IMFCS01 Frequency Counter Module

Overview

The IMFCS01 Frequency Counter module provides a single channel frequency input to a Harmony controller. The controller utilizes function code 145 (frequency counter) to configure and access the module input channel. The module conditions, converts, and processes pulse inputs from a magnetic pickup attached to the front standard of a steam or gas turbine. The converted digital data represents a count of the input pulses and the period of the count. The controller uses the data to calculate frequency and consequently turbine speed. The calculated speed can then be used to drive servo valve outputs for turbine speed control. The IMFCS01 module provides exceptional frequency counting accuracy required by steam or gas turbine control systems. This module is an intelligent I/O module with an onboard microprocessor, memory, and communication circuitry. In most applications, the IMFCS01 module works with the IMHSS03 Hydraulic Servo module.

Property Characteristics/Values

• General

  • Mounting: Occupies one slot in a standard module mounting unit.

• Environmental

  • Ambient temperature: 0° to 70°C (32° to 158°F)
  • Relative humidity: 5% to 95% up to 55°C (131°F) (noncondensing)
  • 5% to 45% at 70°C (158°F) (noncondensing)
  • Altitude: Sea level to 3 km (1.86 miles)
  • Air quality: Noncorrosive
  • Surge protection: Meets IEEE-472-1974 surge withstand capability test.

IMHSS03 Power Requirements and Outputs

• Power Requirements

  • Operating voltage: +5 VDC, ±5% at 576 mA typical
  • +15 VDC, ±5% at 15 mA typical
  • -15 VDC, ±5% at 12 mA typical
  • +24 VDC, ±10% at 335 mA typical (from termination unit)
  • Power dissipation: 2.88 W (+5 VDC) typical, 0.23 W (+15 VDC) typical, 0.18 W (-15 VDC) typical, 8.04 W (24 VDC) typical

• Outputs

  • LVDT secondary 2-position inputs: 4 analog inputs total, 2 LVDT secondary inputs (each with 2 secondaries)
  • LVDT supply primary excitation outputs: 2 analog outputs: LVDT primary 1 and 2, Operating frequency: 400 Hz to 15 kHz
  • Servo valve coil outputs: 4 analog outputs total, 2 redundant analog outputs (selectable) with servo output protection. Shorting or opening 1 output does not affect the other output.
  • Position panel meter output: Output current: 1 analog output (scaled feedback output) 4 to 20 mA at 300 Ω maximum impedance