Bently Nevada 3500/50-04-01 Tachometer Module

Dual-Channel Tachometer with Advanced Speed and Rotor Monitoring

The Bently Nevada 3500/50-04-01 Tachometer Module is a high-performance, 2-channel monitoring device designed to accurately measure shaft speed, rotor acceleration, and rotor direction. It accepts input from proximity probes or magnetic pickups, making it highly versatile for a range of industrial applications. The module continuously compares the measured data against user-defined alarm setpoints, generating alerts when thresholds are exceeded.

This module is fully programmable using the 3500 Rack Configuration Software and offers flexible configuration options to meet specific operational needs. With its ability to provide key performance indicators such as peak speed and reverse rotation counts, the 3500/50-04-01 enhances operational reliability by offering valuable insights into machinery performance.

Key Features and Configuration Options

2-Channel Monitoring: Monitor two separate channels simultaneously for more comprehensive machine health analysis.
Input Compatibility: Accepts signals from both proximity probe transducers and magnetic pickups.
User-Programmable Alarms: Configure alarm setpoints for various operational parameters, ensuring early detection of abnormal conditions.
Peak Hold Function: Stores the highest speed, highest reverse speed, and number of reverse rotations, and allows resetting of these peak values.
Keyphasor Signal Output: Supplies conditioned Keyphasor signals to the backplane of the 3500 Rack.

Configuration Options

The 3500/50-04-01 Tachometer Module can be customized to fit specific monitoring needs. The available configuration options include:

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

Key Technical Specifications

Feature	Specification
Product Type	3500/50-04-01 Tachometer Module
Channels	2 Channels
Input Signals	Proximity probes or magnetic pickups
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)
Buffered Outputs	Coaxial connectors, ESD and short circuit protected
Output Impedance	550 Ω
Transducer Power Supply	24 Vdc, 40 mA maximum per channel
Recorder Output	+4 to +20 mA, proportional to full-scale range
Voltage Compliance (current output)	0 to +12 Vdc range across load
Resolution	0.3662 µA per bit ±0.25% error at room temperature
Update Rate	Approximately 100 ms

Performance and Reliability

The 3500/50-04-01 Tachometer Module delivers reliable and real-time monitoring of rotational machinery, enhancing predictive maintenance efforts. The peak hold feature provides key operational data, including the highest speed and number of reverse rotations, which aids in proactive troubleshooting. With a typical power consumption of 5.8 Watts, it ensures efficiency without compromising performance.