Bailey IMHSS03 I/O Incorporates Module

Bailey IMHSS03 I/O incorporates Module

IMHSS03 Description

Harmony rack I/O incorporates a variety of input and output devices to interface process signals to the SymphonyTM Enterprise Management and Control System.

An IMHSS03 Hydraulic Servo module and an IMFCS01 Frequency Counter module interface field inputs and outputs used in turbine control.

The modules each consist of a single printed circuit board that occupies one slot in a module mounting unit (MMU).

In general, jumpers and switches on the printed circuit board and jumpers and dipshunts on the termination unit configure the module and its I/O channels.

A cable connects the I/O module to its termination unit.

The physical connection points for field wiring are on the termination unit.

IMHSS03 Hydraulic Servo

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.

IMFCS01 Frequency Counter

The IMFCS01 Frequency Counter module provides a single channel frequency input to a Harmony controller.

The controller utilizes function code 145 (frequency counter) to configure and access the module input channel.

The IMFCS01 module conditions, converts, and processes pulse inputs from a magnetic pickup attached to the front standard of a steam or gas turbine.

The converted digital data represents a count of the input pulses and the period of the count.

The controller uses the data to calculate frequency and consequently turbine speed.

The calculated speed can then be used to drive servo valve outputs for turbine speed control.

The IMFCS01 module provides exceptional frequency counting accuracy required by steam or gas turbine control systems.

The IMFCS01 module is an intelligent I/O module with an onboard microprocessor, memory, and communication circuitry.

In most applications, the IMFCS01 module works with the IMHSS03 Hydraulic Servo module.

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