Overview

The 3500/25 Enhanced Keyphasor Module is a half-height, two-channel module designed to provide Keyphasor signals to monitor modules in a 3500 Machinery Protection System. It receives input signals from proximity probes or magnetic pickups and converts them into digital Keyphasor signals. These signals indicate when the Keyphasor mark on the shaft coincides with the Keyphasor transducer.

• The system supports up to four Keyphasor signals in normal configuration, or up to eight Keyphasor signals in a paired configuration.

Specifications

Inputs

• Power Consumption:

  • 3.2 Watts typical

• Signal Input:

  • Accepts up to two transducer signals per Keyphasor Module from proximity probe transducers or magnetic pickups.
  • Input Signal Range:
    • Non-Isolated I/O modules: +0.8V to -21.0V
    • Isolated I/O modules: +5V to -11V
  • Signals exceeding this range are limited internally by the module.
  • Passive magnetic pickups require a shaft rotational speed greater than 200 RPM (3.3 Hz).

• Input Impedance:

  • 21.8 kΩ minimum

Outputs

• Output Impedance:
  • 504 Ω maximum buffered output impedance.

Keyphasor Transducer Power Supply

• -24 Vdc, 40 mA maximum per channel.

Environmental Specifications

• 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

Mechanical Specifications

• Dimensions:

  • Height: 241.3 mm (9.50 in)
  • Width: 24.4 mm (0.96 in)
  • Depth: 103.1 mm (4.06 in)

• Weight:

  • 0.46 kg (1.01 lbs.)

• Rack Space Requirement:

  • 1 full-height rear slot