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This hydraulic servo module provides precise control for ABB Bailey INFI 90 turbine systems. It drives proportional servo valves for steam turbine governor and bypass control. Therefore, it enables accurate speed and load regulation for power generation applications.
Physical and Control Specifications
The ABB Bailey IMHSS02 measures 25.0 cm in length and 18.0 cm in width. Moreover, its module weight equals approximately 0.94 kg for rack mounting. A single 48-pin male connector links this module to the INFI 90 backplane. Additionally, the module includes two independent servo output channels.
| Parameter | Specification |
|---|---|
| Brand | ABB Bailey |
| Full Model | IMHSS02 |
| Category | Hydraulic Servo Module |
| Dimensions (L x W x H) | 25.0 cm x 18.0 cm x 5.5 cm (9.84″ x 7.09″ x 2.17″) |
| Module Weight | 0.94 kg (2.07 lbs) |
| Backplane Interface | 1 x 48-pin Male Connector (INFI 90 Rack) |
| Power Supply Input | 5 VDC from Backplane (0.8 A Typical) + 24 VDC External |
| Power Consumption | 4.0 W + 15 W (External) |
| Processor Type | 16-bit Microcontroller (20 MHz) |
| Program Memory | 64 kB ROM (Firmware) |
| Data Memory | 32 kB RAM (Battery Backed) |
| Backup Battery | Internal Lithium (3V, 5 Year Life) |
| Servo Output Channels | 2 Independent Channels |
| Output Signal Type | ±10 VDC or ±20 mA (Selectable) |
| Output Resolution | 14 Bits (0 to 16383 Counts) |
| Output Ramp Time | 0 to 60 Seconds (Programmable) |
| Output Impedance (Voltage) | 10 Ω (Typical) |
| Output Impedance (Current) | 500 Ω (Typical) |
| Maximum Output Current | 25 mA per Channel |
| Feedback Inputs | 4 Differential Channels (LVDT or Potentiometer) |
| Feedback Resolution | 14 Bits (0 to 16383 Counts) |
| Control Algorithm | PID + Position + Velocity + Acceleration |
| Update Rate | 2 ms per Channel |
| On-Board Components | 1 Microcontroller + 3 Memory Chips + 2 DAC Chips + 2 Signal Conditioners + 4 Protection Diodes + 2 Isolation Amplifiers + 1 Voltage Regulator + 1 Real-Time Clock |
| Energy Storage | 4 x 100 µF Electrolytic Capacitors (35V) + 2 x 10 µF Tantalum (25V) + 1 x CR2032 Backup Battery |
| Battery Backup Time | 5 Years (Typical for RAM and RTC Retention) |
| Isolation Rating | 1500 Vrms (Outputs to Backplane) |
| Operating Temperature | 0°C to +55°C (32°F to 131°F) |
| Storage Temperature | -25°C to +85°C (-13°F to 185°F) |
| Mounting Type | INFI 90 Rack (Single Slot) |
| Status Indicators | 1 Green LED (Power) + 1 Green LED (Run) + 2 Green LEDs (Output Active) + 2 Yellow LEDs (Feedback Valid) + 1 Red LED (Fault) |
Hydraulic Servo Control Features
The ABB Bailey IMHSS02 drives proportional servo valves for steam turbine control. Specifically, it generates ±10 VDC or ±20 mA signals for valve positioners. In addition, the 14-bit resolution provides precise control of valve opening. Moreover, programmable output ramps prevent sudden valve movements during startup. Furthermore, the PID algorithm maintains accurate position based on feedback sensors. Consequently, this module enables smooth speed and load control for steam turbines.
Feedback Inputs and Position Control
Two independent servo channels each include two differential feedback inputs. For instance, LVDT or potentiometer sensors provide actual valve position feedback. In addition, the module supports position, velocity, and acceleration control modes. Moreover, the 14-bit feedback resolution ensures precise monitoring of valve movement. Furthermore, the update rate of 2 milliseconds responds quickly to control changes. Thus, the ABB Bailey IMHSS02 provides closed-loop servo control for critical turbine valves.
Energy Storage and Control Stability
This hydraulic servo module stores energy using six onboard capacitors for power filtering. Specifically, four electrolytic capacitors smooth the 24 VDC supply for servo amplifiers. In addition, two tantalum capacitors provide high-frequency noise suppression for feedback circuits. Moreover, a lithium battery retains tuning parameters and configuration settings. Furthermore, a real-time clock logs position events for diagnostics. Therefore, this module maintains control stability during brief power interruptions.
Installation and Diagnostic Indicators
Seven LED indicators provide operational status at a glance on this module. First, a green Power LED lights when the backplane supply voltages are present. Second, a green Run LED flashes during normal control execution. Third, two green Output Active LEDs illuminate when each servo channel is enabled. Fourth, two yellow Feedback Valid LEDs light when each position sensor signal is within range. Finally, a red Fault LED indicates output overload, feedback loss, or configuration errors. Additionally, the module includes a locking ejector for secure backplane insertion. Thus, you can diagnose servo status instantly without external test equipment.
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