ABB IMHSS03 hydraulic servo module
The ABB IMHSS03 hydraulic servo module is a valve position control module for the INFI 90® system to control the speed of the turbine.
It is connected to a servo valve or an I/H converter IMMFP01, IMMFP02 or IMMFP03 multifunctional processor module. The Multi-function processor (MFP) module controls the position of the steam or gas turbine throttle by sending position requirements to the hydraulic servo (HSS) module. The HSS module drives its output to open or close the throttle to match the position requirements. The MFP module uses the IMFCS01 frequency counter module to measure turbine speed. The frequency counter module measures turbine speed by counting and timing pulses on magnetic pickups on the turbine shaft. The MFP module uses this count to calculate the turbine speed and calculate new requirements based on the set value.
The IMHSS03 module is a compatible replacement for the IMHSS01 and IMHSS02 modules with performance enhancement mans. The IMHSS03 module automatically adjusts its demodu delay gain to provide a better response.
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