ABB SPHSS03 Hydraulic Servo Module

ABB SPHSS03 Hydraulic Servo Module

Functional Description

The SPHSS03 hydraulic servo module is a valve position control module. It provides an interface through

which a HR Series controller can drive a servo valve or I/H converter to provide manual or automatic control

of a hydraulic actuator. 

Typical areas of use for the SPHSS03 module are positioning the steam turbine throttle and control valves,

gas turbine fuel valves, inlet guide vanes and nozzle angle. By regulating the current to the servo valve, it can

initiate a change in actuator position. The hydraulic actuator can then position, for example, a gas turbine

fuel valve or a steam governor valve. As the valve opens or closes, it regulates fuel or steam flow to the

turbine, thus controlling the turbine speed. A linear variable differential transformer (LVDT) provides actuator

position feedback to the hydraulic servo module. The SPHSS03 module interfaces to AC LVDTs.

The SPHSS03 is an intelligent I/O device with an onboard microprocessor, memory and communication

circuitry. In most applications, the SPHSS03 will work in coordination with a speed detection module

(SPFCS01, SPTPS02 or SPTSA01) to form the turbine governor system.

Technical Specifications