The Bently Nevada 3500/25-01-02-00, also cataloged as the 3500/25 Enhanced Keyphasor Module, operates as a dedicated phase reference acquisition component for rotational speed and timing signal measurement within the Bently Nevada 3500 Machinery Protection System.

Configuration Identification

The 3500/25-01-02-00 configuration defines a single half-height 2-channel Keyphasor card with an I/O module using external terminations.

The module receives Keyphasor transducer signals and provides phase reference information used by 3500 monitoring modules for shaft speed measurement, vibration analysis synchronization, and rotor position tracking.

Hardware Specifications

Rotor Phase Reference Characteristics

The 3500/25 Enhanced Keyphasor Module provides phase reference signals required for machinery monitoring calculations. The Keyphasor input identifies a shaft reference position by detecting a once-per-revolution or multiple-event marker from a compatible transducer.

The module supports rotor dynamics analysis by providing synchronized timing information for vibration measurements. This phase reference allows 3500 monitoring modules to calculate phase angle, speed, and vector-related parameters.

For rotating machinery applications, correct Keyphasor alignment is required because inaccurate reference positioning can affect phase measurement and vibration analysis results.

Signal Interface and Timing Function

The 3500/25 module processes Keyphasor transducer input signals and distributes buffered output signals within the monitoring architecture.

The module design supports stable timing transmission through controlled input impedance and buffered output impedance. Proper sensor installation, signal shielding, and grounding practices are required to reduce electrical interference.

The Keyphasor function operates independently from eddy-current displacement scaling but provides synchronization data used with proximity monitoring channels for rotor dynamics evaluation.

Ordering Information

The delivered configuration includes:

• 1 x Bently Nevada 3500/25-01-02-00 Enhanced Keyphasor Module
• 1 x Single half-height 2-channel Keyphasor card
• 1 x External termination I/O module

Required system components:

• 1 x Compatible Bently Nevada 3500 rack
• 1 x Compatible 3500 power supply module
• 1 x Compatible Keyphasor transducer assembly

Field Installation Guidelines

Module Installation

• Install the module into a compatible 3500 rack slot.
• Verify rack backplane compatibility before installation.
• Confirm I/O module termination type matches the field wiring configuration.

Keyphasor Signal Wiring

• Use appropriate shielded signal cables for Keyphasor connections.
• Keep sensor wiring separated from high-current power circuits.
• Maintain correct grounding practices to reduce electrical noise.

System Configuration

• Verify Keyphasor channel settings before commissioning.
• Confirm shaft reference position alignment.
• Validate speed and phase measurements after startup.

Frequently Asked Questions

• What is the primary function of the 3500/25 module?

  The module provides Keyphasor phase reference acquisition for shaft speed, timing synchronization, and rotor dynamics calculations.

• How many Keyphasor channels are available?

  This configuration provides a single half-height card with 2 Keyphasor channels.

• Does the module measure vibration amplitude directly?

  No. It provides phase reference signals used by other 3500 monitoring modules for vibration analysis.

• What type of termination does this model use?

  The 3500/25-01-02-00 configuration uses an I/O module with external terminations.

• Can this module connect directly to a PLC input?

  No. It is designed for use within the Bently Nevada 3500 Machinery Protection System architecture.

• Does the module require a separate transducer?

  Yes. The module requires a compatible Keyphasor transducer to receive shaft reference signals.

• What environmental humidity rating is specified?

  The module is specified for operation or storage conditions up to 95% humidity, non-condensing.

• Does the module support rotor phase analysis?

  Yes. The Keyphasor reference signal provides timing information required for phase-based rotor analysis.