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350022M 138607-01
350022M 138607-01
350022M 138607-01

Bently Nevada 3500/25 Keyphasor Module

  • Model: Bently Nevada 3500/25 (125792-01)
  • Brand: Bently Nevada
  • Series: 3500 Machinery Protection System
  • Core Function: Keyphasor signal processing
  • Product Type: Monitoring / Timing Module
  • Key Specs: Dual-channel Keyphasor input, 3500 rack compatible, 24 VDC system power
  • Condition: New Original / New Surplus
  • Application: Rotating machinery vibration monitoring systems
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Description

3. Key Technical Specifications

  • Model Number: 3500/25 (125792-01)
  • Manufacturer: Bently Nevada (Baker Hughes)
  • Product Type: Enhanced Keyphasor Module
  • System Platform: 3500 Machinery Protection System
  • Channels: 2 Keyphasor channels
  • Input Signal: Proximity probe Keyphasor pulse signal
  • Power Supply: 3500 rack backplane powered
  • Communication: 3500 rack internal communication bus
  • Operating Temperature: -30 to +65 °C typical system environment
  • Mounting: 3500 series rack slot installation
  • Configuration Software: 3500 System Configuration Software
  • Standards: Designed for industrial machinery monitoring applications

 

4. Product Introduction

The Bently Nevada 3500/25 (125792-01) is an Enhanced Keyphasor Module used in the 3500 Machinery Protection System for processing rotational reference signals from Keyphasor probes. It provides phase reference and speed measurement input for turbine, compressor, motor, and other critical rotating equipment monitoring applications.

The module integrates directly into a Bently Nevada 3500 rack and works with vibration monitoring modules that require accurate shaft position reference. In field replacements, engineers commonly verify rack configuration, firmware compatibility, and Keyphasor wiring before installation.

350022M 138607-01
3500/25

 

5. Installation & Configuration Guide

Stage 1: Pre-Installation Preparation (Approx. 10 minutes)

⚠️ Safety First:

  1. Notify operations before removing the module.
  2. Verify the machine is in a safe maintenance condition.
  3. Apply lockout/tagout procedures.
  4. Remove rack power and wait at least 5 minutes for capacitor discharge.

Tools Required:

  • ESD wrist strap
  • PH1 screwdriver
  • Digital multimeter
  • Wire labels
  • Smartphone for configuration photos

Data Backup:

  1. Open 3500 System Configuration Software.
  2. Export the existing rack configuration.
  3. Record rack slot position.
  4. Photograph module settings and wiring before removal.

Stage 2: Removing the Old Module (Approx. 5 minutes)

  1. Remove the front cover or bezel if installed.
  2. Label all Keyphasor wiring before disconnecting.
  3. Release rack locking tabs.
  4. Pull the module straight out to protect the backplane connector.
  5. Inspect the rack slot for dust, damaged pins, or corrosion.

⚠️ Note: Keep the removed module until the replacement is fully tested and communicating correctly.

Stage 3: Installing the New Module (Approx. 10 minutes)

  1. Wear an ESD wrist strap before handling the replacement module.
  2. Verify the replacement model matches Bently Nevada 3500/25 (125792-01).
  3. Confirm rack slot location matches the original configuration.
  4. Insert the module firmly until the locking mechanism engages.
  5. Reconnect Keyphasor wiring using the original terminal layout.

Self-Checklist:

[ ] Correct module model verified
[ ] Rack slot confirmed
[ ] Wiring labels checked
[ ] Module fully seated

Stage 4: Power-On & Testing (Approx. 15 minutes)

Pre-Power Check:

  • Verify no short circuit exists on rack power supply.
  • Confirm wiring polarity and terminal connections.

Power-On Steps:

  1. Power the 3500 rack only.
  2. Check module LEDs.
  3. Connect 3500 System Configuration Software.
  4. Verify module recognition.
  5. Confirm firmware and configuration data.
  6. Perform Keyphasor signal verification.
  7. Confirm connected monitoring modules receive valid phase reference.

⚠️ Troubleshooting Note:

  • Red fault indication: Check module configuration and rack compatibility.
  • No Keyphasor signal: Verify probe wiring, gap voltage, and input settings.
  • Communication issue: Confirm rack slot address and configuration file.

 

6. Frequently Asked Questions (FAQ)

Q1: Can the Bently Nevada 3500/25 be hot-swapped under power?

No. The 3500/25 should be replaced following approved maintenance procedures with rack power removed. Pulling modules under power can create backplane faults and damage sensitive electronics.

Q2: Is the Bently 3500/25 obsolete?

The 3500/25 is an older generation monitoring module, but it remains widely used in installed Bently Nevada 3500 systems. Availability depends on stock condition. Verify your rack firmware and existing configuration before ordering.

Q3: Is this a genuine new module or refurbished unit?

Condition should always be confirmed before purchase. New Original / New Surplus units should retain original OEM labels and pass functional verification. Refurbished units should include testing records.

Q4: Will I lose my configuration when replacing the 3500/25?

Normally, the rack configuration remains in the host system, but always save a backup before replacement. Record slot location, module settings, and Keyphasor parameters before removing the old unit.

Q5: What should I check before ordering a replacement?

Verify:

  • Exact part number: 3500/25
  • Module number: 125792-01
  • Rack series: Bently Nevada 3500
  • Existing firmware compatibility
  • Keyphasor wiring type and application

Q6: Why is the price lower than OEM factory pricing?

Industrial automation spare parts are often sourced from surplus inventory, shutdown projects, or maintenance stock. Pricing varies depending on condition, testing history, availability, and warranty coverage. Always verify inspection records before installation.

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