IS200TREGH1B is a Turbine Emergency Terminal Board manufactured and designed by General Electric and is part of the Mark VI series used in gas turbine control systems. Three emergency trip solenoids are powered by TREG, which is managed by the I/O controller. The TREG and TRPG terminal boards can be wired together to accommodate up to three trip solenoids. TRPG supplies the negative side of the solenoids' dc power, whereas TREG supplies the positive side. The TREG's 12 relays, nine of which form three groups of three to vote inputs controlling the three trip solenoids, are controlled by the I/O controller, which also performs emergency Overspeed protection and emergency stop operations.
For 125v dc applications, H1B is the most common variant. To produce redundant power on the board for status feedback circuits and powering the economizing relays, control power from the JX1, JY1, and JZ1 connectors are diode combined. For the trip relay circuits, power isolation is kept. The TREG terminal board and PPRO are compatible with Mark VI systems. TREG is connected to the PPRO module by cables with molded plugs.
