Product Overview

The Bently Nevada 3500/53-02-00 is a dedicated electronic overspeed detection system. This module accepts one transducer signal per channel. You can use it with proximity probes or magnetic pickups. The 3500/53-02-00 works inside a 3500 series rack. Multiple modules form a voting system for safety. Bently Nevada recommends a 2-out-of-3 voting configuration. This design increases system reliability and prevents false trips.

Technical Specifications

The 3500/53-02-00 has two independent channels. Each channel accepts an input signal from +10.0 V to -24.0 V. The module internally limits signals beyond this range. Input impedance is 20 kΩ for each channel. Power consumption is 8.0 watts typical. Operating temperature ranges from -30°C to +65°C. Storage temperature goes from -40°C to +85°C. Humidity tolerance is 95% non-condensing.

The 3500/53-02-00 provides a buffered transducer output on the front panel. Each coaxial connector has short circuit protection. Output impedance is 550 Ω. The transducer power supply delivers -24 Vdc at 40 mA maximum. A recorder output gives +4 to +20 mA signals. These values are proportional to full-scale RPM. Short circuits on the recorder output do not affect module operation. Voltage compliance range is 0 to +12 Vdc across a load. Load resistance must be 0 to 600 Ω.

Resolution for the recorder output is 0.3662 µA per bit. Error is ±0.25% at room temperature. Error over full temperature range is ±0.7%. Update rate is approximately 100 ms.

Relay Outputs

The 3500/53-02-00 includes single-pole double-throw (SPDT) relays. Each relay has epoxy sealing for environmental protection. Arc suppressors are installed as standard at 250 Vrms. Contact ratings are as follows:

• Max switched power (dc): 120 W

• Max switched power (ac): 600 VA

• Max switched current: 5 A (resistive load)

• Min switched current: 100 mA at 5 Vdc

• Max switched voltage (dc): 30 Vdc

• Max switched voltage (ac): 250 Vac

• Contact life: 100,000 operations at 5 A, 24 Vdc or 120 Vac

Each relay is switch selectable for normally de-energized or normally energized operation.

Front Panel Indicators

The 3500/53-02-00 has several LED indicators on the front panel:

• OK LED: Shows the module is operating properly

• TX/RX LED: Indicates communication with other 3500 rack modules

• Bypass LED: Lights when the module is in Bypass Mode

• Test Mode LED: Lights when the module is in Test Mode

• Alarm LEDs: Show alarm conditions for associated relays

Installation Guidelines

Power down the 3500 rack before installing the 3500/53-02-00. Insert the monitor module into a compatible rack slot. Connect the I/O module to the rear terminal block. Wire each transducer to the correct input channel. Use shielded cable for proximity probe signals. Set the voting configuration before system startup. Test each channel with a simulated overspeed signal. Verify all relay outputs operate correctly.

Packaging List

• One 3500/53-02-00 monitor module

• One I/O module with terminal block

• Two channel label strips

• One quick start guide

• Anti-static protective bag

Frequently Asked Questions (FAQ)

1. What voting configurations work with the 3500/53-02-00?
The 3500/53-02-00 supports 2-out-of-2 or 2-out-of-3 voting. Bently Nevada recommends 2-out-of-3 for highest safety.

2. What transducers connect to the 3500/53-02-00?
This module accepts proximity probes or magnetic pickups. Each channel takes one single transducer signal.

3. Can I use the 3500/53-02-00 in hazardous areas?
Yes, with approval option 01. It has CSA/NRTL/C certification for Class I, Div 2, Groups A, B, C, D.

4. What happens if the recorder output shorts?
The 3500/53-02-00 continues normal operation. Short circuits do not affect the module’s safety function.

5. How do I know if the module is communicating correctly?
Check the front panel TX/RX LED. A steady or blinking light indicates normal communication.