IS200VRTDH1BBA

Product Description

The IS200VRTDH1BBA model is a Resistance Temperature I/O Processing Device (RTD) manufactured by General Electric for the Mark VI system. This model can only be used in a Triple Modular Redundant system, indicated by the H1B within the model number. The VRTD model provides redundant RTD inputs; this will be done by fanning the inputs to the VRTD boards located in the R, S, and T racks. The associated inputs will meet the same environment codes, suppression, function, and code requirements as the TRTDH1C terminal board. While the requirements and functions are the same as the TRTDH1C, the fast scan is not available on this unit. 

All of the RTD signals that are available on the IS200VRTDH1BBA model are equipped with high-frequency decoupling to the ground when the signal has entered the model. The RTD inputs on the VRTD board can multiplex with the VRTD models and will be coordinated by redundant pacemakers, so if a loss of the VRTD board or loss in cables occurs, it will not cause a loss of any RTD signals within the control database. The VRTD boards are used in conjunction with the IS200VRTDH1BBA to ensure that all of the RTD inputs will be simultaneously read in the R, S, and T racks but will be skewed by two RTDs so the racks are reading the RTD inputs together. 

One of the components on the VRTD board is several LEDs; the LEDs are located on the front panel of the VRTD board. These LEDs are used to provide status information. The LEDs indicate the RUN and FAIL conditions; the FAIL LED will be solid red, with the RUN LED flashing green. The third LED is typically off, but if a diagnostic alarm condition occurs on the board, it will be a steady orange. 

For more information on the features of the IS200VRTDH1BBA board and how its used within the Mark VI system, it is best to refer to the General Electric Mark VI Turbine Control System GEH-6421.