The Harmony rack I/O system comprises various input and output devices that interface process signals with the SymphonyTM Enterprise Management and Control System. The system includes specific modules like the IMHSS03 Hydraulic Servo and the IMFCS01 Frequency Counter, which facilitate field inputs and outputs for turbine control.

IMHSS03 Hydraulic Servo Module

The IMHSS03 is a valve position control module designed to interface with a Harmony controller, allowing manual or automatic control of a hydraulic actuator, using function codes 55 or 150 (hydraulic servo). It is utilized for positioning steam turbine throttle and control valves, gas turbine fuel valves, inlet guide vanes, and nozzle angles. The IMHSS03 regulates the current to a servo valve, initiating changes in actuator position, thereby controlling fuel or steam flow to manage turbine speed. It incorporates an onboard microprocessor, memory, and communication circuitry.

Specifications of IMHSS03 Module

• 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) (non-condensing); 5% to 45% at 70°C (158°F) (non-condensing)
  • Altitude: Sea level to 3 km (1.86 miles)
  • Air quality: Noncorrosive
  • Surge protection: Meets IEEE-472-1974 surge withstand capability test.
• 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: Varies based on voltage, with typical values specified for each.
• Inputs and Outputs (I/O):
  • LVDT Secondary Inputs: 4 analog inputs, 2 LVDT secondary inputs with specified voltage and impedance.
  • LVDT Primary Excitation Outputs: 2 analog outputs with a specified operating frequency.
  • Servo Valve Coil Outputs: 4 analog outputs with protections against shorting or opening.
  • Various Analog Outputs: Position panel meter output, I/H converter output, unscaled position feedback output, test mode output with specific current and impedance values.
  • Digital Inputs: 3 optically isolated contact inputs with specified voltage and current values for ‘On’ and ‘Off’.
  • Digital Output: 1 independent, optically isolated open collector output with defined voltage and current for ‘On’ and ‘Off’ states.

Certifications and Compliance

• CE Mark Declaration: Complies with specific Directives/Standards for CE marking regarding EMC and Low Voltage Directives.
• Certifications: Certified for use as process control equipment in nonhazardous locations by CSA. Approval from Factory Mutual (FM) is pending for specific categories.

The IMHSS03 module plays a critical role in turbine control by enabling precise positioning of various valves and actuators, thereby regulating the flow of steam or fuel to manage the turbine’s speed.

FAQs

Q: What are the key features of the ABB IMHSS03 Hydraulic Servo Module?

A: The IMHSS03 module offers advanced control, high power output, fast response, compact design, and an intuitive interface.

Q: In which industries can the IMHSS03 Hydraulic Servo Module be used?

A: The module finds applications in machine tools, industrial robotics, material handling, injection molding, and testing equipment.

Q: What are the technical specifications of the IMHSS03 Hydraulic Servo Module?

A: The module operates on a 24V DC power supply, provides a maximum output current of 10A, and offers analog and digital control interfaces.

Q: What benefits does the IMHSS03 Hydraulic Servo Module provide?

A: The module ensures high performance, reliability, efficiency, versatility, and user-friendliness in hydraulic servo systems.

Q: How does the IMHSS03 Hydraulic Servo Module contribute to system optimization?

A: The module enables precise control, minimizes downtime, improves energy efficiency, and enhances productivity in various applications.