IS200TRLYH1D

About the IS200TRLYH1D

The IS200TRLYH1D is a board (PCB) manufactured by GE for the Mark VI system.  Designed for speed control during startup, the MKVI is one of the last “Speedtronic” systems released by GE.  The Mark VI offers turbine load control during normal operation and protection against turbine overspeed in situations where there is a loss of load.  The MKVI also offers automatic generator synchronization. The system is designed to manage both large turbine applications and small ones and can be designed either as a TMR (triple modular redundant) system or in Simplex form.

The IS200TRLYH1D functions as a Relay Output terminal board with Solenoid Integrity Sensing.  This board has six plug-in magnetic relays. These circuits are Form-C contact outputs that are fused and powered to drive external solenoids.  Bad solenoids can be detected through special feedback provided on each relay circuit.

The  IS200TRLYH1D is similar to a TRLYH1B board.  However, this board has only six relays and is designed for 24/125V dc applications only.  The relays cannot be configured for dry contact use, and input relay coil monitoring has been removed. The board is typically controlled by the VCRC or VCCC board. It supports either TMR or simplex applications.  

The  IS200TRLYH1D is populated by a large terminal board with 24 screw connections and a small terminal board with four screw connections.  The board has twelve fuses, and six relays (previously mentioned.) There are four connectors, marked as JA1, JR1, JS1, and JT1. The board uses the JA1 connector for simplex applications and the JR1 through JT1 connectors for TMR applications. There are also three plug connectors on the board surface.  The IS200TRLYH1D is populated by a metal oxide varistor and a clamp diode for transient suppression.