The ABB IMHSS03 Hydraulic Servo Module is designed for turbine control systems in ABB’s Symphony Plus and Infi 90 platforms. It provides precise actuation by converting controller setpoints into servo valve drive currents, while simultaneously reading back position signals from LVDTs (Linear Variable Differential Transformers). This closed-loop control ensures accurate valve positioning and stable turbine operation.
Technical Specifications
Specification
Value
Model Number
IMHSS03
Manufacturer
ABB
Product Type
Hydraulic Servo Module
System Compatibility
Symphony Plus / Infi 90 DCS
Primary Function
Valve position control for hydraulic servos
Inputs
LVDT feedback signals
Outputs
Current drive signals to servo valves
Control Features
Closed-loop position control, gain tuning, fault buffering
Mounting
Harmony rack slot (one MMU slot)
Dimensions
Approx. 120 × 80 × 60 mm
Weight
~2 kg
Operating Temperature
0 to 55°C
Storage Temperature
-40 to 85°C
Compliance
CE, RoHS
Country of Origin
Switzerland
Warranty
12 months
Functional Highlights
Provides precise valve position control for turbine hydraulic servos.
Interfaces with LVDT sensors for accurate feedback.
Supports closed-loop control with onboard CPU handling gain tuning and fault management.
Integrates seamlessly into ABB Harmony racks and communicates via the INFI 90 bus.
Ensures reliable turbine governor operation with sub-second response times.
Application Scenarios
Steam turbine control in power generation plants.
Gas turbine governor systems requiring precise hydraulic actuation.
Industrial facilities using ABB Symphony Plus for turbine monitoring and control.
FAQ
Q: What is the main function of the IMHSS03? A: It controls hydraulic servo valves by modulating current outputs and processing LVDT feedback for closed-loop valve positioning.
Q: Which systems support IMHSS03? A: It is compatible with ABB Symphony Plus and Infi 90 DCS platforms.
Q: How is the module installed? A: It occupies a single slot in the Harmony rack and connects to its termination unit for field wiring.
