Overview

The Harmony Rack I/O system is designed to interface process signals with the Symphony™ Enterprise Management and Control System. It includes various input and output devices, such as the IMHSS03 Hydraulic Servo Module and the IMFCS01 Frequency Counter Module, which are specifically used for turbine control. Each module consists of a single printed circuit board (PCB) that occupies one slot in the Module Mounting Unit (MMU).

The configuration of the modules and their input/output (I/O) channels is typically done through jumpers and switches on the PCB and additional dipshunts on the termination unit. A cable connects the I/O module to its corresponding termination unit, where the field wiring is connected.

Specifications

Power Requirements

• Operating Voltage:
  • 5 VDC at 241 mA (typical)
  • 15 VDC at 6.88 mA (typical)
  • -15 VDC at 5.39 mA (typical)
• Power Dissipation:
  • 1.2 W (5 VDC)
  • 185 mW (±15 VDC)

Input Specifications

• Voltage Range:

  • 300 mVPP to 120 VRMS (150 mVP to 170 VP)

• Frequency Response:

  • 1 frequency input channel
  • 1 Hz to 12.5 kHz

• Accuracy:

  • ±0.25 Hz (1 Hz to 5 kHz)
  • ±0.50 Hz (5 kHz to 10 kHz)
  • ±0.63 Hz (10 kHz to 12.5 kHz)

• A-to-D Resolution:

  • 24 bits

• Module Time Base:

  • Frequency: 1 MHz
  • Accuracy: 0.005%
  • Count: ±1 of the time base