Bently Nevada 3500/53-02-00 Overspeed Detection System

Bently Nevada 3500/53-02-00 Two-Channel Overspeed Detection Module

Product Introduction

The 3500/53-02-00 from Bently Nevada provides reliable overspeed protection for rotating machinery. This module accepts one transducer signal per channel. It works with proximity probe transducers or magnetic pickups.

For critical applications, three 3500/53 modules can form a 2-out-of-3 voting system. This setup is the recommended configuration. Alternatively, two modules create a 2-out-of-2 voting arrangement. The system trips only when the required number of channels detect an overspeed condition.

Additionally, this module operates over a wide temperature range. You can install it in harsh industrial environments. The front panel LEDs show OK, Bypass, Test Mode, and alarm status.

Key Technical Specifications

The 3500/53-02-00 offers precise speed monitoring. The input signal range goes from +10.0 V to -24.0 V. Internal limiting protects the module from over-voltage conditions.

Input impedance is 20 kΩ. Typical power consumption runs at 8.0 watts. The module provides a transducer power supply of -24 Vdc at 40 mA maximum.

For recording purposes, a +4 to +20 mA output is available. This value stays proportional to the module’s full-scale rpm range. Short circuits on the recorder output do not affect module operation.

Resolution reaches 0.3662 µA per bit. Error margins stay within ±0.25% at room temperature. Over the full temperature range, error remains within ±0.7%. Update rate is approximately 100 ms.

Relay Outputs and Contact Ratings

Each 3500/53-02-00 uses single-pole, double-throw (SPDT) relays. The relays are epoxy sealed for environmental protection. Arc suppressors rated at 250 Vrms come installed as standard.

You can select each relay for Normally De-energized or Normally Energized operation. Contact life reaches 100,000 operations at 5 A, 24 Vdc or 120 Vac.

Maximum switched power is 120 W for DC loads and 600 VA for AC loads. Maximum switched current is 5 A for resistive loads. Minimum switched current is 100 mA at 5 Vdc. Maximum switched voltage reaches 30 Vdc or 250 Vac.

Front Panel Indicators and Buffered Outputs

The front panel includes several LEDs. The OK LED shows when the 3500/53 module operates correctly. The TX/XR LED indicates communication with other modules in the 3500 rack.

Furthermore, the Bypass LED lights up when the module is in Bypass Mode. The Test Mode LED activates during testing. Alarm LEDs show alarm conditions for associated relays.

Each module has one coaxial connector for buffered transducer output. This connector is short circuit and ESD protected. Output impedance measures 550 Ω.

Environmental and Physical Specifications

Operating temperature ranges from -30 °C to +65 °C (-22 °F to +149 °F). Storage temperature extends from -40 °C to +85 °C (-40 °F to +185 °F). Humidity tolerance is 95% non-condensing.

For hazardous areas, approval option 01 provides CSA/NRTL/C certification. This covers Class I, Div 2, Groups A, B, C, D. Temperature rating is T4 at Ta = -20 °C to +65 °C. Certification number is CSA 150268-1002151 (LR 26744).

The monitor module measures 241.3 mm x 24.4 mm x 241.8 mm. Weight is 0.82 kg. I/O modules measure 241.3 mm x 24.4 mm x 99.1 mm and weigh 0.45 kg.

Installation Guidelines

First, ensure the rack is powered off before inserting the 3500/53-02-00 module. Next, align the module with the appropriate slot in the 3500 rack. Slide it in firmly until the connectors seat properly.

Then, secure the module with the front panel screws. Connect the transducer inputs to the designated terminals. For voting systems, install either two or three overspeed detection modules as required.

Finally, configure the relays for Normally Energized or Normally De-energized operation. Use the switch on each relay. Verify all connections before powering on the system.

Packaging List

• 1 x 3500/53-02-00 Monitor Module (Two-channel overspeed detection)

• 1 x I/O module for the 3500/53 system

• 1 x Coaxial connector for buffered output

• 2 x Relay configuration switches (pre-installed)

• 1 x Quick start guide

Shipping via Fedex, UPS, or DHL

Frequently Asked Questions (FAQ)

1. Can I use the 3500/53-02-00 with proximity probes and magnetic pickups?
Yes, the 3500/53-02-00 accepts both proximity probe transducers and magnetic pickups. The input signal range covers +10.0 V to -24.0 V.

2. What is the difference between 2-out-of-2 and 2-out-of-3 voting?
2-out-of-2 uses two modules. Both must trip to shut down the machine. 2-out-of-3 uses three modules. Two out of three must trip. Bently Nevada recommends the 2-out-of-3 configuration for better reliability.

3. How do I know if my 3500/53 module is communicating properly?
Look at the TX/XR LED on the front panel. When lit, it indicates the 3500/53 module is communicating with other modules in the 3500 rack.

4. What happens if the recorder output short circuits?
Module operation remains unaffected. The 3500/53-02-00 is designed to tolerate short circuits on the recorder output.

5. Is this module approved for use in hazardous locations?
With agency approval option 01, the 3500/53-02-00 carries CSA/NRTL/C certification for Class I, Div 2, Groups A, B, C, D. The standard version (option 00) has no hazardous area approvals.