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

3500/50M-01-00 Tachometer – RPM Accuracy & Installation Guide

Product Introduction

The 3500/50M-01-00 286566-02 Bently Nevada is a dedicated tachometer module. This module accepts up to two transducer signals. Specifically, it works with proximity probe transducers or magnetic pickups. The input signal range spans from +10.0 V to -24.0 V. Signals exceeding this range are internally limited. Input impedance is available in three options: 20 kΩ standard, 40 kΩ for TMR, or 7.15 kΩ for internal barrier applications.

Furthermore, the 3500/50M-01-00 supports 1 to 255 events per revolution for rotor acceleration and zero speed channel types. All other channel types support 0.0039 to 255 events per revolution. The maximum full-scale range reaches 99,999 rpm. Maximum input frequency is 20 kHz. Therefore, this module handles high-speed machinery reliably.

Core Value

This tachometer module delivers precise speed measurement. Firstly, RPM accuracy reaches ±0.1 rpm below 100 rpm. Between 100 and 10,000 rpm, accuracy stays within ±1 rpm. Above 10,000 rpm, accuracy holds at ±0.01% of true shaft speed. Secondly, the module provides programmable alarm delays. Alarm 1 delays range from 1 to 60 seconds in 1-second intervals. Alarm 2 delays range from 1 to 60 seconds in 0.1-second intervals. Additionally, the 286566-02 includes a recorder output for each channel. This +4 to +20 mA output remains unaffected by short circuits.

Technical Insights

The 3500/50M-01-00 286566-02 offers two transducer conditioning modes. Auto threshold mode works for any input above 0.0167 Hz. Minimum signal amplitude for triggering is 1 volt peak-to-peak. Manual threshold mode allows user selection from +9.5 Vdc to -23.5 Vdc. Minimum signal amplitude drops to 500 millivolts peak-to-peak. Hysteresis is user selectable from 0.2 to 2.5 volts.

Specifically, the transducer power supply delivers 24 Vdc at 40 mA maximum per channel. Buffered outputs are available at the I/O module via Euro-style connectors. Output impedance sits at 550 Ω. The recorder output has 0.3662 µA per bit resolution. Error stays within ±0.25% at room temperature. Update rate is approximately 100 ms. Load resistance ranges from 0 to 600 Ω. Voltage compliance spans 0 to +12 Vdc across the load.

Installation & Maintenance

Install the 3500/50M-01-00 in one full-height front slot. Firstly, verify your firmware versions. The 3500/22M module requires firmware revision 1.70 or later. The 3500/01 Configuration Software needs version 4.20 or later. The 286566-02 requires firmware revision 5.30 or later. Note that this module is not compatible with any version of 3500/20.

Secondly, disconnect rack power before insertion. Next, select your transducer type and threshold mode. After that, configure alarm setpoints using the software. Alarm levels range from 0 to 100% of full scale. For maintenance, check the OK LED regularly. A solid green light means normal operation. Also, verify the recorder output signals periodically. Keep ambient humidity below 95% non-condensing.

Packaging List

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

• 1 x I/O module with internal terminations

• 2 x Coaxial connector caps

• Configuration software compatibility sheet

Shipping: FedEx, UPS, DHL

FAQ

1. What transducers work with the 3500/50M-01-00?
The 3500/50M-01-00 286566-02 works with proximity probe transducers and magnetic pickups. Minimum input frequency for passive magnetic pickups is 3.3 Hz.

2. What is the maximum RPM this module can measure?
The maximum full-scale range is 99,999 rpm. Maximum input frequency is 20 kHz. Therefore, the 3500/50M-01-00 suits high-speed turbines and compressors.

3. Can I use this module with a 3500/20 rack?
No. The 286566-02 is not compatible with any version of 3500/20. You need a 3500/22M module with firmware revision 1.70 or later.

4. How do I set alarm delays?
Alarm 1 delays use 1-second intervals from 1 to 60 seconds. Alarm 2 delays use 0.1-second intervals from 1 to 60 seconds. Set these values using the 3500 Configuration Software.

5. What happens if the recorder output shorts?
Short circuits on the recorder output will not affect monitor operation. The 3500/50M-01-00 continues normal function. The +4 to +20 mA output is fully protected.