Bently Nevada 3500/25-01-05-01 Enhanced Keyphasor Module

Configured for shaft timing signal acquisition in the Bently Nevada 3500 Machinery Protection System, the Bently Nevada 3500/25-01-05-01 (3500/25 Enhanced Keyphasor Module) provides direct electrical processing of Keyphasor transducer inputs for rotational speed, phase reference, and order tracking measurements.

Hardware Specifications

Eddy-Current Signal Processing and Rotor Dynamics Interface

The 3500/25 Enhanced Keyphasor Module processes timing pulses generated by proximity probe or magnetic pickup inputs. The module supports Keyphasor reference signals used for shaft rotational measurement, phase calculation, and vibration order analysis within the 3500 monitoring architecture.

For eddy-current probe applications, signal evaluation depends on correct probe scaling and gap voltage validation. The probe operating point is typically verified against the -10 VDC target gap reference used in Bently Nevada proximity measurement systems. Correct gap adjustment allows the module to receive stable rotational reference pulses for rotor dynamics analysis.

The module also supports multi-event-per-turn signal handling, allowing monitor modules and diagnostic software to calculate rotational phase information and analyze 1X vibration characteristics. Buffered outputs provide signal access for external diagnostic equipment while maintaining separation from the primary monitoring channels.

Frequently Asked Questions

Q: How many Keyphasor input signals can the 3500/25-01-05-01 process?
A: The module provides two independent Keyphasor input channels for connection to compatible proximity probes or magnetic pickups.

Q: Can the module support eddy-current proximity probe applications?
A: Yes. The isolated I/O configuration supports Keyphasor signals generated by proximity probe systems with appropriate -24 VDC transducer power supply requirements and gap voltage adjustment.

Q: What signal outputs are available from the module?
A: The module provides buffered Keyphasor outputs through two front panel coaxial connectors and two rear Euro-style connectors for external monitoring or testing equipment.

Field Installation Guidelines

Install the 3500/25 module in the designated slot position within a compatible Bently Nevada 3500 rack. Verify rack backplane connections before inserting the module and confirm that the power supply configuration matches the system requirements.

For Keyphasor field wiring, maintain proper cable shielding and separation from high-current power conductors to reduce electrical interference. Connect probe cable shields according to the site grounding practice and avoid creating unintended ground loops.

When installing eddy-current probe inputs, adjust probe position according to the applicable Bently Nevada proximity measurement procedure and verify the operating gap voltage before commissioning. Confirm signal polarity, channel assignment, and buffered output connections before enabling machinery monitoring functions.