Marketed by General Electric as a VTUR termination barrier board the IS200TTURH1BBA model has four different input and output (I/O) types that are used when operating. These I/O types are as follows:
All of the above I/Os have individual and unique characteristics as well. In relation to the pulse rate (speed) I/Os, they are typically known as magnetic speed sensors and operate at two to fourteen thousand Hertz. Models within the Mark VI System have several application-specific I/Os, this model is used with a synchronizing I/O. When operating as such there are three types of synchronizing which are backup synch protection, automatic synchronization, and manual synchronization.
As mentioned above the IS200TTURH1BBA model has two PT inputs, these two inputs are single-phase inputs and have an important function. The PT inputs are used to monitor the line busses and generator through the VTUR card. The speed at which the chosen turbine is matched occurs through the TTUR model, the line voltages and generator will need to be matched prior to closing the breaker via the TTUR command.
The IS200TTURH1BBA model also has an internal synch check relay which is labeled as K25A, if this feature is being used the potential slip calculation and backup phase must be performed on the backup protection module or through an outside backup synch check relay. The backup protection module can also be used alongside the main control module used with the TTUR board.