives conditioned analog signals from the companion I/O module, applies threshold detection and hysteresis filtering, and generates a clean digital keyphasor pulse each time the shaft keyphasor mark passes the sensor. This digital signal serves as a phase reference for all monitor modules in the rack, enabling vector measurements such as 1X amplitude and phase angle. The module also calculates and records shaft speed from the pulse frequency.
Installation Requirements:
- Install in any accessible half-slot position (top or bottom) in the 3500 rack
- Each rack supports a maximum of two keyphasor main modules
- A companion I/O module must be installed in the corresponding full-height rear slot
- For legacy system upgrades, the 149369-01 directly replaces the 125792-01 without rack modifications
Usage Notes:
- The 149369-01 is the main module only — it requires a companion I/O module for complete functionality
- Compatible I/O modules include: 125800-01 (non-isolated, internal terminals), 126648-01 (non-isolated, external terminals), 125800-02 (isolated, internal terminals), 126648-02 (isolated, external terminals)
- For TMR applications, two keyphasor modules operate in parallel to provide primary and auxiliary keyphasor signals
- Verify the OK LED indicator shows normal status after installation and power-up
