3500/50M-01-01-01 Bently Nevada Tachometer Module

Description

The 3500/50M Tachometer Module is a 2-channel module that accepts input from proximity probes or magnetic pickups to determine shaft rotative speed, rotor acceleration, or rotor direction. The module compares these measurements against user-programmable alarm setpoints and generates alarms when the setpoints are violated. The Tachometer Module is programmed using the 3500 Rack Configuration software. The following configuration options are available:

• 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

Specifications

Inputs

Signal

• Each 3500/50M Tachometer Module accepts up to two transducer signals from proximity probe transducers or magnetic pickups.

Input Signal Range

• +10.0 V to -24.0 V (Signals exceeding this range are limited internally by the module.)

Input Impedance

• 20 kΩ (standard)
• 40 kΩ (TMR)
• 7.15 kΩ (Internal Barrier)

Power Consumption

• 5.8 watts, typical

Transducers

• Accepts 1 to 2 proximity transducer signals (Restrictions may apply to magnetic pickups.)

Outputs

Front Panel LEDs

• OK LED: Indicates when the 3500/50M Tachometer Module is operating properly.
• TX/RX LED: Indicates when the Tachometer Module is communicating with other modules in the 3500 rack.
• Bypass LED: Indicates when the Tachometer Module is in Bypass Mode.

Buffered Transducer Outputs

• The front of each module has one coaxial connector for each channel. Each connector is short circuit and ESD protected.
• Buffered outputs are available at the I/O module via Euro style connectors.

Output Impedance

• 550 Ω

Transducer Power Supply

• 24 Vdc, 40 mA maximum per channel

Recorder Output

• +4 to +20 mA (Values are proportional to module full-scale range (rpm or rpm/min). Individual recorder values are provided for each channel. Monitor operation is unaffected by short circuits on recorder outputs.)

Voltage Compliance (current output)

• 0 to +12 Vdc range across load (Load resistance is 0 to 600 Ω)

Resolution

• 0.3662 µA per bit ±0.25% error at room temperature ±0.7% error over temperature range

Update Rate

• Approximately 100 ms

Physical Dimensions

Monitor Module (Main Board) Dimensions (Height x Width x Depth)

• 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)

Rack Space Requirements

Monitor Module

• 1 full-height front slot