Westinghouse 1C31227G01 Digital Input Module

Westinghouse 1C31227G01 Digital Input Module

Technical data of product parameters

 There are 60 teeth in the speed sensor’s gear. With a 50 millisecond loop
time and with the equipment operating at 10,000 Hz, the largest speed Speed1C31227G01
Detector module Pulse Count per Update setting (written to register 0EH) is 500.
The largest integer multiple of 60 teeth that is less than the maximum pulse count
per update setting of 500 is 8. Therefore a Pulse Count per Update value of 8 x 60
= 480 should be written to register 0EH as the Pulse Count per Update. The Pulse
Count per Update is set to 480 in order to be a multiple of the number of teeth in the 1C31227G01
gear. The Pulse Count per Update setting of 480 provides an update every (480/
10,000 = 48 milliseconds) which is fast enough for a 50 millisecond control loop.
For this example, a value of 01EOH (480) should be written to the Speed Detector.The Digital Electro-Hydraulic (DEH) system controls steam turbine valve positions
in order to adjust steam flow for turbine speed control, or to change generator load
when connected to the grid.
The Ovation Valve Positioner I/O module provides an interface between the DEH 1C31227G01
Ovation Controller and an electro-hydraulic servo valve actuator. Valve styles
controlled by the Ovation Valve Positioner I/O module include throttle valves,
governor valves, interceptor valves, extraction valves, and bypass valves. The
Ovation Valve Positioner module provides closed-loop valve positioning control.
A valve position set point is maintained by the module. The set point is normally 1C31227G01
altered by the Ovation Controller via the Ovation I/O bus. If the Ovation Valve
Positioner module operates in Local Manual mode, the set point is controlled by a
SLIM operator interface station. Inside the electronics module, an 80C196
microcontroller provides real-time closed loop proportional-plus-integral (PI)
control

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