DS200TCQAF1AFC - Software EPROM Set

SPECIFICATIONS

Part No.: DS200TCQAF1AFC
Manufacturer: General Electric
Series: Mark V
Product type: Software EPROM Set
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

DS200TCQAF1AFC is a Software EPROM Set developed by GE. It is a part of Mark V control system. EPROM is a memory that retains data even when the power supply is disconnected. It is built using floating-gate transistors that store charge representing binary data. The memory is programmed by applying high-voltage electrical pulses to the gate of each transistor, which traps electrons in the gate and changes its state to store data. EPROMs can be erased and reprogrammed by exposing them to ultraviolet (UV) light, which removes the trapped charge, effectively resetting the stored data. This process makes it reusable for multiple iterations of programming and erasure.

Software Voting

• Software voting and hardware voting are crucial components of the Mark V control system, designed to enhance the reliability and fault tolerance of the system by preventing erroneous trips or failures due to sensor or input malfunctions. This system employs both Software Implemented Fault Tolerant (SIFT) techniques and hardware voting mechanisms to ensure robust and error-free operation.
• At the start of each computing cycle, each of the three controllers independently reads data from its connected sensors and shares this data with the other controllers. This data exchange allows each controller to calculate the median values of all analog inputs, which are then used as the control parameters for that controller. This approach ensures that any irregular readings from one controller’s sensors are minimized and averaged out, effectively eliminating any impact from a malfunctioning sensor or erroneous data.
• The diagnostic algorithm continually monitors the analog inputs against a predefined deadband, which is a permissible range for normal sensor behavior. If any analog input strays outside this deadband, an alarm is triggered, alerting the maintenance personnel of a potential issue. This allows for quick identification and rectification of faults before they can compromise the system’s operation. Importantly, this SIFT method ensures that there is no single point of failure in the system, providing continuous and safe operation.
• Contact inputs, which include critical functions such as low lubrication oil pressure, are also managed through a voting system to maintain reliability. Each contact input is connected to a single terminal point and wired in parallel to three contact input boards.
• Each board optically isolates the 125 or 24V DC input, ensuring that the signals remain independent from any electrical noise or fluctuations. The dedicated 80196 processors on each board timestamp the input signals with millisecond resolution, ensuring accurate time-stamped data for processing. These signals are then transmitted to the controllers, where they undergo voting to determine the correct response based on the majority of inputs. Redundant contact inputs, such as those for critical safety functions, are connected to separate terminals and voted on individually.
• This system ensures that even if one input board or sensor fails, the remaining inputs can still be trusted to provide accurate control signals, preventing false alarms or trips. The SIFT technique, when applied to both analog and contact inputs, allows the control system to withstand multiple failures from different circuits without triggering erroneous trip commands, ensuring that the system remains operational and secure in the event of sensor faults.

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Frequently Asked Questions

What is DS200TCQAF1AFC?
It is a Software EPROM Set developed by GE. 

How does the modular design of the Mark V system benefit maintenance?
The modular design allows for easy maintenance and replacement of individual components. Each controller consists of up to five boards, including a power supply. The use of ribbon cables and gas-tight connectors helps ensure robust connections, and the modularity makes it easier to troubleshoot, repair, or replace malfunctioning parts without significant system downtime.

What types of turbine sensors are compatible with the Mark V system?
The Mark V TMR system is designed to work with a wide range of sensors, including triple-redundant sensors for critical functions like temperature, pressure, and vibration. Non-critical functions can be handled with dual or single sensors. The system can be configured to accept various types of sensors based on the turbine's specific requirements.

What happens if a controller in the TMR system fails?
In the event of a failure in one of the controllers (R, S, or T), the other two controllers continue to operate and perform the necessary turbine control functions. This redundancy ensures that the turbine remains operational and safe even in the event of controller failure.