GE IS200VPROH2B VPRO Turbine Independent Overspeed Protection Board

GE IS200VPROH2B VPRO Turbine Independent Overspeed Protection Board

I. Basic Information
Brand Ownership: GE Vernova (formerly GE Power) Speedtronic Mark VI Generator / Steam Turbine Control System
Full Model Name: IS200VPROH2B, commonly known as VPRO Independent Protection Board
Product Positioning: Triple-redundant emergency trip overspeed protection card independent of the main control system, the highest level safety hardware for the unit, not dependent on the main control CPU, can still perform shutdown protection in case of main control failure
Life Cycle: The original factory has discontinued production (End of Life), only new inventory, disassembled test spare parts are circulated; Upgrade model is Mark VIe with no similar hardware architecture, can only replace and repair with the same model
Matching Terminal Board: TPRO (Signal Terminal) + TREG (Trip Electromagnetic Valve Drive Terminal), the three form a complete overspeed protection circuit

Core Hardware Functions (Triple Redundancy 2oo3 Voting)
The entire protection unit is equipped with 3 IS200VPROH2B, three-out-of-two hardware voting, eliminating single-point failure:
Overspeed Protection (Core)
Collect MPU magnetic resistance speed probe pulses (2Hz~20kHz), independent hardware overspeed threshold judgment, over-limit directly drives the trip electromagnetic valve to stop the machine, unaffected by main control software failure
Exhaust Overheating Protection
Integrate 9 channels of thermocouple TC input, independently monitor the exhaust temperature of the generator, over-temperature triggers emergency trip
Analog Input Monitoring
3 channels of 4–20mA current analog input, used for generator voltage, backup protection for synchronous grid connection
Hardware Trip Output
Board-mounted multi-channel relay drive circuit, directly controls the generator cut-off oil electromagnetic valve, main steam valve / fuel cut-off valve
Board-mounted Diagnosis
Panel status LED, channel open circuit detection, card self-check, three-channel consistency verification, fault uploads to Mark VI HMI alarm

Electrical and Mechanical Specifications
Bus Architecture: Mark VI VME Backplane Bus
Power Supply: Backplane DC 5V, ±12V system power supply
Operating Temperature: 0℃ ~ +60℃, cabinet air-cooled; wide temperature model supports – 40~+85℃
Size: 262 × 188 × 21 mm, single card weighs approximately 0.3kg
Interfaces: VME Backplane Connector, front panel D-Sub Signal Cable, thermocouple terminal block
Isolation: Optical isolation of speed, temperature channels from power loop, resistant to large power electromagnetic interference of power plants

System Architecture Logic
Mark VI consists of two completely isolated hardware units: Main Control Unit VCMI + Independent Protection Unit VPRO
VPRO does not rely on the main control operation, all protection logic is hardware-固化， meeting the SIL2/SIL3 safety requirements of power plants
Triple Redundancy 3 VPRO simultaneously collect speed / temperature signals， 2 channels or more faults determine the fault and execute cut-off， single card damage does not trigger false trip
The TREG terminal board outputs strong current to drive the trip coil， TPRO connects the on-site MPU， thermocouple sensors

Typical Application Scenarios
Combined Cycle GE 9FA/6FA Generator， Steam Turbine Power Generation Unit Mark VI Control System
Gas Turbine Drive Compressor Overspeed Protection for Oil Refining and Chemical Plants
Old Mark VI Units in Power Plants for Spare Parts Maintenance and Replacement

 Compatible / Alternative Models of the Same Series Table
Model Explanation of Differences
IS200VPROH2B Standard model, universal Mark VI protection module (current model)
IS215VPROH2B VPRO assembly kit, including backplane connectors, with exactly the same functions
IS200VPROH1BEF Later hardware version, with different channel quantity and terminal definitions, cannot be directly interchanged