Technical Specifications of Bently Nevada 3500/25 149369-01

Input and Power Data

The 3500/25 149369-01 consumes 3.2 Watts typically. It accepts up to two transducer signals per module. The input signal range is +0.8 V to -21.0 V. For isolated I/O, the range is +5V to -11V. Input impedance is 21.8 kΩ minimum. Passive magnetic pickups need >200 rpm to work.

Speed and Frequency Ranges

This Bently Nevada Keyphasor Module covers a wide speed range. Input range goes from 1 to 1,200,000 cpm. Output range is 1 to 99,999 cpm. It supports multiple events per revolution. The maximum frequency is 20 kHz.

Measurement Accuracy

Accuracy is specified at +25°C (+77°F). For non-processed signals from 0.017 to 100 Hz, error is ±1 cpm. From 101 to 500 Hz, error is ±8 cpm. From 501 to 20 kHz, error is ±1% of cpm. Processed signals show similar high precision.

Transducer Conditioning Features

The module offers auto threshold triggering. Minimum signal amplitude is 2 volts peak to peak. Minimum frequency is 120 rpm for auto mode. Manual threshold is user-selectable from 0 to -20 Vdc. Minimum amplitude here is 500 millivolts peak to peak. Hysteresis is adjustable from 0.2 to 2.5 Volts.

Output and Power Supply Details

The 3500/25 149369-01 provides two buffered Keyphasor outputs. These are on the front via coaxial connectors. Two more outputs are at the rack rear. Output impedance is 504 Ω maximum. The transducer power supply is -24 Vdc. Each channel supports 40 mA maximum.

Environmental Limits

Operating temperature ranges from -30°C to +65°C. With internal barrier I/O, the range is 0°C to +65°C. Storage temperature is -40°C to +85°C. Humidity tolerance is 95% non-condensing. This makes the module suitable for harsh industrial sites.

Physical Dimensions

Main module height is 119.9 mm (4.72 in). Width is 24.4 mm (0.96 in). Depth is 256.5 mm (10.10 in). The compact design fits standard Bently Nevada racks.

Front Panel Indicators

The OK LED shows a detected fault inside the module. The TX/RX LED indicates communication with the Rack Interface Module (RIM). These LEDs help with quick diagnostics.

Installation Guidelines for 3500/25 149369-01

Always power off the rack before inserting the module. Insert the Bently Nevada 3500/25 firmly into the designated slot. Secure it with the front screws. Connect transducer signals to the correct I/O module. Use coaxial cables for buffered outputs. Verify the threshold settings before startup. Check the LED status after power-on.

Package Contents

• One 3500/25 149369-01 Enhanced Keyphasor Module main unit

• Front panel screws (set of 2)

• Quick start reference card

(Note: I/O module and transducers are sold separately.)

Frequently Asked Questions (FAQ)

1. Which transducers work with the Bently Nevada 3500/25 149369-01?
This module accepts proximity probe transducers and passive magnetic pickups. The signal range must be +0.8 V to -21.0 V.

2. What is the minimum speed for a magnetic pickup?
You need a shaft rotative speed greater than 200 rpm. This equals 3.3 Hz minimum for reliable triggering.

3. How many Keyphasor channels does this module provide?
The 3500/25 149369-01 accepts two transducer signals per module. It also delivers four buffered outputs in total.

4. Can I use this module in very cold environments?
Yes, the operating temperature goes down to -30°C. This works when using the non-isolated I/O module version.

5. What does a flashing OK LED mean on the 3500/25?
A flashing or steady OK LED indicates a fault. Check the module configuration and power supply. Also verify the I/O module connection.