Bently Nevada 3500/50 133450-01 Tachometer Module

Precision Speed and Acceleration Monitoring for Critical Machinery

The Bently Nevada 3500/50 133450-01 Tachometer Module measures shaft speed, rotor acceleration, and rotor direction with high precision. This 2-channel module accepts input from proximity probes or magnetic pickups to monitor machinery performance. It then compares these measurements with user-programmable alarm setpoints, triggering alerts when the setpoints are exceeded.

You can program the 3500/50 Tachometer Module using the 3500 Rack Configuration Software. It offers four configuration options, which allow you to customize the monitoring to your needs:

Speed Monitoring, Setpoint Alarming, and Speed Band Alarming
Speed Monitoring, Setpoint Alarming, and Zero Speed Notification
Speed Monitoring, Setpoint Alarming, and Rotor Acceleration Alarming
Speed Monitoring, Setpoint Alarming, and Reverse Rotation Notification

Additionally, the 3500/50 Tachometer Module can send conditioned Keyphasor signals to the 3500 rack backplane. This feature removes the need for a separate Keyphasor module, simplifying your setup.

Key Technical Specifications

Feature	Specification
Product Type	3500/50 Tachometer Module
Module Channels	2 channels
Input Signal Type	Proximity probes or magnetic pickups
Input Signal Range	+10.0 V to -24.0 V
Input Impedance	20 kΩ (standard), 40 kΩ (TMR), 7.15 kΩ (Internal Barrier)
Power Consumption	5.8 watts (typical)
Transducer Power Supply	24 Vdc, 40 mA maximum per channel
Recorder Output	+4 to +20 mA, proportional to full-scale range (rpm or rpm/min)
Impedance	550 Ω
Monitor Operation	Unaffected by short circuits on recorder outputs

Features and Benefits

Multiple Configuration Options: Select from four setup options for speed, acceleration, and rotation direction monitoring.
Keyphasor Signals: The module provides conditioned Keyphasor signals directly to the 3500 rack, eliminating the need for additional modules.
User-Programmable Alarms: Set alarms based on customizable setpoints for early fault detection.
Compact and Efficient: The module offers low power consumption and various impedance options, making it a cost-effective solution.

Applications

Speed Monitoring: Monitor shaft rotational speed for turbines, compressors, and motors.
Rotor Acceleration Monitoring: Detect acceleration changes to identify mechanical issues early.
Reverse Rotation Notification: Alert operators when the rotor rotates in the wrong direction.
Zero Speed Notification: Notify when a machine stops completely, ensuring timely maintenance and safety.