Configured for once-per-turn reference signal generation and speed measurement in 3500 Machinery Condition Monitoring platforms, the Bently Nevada 3500/25-01-01-R0 (3500/25 Enhanced Keyphasor Module) provides direct physical/electrical execution.

Suffix Breakdown & Model Matrix

• 3500/25: Base model designation for the Enhanced Keyphasor module.
• 01: Channel option specifying a single half-height 2-channel Keyphasor card.
• 01-R0: I/O module type option with internal terminations and standard agency approval configurations.

Hardware Specifications

Rotor Dynamics & Signal Conditioning

• Eddy-Current Probe Scaling & Input Tracking: Accepts transducer signals from proximity probes or magnetic pickups with input ranges spanning +0.8 V to -21.0 V, ensuring accurate phase angle detection and speed tracking across transient rotor dynamics.
• Gap Voltage Validation: Supplies regulated -24 Vdc excitation to maintain proper operating gap voltages on connected proximity probes, preventing threshold jitter and phase errors during startup and shutdown conditions.
• Cross-Talk Suppression & Filtering: Utilizes robust internal signal conditioning with auto and manual threshold triggering, variable hysteresis (0.2 V to 2.5 V), and constant Q filtering to suppress electrical noise and prevent cross-talk between high-frequency pulse trains.

Ordering Info

• 1 x 3500/25 Enhanced Keyphasor Main Module (Part Number 149369-01)
• 1 x Keyphasor I/O Module with Internal Terminations (Part Number 125800-01)
• 1 x Keyphasor Module User Guide (Document 129770)
• 1 x 4-Position Green Internal Termination Connector Header

Field Installation Guidelines

• Rack Slot Allocation: Install the half-height main module into a special mounting adapter placed in either the top or bottom half-slot of any available rack position, ensuring the associated I/O module is secured in the matching full-height rear slot.
• Signal Wiring and Shielding: Terminate incoming signal lines directly to the internal termination connector headers while grounding shields properly to maintain noise immunity for high-speed pulse inputs.
• Firmware and Software Verification: Verify that the rack backplane and interface modules support the required firmware revisions prior to enabling multi-event per revolution tracking or advanced signal processing features.

Frequently Asked Questions

• How many transducer channels does the 3500/25-01 module accept?

  The module accepts up to two transducer signals from proximity probes or magnetic pickups.

• What is the typical power consumption of the 3500/25 module?

  The typical power consumption is 3.2 watts.

• What is the minimum signal amplitude required for auto-threshold triggering?

  The minimum signal amplitude for auto-threshold triggering is 2 volts peak-to-peak with a minimum frequency of 120 rpm (2 Hz).

• What power supply voltage does the module provide to the transducers?

  The module provides a regulated transducer power supply of -24 Vdc at up to 40 mA maximum per channel.

• What is the maximum input frequency range supported by the module?

  The input frequency range supports up to 20 kHz (1,200,000 cpm), including multi-event per revolution signals.

• How are buffered Keyphasor signals made accessible externally?

  Buffered Keyphasor signals are available via front-panel coaxial connectors and rear-panel Euro-style connectors.

• Can the module be installed in any slot within the 3500 rack?

  The half-height main modules can be placed in any of the 14 available slots using a card adapter, limited to two main modules per rack slot location.

• What is the input impedance of the Enhanced Keyphasor Module?

  The input impedance is 21.8 kΩ minimum.