Description
The GE IS200VPROH2B is a Mark VI Emergency Turbine Protection Board used as part of the independent turbine protection system. It works with TPRO and TREG boards to provide independent overspeed and emergency trip protection for GE gas and steam turbine control systems.
The IS200VPROH1BEF and IS200VPWRH1AHD are associated GE Mark VI board assemblies. Because the three part numbers can appear together in marketplace listings, they should not automatically be treated as one interchangeable board. The exact board function, revision, and system position should be verified from the nameplate and cabinet configuration before replacement.
🔧 Key Features
• GE Mark VI turbine control system components
• Independent emergency turbine protection architecture
• Triple-redundant VPRO protection configuration
• Overspeed and emergency trip monitoring
• Thermocouple input capability on VPRO
• Analog current input capability
• Interface with TREG trip relay hardware
• Designed for gas and steam turbine applications
• Industrial PCB construction
📋 Product Datasheet
• Brand: GE General Electric
• Primary Model: IS200VPROH2B
• Associated Models: IS200VPROH1BEF, IS200VPWRH1AHD
• Product Series: GE Mark VI / Speedtronic
• IS200VPROH2B Type: Emergency Turbine Protection Board
• Primary Function: Independent turbine overspeed and emergency protection
• Protection Architecture: Triple-redundant VPRO system
• Thermocouple Inputs: 9 channels
• Analog Current Inputs: 3 channels
• Trip Interface: TREG board / trip solenoid control
• Communication: Mark VI system backplane / I/O network, configuration dependent
• Power Supply: Mark VI system supply, configuration dependent
• Mounting: Mark VI control rack / cabinet
• Board Construction: Multi-board PCB assembly
• Operating Temperature: System dependent
• Dimensions: Mark VI rack-compatible board assembly
• Weight: Hardware-revision dependent
• Country of Origin: USA
• Application: Gas Turbine / Steam Turbine Protection
⚡ Functional Description
The IS200VPROH2B monitors critical turbine protection signals independently of the primary turbine control system. Its documented functions include nine thermocouple inputs for exhaust over-temperature protection, three analog current inputs, and backup synchronization-check protection.
Three VPRO boards can operate in a redundant protection architecture. The VPRO boards work with TREG hardware to control turbine trip solenoids, providing an independent protection path separate from normal turbine control functions.
🏭 Typical Applications
• Gas turbine emergency protection
• Steam turbine protection
• Turbine overspeed protection
• Exhaust temperature protection
• Generator synchronization protection
• Power plant safety systems
• GE Mark VI Speedtronic installations
🔌 Installation & Configuration
Basic replacement procedure:
• Verify the complete board identification and revision
• Confirm the Mark VI rack location
• Compare the existing board connectors and jumpers
• Back up the existing configuration where applicable
• Install the replacement board in the designated position
• Check all backplane and ribbon connections
• Restore system power
• Verify board diagnostics and protection status
For VPRO applications, protection logic should be functionally tested after installation. Particular attention should be given to overspeed, exhaust temperature, synchronization-check, and turbine trip circuits.
🛠️ Technical Notes
The IS200VPROH2B is the best-established identification among these three part numbers. Technical references consistently classify it as an Emergency Turbine Protection Board rather than a general-purpose communication or analog measurement module.
The IS200VPWRH1AHD is described inconsistently across online catalogs, with some sources calling it an analog measurement module and others assigning unrelated functions. Therefore, avoid using generic specifications from marketplace listings for critical replacement decisions.
📦 Ordering Information
GE IS200VPROH2B | IS200VPROH1BEF | IS200VPWRH1AHD
For procurement, confirm the exact GE part number, revision suffix, board assembly, and original Mark VI cabinet position. These details matter because similar-looking GE Mark VI boards are not necessarily electrically or functionally interchangeable.
