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Bently Nevada 3500 Vibration System Testing on the Pratt & Whitney FT8

A Practical, Field-Proven Verification Procedure Using a Simple Frequency Generator

This 26-minute technical training video provides a clear, practical, and repeatable method for verifying the complete Bently Nevada 3500 vibration protection system installed on the Pratt & Whitney FT8 gas turbine. The focus is not theory, but how to actually test the system in the field—from the field wiring and termination boards, through the 3500 cards, to the alarms, shutdowns, and relay outputs.

Unlike many vibration courses that assume expensive test equipment or factory support, this training demonstrates how the entire verification can be performed using a low-cost FG-100 frequency generator (typically available online for under USD $50), combined with a calibrated multimeter. The result is a procedure that is accessible, repeatable, and suitable for commissioning, troubleshooting, and periodic verification.

By the end of this training, you will be able to confidently verify not only the FT8 Bently Nevada 3500 system, but any Bently Nevada vibration system using the same fundamental approach.

What This Course Covers

This training walks step-by-step through a complete vibration system verification, including both displacement and velocity-based channels used on the FT8. You are shown exactly where to inject signals, how to set up the frequency generator, how to verify the signal electrically, and how to confirm the system response inside the 3500.

Key topics include:

• Understanding the FT8 Bently Nevada 3500 system architecture

• Identifying field termination boards, D-25 connectors, and multi-signal cables

• Mapping vibration channels from the field wiring to the correct 3500 card and slot

• Correct signal injection points for generator and turbine vibration channels

• Verification of alarms, shutdowns, and 86E relay operation

 Practical Signal Injection Using the FG-100

A major strength of this course is the practical use of a simple frequency generator. Rather than relying on specialized Bently Nevada tools, the course demonstrates how the FG-100 can be used to simulate vibration signals accurately and safely.

You will learn how to:

• Configure the FG-100 for vibration signal simulation

• Apply the correct DC offset required by Bently Nevada proximity and velocity systems

• Set frequency and amplitude precisely using the generator and a multimeter

• Verify frequency, DC voltage, and AC amplitude independently

• Avoid common mistakes that lead to false alarms or failed tests

The course explains why each setting matters, not just which buttons to press.

Generator Displacement Probe Testing

The training begins with displacement probe simulation for the generator channels. You will see how to:

• Inject a simulated non-contact probe signal

• Apply the correct −9.5 VDC offset

• Convert mils of vibration into millivolts

• Understand RMS versus peak and peak-to-peak measurements

• Verify alarm and shutdown setpoints correctly

This section removes much of the confusion around vibration units and measurement methods that commonly cause errors during testing.

Turbine Velocity Transducer Testing (Flanges A, K, & S)

The course then moves into velocity-based vibration channels using Bently Nevada 330750 high-temperature velocity transducers. These channels are often misunderstood because the alarms are displayed in displacement units even though the transducer output is velocity.

You will learn:

• How integrated accelerometer/velocity transducers work

• How frequency affects vibration amplitude calculations

• How to convert displacement (mils) into velocity (in/sec or mm/sec)

• How to calculate the correct millivolt levels for alarms and shutdowns

• Why frequency selection is critical when simulating vibration

Clear worked examples are shown so you can reproduce the calculations in the field.

Special FT8 Vibration Channels

The course also covers the less obvious vibration-related channels on the FT8, including:

• Collector Box Alignment

• Water Injection vibration monitoring

These channels use filtered signals and shared transducers, and the training explains:

• How the signals are derived

• Which frequencies must be injected

• How to calculate alarm amplitudes

• Why time delays (such as the 30-minute alarm delay) must be considered

• Differences between pre- and post-Service Bulletin 13M04 settings

This is information that is rarely documented clearly and often learned only through experience.

Interface Cable Design

To simplify testing and reduce risk, the course includes detailed guidance on building a custom D25 to BNC interface cable. This cable allows clean signal injection without disturbing permanent wiring.

You will see:

• Exact pin-to-pin wiring for all four channels

• Correct signal and common polarity

• Practical wiring tips to avoid loose connections

• How to add test leads for multimeter verification

This alone can save hours during commissioning or troubleshooting.

Who This Course Is For

This training is ideal for:

• Commissioning engineers

• Maintenance technicians

• Instrumentation and control engineers

• Field service engineers

• Operators responsible for vibration system integrity

If you are responsible for verifying that an FT8 vibration system will protect the turbine when it matters most, this course gives you a proven, field-tested method to do exactly that.

What You Will Walk Away With

After completing this course, you will be able to:

• Confidently test and verify a Bently Nevada 3500 system

• Perform vibration verification without expensive test equipment

• Understand the why behind vibration alarm settings

• Diagnose wiring, card, or logic issues systematically

• Apply the same methodology to other Bently Nevada installations