IS200TREGS2B is a Turbine Emergency Trip Board manufactured and designed by General Electric as part of the Mark VIeS series used in GE distributed Gas Turbine Control Systems. The Gas Turbine Emergency Trip (TREG) terminal board provides power to three emergency trip solenoids and is controlled by the YPRO. Up to three trip solenoids can be connected between the TREG and TRPG terminal boards. TREG provides the positive side of the dc power to the solenoids and TRPG provides the negative side. YPRO provides emergency overspeed protection, and emergency stop functions, and controls the 12 relays on TREG, nine of which form three groups of three to vote inputs controlling the three trip solenoids.
The following board types are compatible with the YPRO in a Mark VIeS SIS:
S1B is the primary version for 125 V dc applications. Control power from the JX1, JY1, and JZ1 connectors are diode combined to create redundant power on the board for status feedback circuits and powering the economizing relays. Power separation is maintained for the trip relay circuits.
S2B is used for 24 V dc applications. All other features are the same as S1B
In redundant TREG applications, it is typical to find one H3B and one H4B board used together. System repairs must be done with the correct board type to maintain the control power separation designed into these systems. In Mark VIe systems, TREG is controlled by the PPRO pack on SPRO. The PPRO I/O packs plug into the D-type connectors on SPRO. Cables with molded plugs connect TREG to the SPRO board.
Installation
The three trip solenoids, economizing resistors, and the emergency stop are wired directly to the first I/O terminal block. Up to seven trip interlocks can be wired to the second terminal block.
Operation
TREG is entirely controlled by the I/O controller, and the only connections to the control modules are the J2 power cable and through the trip solenoids. In simplex systems a third cable carries a trip signal from J1 to the TSVO terminal board, providing a servo valve clamp function upon turbine trip.
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