IS210TREGH4B - Turbine Emergency Trip Terminal Board

SPECIFICATIONS:

Part Number: IS210TREGH4B
Manufacturer: General Electric
Series: Mark VI
Product Type: Turbine Emergency Trip Terminal Board
Number of Channels: 24
Number of inputs: 12
Number of trip solenoids: 3
Number of outputs: 125 V dc
Technology: Surface Mount
Suppression: MOV across the solenoid
Trip interlock isolation: Optical isolation to 1500 V
Dimensions: 17.8 cm wide x 33.02 cm
Operating Temperature: 30 to 65�C
Repair: 3-7 Days
Availability: In Stock
Country of Origin: United States
Manual: GEH-6421I

FUNCTIONAL DESCRIPTION:

IS210TREGH4B is a Turbine Emergency Trip Terminal Board manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic Turbine Control Systems. TREGH4B 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. TREG provides the solenoids' positive side of the DC power, 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. H1B is the primary version for 125v DC 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. In Mark VI systems, the PPRO works with the TREG terminal board. Cables with molded plugs connect TREG to the PPRO module.

OPERATION:

The IS210TREGH4B Turbine Emergency Trip Terminal Board (TREG) is fully controlled by the GE Mark VI I/O controller, which manages all trip and status signals. Its primary connections to the control system are the J2 power cable and the trip solenoids, which execute turbine shutdown commands during emergency conditions. In simplex configurations, an additional cable from J1 to the TSVO terminal board carries a trip signal that engages the servo valve clamp, ensuring rapid and controlled turbine shutdown. This setup allows the TREG board to reliably coordinate emergency trips while maintaining separation between control and power circuits.

DIAGNOSTICS:

The I/O controller runs diagnostics on the TREG board and connected devices. The diagnostics cover the trip relay driver and contact feedback, solenoid voltage, economizer relay driver and contact feedback, K25A relay driver and coil, servo clamp relay driver and contact feedback, and the solenoid voltage source. If any of these do not agree with the desired value, then a fault is created. TREG connectors JX1, JY1, and JZ1 have their 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 plug location. When the chip is read by the I/O board, and a mismatch is encountered, a hardware incompatibility fault is created.

WOC maintains the largest inventory of OEM replacement parts for GE Speedtronic Control Systems, ensuring rapid availability for critical turbine operations. In addition to supplying unused and rebuilt boards, we offer expert repair services that meet strict OEM standards, backed by a comprehensive warranty for quality and reliability. Our team of skilled engineers is available 24/7 to provide technical support, troubleshoot issues, and assist with all your automation and control system requirements. For detailed information on pricing, availability, or repair services, please reach out to our specialists by phone or email.

FREQUENTLY ASKED QUESTIONS:

What is IS210TREGH4B?

It provides DC power to turbine trip solenoids and is fully controlled by the GE Mark VI I/O controller to execute emergency turbine trips. The board supports multiple solenoids, offers optical isolation for safety, and integrates diagnostics to ensure reliable operation in critical turbine control systems. It is widely used in GE Speedtronic turbine control applications for rapid and safe shutdown during abnormal conditions.

What voltage does the IS210TREGH4B operate on?

The primary operation is designed for 125 V DC applications. Control power is supplied through the JX1, JY1, and JZ1 connectors, providing redundancy and reliability. This DC voltage powers both the trip solenoids and the status feedback circuits. Optical isolation and MOV suppression protect the circuitry from voltage spikes.

What is the function of the optical isolation?

Optical isolation separates control circuitry from high-voltage trip relay circuits. It prevents electrical interference and ensures that voltage spikes do not affect the I/O controller. The board supports isolation up to 1500 V, maintaining safe and stable operation in industrial environments. This is critical for protecting sensitive turbine control electronics.

How does the board provide redundancy for trip circuits?

Redundant power is supplied via the combined JX1, JY1, and JZ1 connectors, which feed the status feedback and economizer relays. Relay groups are arranged in voting logic to ensure that multiple conditions must be satisfied before a trip is executed. This redundancy minimizes the risk of false trips and ensures continuous turbine protection.