The GE IS200TREGH1BBC TREG Terminal Board is a critical turbine emergency trip terminal board used within GE Industrial Control Systems. As a member of the TREG board family, the IS200TREGH1BBC TREG Terminal Board provides power to three emergency trip solenoids and is controlled by the I/O controller, forming the final output stage of the emergency overspeed and trip protection system. Up to three trip solenoids can be connected between the TREG and TRPG terminal boards, with the TREG providing the positive side of the DC power to the solenoids and the TRPG providing the negative side, so that either board can remove power and actuate the hydraulics to close the steam or fuel valves.
The IS200TREGH1BBC TREG Terminal Board is identified by the GE part numbering convention used throughout the Industrial Control Systems product line. The "IS200" prefix identifies the board as a GE Industrial Control Systems product, with "200" specifically indicating that the board is a base-level assembly. The "TREG" acronym identifies the board's functional designation as a Turbine Emergency Trip terminal board. The "H1" designation identifies the hardware group and the 125 V DC application variant, while the "BBC" suffix identifies the artwork and functional revision combination. All digits are important when ordering or replacing any board, as boards of different revision levels may not contain identical hardware, and GE ensures backward compatibility of replacement boards while noting that different revision levels may not contain identical components.
The IS200TREGH1BBC TREG Terminal Board belongs to the H1B version of the TREG family, which is the primary version for 125 V DC applications. In the H1B version, control power from the JX1, JY1, and JZ1 connectors is diode-combined to create redundant power on the board for status feedback circuits and powering the economizing relays, while power separation is maintained for the trip relay circuits. The TREG family also includes the H2B version for 24 V DC applications, and the H3B, H4B, and H5B versions that are special versions of the H1B for use in systems with redundant TREG boards, where feedback circuit and economizing relay power is provided only by the JX1, JY1, or JZ1 connector respectively. In redundant TREG applications, it is typical to find one H3B and one H4B board used together, and it is important that system repairs be done with the correct board type to maintain the control power separation designed into these systems.
This product introduction provides detailed technical information, functional descriptions, connector assignments, configuration guidance, and comprehensive specifications for the GE IS200TREGH1BBC TREG Terminal Board, serving as an essential reference for control system engineers, maintenance technicians, and system integrators working with GE industrial control equipment.
Functional Architecture and Signal Processing
The IS200TREGH1BBC TREG Terminal Board is built around a robust trip output architecture that provides the final power switching function for the emergency trip solenoids, ensuring that the turbine can be reliably tripped under all conditions. The board performs several distinct functions that ensure reliable and safe operation of the emergency trip system.
The I/O controller provides emergency overspeed protection, emergency stop functions, and controls the 12 relays on the TREG, nine of which form three groups of three to vote inputs controlling the three trip solenoids. The nine trip relay coils on the TREG are supplied with 28 V DC from the I/O controller, and the trip solenoids are supplied with 125 V DC through plug J2, drawing up to 1 A with a 0.1 second L/R time constant. The solenoid circuit includes a metal oxide varistor for current suppression and a 10 ohm, 70 W economizing resistor, protecting the circuit from inductive voltage spikes and reducing the current load after the solenoids are energized.
A separately fused 125 V DC feeder is provided from the turbine control for the solenoids, which energize in the run mode and de-energize in the trip mode. Diagnostics monitor each 125 V DC feeder from the power distribution module at its point of entry on the terminal board to verify the fuse integrity and the cable connection, ensuring that the trip circuit is intact and ready to operate.
Two series contacts from each emergency trip relay (ETR1, ETR2, ETR3) are connected to the positive 125 V DC feeder for each solenoid, and two series contacts from each primary trip relay (PTR1, PTR2, PTR3 in TRPG) are connected to the negative 125 V DC feeder for each solenoid. This arrangement ensures that both the TREG and the TRPG must agree to energize or de-energize the solenoid, providing the redundancy and diversity required for the emergency trip function.
An economizing relay (KE1, KE2, KE3) 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, allowing the solenoids to be held in the energized state with lower power dissipation. The ETR and KE relay coils are powered from a 28 V DC source from the I/O controller, with each I/O controller in each of the R8, S8, and T8 sections supplying an independent 28 V DC source, providing the redundancy required for the trip function.
Trip Solenoid Control and Redundancy
The IS200TREGH1BBC TREG Terminal Board controls the trip solenoids in conjunction with the TRPG terminal board, with both boards controlling the solenoids so that either one can remove power and actuate the hydraulics to close the steam or fuel valves. This arrangement ensures that a failure in one board does not prevent the turbine from being tripped, providing the high availability required for the emergency trip function.
The 28 V DC bus is current limited and used for power to an external manual emergency trip contact, shown as E-STOP. Three master trip relays (K4X, K4Y, K4Z) disconnect the 28 V DC bus from the ETR and KE relay coils if a manual emergency trip occurs. Any trip that originates in either the protection module (such as EOS) or the TREG (such as a manual trip) will cause each of the three protection module sections to transmit a trip command over the IONet to the control module, and may be used to identify the source of the trip.
In addition, the K4CL servo clamp relay will energize and send a contact feedback directly from the TREG terminal board to the TSVO servo terminal board. The TSVO disconnects the servo current source from the terminal block and applies a bias to drive the control valve closed. This is only used on simplex applications to protect against the servo amplifier failing high. It is important to note that the primary and emergency overspeed systems will trip the hydraulic trip solenoids independent of this circuit, providing a final layer of protection that does not depend on the servo clamp function.
Solenoid Trip Tests
The IS200TREGH1BBC TREG Terminal Board supports comprehensive solenoid trip tests that allow the trip solenoids to be verified without tripping the turbine. Application software in the controller is used to initiate tests of the trip solenoids, and online tests allow each of the trip solenoids to be manually tripped one at a time, either through the PTR relays from the controller, or through the ETR relays from the protection module. A contact from each solenoid circuit is wired back as a contact input to give a positive indication that the solenoid has tripped, allowing the test to be verified without ambiguity.
Primary and emergency overspeed tests are provided too for verification of actual trips due to software simulated trip overspeed conditions, allowing the complete trip path to be verified during commissioning and periodic testing without the need to actually overspeed the turbine.
Installation and Wiring
The IS200TREGH1BBC TREG Terminal Board is designed for straightforward installation and field wiring. The three trip solenoids, economizing resistors, and the emergency stop are wired directly to the first I/O terminal block, while up to seven trip interlocks can be wired to the second terminal block. The terminal blocks can be unplugged from the terminal board for maintenance, and up to two #12 AWG wires per point with 300 volt insulation can be accommodated, providing flexibility for different field wiring requirements.
The wiring connections include the PWR_N1, PWR_N2, and PWR_N3 power connections, the RES_1B, RES_2B, and RES_3B resistor connections, the SOL_1 or 4, SOL_2 or 5, and SOL_3 or 6 solenoid connections, the E-TRP (H) and E-TRP (L) emergency trip connections, the contact TRP1 through TRP7 trip interlock connections, and the PWR_P1 and PWR_P2 test probe connections. The board also includes the J1 connector to the TSVO termination boards on SMX systems, the J2 connector to the TRPG board, and the JX1, JY1, and JZ1 connectors to the VPRO protection module, providing the comprehensive interface required for the trip system.
The board size is 17.8 cm wide by 33.02 cm high (7.0 in x 13.0 in), and the shield bar provides a termination point for the cable shields, ensuring proper shielding and grounding of the field wiring.
Diagnostics and Fault Detection
The IS200TREGH1BBC TREG Terminal Board provides comprehensive diagnostic capabilities that assist with system verification and fault isolation. The I/O controller runs diagnostics on the TREG board and connected devices, covering the trip relay driver and contact feedbacks, solenoid voltage, economizer relay driver and contact feedbacks, the K25A relay driver and coil, the servo clamp relay driver and contact feedback, and the solenoid voltage source. If any of these do not agree with the desired value, a fault is created, alerting the operator to a potential problem with the trip circuit.
The TREG connectors JX1, JY1, and JZ1 have their own ID device that is interrogated by the I/O controller. The ID device is a read-only chip coded with the terminal board serial number, board type, revision number, and the plug location. When the chip is read by the I/O board and a mismatch is encountered, a hardware incompatibility fault is created, preventing the system from operating with incorrect or mismatched hardware. This diagnostic feature ensures that the correct board is installed in each location and that the system configuration matches the physical hardware.
Configuration
The IS200TREGH1BBC TREG Terminal Board has no switches on the terminal board. Configuration is performed through the system software and the I/O controller, simplifying installation and reducing the potential for configuration errors. A jumper must be placed across terminals 15 and 17 if the second emergency stop input is not required, ensuring that the trip circuit operates correctly in systems that use only a single emergency stop input.
Application Suitability and System Integration
The IS200TREGH1BBC TREG Terminal Board is a critical component of the gas turbine emergency trip system, providing the final power switching function for the emergency trip solenoids. In Mark VI systems, the VPRO works with the TREG terminal board, with cables with molded plugs connecting the TREG to the VPRO module. In Mark VIe systems, the TREG is controlled by the PPRO pack on the SPRO, with the PPRO I/O packs plugging into the D-type connectors on the SPRO and cables with molded plugs connecting the TREG to the SPRO board.
The board's role in the trip system is to provide the positive side of the DC power to the trip solenoids, with the TRPG providing the negative side, so that either board can remove power and actuate the hydraulics to close the steam or fuel valves. The board's nine trip relay coils, supplied with 28 V DC from the I/O controller, control the three groups of three relays that vote on the trip solenoid commands, providing the redundancy and reliability required for the emergency trip function.
The board's support for redundant TREG applications, with the H3B, H4B, and H5B versions, allows the control power separation to be maintained in systems with redundant TREG boards. In these applications, it is typical to find one H3B and one H4B board used together, and it is important that system repairs be done with the correct board type to maintain the control power separation designed into these systems.
The board's diagnostic capabilities, including the trip relay driver and contact feedback diagnostics, the solenoid voltage diagnostics, the economizer relay diagnostics, and the onboard ID chip, simplify troubleshooting and ensure that the correct board is installed in each location. The solenoid trip tests allow the trip solenoids to be verified without tripping the turbine, and the primary and emergency overspeed tests allow the complete trip path to be verified during commissioning and periodic testing.
Maintenance and Lifecycle
The IS200TREGH1BBC TREG Terminal Board is designed for long service life with minimal maintenance. The board contains no moving parts other than the relays, and its robust construction ensures high reliability in continuous industrial operation. Routine maintenance consists of periodic visual inspection of the board, terminal blocks, and wiring, verification that the solenoid voltage is present and within specification, and confirmation that the shield terminals are properly connected.
The board's diagnostic features, including the trip relay driver and contact feedback diagnostics, the solenoid voltage diagnostics, the economizer relay diagnostics, and the onboard ID chip, simplify troubleshooting and ensure that the correct board is installed in each location. If any diagnostic value does not agree with the desired value, a fault is created, alerting the operator to a potential problem with the trip circuit.
If the board requires replacement, the process is straightforward. After de-energizing the associated equipment and verifying that no power exists, the pluggable terminal blocks should be labeled and removed, and the board should be removed from its mounting. The replacement board should be of the correct board type to maintain the control power separation designed into the system, and the terminal blocks should be reconnected as labeled before returning the system to service.
GE Industrial Control Systems ensures compatibility of its replacement boards, even though boards of different revision levels may not contain identical hardware. When ordering a replacement IS200TREGH1BBC TREG Terminal Board, provide the complete part number and description, the drive or system serial number, and the Material List (ML) number. The factory may substitute later versions based on availability and design enhancements, but backward compatibility of replacement boards is guaranteed.
Conclusion
The GE IS200TREGH1BBC TREG Terminal Board is a reliable, robust, and safety-critical component of GE Industrial Control Systems emergency trip systems. Its three trip solenoids per board, its voting architecture with nine trip relay coils forming three groups of three, its economizing relays and MOV suppression, its support for redundant TREG applications, and its comprehensive diagnostics and solenoid trip tests provide the reliability, redundancy, and testability required for the emergency trip function.
With its pluggable terminal blocks, clearly labeled connectors, comprehensive diagnostics, and compatibility with both Mark VI and Mark VIe architectures, the IS200TREGH1BBC TREG Terminal Board is designed for easy installation, verification, and maintenance. Backed by GE's quality manufacturing, global support network, and commitment to backward compatibility, the IS200TREGH1BBC TREG Terminal Board continues to deliver the performance, durability, and safety that industrial users expect from GE. Whether used in a new installation or as a replacement for an existing board, the IS200TREGH1BBC TREG Terminal Board provides the emergency trip functionality required for reliable and safe turbine control system operation.
