SPECIFICATIONS
Part No.: IC9033B5E6
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Rated Voltage: 24 volts DC
Product Type: Power Resistor
Availability: In Stock
Series: Mark I and II
Functional Description
IC9033B5E6 is an Power Resistor developed by GE. It is part of the Mark I and II control system. It is designed to handle high currents and voltages under transient or steady-state conditions, ensuring reliable operation of contactors, relays, or motor loads connected to the Mark I/II PLC and I/O subsystems.
System Features
- The control system was developed with a primary design philosophy aimed at minimizing unplanned turbine shutdowns caused by control system failures. Recognizing the significant operational and financial impact of such interruptions, the system incorporates a high degree of redundancy to enhance running reliability. In most cases, if one part of the redundant system fails, the failure is annunciated while the turbine remains in operation under the control of the remaining functional components. This allows maintenance to be scheduled without immediate disruption. In areas where full hardware redundancy is not feasible, functional backup mechanisms are implemented. For instance, if the speed control loop fails, the temperature control system automatically assumes fuel regulation duties to maintain safe operation.
- At the core of the turbine control strategy is a speed governor, which directs the fuel control system to provide the appropriate fuel flow based on turbine speed requirements. The control system processes inputs through a minimum-value selection gate that considers signals from the speed control loop, temperature limiter, and startup fuel schedule. This ensures that the output command referred to as VCE (Variable Control Electronics) is always governed by the most restrictive input. By doing so, the system maintains conservative and safe fuel delivery under all operating conditions, protecting the turbine from overspeed or thermal damage.
- The broader goal of the design is to ensure continuous turbine operation, even in the face of certain control system malfunctions. This is achieved not just through hardware redundancy but also through intelligent control logic that enables fault detection, isolation, and failover to alternate control paths. As a result, the system supports operational continuity while providing timely alarms and diagnostics, allowing operators to take corrective action without triggering unnecessary shutdowns.
The WOC team is always available to help you with your Mark I and II requirements. For more information, please contact WOC.
Frequently Asked Questions
What is IC9033B5E6?
It is an Power Resistor developed by GE under the Mark I and II series.
How does the system achieve redundancy?
Redundancy is achieved through duplicate sensors, logic paths, and power supplies. In the event of a component failure, the redundant system continues operating, and the fault is annunciated without stopping the turbine.
What happens if the speed control loop fails?
If the speed control fails, the temperature control loop can assume control of the turbine’s fuel flow. This ensures the turbine continues to operate safely under thermal limitations.
