286566-02 | BENTLY NEVADA 3500/50M Tachometer Module

Description:

The 3500/50M Tachometer Module is a 2-channel module designed to monitor shaft speed, rotor acceleration, and rotor direction using proximity probes or magnetic pickups. It compares these measurements to user-programmable alarm setpoints and triggers alarms when the setpoints are violated. The module is programmable via 3500 Rack Configuration Software and supports multiple 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

This module can also generate Keyphasor signals for use by other monitors in the system, eliminating the need for a separate Keyphasor module.

It includes a peak hold feature, which stores the highest speed, reverse speed, or number of reverse rotations reached by the machine. Peak values can be reset as needed.

Specifications:

Inputs:

• Signal: Accepts 1-2 signals from proximity probe transducers or magnetic pickups
• Signal Range: +10.0 V to -24.0 V (Excess signals limited internally)
• Input Impedance: 20 kΩ (Standard), 40 kΩ (TMR), 7.15 kΩ (Internal Barrier)
• Transducers: Accepts up to 2 proximity signals; limitations apply to magnetic pickups

Power Consumption:

• 5.8 watts (typical)

Outputs:

• Front Panel LEDs:
  • OK LED: Indicates proper operation
  • TX/RX LED: Indicates communication with other modules
  • Bypass LED: Indicates Bypass Mode
• Buffered Transducer Outputs: Coaxial connectors, short-circuit and ESD protected
• Output Impedance: 550 Ω
• Transducer Power Supply: 24 Vdc, 40 mA max per channel
• Recorder Outputs: +4 to +20 mA, proportional to full-scale range (rpm or rpm/min)
• Voltage Compliance (current output): 0 to +12 Vdc range, load resistance 0 to 600 Ω
• Resolution: 0.3662 µA per bit, ±0.25% error at room temperature

Signal Conditioning:

• Speed Input: Supports 1 to 255 events per revolution for rotor acceleration and zero-speed channels. All other channels support 0.0039 to 255 events per revolution.
• Maximum Full-Scale Range: 99,999 rpm, input frequency up to 20 kHz
• RPM Accuracy:
  • Less than 100 rpm = ±0.1 rpm
  • 100 to 10,000 rpm = ±1 rpm
  • 10,000 to 99,999 rpm = ±0.01% of true shaft speed
• RPM/Min Accuracy: ±20 rpm/min

Physical Specifications:

• 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)

Environmental Limits:

• Operating Temperature:
  • With Internal/External Termination I/O Module: -30 ºC to +65 ºC (-22 ºF to +150 ºF)
  • With Internal Barrier I/O Module: 0 ºC to +65 ºC (32 ºF to +150 ºF)
• Storage Temperature: -40 ºC to +85 ºC (-40 ºF to +185 ºF)

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