IS200TRPAH1AFB

About the IS200TRPAH1AFB

The IS200TRPAH1AFB model is labeled a Turbine Primary Trip model as part of the Mark VI series. The Mark VI series, and thus the IS200TRPAH1AFB model, was manufactured by General Electric. The TRPA model is used with YTUR or PTUR I/O packs and TTUR terminal boards. It is used to produce different inputs and outputs. Some of the inputs and outputs of the TRPA model are twelve passive pulse rate devices that will sense a toothed wheel; the toothed wheel measures the turbine speed; depending on the system type the IS200TRPAH1AFB model is used with, there can be six active pulse rate inputs when used in Triple Modular Redundant sections, two for each of the TMR sections. Another I/O type that the TRPA model will produce is one 24-125 Vdc fail-safe ESTOP input which can remove power from associated trip relays. 

There are specific models that the IS200TRPAH1AFB model can be used with based on the board revision. This model can be used with IS20PTUR models, but due to its H1A revision, it cannot be used with IS200YTUR models. There are slight functional differences between the IS200TRPAH1AFB and TRPAH2A models; this model has a 24 Vdc output contact rating, while the TRPAH2A models have an output contact rating of 125 Vdc. 

During the operation of the IS200TRPAH1AFB model failures can occur. If the model is being used in 240 Vac applications, the most likely cause for failure is due to inadvertent connections between the 125 Vdc and ac voltage creation. When creation occurs with the dc and ac voltages, the sum of the peak ac voltage and the 125 Vdc will be applied to MOVs connected between the ground and the dc voltage. When being used in 120 Vac applications, however, the MOV rating is able to withstand the peak voltage without a failure occurring.