Woodward 8200-1302 505D Digital Governor for Steam Turbines

Woodward 8200-1302 505D Digital Governor for Steam Turbines

Functional Description

The 505 controller is designed to control single or dual (split range) actuator steam turbines. The 505 is

field programmable which allows a single design to be used in many different control applications and

reduces both cost and delivery time. It uses menu driven software to instruct site engineers on programming

the control to a specific generator or mechanical drive application. The 505 can be configured to operate

as a stand-alone unit or in conjunction with a plant's Distributed Control System. 

The 505 control has five PID controllers that can affect the demand of the inlet steam flow into the turbine;

the Speed/load PID controller, the Auxiliary PID controller, Auxiliary 2 PID controller, and the Cascade PID

controller. Depending on the configuration of the 505, these PIDs interact differently with each other.

Please refer to the Block diagrams listed later in this chapter to fully understand PID relationships. An

additional PID is available as an isolated control loop that is optional and can be used to drive an

independent Analog Output signal (that is not driving a Steam Valve) for any single loop ancillary control

that may be required (such as Seal Gas, Gland Seals, or lube oil pressure loops. When using the Isolated PID

Control, it is recommended to select the "Enable Readback Fault" option for the Analog Output channel

configured as the Isolated PID Demand. This will trigger an alarm in the 505 if a fault of the output circuit is

detected. By default, Analog Output channels are not configured to produce an alarm when the output

circuit has a fault.

The 505 drives one or two steam turbine throttle valves to control one turbine parameter at a time, and if

desired, limit turbine operation based on other parameters. The one controlled parameter is typically speed

(or load), however, the 505 could be utilized to control or limit: turbine inlet pressure or flow, exhaust (back)

pressure or flow, first stage pressure, generator power output, plant import and/or export levels, compressor

inlet or discharge pressure or flow, unit/plant frequency, process temperature, or any other turbine related

process parameter. 

Features

· Same installation/mounting as current 505

· 8.4” LCD Display (800x600) and Keypad

· (LV) input power: 18-36 Vdc input, isolated

· (HV) input power: 88-264 Vac / 90-150 Vdc, isolated

· Operating range of –30 °C to +70 °C (with display) 

Technical Specifications