Overview

The Pulse Input (PI) Module offers six highly sensitive, high-frequency inputs, which can be individually configured to accommodate both non-amplified and amplified magnetic speed sensors commonly found in rotating equipment, such as turbines or compressors. The PI Module detects voltage transitions from the speed sensors, sampling each input transition to measure the time for an optimized number of input gear pulses. The resulting count and time are utilized to generate a frequency (in revolutions per minute), which is then transmitted to the Main Processors.

Specifications

• Points: 6, channel-isolated, commoned ground
• Input Type: Differential
• Sensor Compatibility:
  • Magnetic
  • Active
  • Open collector
• Maximum Operating Voltage: ±33 V DC
• Minimum Operating Voltage:
  • Differential:
    • 500 mV P-P, 2 Hz to 32,000 Hz
    • 1 V P-P, 0.5 Hz to 2 Hz
  • Single-ended:
    • 1 V P-P, 2 Hz to 32,000 Hz
    • 2 V P-P, 0.5 Hz to 2 Hz
• Speed Range: 0 to 32,000 RPM
• Input Frequency Range: 0.5 Hz to 32 kHz
• Duty Cycle: 20% to 80%, or 10 µs minimum pulse width
• Maximum Continuous Slew Rate:
  • 4,000 Hz/sec with 60 gear teeth
  • 4,000 RPM/sec with 60 gear teeth
• Number of Gear Teeth: 1–255
• Termination Resistor: Baseplate configurable
• Pull-up Resistor: Baseplate configurable
• Resolution: 24 bits
• Absolute Error:
  • ±0.01% for 2,000 to 32,000 Hz
  • ±0.1% for 0.5 to 2,000 Hz
• Measurement Algorithm: Gear multiple tracking
• Diagnostic: Precision reference test
• Minimum Scan Update Rate: 20 ms
• Functional-to-Protective-Earth Isolation: 500 V DC minimum
• Functional-to-Functional-Earth (Logic) Isolation: 800 V DC minimum