ABB Bailey IMHSS03 Hydraulic Servo Module
Description:
IMHSS03 provides an interface through which a Harmony controller can drive a servo valve or I/H converter to provide manual or automatic control of a hydraulic actuator. The controller utilizes  function code 55 or 150 (hydraulic servo) to configure and access the module input/output channels.
Typical uses for the module are positioning of steam turbine throttle and control valves, gas turbine
fuel valves, inlet guide vanes, and nozzle angle. By regulating the current to the servo valve, the IMHSS03 module 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 IMHSS03 module is an intelligent I/O module with an onboard microprocessor, memory, and
communication circuitry. In most applications, the IMHSS03 module works with the IMFCS01  Frequency Counter module.
Related items:
PM154(3BSE003645R1) 
BB150(3BSE003616R1) 
IMASO11
IMFEC12
INICT01
INICT03A
NIMP01
IMDSI14
IMASI23
IMCIS22
IMDSM04
IMHSS03