Product Overview

The Bently Nevada 3500/50M-01-00 286566-02 provides reliable speed measurement for critical machinery. This Tachometer Module accepts up to two transducer signals. You can use proximity probes or magnetic pickups as inputs. The module includes I/O module type 01 with internal terminations. It has no hazardous area approval (option 00). This device is essential for turbines, compressors, and generators.

Technical Specifications

Input Characteristics

• Signal Inputs: Accepts up to two transducer signals. Use proximity probes or magnetic pickups.

• Input Signal Range: Operates from +10.0 V to -24.0 V. Signals outside this range are limited internally.

• Input Impedance: Standard mode uses 20 kΩ. TMR mode uses 40 kΩ. Internal barrier uses 7.15 kΩ.

• Power Consumption: Consumes 5.8 Watts typical.

Speed and Frequency Ranges

• Maximum Full Scale: Supports up to 99,999 rpm.

• Maximum Input Frequency: Handles up to 20 kHz.

• Events per Revolution: Supports 1 to 255 events for Rotor Acceleration channels.

• Minimum Frequency (Proximity): Works down to 0.0167 Hz (1 rpm with 1 event/rev).

• Minimum Frequency (Magnetic): Requires at least 3.3 Hz for passive magnetic pickups.

RPM Accuracy

• Less than 100 rpm: Accuracy is ±0.1 rpm.

• 100 to 10,000 rpm: Accuracy is ±1 rpm.

• 10,000 to 99,999 rpm: Accuracy is ±0.01% of true shaft speed.

• RPM/Min Accuracy: Maintains ±20 rpm/min.

Transducer Conditioning

• Auto Threshold: Works for any input above 0.0167 Hz. Minimum signal amplitude is 1 volt peak-to-peak.

• Manual Threshold: User selectable from +9.5 Vdc to -23.5 Vdc. Minimum amplitude is 500 mV peak-to-peak.

• Hysteresis: User selectable from 0.2 to 2.5 volts.

Output and Interface Details

• Front Panel LEDs: OK LED indicates normal operation. TX/RX LED shows rack communication. Bypass LED indicates bypass mode.

• Buffered Outputs: Each channel has a coaxial connector. Connectors are short circuit and ESD protected.

• Output Impedance: Fixed at 550 Ω.

• Transducer Power Supply: Provides 24 Vdc at 40 mA maximum per channel.

• Recorder Output: Provides +4 to +20 mA proportional to full-scale rpm. Load resistance is 0 to 600 Ω.

• Resolution: 0.3662 µA per bit with ±0.25% error at room temperature.

Alarm Specifications

• Alarm Setpoints: Alarm 1 sets for each measured value. Alarm 2 sets for any two values.

• Alarm Range: Adjustable from 0 to 100% of full scale.

• Alarm 1 Time Delay: Programmable from 1 to 60 seconds in 1-second intervals.

• Alarm 2 Time Delay: Programmable from 1 to 60 seconds in 0.1-second intervals.

Physical Dimensions

• Height: 241.3 mm (9.50 inches)

• Width: 24.4 mm (0.96 inch)

• Depth: 241.8 mm (9.52 inches)

• Weight: 0.82 kg (1.8 lb)

• Rack Space: Requires 1 full-height front slot.

Installation Guide

Follow these steps to install the Bently Nevada 3500/50M-01-00 286566-02.

1. Verify your 3500 rack has an empty full-height slot.

2. Power down the 3500 monitoring system completely.

3. Slide the module into the selected front slot carefully.

4. Tighten the front panel screws to secure the module.

5. Connect transducers to the internal terminations on the I/O module.

6. Power on the system and check the OK LED status.

Firmware and Software Requirements

The 3500/50M-01-00 requires specific versions for proper operation.

• 3500/22M Module Firmware: Revision 1.70 or later

• 3500/01 Configuration Software: Version 4.20 or later

• 3500/02 Data Acquisition Software: Version 2.52 or later

• 3500/03 Display Software: Version 1.52 or later

• 3500/50M Firmware: Revision 5.30 or later

Note: This module is not compatible with any version of the older 3500/20 rack.

Package List

• 1 x Bently Nevada 3500/50M-01-00 286566-02 Tachometer Module

• 1 x I/O module with internal terminations (Type 01)

• 1 x Front panel connector kit

• 1 x Installation and configuration manual

Common FAQs

Q1: What transducers work with the 3500/50M-01-00?
A: This Tachometer Module accepts proximity probes and magnetic pickups. Each channel connects to one transducer for speed measurement.

Q2: What is the maximum speed this Bently Nevada 3500/50M-01-00 can measure?
A: The module measures up to 99,999 rpm maximum. It handles input frequencies up to 20 kHz for high-speed machines.

Q3: Does the 3500/50M-01-00 286566-02 have hazardous area approval?
A: No, this version has approval option 00 which means no hazardous area certification. Use it only in safe locations.

Q4: How do I set the alarm thresholds on this tachometer module?
A: You set all alarms using the 3500 configuration software. Alarm 1 and Alarm 2 have independent time delays.

Q5: Can I use this module with an older 3500/20 rack?
A: No, the Bently Nevada 3500/50M-01-00 is not compatible with any 3500/20 version. Use only with 3500/22M racks.