IS200TREGS3B - Turbine Emergency Trip Terminal Board

SPECIFICATIONS:

Part Number: IS200TREGS3B
Manufacturer: General Electric
Series: Mark VI
Product Type: Turbine Emergency Trip Terminal Board
Number of Trip Solenoids: 3
Trip Solenoid rating: 125 V
Mounting: DIN-rail mounting
Technology: Surface mount
Trip interlock AC Voltage Rejection: 60 V rms
Size: 17.8 cm wide x 33.02 cm high
Operating temperature: -30 to 65�C
Repair: 3-7 Days
Availability: In Stock
Country of Origin: United States
Manual: GEH-6421l

FUNCTIONAL DESCRIPTION:

IS200TREGS3B is a Turbine Emergency Trip Terminal Board manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic Gas Turbine Control Systems. TREG provides power to three emergency trip solenoids and is controlled by the I/O controller. Up to three trip solenoids can be connected between the TREG and TRPG terminal boards. TREGS3B provides the positive side of the de power to the solenoids, and TRPG provides the negative side. The I/O controller provides emergency overspeed protection, 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. There are several board types as follows:

• The HIA version is not used for new production and is replaced by HIB. HIB is the primary version for 125v de applications. Control power from the JX1, JY1, and JZ1 connectors is 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.

• H2B is used for 24V DC applications. All other features are the same as HIB. H3B is a special version of H1B for use in systems with redundant TREG boards. Feedback circuit and economizing relay power are provided only by the JX1 connector.

• H4B is a special version of H1B for use in systems with redundant TREG boards. Feedback circuit and economizing relay power are provided only by the JYI connector.

• H5B is a special version of H1B for use in systems with redundant TREG boards. Feedback circuit and economizing relay power are provided only by the JZ1 connector. 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.

INSTALLATION:

The three trip solenoids, along with their economizing resistors and the emergency stop (E-Stop) circuit, must be wired directly to the first I/O terminal block. This direct connection ensures rapid response and reliable de-energizing of the solenoids during fault or shutdown conditions. Correct polarity, secure terminations, and proper resistor ratings must be verified to prevent overheating, nuisance trips, or failure to trip when required.

Up to seven independent trip interlocks can be connected to the second terminal block. These interlocks typically include protective devices such as temperature, pressure, vibration, or overspeed switches, wired as dry contact inputs according to the control logic. After installation, all wiring should be checked for continuity, correct labeling, and proper operation to ensure safe and dependable shutdown performance.

OPERATION:

The TREG terminal board is fully controlled by the I/O controller, with no direct control module interaction other than the J2 power cable and the connections through the trip solenoids. In simplex systems, an additional cable carries a trip signal from J1 to the TSVO terminal board, enabling a servo valve clamp function when a turbine trip occurs. This ensures immediate hydraulic response and secure shutdown of the turbine during fault conditions.

CONTROL OF TRIP SOLENOIDS:

Both TRPG and TREG boards have the capability to control the trip solenoids, allowing either board to remove power and activate the hydraulic system to close steam or fuel valves. The nine trip relay coils on TREG receive 28 V DC from the I/O controller, while the trip solenoids are powered with 125 V DC through plug J2. Each solenoid draws up to 1 A with a 0.1-second L/R time constant, ensuring rapid actuation during trip events and reliable shutdown performance.

Two series contacts from each emergency trip relay (ETR1, 2, 3) are connected to the positive 125 V dc feeder for each solenoid, and two series contacts from each primary trip relay (PTR1,2,3 in TRPG) are connected to the negative 125 V dc feeder for each solenoid. An economizing relay (KE1, 2, 3) is supplied for each solenoid with a normally closed contact in parallel with the current-limiting resistor. These relays are used to reduce the current load after the solenoids are energized. The ETR and KE relay coils are powered from a 28 V de source from the I/O controller. Each PPRO I/O pack in each of the R8, S8, and T8 sections supplies an independent 28 V dc source.

WOC maintains one of the industry�s largest inventories of OEM replacement parts for GE Speedtronic Gas Turbine Control Systems, ensuring fast delivery and dependable support for your operational needs. Along with supplying high-quality unused and expertly rebuilt components, each backed by a solid warranty. We also offer comprehensive repair services to restore faulty boards to optimal performance. Our highly skilled technical team is available 24/7 to assist with OEM requirements, system diagnostics, and all types of automation challenges. With years of experience and a strong commitment to customer satisfaction, we ensure smooth, reliable, and efficient plant operations. For pricing, availability, or repair assistance, simply reach out to our team by phone or email, and we�ll provide prompt, professional support.

FREQUENTLY ASKED QUESTIONS:

What is IS200TREGS3B?

IS200TREGS3B is a Turbine Emergency Trip Terminal Board from General Electric used in the Mark VI platform. It powers three emergency trip solenoids and executes protective shutdown commands from the I/O controller. The board ensures rapid turbine trips during overspeed, fault, or emergency stop events. It is essential for safe turbine operation.

How many trip solenoids can IS200TREGS3B control?

The board supports three independent emergency trip solenoids. Each solenoid is controlled using a 3-relay voting logic for redundancy. This ensures a reliable shutdown even if a relay fails. The design provides high-integrity turbine protection.

What voltage levels does IS200TREGS3B support?

The standard HIB version operates with 125 V DC trip solenoids, while the H2B variant supports 24 V DC. Relay coils are powered by 28 V DC from the I/O controller. These voltage options allow the board to integrate into different turbine systems.

How does the relay voting logic work?

Nine trip relays are arranged in three groups of three, with each group controlling one solenoid. This 3-out-of-3 voting ensures that all relays in a group must agree to activate the solenoid. It increases reliability and prevents a single relay failure from blocking turbine trips.