Woodward 9987-828 Rev. D Spm-A Synchroniseur

The 505E controller is

designed to operate

single-extraction

and/or admission

steam turbines of all

sizes and

applications. This

steam turbine

controller includes

specifically designed

algorithms and logic

to start, stop, control,

and protect singleextraction

and/or

admission steam

turbines or turboexpanders,

driving generators, compressors, pumps, or industrial fans. The 505E

control’s unique PID structure makes it ideal for applications where it is required to

control steam plant parameters like turbine speed, turbine load, turbine inlet

pressure, exhaust header pressure, extraction or admission header pressure, or tieline

power.

The control’s special PID-to-PID logic allows stable control during normal turbine

operation and bumpless control mode transfers during plant upsets, minimizing

process over- or undershoot conditions. The 505E controller senses turbine speed

via passive or active speed probes and controls the steam turbine through HP and

LP actuators connected to the turbine steam valves.

The 505E controller senses extraction and or admission pressure via a 4–20 mA

transducer and uses a PID through a ratio/limiter function to accurately control

extraction and/or admission header pressure, while protecting the turbine from

operating outside of its designed operating envelope. The controller uses the specific

turbine’s OEM steam map to calculate its valve-to-valve decoupling algorithms and

the turbine operating and protection limits.

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