Manual 35018V1 505XT Digital Control System for Steam Turbines
Woodward 168
Auxiliary Control Screen
Figure 5-15. Auxiliary Control Screen
The Auxiliary Control screen will adapt to the configuration of the 505XT. During normal run operation,
this screen provides the user with all details that are related to the auxiliary control loop. The auxiliary
control output goes to the LSS bus and can directly affect the HP valve demand output. This can be
configured as a limiter or a controller. If it is a limiter it will always be enabled and provide protection
related to the process variable being used for this function. When configured as a controller it will disable
the speed PID whenever it is enabled.
The menu bar functions will allow the user to access a number of other screens that are related to
auxiliary control, such as directly entering a setpoint, access to the valve limiter, or adjusting auxiliary
control dynamic settings.
Inlet Control Screen
Figure 5-16. Inlet Steam Pressure Control Screen
The Inlet Pressure Control screen will adapt to the configuration of the 505XT. During normal run
operation, this screen provides the user with all details that are related to the inlet pressure control loop.
This can be configured as a limiter or a controller, depending on the turbine type.
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