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SPECIFICATIONS:
Part Number: IS200TSVOH2B
Manufacturer: General Electric
Series: Mark VIe
Product Type: Servo Valve Interface Terminal Board
Operating System: QNX
Power Requirements: +5 V dc, 6 A
Number of input channels: 6
Number of outputs: 2
Trip Solenoid Rating: 125 V dc
Power supply voltage: 24 V dc
Voltage Range: 18 - 32 VDC
Mounting: DIN-rail mounting
Technology: Surface mount
Operating temperature: 40 to 70°C
Size: 17.8 cm high x 33.02 cm
Repair: 3-7 Days
Availability: In Stock
Country of Origin: United States
Manual: GEH-6421M
FUNCTIONAL DESCRIPTION:
IS200TSVOH2B is a Servo Valve Interface Terminal Board manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The operation of the steam/fuel valves is managed by two electro-hydraulic servo valves linked to the Servo Input/Output (TSVO) terminal board. Linear Variable Differential Transformers (LVDTs) are employed to gauge the position of the valves. The J5 socket located on the front of the VSVO and the J3 or J4 connectors on the VME rack facilitate the connection of two wires to the VSVO. The JR1 connector is utilized by the TSVO for transmitting simplex signals, while the JR1, JS1, and JT1 connectors are used for distributing TMR signals. To implement an external trip from the protection module, plugs JD1 or JD2 should be used.
The IS200TSVOH2B uses different LVDT excitation transformers to increase the ability of the transformer to withstand dc offset without saturation. With some applications using the H1B, an excitation transient that introduces a momentary dc offset can result in a persistent waveshape distortion. This introduces approximately 35 mV rms reduction in the value of the excitation voltage. Applications with short-stroke valves magnify the effect of this phenomenon. In some applications, this has produced as much as a 5% change in the apparent value of position feedback, without any actual valve motion. When using these short-stroke valves, some applications that use multiple position feedback devices (LVDT or LVDR) to provide redundancy, monitor, and alarm the individual feedback values can experience valve position spread alarms. The TSVOH2B version was specifically created so that boards could be ordered and tracked with this special transformer.
INSTALLATION:
In the Servo Terminal Board Wiring diagram, connect the wires for the sensors and servo valves directly to two I/O terminal blocks on the terminal board. Each block has 24 connections and can accommodate wire gauges up to #12 AWG, with two screws securing each block in position. Adjacent to each terminal block is a shield termination strip that is grounded to the chassis. For external trip connections, use JD1 or JD2. The VSVO boards in racks R, S, and T should have their J5 connectors linked to the front. Additionally, connect the J1 connectors to the VME rack located beneath the VSVO in racks R, S, and T.
OPERATION:
The VSVO provides four channels for bi-directional servo current outputs, along with LVDT position feedback, LVDT excitation, and pulse rate flux inputs. It can accommodate excitation for up to six LVDT valve position inputs, which are processed by the TSVO. Each servo control loop can utilize one, two, three, or four LVDTs, with three inputs suitable for measuring gas turbine flow. These signals are routed through the TSVO to the J5 connection at the front of the VSVO board.
When not energized, each servo output features a specific suicide relay. This relay, managed by firmware, temporarily shorts the VSVO output signal to the signal common, returning to standard operation only after a manual reset. Diagnostics are in place to monitor the output condition of each servo, including voltage, current, and the status of the suicide relay.
CONFIGURATION:
Jumper JP1 is used to configure the coil current for Servo 1 in a simplex system, while jumper JP4 is designated for Servo 2. For additional information, refer to the Servo Coil Ratings table. In a TMR system, each servo output can have up to three coils. The coil current for Servo 1 is adjusted using Jumpers JP1 to JP3, whereas Jumpers JP4 to JP6 are responsible for setting the coil current for Servo 2. All other configuration tasks are carried out using the toolbox.
At World of Controls, we offer the largest stock of OEM replacement parts for GE Distributed Control Systems (DCS), including both unused and professionally rebuilt boards, all backed by a comprehensive warranty to ensure reliability and performance. Our team of experienced technicians can diagnose and repair faulty boards to OEM standards, providing solutions that minimize downtime and maintain system efficiency. Available 24/7, we support all your automation and control system needs, delivering expert guidance, rapid parts availability, and responsive technical assistance. For pricing, availability, or repair inquiries, contact our team via phone or email. We’re ready to help keep your operations running smoothly.
What is a Servo Valve Interface Terminal Board (SVITB)?
An SVITB is an electronic interface module that connects the turbine control system to the servo valve actuators, providing power, signal routing, and protection. It ensures precise control of hydraulic actuators by relaying commands from the control system while monitoring feedback signals for safe operation.
What is the primary function of a Servo Valve Interface Terminal Board?
A Servo Valve Interface Terminal Board acts as the electrical interface between the turbine control processor and the electro-hydraulic servo valves. It conditions, isolates, and distributes analog control signals to ensure precise actuator positioning.
What protection mechanisms are integrated into the board?
The board includes overcurrent limiting, short-circuit protection, and transient suppression circuits. These mechanisms protect both the servo valve coils and upstream control electronics. In trip conditions, drive signals are immediately removed to force the actuator to a safe state.
