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350094M 184826-01
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Bently Nevada 126648-01 3500/25 Keyphasor I/O Module

  • Model: 126648-01
  • Brand: Bently Nevada
  • Series: 3500 Machinery Protection System
  • Core Function: Keyphasor signal processing
  • Product Type: Keyphasor I/O Module
  • Key Specs: Half-height module, 2 channels, external terminations
  • Condition: New Original / New Surplus (verify stock condition before purchase)
  • Application: Rotating machinery speed, phase, and timing measurement systems
  • ⚠️ Obsolete Model – Limited Stock Available (confirm current OEM support status before project planning)
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Description

3. Key Technical Specifications

  • Manufacturer: Bently Nevada
  • Model: 126648-01
  • System: 3500 Series Machinery Protection System
  • Module Type: Enhanced Keyphasor I/O Module
  • Module Height: Half-height rack module
  • Channels: 2 channels
  • Input Signals: Proximity probes or magnetic pickups
  • Function: Converts Keyphasor transducer signals into digital timing signals
  • Termination Type: External terminations
  • Power Supply: 24 VDC system supply
  • Typical Power Consumption: Approximately 3.2 W (verify against current OEM documentation)
  • Rack Compatibility: Bently Nevada 3500 rack architecture

 

4. Product Introduction

Bently Nevada 126648-01 is a 3500/25 Enhanced Keyphasor I/O Module designed for the Bently Nevada 3500 Machinery Protection System. It receives signals from proximity probes or magnetic pickups and provides Keyphasor timing signals used for rotating machinery speed, phase reference, and vibration analysis functions.

The module uses a half-height, two-channel design with external terminations for integration into 3500 rack systems. It is commonly used in turbine, compressor, and critical rotating equipment monitoring applications where accurate shaft timing reference is required.

146031-01
126648-01

 

5. Installation & Configuration Guide

Stage 1: Pre-Installation Preparation (Estimated time: 15 minutes)

⚠️ Safety First

  1. Notify operations before removing the monitoring module.
  2. Place the machine system in a safe maintenance condition.
  3. Apply lockout/tagout procedures where required.
  4. Confirm rack power status before removing the module.

Tools Required

  • ESD wrist strap
  • Digital multimeter
  • Screwdriver set
  • Wire labels
  • Smartphone/camera for rack and wiring photos

Data Backup

  1. Record existing module position in the 3500 rack.
  2. Photograph terminal wiring.
  3. Record rack configuration and monitor channel assignments.
  4. Document existing firmware/configuration information if available.

Stage 2: Removing the Old Module (Estimated time: 10 minutes)

  1. Open the 3500 rack access area.
  2. Identify the 126648-01 module location.
  3. Disconnect external termination wiring carefully.
  4. Release module locking mechanism.
  5. Pull the module straight out to avoid backplane damage.
  6. Inspect rack connectors for contamination or bent pins.

⚠️ Note: Keep the removed module until the replacement passes system validation.

Stage 3: Installing the New Module (Estimated time: 15 minutes)

  1. Verify the replacement part number:

    126648-01

  2. Check:
    • Module label
    • Connector condition
    • Physical damage
  3. Insert the module into the correct 3500 rack slot.
  4. Lock the module securely.
  5. Reconnect external termination wiring.

Self-Checklist

  • Correct module installed
  • Rack slot verified
  • Wiring matched to original configuration
  • Module fully seated
  • Locking tabs secured

Stage 4: Power-On & Testing (Estimated time: 20 minutes)

Pre-Power Check

  1. Verify wiring polarity and termination.
  2. Check for accidental shorts.
  3. Confirm connected probe/magnetic pickup compatibility.

Power-On Steps

  1. Restore rack power.
  2. Observe module LED status.
  3. Confirm module recognition in 3500 system software.
  4. Verify Keyphasor input signals.
  5. Confirm speed/phase readings.

⚠️ Troubleshooting Note

If the module does not operate:

  • Check rack slot compatibility.
  • Verify external termination wiring.
  • Confirm Keyphasor input signal level.
  • Check configuration in the 3500 system software.

 

6. Frequently Asked Questions (FAQ)

Q1: Can I hot-swap the Bently Nevada 126648-01?

It depends on the installed 3500 rack configuration and site procedures. For maintenance work, removing power before replacement is the safer practice unless the system documentation specifically allows live insertion.

Q2: What is the main function of the 126648-01?

It provides Keyphasor signal processing in a 3500 system. The module receives signals from proximity probes or magnetic pickups and converts them into digital Keyphasor timing signals used by monitor modules.

Q3: Is the 126648-01 obsolete?

Some suppliers list the 126648-01 as discontinued or beyond OEM production support, while surplus and replacement inventory remains available through industrial automation channels. Confirm availability before planning long-term upgrades.

Q4: Is this a genuine new Bently Nevada module?

The condition should be clearly stated:

  • New Original
  • New Surplus
  • Refurbished (tested)

For critical machinery protection systems, request inspection records, photos of labels, and warranty terms before purchase.

Q5: Can I replace it with another Keyphasor module?

Only after checking system compatibility. Verify:

  • 3500 rack configuration
  • Module type
  • Termination style
  • Channel requirements

A similar-looking module may not match the installed rack configuration.

Q6: Will replacing the module erase system settings?

The module replacement itself does not normally erase rack configuration stored in the 3500 system. However, always document settings before replacement and verify configuration after installation.

Q7: Why do prices vary between suppliers?

Industrial automation spare parts vary based on condition, testing process, warranty coverage, and stock source. A lower price should be evaluated together with authenticity checks and functional test records.

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