GE V7768-320000 Terminal board components for steam turbine control system
1. Product Description
The GE V7768-320000 is a Terminal Board Assembly designed for GE Speedtronic™ Mark IV gas/steam turbine control systems. It functions as a passive interface for signal routing, termination, and interconnection between I/O modules, sensors, and the Mark IV controller.
2. Product Parameters & Specifications
Key Specifications Table
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Category
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Specification
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Part Number
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V7768-320000
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Series
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Speedtronic™ Mark IV Turbine Control System
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Type
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Terminal Board / Signal Interface Assembly
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Material
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Fire-retardant fiberglass laminate (FR-4)
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Connectors
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Screw terminals, spring-clamp connectors
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Voltage Rating
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300V AC/DC
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Current Rating
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5A per terminal (max)
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Isolation
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1500V AC (terminal-to-backplane)
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Compatibility
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Mark IV I/O Cards (e.g., VDANG, VCCC, VCCC)
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Temperature Range
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-25°C to +85°C (-13°F to +185°F)
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Certifications
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UL 94V-0, IEC 60664
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Obsolete Status
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Legacy (No longer manufactured; limited spares available)
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3. Series & Variants
- Series: Part of GE’s Mark IV Terminal Board Series (V77xx prefix).
- Variant Notes:
- -320000 suffix indicates assembly configuration (pre-wired for specific racks).
- Compatible with Mark IV Racks (e.g., TMR Racks, VME Racks).
4. Key Features
- Signal Termination: Provides secure screw terminals for field wiring (analog/digital I/O).
- Backplane Interface: Direct plug-in to Mark IV backplanes via card-edge connectors.
- Modular Design: Supports daisy-chaining for expandable I/O points.
- Labeling System: Pre-printed terminal labels for simplified wiring.
- EMI Protection: Shielding and isolation for noise-sensitive signals.
5. Function & Role
- Routes sensor/actuator signals (RTDs, T/Cs, 4–20mA, dry contacts) to Mark IV I/O cards.
- Terminates field wiring to prevent signal reflection/interference.
- Consolidates wiring between controllers, power supplies, and field devices.
- Provides test points for diagnostics.
6. Applications & Use Cases
Primary Application Domain
Power Generation Turbine Control:
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Application
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Function
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|---|---|
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Sensor Integration
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Terminates thermocouples (T/Cs), RTDs, pressure transmitters.
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Actuator Control
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Routes signals to valve positioners, solenoids, and relays.
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System Expansion
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Extends I/O capacity for auxiliary systems (lube oil, cooling water).
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Maintenance Access
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Provides test points for troubleshooting without disrupting wiring.
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Secondary Industrial Uses
- Compressor control systems
- Hydroelectric plant monitoring
- Industrial boiler control
7. Important Notes
- Legacy Status: Part of discontinued Mark IV systems; replacements require retrofits to Mark VIe.
- Compatibility: Verify rack/card revisions (e.g., works with IS200/DS200 cards only in hybrid retrofits).
- Modern Alternatives: GE’s Mark VIe uses integrated IS220/IS230 terminal blocks (e.g., IS220TBAIH1C).
Summary
The GE V7768-320000 is a critical signal-termination assembly in legacy Mark IV turbine control systems. Its robust terminal design and simplified wiring structure ensure reliable signal integrity in harsh power generation environments. For active installations, GE recommends migrating to Mark VIe systems with modern terminal solutions.
⚠️ Disclaimer: Specifications based on legacy documentation. For technical support, contact GE’s Power Conversion Legacy Support or refer to GEH-6196 (Mark IV Systems Manual).
Comparison to Newer Systems
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Aspect
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V7768-320000 (Mark IV)
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Modern Equivalent (Mark VIe)
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|---|---|---|
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Function
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Passive termination
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Active I/O with diagnostics (e.g., IS220TBAIH1C)
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Configuration
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Hardware-only
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Software-configurable via ToolboxST™
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Comms
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None (wiring only)
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Ethernet/IP, PROFIBUS
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Lifecycle Status
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Obsolete
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Active production
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