GE IS200TTURH1CFD Mark VIe Turbine Terminal Board

The GE IS200TTURH1CFD, also cataloged as the IS200TTURH1CFD (TTUR) Primary Turbine Protection Input Terminal Board, operates as a dedicated hardware component for speed sensing, voltage monitoring, and emergency overspeed trip signal routing within Mark VIe turbine control systems. The conformal-coated terminal board conditions magnetic pulse signals from speed pickups and high-voltage potential transformer inputs, passing digitized frequency and voltage matrices directly to connected PTUR or TTUR I/O packs for emergency valve actuation.

Suffix Breakdown & Model Matrix

Hardware Specifications

Backplane Bus Communication & I/O Density Scaling

The IS200TTURH1CFD interfaces directly with Mark VIe turbine control packs via multi-pin D-sub connectors mounted on the PCB. Analog pulse-rate frequency signals and PT voltage inputs received on the terminal blocks travel through local signal conditioning circuits before reaching the high-speed I/O pack bus. Internal circuit paths route critical overspeed trip commands directly to emergency trip terminal cards without signal delay, maintaining high backplane communication speeds and allowing TMR (Triple Modular Redundant) voting configurations across parallel I/O packs.

Frequently Asked Questions

Q: What specific field signals are connected to the two 24-point terminal blocks?

A: The two pluggable 24-point terminal blocks accept field connections for turbine pulse-rate speed pickups (magnetic sensors on toothed wheels), generator and bus potential transformer (PT) voltage feedback lines, and discrete overspeed trip outputs linked to the turbine trip block.

Q: How does the conformal coating on the PCB benefit field installation?

A: The conformal coating protects the circuit board traces, solder joints, and components against airborne contaminants, moisture, and mild corrosive gases common in industrial power generation turbine environments.

Field Installation Guidelines

• Secure the TTUR board to the panel backplate using all factory-drilled mounting holes to ensure structural stability and reliable chassis grounding.
• Tighten the two securing screws on each pluggable terminal block to maintain a solid mechanical lock against field vibration.
• Route sensor lead wires for TTL and passive magnetic speed pickups using twisted, shielded cable pairs; terminate shield drain wires directly to the grounded metal shield bar running along the left side of the board.
• Verify potential transformer (PT) voltage signal levels fall within standard control limits before connecting field lines to the terminal terminals.