The 505DR® Dual Redundant Turbine Controller is a state-of-the-art digital control platform designed to reliably control and protect single-valve and single-pump steam turbines.

The benefits of dual redundancy maximise turbine reliability and availability.

Redundancy is managed at the operating system level using Woodward’s RTN (Real Time Network), allowing ultra-fast switching and ‘bufferless’ transitions.

The controller utilises the same unique PID architecture as the proven 505XT, making it the ideal controller for controlling speed, load,

parameters such as pumping collector pressure, exhaust collector pressure or connection line power. The dual redundant version inherits features such as the Opti-Tune self-tuning PID and ratio limiter.

The controller includes the following turbine protection features to ensure that the turbine and its driven loads (compressors, pumps, generators) operate within design limits:

– 3 critical speed avoidance bands

– Overspeed prediction and shutdown protection

– Configurable under- or over-pressure shutdown logic

– Minimum and maximum speed and load settings

– Maximum low-pressure stage overpressure limitation

– Minimum high pressure stage flow limiting

Ethernet and serial communications allow for easy integration into plant controls or process control systems.

The 505DR can be configured with an optional integrated user interface, including an 8.4-inch multi-language graphical display.

Description

Like the MicroNet Plus, the 505XT system designates one controller as the System Controller (Syscon), actively controlling the fan.

The second device is configured as a www.cniacs.com backup. The system automatically evaluates the health of the Syscon and initiates a fast switchover in the event of a failure.

Switchover can also be initiated manually. The system closely synchronises the Syscon’s software status and memory with the backup, ensuring that the control output remains stable and does not affect turbine operation (a true ‘bufferless’ switchover).

If the optional HMI version is selected, the display and keypad are redundant (input from either keypad will command Syscon, and the display can be independently selected to show different screens.

For example, one screen can display speed and speed settings, and another can display a steam map.

Woodward’s optional RemoteView programme allows remote monitoring from any networked PC.

The programme can be used either with the rear panel mounted version (as the main HMI) or as an additional remote monitor to the HMI version.

The optional FTM (Field Terminal Module) allows easy multiplexing of redundant signals and facilitates fast installation and commissioning.