Bently Nevada 3500/53-03-01 Electronic Overspeed Detection System

Description

The Bently Nevada™ Electronic Overspeed Detection System for the 3500 Series Machinery Protection System is a reliable, fast-response, redundant tachometer system. It is designed to meet the API Standards 670 and 612 for overspeed protection.

The system allows combining 3500/53 modules into either:

• 2-out-of-2 or
• 2-out-of-3 (recommended) voting systems.

The use of a 3500 rack with redundant power supplies is mandatory.

Specifications

Inputs

• Signal:
  Accepts a single transducer signal from a proximity probe or magnetic pickup.
  • Input range: +10.0 V to -24.0 V (signals exceeding this range are internally limited).
  • Input Impedance: 20 kΩ.
• Power Consumption: 8.0 watts, typical.
• Supported Transducers:
  • Bently Nevada 3300 8 mm Proximitor.
  • 3300 16 mm HTPS, 7200 Proximitor (5 mm, 8 mm, 11 mm, and 14 mm).
  • 3300 RAM Proximitor, or Magnetic pickups.

Outputs

• Front Panel LEDs:
  • OK LED: Module operating status.
  • TX/XR LED: Communication with other 3500 modules.
  • Bypass LED: Module is in bypass mode.
  • Test Mode LED: Indicates test mode activation.
  • Alarm LEDs: Indicates an alarm condition for associated relays.
• Buffered Transducer Outputs:
  • One coaxial connector per module.
  • Output Impedance: 550 Ω.
  • Transducer Power Supply: -24 Vdc, 40 mA max.
• Recorder Output:
  • Range: +4 to +20 mA, proportional to module full-scale range (rpm).
  • Voltage Compliance: 0 to +12 Vdc across load resistance (0 to 600 Ω).
  • Resolution: 0.3662 µA per bit, ±0.25% error at room temperature.
  • Update rate: 100 ms.

Relays

• Type: Single-pole, double-throw (SPDT).
• Sealing: Epoxy sealed with arc suppressors (250 Vrms installed).
• Ratings:
  • Max Switched Power: 120 W (DC), 600 VA (AC).
  • Max Current: 5 A.
  • Max Voltage: 30 Vdc, 250 Vac.
  • Min Switched Current: 100 mA @ 5 Vdc.
• Contact Life: 100,000 operations at 5 A, 24 Vdc or 120 Vac.
• Operation: Relays are switchable between Normally De-energized or Normally Energized.

Signal Conditioning

• Frequency Response:
  • Supports 1 to 255 events per revolution.
  • Max Full-scale Range: 99,999 rpm.
  • Max Input Frequency: 20 kHz.
  • Minimum Input Frequency:
    • Proximity transducers: 0.0167 Hz (1 rpm for 1 event/revolution).
    • Magnetic pickups: 3.3 Hz.
• RPM Accuracy:
  • Less than 100 rpm: ±0.1 rpm.
  • 100 to 10,000 rpm: ±1 rpm.
  • 10,000 to 99,999 rpm: ±0.01%.

Transducer Conditioning

• Auto Threshold:
  • Supports input signals above 0.0167 Hz.
  • Minimum signal amplitude: 1 V peak-to-peak.
• Manual Threshold:
  • Selectable from +9.9 Vdc to -23.9 Vdc.
  • Minimum signal amplitude: 500 mV peak-to-peak.
• Hysteresis: Selectable from 0.2 to 2.5 V.

Alarms

• Setpoints:
  • Adjustable for speed under and over alerts, and for Danger (overspeed).
  • Configurable through software.
  • Range: 0 to 100% of full-scale speed.
• Alarm Time Delay:
  • Less than 30 ms for inputs above 300 Hz.

Environmental Limits

• Operating Temperature: -30 °C to +65 °C (-22 °F to +149 °F).
• Storage Temperature: -40 °C to +85 °C (-40 °F to +185 °F).
• Humidity: Up to 95%, non-condensing.

Physical Specifications

• Monitor Module Dimensions:
  • 241.3 mm x 24.4 mm x 241.8 mm (9.50 in x 0.96 in x 9.52 in).
  • Weight: 0.82 kg (1.8 lb.).
• I/O Module Dimensions:
  • 241.3 mm x 24.4 mm x 99.1 mm (9.50 in x 0.96 in x 3.90 in).
  • Weight: 0.45 kg (1.0 lb.).

Rack Space Requirements

• Monitor Module: Requires 1 full-height front slot per channel.
• I/O Module: Requires 1 full-height rear slot per channel.

Ordering Considerations

General Requirements

• Firmware and Software Versions:
  • Minimum: 3500/03 Software Version 1.13.
• Redundant Power Supplies:
  • Mandatory for 3500 racks containing the Overspeed Detection System.

Model and Options

• Model Number: 3500/53-03-01.
• Channel Option:
  • 03: Three-channel system.
• Agency Approval Option:
  • 01: CSA/NRTL/C approved.

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