ABB SPHSS13 Hydraulic Servo Control Module

Technical Specifications

Model: SPHSS13

Brand: ABB Bailey

Product Type: Hydraulic servo control module

Control Algorithm: PI / Proportional‑only control

Position Feedback: Redundant AC/DC LVDT interface

Drive Output: Servo coil driving signal

Backplane Bus: Symphony Plus Harmony rack bus

Supply Voltage: 24 V DC

Operating Temperature: ‑20℃ ~ +70℃

Protection Class: IP20

Mounting: Harmony rack slot installation

Core Function: Real‑time closed‑loop position regulation for turbine hydraulic valves

Product Details

The SPHSS13 is a dedicated hydraulic servo driver belonging to ABB Symphony Plus (Bailey Infi90‑Harmony) series, it acts as critical turbine DEH control card for steam turbine digital electro‑hydraulic control system. It converts valve position setpoint issued by DCS host into driving signals for hydraulic servo valve, realizing accurate position adjustment of main steam valve and governing valve in thermal power units.

This module supports redundant LVDT position feedback access, dual‑channel position signal sampling improves anti‑failure capability for valve closed‑loop control. Users can select PI or pure proportional control algorithm according to site unit characteristics, optimizing response curve for different hydraulic actuators. Independent signal demodulation circuit processes feedback signals locally, reducing real‑time computing burden of upper‑level DCS controller.

Built‑in comprehensive self‑diagnosis mechanism can detect LVDT loop breakage, servo coil abnormality and module hardware failure. Fault status will be uploaded to DCS human‑machine interface through backplane bus, helping maintenance staff capture hidden risks ahead of valve malfunction. Front‑panel indicator lights offer intuitive hardware status hints for daily inspection work.

Designed for standard Harmony rack slot installation, it matches perfectly with Symphony Plus system hardware architecture. Mainly deployed in thermal power plant DEH system, also applicable for hydraulic actuator regulation of large‑scale compressor and gas turbine auxiliary equipment. It is essential functional board for unit overhaul, valve control loop modification and aging servo component replacement of legacy Bailey DCS power plant systems.