Bently Nevada 134938-01 3500/50 Tachometer Module

Description

The 3500/50M Tachometer Module is a 2-channel device that receives input from proximity probes or magnetic pickups to monitor shaft rotational speed, rotor acceleration, and rotor direction. The module compares these measurements to user-configured alarm setpoints and generates alarms when they are violated.

Configuration Options

• Speed Monitoring, Setpoint Alarming, and Speed Band Alarming
• Speed Monitoring, Setpoint Alarming, and Zero Speed Notification
• Speed Monitoring, Setpoint Alarming, and Rotor Acceleration Alarming
• Speed Monitoring, Setpoint Alarming, and Reverse Rotation Notification

The 3500/50M can also provide conditioned Keyphasor* signals to the backplane of the 3500 rack, eliminating the need for a separate Keyphasor module.

The module features a peak hold function to store the highest speed, reverse speed, or the number of reverse rotations achieved. These peak values can be reset as required.

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Specifications

Inputs

• Signal: Up to 2 transducer signals from proximity probe transducers or magnetic pickups.
• Input Signal Range: +10.0 V to -24.0 V (signals exceeding this range are internally limited).
• Input Impedance:
  • 20 kΩ (standard)
  • 40 kΩ (TMR)
  • 7.15 kΩ (Internal Barrier)
• Power Consumption: 5.8 watts (typical).

Transducers

• Supports 1-2 proximity transducer signals.
• Restrictions: Some limitations apply for magnetic pickups (consult the manual for details).

Outputs

• Front Panel LEDs:

  • OK LED: Indicates proper module operation.
  • TX/RX LED: Indicates communication status with other modules in the 3500 rack.
  • Bypass LED: Indicates the module is in Bypass Mode.

• Buffered Transducer Outputs: Coaxial connectors for each channel, with short circuit and ESD protection.

• Recorder Outputs:

  • +4 to +20 mA (proportional to the full-scale range in RPM or RPM/min).
  • Individual recorder values are provided for each channel.

• Output Impedance: 550 Ω

• Transducer Power Supply: 24 Vdc, 40 mA max per channel.

Signal Conditioning

• Speed Input: Supports 1 to 255 events per revolution for Rotor Acceleration and Zero Speed channels. For other channel types, supports 0.0039 to 255 events per revolution.
• RPM Range: Up to 99,999 RPM; Maximum input frequency: 20 kHz.
• Minimum Input Frequency: 0.0167 Hz (1 RPM for 1 event/revolution) for proximity transducers; 3.3 Hz for magnetic pickups.

Accuracy

• RPM:
  • < 100 RPM: ±0.1 RPM
  • 100-10,000 RPM: ±1 RPM
  • 10,000-99,999 RPM: ±0.01% of true shaft speed
• RPM/Min Accuracy: ±20 RPM/min

Transducer Conditioning

• Auto Threshold: For input above 0.0167 Hz (1 RPM). Minimum signal amplitude: 1 V peak-to-peak.
• Manual Threshold: User-selectable from +9.5 Vdc to -23.5 Vdc. Minimum signal amplitude: 500 mV peak-to-peak.
• Hysteresis: User-selectable from 0.2 to 2.5 V.

Alarms

• Alarm Setpoints: Programmable for each measured value (up to two values per channel).
  • Alarm 1 Time Delay: 1 to 60 seconds.
  • Alarm 2 Time Delay: 1 to 60 seconds (in 0.1 second intervals).
• Proportional Values:
  • Rotor Speed
  • Peak Speed
  • Rotor Acceleration
  • Zero Speed
  • Reverse Rotation

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Physical Dimensions and Environmental Limits

Monitor Module Dimensions:

• Height: 241.3 mm (9.50 in)
• Width: 24.4 mm (0.96 in)
• Depth: 241.8 mm (9.52 in)
• Weight: 0.82 kg (1.8 lb)

Environmental Limits:

• Operating Temperature:
  • With Internal/External Termination I/O Module: -30°C to +65°C (-22°F to +150°F)
  • With Internal Barrier I/O Module: 0°C to +65°C (32°F to +150°F)
• Storage Temperature: -40°C to +85°C (-40°F to +185°F)
• Humidity: 95% (non-condensing)

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Contact Us

• Phone: +86-15915488782
• Email: uma@meloauto.com
• WhatsApp: +8615915488782
• Business Hours: 24/7 service
• Address: Unit 601, Powerlong International Center, No. 1599 Luling Road, Siming District, Xiamen City, Fujian, China

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