3500/25-01-01-00 Bently Nevada Enhanced Keyphasor Module

3500/25 Enhanced Keyphasor Module

Description The 3500/25 Enhanced Keyphasor Module is a half-height, two-channel module used to provide Keyphasor signals to the monitor modules in a 3500 rack. The module receives input signals from proximity probes or magnetic pickups and converts these signals into digital Keyphasor signals, indicating when the Keyphasor mark on the shaft coincides with the Keyphasor transducer. The 3500 Machinery Protection System can accept up to four Keyphasor signals for normal configurations and up to eight Keyphasor signals in a paired configuration.

A Keyphasor signal is a once-per-turn or multiple-event-per-turn pulse from a rotating shaft or gear that provides precise timing measurements. This allows 3500 monitor modules and external diagnostic equipment to measure shaft rotative speed and vector parameters such as 1X vibration amplitude and phase.

Specifications

Inputs

• Power Consumption: 3.2 Watts typical
• Signal: Each Keyphasor Module accepts up to two transducer signals from proximity probe transducers or magnetic pickups.
  • Input Signal Range: +0.8 V to -21.0 V (Non-Isolated I/O modules) or +5V to -11V (Isolated I/O modules). Signals exceeding this range are limited internally by the module.
  • Speed Requirement: Passive magnetic pickups require a shaft rotative speed greater than 200 rpm (3.3 Hz).
  • Input Impedance: 21.8 kΩ minimum

Signal Conditioning

• Speed/Frequency Signal Ranges: Input range of 1 to 1,200,000 cpm (0.017 to 20 kHz). Supports multiple events per revolution to a maximum of 20 kHz.
  • Output Range: 1 to 99,999 cpm (0.017 to 1667 Hz)
  • Speed/Frequency Signal Accuracy:
    • Nonprocessed Signals: 0.017 to 100 Hz ±1 cpm, 101 to 500 Hz ±8 cpm, 501 to 20 kHz ±1% of cpm
    • Processed Signals: 0.017 to 60 Hz ±1 cpm, 61 to 150 Hz ±8 cpm, 151 to 20 kHz ±1% of cpm
• Transducer Conditioning:
  • Auto Threshold: Minimum signal amplitude for triggering is 2 volts peak to peak and minimum frequency is 120 rpm (2 Hz).
  • Manual Threshold: Use for any input above 0.017 Hz (1 rpm for 1 event per revolution). User-selectable from 0 to -20 volts dc. Minimum signal amplitude for triggering is 500 millivolts peak to peak.
  • Hysteresis: User-selectable from 0.2 to 2.5 Volts.

Outputs

• Buffered Keyphasor Signals: Two buffered Keyphasor outputs are available at the front of the rack via coaxial connectors, and two at the back of the rack via Euro Style connectors.
  • Output Impedance: 504 Ω maximum buffered output impedance.
  • Keyphasor Transducer Power Supply: -24 Vdc, 40 mA maximum per channel.

Front Panel LEDs

• OK LED: Indicates when a fault has been detected in the Keyphasor Module.
• TX/RX LED: Indicates when the Keyphasor Module is communicating with the Rack Interface Module (RIM).

Environmental Limits

• Operating Temperature: -30°C to +65°C (-22°F to +150°F) when used with Keyphasor I/O Module other than the Internal Barrier version. 0°C to +65°C (32°F to +150°F) when used with Keyphasor Internal Barrier I/O Module (Internal Termination).
• Storage Temperature: -40°C to +85°C (-40°F to +185°F)
• Humidity: 95%, non-condensing

Physical Specifications

• Main Module Dimensions (Height x Width x Depth): 119.9 mm x 24.4 mm x 256.5 mm (4.72 in x 0.96 in x 10.10 in)
• Main Module Weight: 0.34 kg (0.76 lbs)
• I/O Module Dimensions (Height x Width x Depth): 241.3 mm x 24.4 mm x 103.1 mm (9.50 in x 0.96 in x 4.06 in)
• I/O Module Weight: 0.46 kg (1.01 lbs)

Rack Space Requirements

• Main Module: 1 half-height front slot. The half-height main modules require a special mounting adapter for mounting in the full-height slots. Each rack may have no more than two main modules, one in a top half-slot and one in a bottom half-slot.
• I/O Modules: 1 full-height rear slot

Ordering Information

• 3500/25: Enhanced Keyphasor Module
  • -01: Single half-height 2-channel Keyphasor card (order for 2-channels)
  • -01: I/O module with Internal Terminations
  • -00: Agency Approval Not required