中文版
Description
The IMHSS03 Hydraulic Servo module is a valve position control module. It 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.
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