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Bently Nevada 3500/50 Tachometer Module

The Bently Nevada 3500/50 Tachometer Module is a speed measurement and monitoring module used within the 3500 Series Machinery Protection System.

The module accepts input signals from:

• Proximity probe transducers

• Magnetic pickup sensors

It processes these signals to determine:

• Shaft rotational speed

• Rotor acceleration

• Rotation direction

• Zero speed condition

The 3500/50 compares measured speed values with programmed alarm setpoints and generates alarm conditions when configured limits are exceeded. Configuration is performed through 3500 Rack Configuration Software, allowing users to select different monitoring functions based on equipment requirements.

Typical configuration options include:

• Speed monitoring with setpoint alarming and speed band alarming

• Speed monitoring with zero speed notification

• Speed monitoring with rotor acceleration alarming

• Speed monitoring with reverse rotation notification

Bently Nevada 3500/50

Manufacturer:
Bently Nevada

Series:
3500 Machinery Protection System

Product Type:
Tachometer Module

Module Function:
Rotational speed and rotor condition monitoring

Channel Configuration:
Dual-channel

Compatible Sensors:
Proximity probes and magnetic pickups

Installation:
Bently Nevada 3500 rack system

Dual-Channel Speed Monitoring

The 3500/50 provides two independent tachometer channels for monitoring machine speed signals from multiple sensing points.

Rotor Acceleration Detection

The module can monitor changes in rotational speed and identify abnormal acceleration conditions.

Reverse Rotation Monitoring

The system can detect reverse shaft rotation events, helping operators identify unexpected machine operating conditions.

Keyphasor Signal Conditioning

The 3500/50 can supply conditioned Keyphasor signals to the 3500 rack backplane, allowing other monitoring modules to use timing reference signals.

Programmable Alarm Functions

Speed alarms and monitoring parameters can be configured according to machine operating requirements. 

• Provides accurate real-time shaft speed measurement

• Supports critical rotating equipment monitoring

• Reduces the need for additional Keyphasor hardware in some systems

• Improves machinery condition visibility

• Supports predictive maintenance strategies

• Integrates with existing Bently Nevada 3500 platforms

Power Generation

Used for monitoring turbine shaft speed, generator speed, and rotating equipment operation.

Oil & Gas Industry

Applied in compressors, pumps, expanders, and high-speed rotating machinery.

Petrochemical Plants

Supports equipment monitoring systems requiring reliable speed feedback.

Industrial Manufacturing

Used for production machinery requiring rotational speed supervision.

Energy Equipment

Provides speed monitoring for critical mechanical systems.

Q1: What is the Bently Nevada 3500/50 used for?

A:
The 3500/50 is used to monitor shaft speed, rotor acceleration, and rotation direction within the Bently Nevada 3500 Machinery Protection System.

Q2: How many channels does the 3500/50 have?

A:
The module provides two independent tachometer input channels.

Q3: Does the 3500/50 provide overspeed protection?

A:
No. The 3500/50 provides speed monitoring functions but is not designed as a dedicated overspeed protection system. Dedicated overspeed applications use systems such as the Bently Nevada 3500/53.

Q4: Which sensors can be connected to the module?

A:
The module supports proximity probe transducers and compatible magnetic pickup inputs.

Q5: Can the 3500/50 replace a Keyphasor module?

A:
In some configurations, the module can provide conditioned Keyphasor signals through the rack backplane, reducing the need for a separate Keyphasor module.

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