WOODWARD 8200-1301 505 Digital Control

The 8200-1301 505 controller is designed to control single or dual (split range) actuator steam turbines (extraction steam turbines require the 505XT version). 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.

8200-1301 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.

8200-1301 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. Refer to Volume 2 of this manual for details on applications.

The front panel display is designed to provide the user with multiple levels of access for configuring, calibrating, tuning, operating and monitoring the turbine operation. No additional control panels are required to operate the turbine, every turbine control function can be performed from the 505's front panel.

Hard Key Commands

NUMERIC KEYPAD = These are available for entering numeric values or text strings directly into the control when a configurable or programmable edit field has been selected. The bottom row of keys have some special features.

This is a backspace and delete (used when entering text)

In text mode this functions as a Shift key. When making analog adjustments with the ADJUST key – pressing this key at the same time as the ADJUST will invoke a 'Fast' rate of adjustment

Brightness key – hold this down and then use the ADJUST key to increase/decrease the screen brightness