This module drives servo valves or electro-hydraulic converters (I/H converters) through interfaces to realize manual/automatic position adjustment of hydraulic actuators. Meanwhile, it receives position feedback signals from Linear Variable Differential Transformers (LVDTs) to form a closed-loop control system. This ensures the position accuracy and response speed of valves, making it a core component for speed regulation and control of key equipment in industries such as power and energy.

As a classic product for hydraulic servo control in the HR Series, the SPHSS03 features high responsiveness and strong stability. It can be directly integrated into the Symphony Plus Distributed Control System (DCS) and communicates seamlessly with HR Series controllers such as BRC410 and SPC810ev. Additionally, it supports AC/DC LVDT feedback adaptation, being compatible with different types of hydraulic actuators, which meets the on-site industrial requirements for high-precision and high-reliability control.

DATA SHEET

ABB-SPHSS03.pdf

ABB Bailey SPHSS03 Hydraulic Servo Module.pdf

Performance Specifications

1. Core Control Parameters

• Control Output Type:
• Servo valve coil drive output (±300 mA continuous output, 500 mA peak)
• I/H converter output (4-20 mA or 20-160 mA)
• Feedback Signal Adaptation:
• AC LVDT: Primary excitation 24 Vpp (400 Hz-15 kHz), secondary 2-position input
• DC LVDT: Supports 0-10 V DC feedback signal
• Control Mode: Proportional control (Proportional-Only); supports manual/automatic mode switching
• Position Control Accuracy: ±0.1% full scale (based on LVDT feedback resolution, typical value @25°C)
• Response Time: Response time from input command to output drive ≤1 ms (servo valve mode)
• Linear Error: ±0.2% full scale (linearity between output current and command signal)

2. Power Supply and Power Consumption

• Operating Voltage: +5 VDC (±5%), +15 VDC (±5%), -15 VDC (±5%), +24 VDC (±10%, from termination unit)
• Typical Power Consumption:
• +5 VDC: 576 mA
• +15 VDC: 15 mA
• -15 VDC: 12 mA
• +24 VDC: 335 mA
• Total power consumption: approximately 8.0 W
• Power Supply Protection: Overcurrent protection (maximum current limit of 500 mA for servo output channels); reverse connection protection (±24 VDC input)

3. Environmental and Physical Parameters

• Operating Temperature Range: 0°C to 70°C (32°F to 158°F)
• Storage Temperature Range: -40°C to 85°C (-40°F to 185°F)
• Relative Humidity:
• 5% - 90% (non-condensing, below @55°C)
• 5% - 40% (non-condensing, @55°C - 70°C)
• Vibration Protection: 0.137 mm amplitude at 5-60 Hz; 1.0 G acceleration at 60-150 Hz (compliant with IEC/EN 60068-2-6)
• Electromagnetic Compatibility (EMC): Compliant with EN 61000-6-2 industrial environment standard; resistance to electrical fast transients: 2 kV (EN 61000-4-4)
• Dimensions and Weight: Width: 35.56 mm × Height: 177.80 mm × Depth: 298.45 mm; Net weight: approximately 0.6 kg

Advantages and Features

1. High Precision and High Responsiveness

• Fast Driving Capability: With a command response time of ≤1 ms, it can quickly respond to steam turbine load fluctuations (such as sudden drops in grid load) to avoid speed overshoot.
• Wide LVDT Compatibility: Supports both AC and DC LVDT feedback, compatible with hydraulic actuators of different brands (such as ABB, Woodward), eliminating the need for additional signal conversion modules.
• Proportional Control Optimization: The Proportional-Only control mode allows adjusting proportional gain through S+ Engineering software, adapting to hydraulic actuators of different stiffness to ensure control stability.

2. High Reliability and Safety

• Output Protection Design: The servo output channel is equipped with overcurrent protection (maximum 500 mA limit) to prevent burnout of the servo valve coil due to overload; +24 VDC power reverse connection protection prevents module damage caused by on-site wiring errors.
• Redundancy Compatibility: Supports redundant configuration with HR series controllers. When the main controller fails, the standby controller can seamlessly take over the SPHSS03 control logic to ensure uninterrupted valve control.
• Industrial-grade Environmental Adaptability: Wide temperature operating range (0-70°C) and strong vibration resistance, adapting to harsh industrial environments such as power plant steam turbine rooms and petrochemical compressor rooms.

3. Convenient Integration and Maintenance

• Seamless Integration with Symphony Plus: Communicates with the controller through the HR series Expander Bus, eliminating the need for custom communication protocols. Configuration parameters can be modified online through S+ Engineering software.
• Visual Fault Diagnosis: The module panel is equipped with "Power (P)", "Communication (C)", and "Fault (I)" indicator lights, which can quickly determine the module's power supply, communication, and internal fault status; supports reading status registers through the controller to locate issues such as LVDT faults and abnormal servo output.

Application Fields

With its high-precision hydraulic control capability, the ABB Bailey SPHSS03 occupies a core position in rotating machinery speed regulation and valve control scenarios, mainly applied in the following fields:

1. Power Industry

Steam Turbine Control: Drives the hydraulic actuators of steam turbine Governor Valves (GV) and Intercept Valves (IV). It accurately controls valve opening through LVDT feedback, adjusts steam flow, and realizes closed-loop control of steam turbine speed (3000 rpm/3600 rpm) and load.

Gas Turbine Control: Controls the hydraulic servo valves of gas turbine fuel valves and Inlet Guide Vanes (IGV), adjusts fuel supply and air intake volume, optimizes combustion efficiency, and ensures stable operation of the unit.

2. Petrochemical Industry

Compressor Control: Adapts to the hydraulic actuators of anti-surge valves and return valves of centrifugal compressors. It adjusts valve positions through the SPHSS03 to prevent compressor surge and ensure continuous compression process.

Large Pump and Valve Control: Controls the hydraulic system of the outlet control valve of high-pressure feed pumps in petrochemical plants, realizes precise adjustment of feed flow, and meets the requirements of reaction processes.

3. Energy and Power

Waste Heat Boiler Control: Adjusts the hydraulic actuator of the steam outlet valve of the waste heat boiler, matches the steam demand of the steam turbine generator set, and improves energy utilization efficiency.

Biomass Power Generation: Controls the hydraulic servo system of biomass fuel delivery valves, adapts to fluctuations in fuel characteristics, and stabilizes boiler load.

Q&A (Condensed)

Q: SPHSS03 "C" light off, unable to communicate with controller?

A:Check Expander Bus (e.g., NKTL01) for looseness; measure bus voltage (normal: +5 VDC).

Verify module address (0-63 for HR series) via S+ Engineering; reconfigure if conflicting.

Test module in a normal MMU slot: if "C" light turns on, replace original MMU.

Q: Valve controlled by SPHSS03 oscillates frequently?

A:Reduce proportional gain (e.g., 10→5) via S+ Engineering; optimize for no oscillation + fast response.

Check LVDT feedback with oscilloscope: fix shielding grounding or add filter if high-frequency noise exists.

Inspect hydraulic system: ensure oil viscosity (46# anti-wear oil) and no servo valve jamming.

Q: SPHSS03 no servo output current, valve unresponsive?

A:Confirm controller command (not 0); check logic (manual mode/trip signal).

Check "I" light: if on, read status register via S+ Engineering (Bit6=1 means overcurrent); test servo valve coil resistance (normal: 5-15 Ω) to rule out short circuit. 

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