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350054 133396-01
350054 133396-01
350054 133396-01

Bently Nevada 138708-01 3500/42M Shaft Absolute I/O Module

  • Model: 138708-01
  • Brand: Bently Nevada
  • Series: 3500 Machinery Protection System
  • Core Function: Shaft absolute signal interface
  • Product Type: 3500/42M Shaft Absolute I/O Module
  • Key Specs: 4-channel interface, internal terminations, 3500 rack compatible
  • Condition: New Original / New Surplus (verify stock condition before purchase)
  • Application: Rotating machinery shaft position and speed monitoring
  • Related Module: 3500/42M Proximitor®/Seismic Monitor I/O assembly
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Description

3. Key Technical Specifications

  • Manufacturer: Bently Nevada
  • Model: 138708-01
  • Module Type: Shaft Absolute I/O Module
  • System Compatibility: Bently Nevada 3500 Series Rack System
  • Associated Monitor: 3500/42M Proximitor®/Seismic Monitor
  • Channels: 4 channels
  • Termination Type: Internal terminations
  • Input Type: Shaft absolute encoder / compatible transducer inputs
  • Function: Shaft position and speed signal acquisition
  • Output Interface: Digital signal processing to 3500 monitoring system
  • Operating Temperature: Verify exact OEM datasheet limits for installed rack environment
  • Dimensions: Approx. 241.3 mm × 24.4 mm × 163.1 mm (varies by assembly reference)

 

4. Product Introduction

Bently Nevada 138708-01 is a 3500/42M Shaft Absolute I/O Module used in the 3500 Machinery Protection System. It provides the interface between shaft absolute measurement devices and the monitoring rack, allowing measurement of rotating shaft position and speed in critical machinery applications.

The module uses internal terminations and is designed for integration with 3500/42M monitoring hardware. Typical applications include turbines, compressors, generators, and other rotating assets where shaft reference information is required for protection and diagnostics.

350054 133396-01
138708-01

 

5. Installation & Configuration Guide

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

⚠️ Safety First

  1. Notify operations before removing the monitoring module.
  2. Confirm the machine is in a safe maintenance state.
  3. Apply lockout/tagout procedures where required.
  4. Remove rack power before module replacement unless the site procedure specifically allows otherwise.

Tools Required

  • ESD wrist strap
  • Digital multimeter
  • Screwdriver set
  • Wire labels
  • Smartphone/camera for rack documentation

Data Backup

  1. Record the existing rack slot location.
  2. Photograph the module label and wiring.
  3. Record 3500 configuration settings.
  4. Document connected sensors and channel assignments.

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

  1. Open the 3500 rack access area.
  2. Confirm the correct module position.
  3. Disconnect field wiring carefully.
  4. Release module locking hardware.
  5. Pull the module straight out.
  6. Inspect the backplane connector for dust, damage, or bent contacts.

⚠️ Note: Keep the removed module available until the replacement is fully tested.

Stage 3: Installing the New 138708-01 (Estimated time: 15 minutes)

  1. Verify the replacement part number:

    Bently Nevada 138708-01

  2. Inspect:
    • Module housing
    • Connector pins
    • Label information
  3. Insert the module into the correct 3500 rack slot.
  4. Secure the locking mechanism.
  5. Reconnect wiring according to the original documentation.

Self-Checklist

  • Correct module number verified
  • Correct rack slot confirmed
  • Wiring restored correctly
  • Module seated completely
  • Locking hardware secured

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

Pre-Power Check

  1. Verify wiring continuity.
  2. Check for shorts.
  3. Confirm connected encoder/transducer compatibility.

Power-On Steps

  1. Restore 3500 rack power.
  2. Check module LED status.
  3. Connect 3500 Rack Configuration Software.
  4. Verify module recognition.
  5. Confirm shaft absolute values and alarms.

⚠️ Troubleshooting Note

If the module does not communicate:

  • Confirm correct rack slot.
  • Verify 3500 configuration.
  • Check field wiring.
  • Confirm firmware compatibility with the installed rack configuration.

 

6. Frequently Asked Questions (FAQ)

Q1: Can I hot-swap the Bently Nevada 138708-01?

Follow the plant maintenance procedure. For most replacement work, removing rack power before removing the module is recommended to protect the backplane and avoid configuration issues.

Q2: What is the function of 138708-01?

The 138708-01 is the Shaft Absolute I/O Module associated with the 3500/42M system. It interfaces shaft absolute measurement signals with the machinery protection system for monitoring shaft position and speed.

Q3: Is 138708-01 obsolete?

The 3500 series remains widely installed in industrial plants. Availability of individual modules depends on supplier inventory, replacement programs, and surplus stock availability.

Q4: Is this a genuine new Bently Nevada module?

The supplier should clearly identify the condition:

  • New Original
  • New Surplus
  • Refurbished (tested)

For machinery protection hardware, request inspection records, label photos, and warranty terms before purchase.

Q5: Can I replace 138708-01 with another 3500 I/O module?

No. Different 3500 I/O modules have different signal types and termination configurations. Confirm the exact ordering code before replacement.

Q6: Will replacing this module erase my configuration?

The module replacement does not normally remove the complete 3500 rack configuration. However, document existing settings before replacement and verify channel configuration after installation.

Q7: What should I verify before ordering 138708-01?

Check:

  • Existing module part number
  • 3500 rack type
  • 3500/42M compatibility
  • Termination style
  • Connected sensor type

Matching the complete configuration avoids commissioning delays during maintenance outages.

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