SPECIFICATIONS
Part Number: DS3800HDDA
Manufacturer: General Electric
Series: Mark IV
Product type: Display Driver
Availability: In Stock
Country of Manufacture: United States (USA)
Functional Description
DS3800HDDA is a display driver developed by GE. Designed to work seamlessly with Mark IV, this display driver board facilitates effective communication and control within the system. The display driver board, as part of the Mark IV control system, offers compatibility, efficient communication, and reliable display driver functionality. Its integration with the system's architecture and use of plugged cables enhance part management and maintenance processes. The utilization of relay ladder logic for sequential turbine control ensures a user-friendly and adaptable control scheme that meets the demands of various applications.
Product Features
- Compatibility with Mark IV Components: Specifically designed to be compatible with other Mark IV control system components. It integrates smoothly with the system's architecture, allowing for efficient communication and coordination between various control elements.
- Backplane Connectors and Plugged Cables: The majority of communication between the board and other system components occurs through backplane connectors and plugged cables, rather than screw-type connectors. This shift to plug cabling offers advantages such as improved part management and simplified maintenance. It allows for easier disconnection and reconnection of cables, reducing downtime and facilitating efficient troubleshooting and component replacement.
- Display Driver Functionality: The primary function is to drive and control the displays within the Mark IV control system. It provides the necessary circuitry and processing capabilities to present critical information and data in a clear and organized manner. The display driver board ensures that the information is accurately rendered on the connected displays, allowing operators to monitor and control the turbine system effectively.
- Relay Ladder Logic for Sequential Turbine Control: Utilizes relay ladder logic for sequential turbine control. This type of sequencing is widely recognized for its simplicity, making it easy to understand and learn. It is also flexible enough to accommodate changes or additions required by the end-user. The relay ladder logic ensures efficient and reliable control of the turbine system, providing operators with the necessary tools to manage its operation effectively.
System Features
- Three controllers R, S, and T have identical hardware and software and are used for all calculations required to keep the gas turbine running after it has reached complete sequence as well as all calculations required for a normal shutdown. Each computer is designed with circuitry to drive its outputs in a defined direction in the event of a power outage or a computer stall, but the two-thirds voting concept is the only reliable way of protecting against random component failures. A fourth computer, "The Communicator, C," monitors R, S, and T and sounds an audible alarm if any control parameter or logic signal in R, S, or T differs.
- The discrepancy is then displayed on the CRT so that maintenance personnel can assess the issue. Meanwhile, the turbine keeps running because the control is reacting to the median value. A field trip contact is connected to Contact Input Modules CIM1 and CIM2, where the signal is paralleled to three optical isolators and fed to separate digital input cards in R, S, and T. monitors the inputs seen by R, S, and T, performs a majority vote, and feeds the voted and individual values to the CRT for display. Field contacts that are not required to keep the turbine running are connected to Contact Input Modules 3 - 6 and optically isolated before being directly connected to C. Each computer is powered by an independent power supply that is fused separately from the 125VDC battery system.
- The relay driver card, HRDB, in the Relay Driver Module, RDM, performs logic output voting. The HRDB cards and relays are powered by two redundant 28VDC power supplies that are monitored by C. Trip circuit relays, such as fuel solenoids, have additional protection that disables power to the coil when a trip condition occurs. This prevents the relay driver from failing while the relay is turned on. Because of their predictable failure mode, interface flexibility (AC or DC), and form "C" contacts, magnetic relays are still used instead of solid-state relays.
WOC is happy to assist you with any of your GE requirements. Please contact us by phone or email for pricing and availability on any parts and repairs.
FREQUENTLY ASKED QUESTIONS
What is DS3800HDDA?
It is a display driver developed by GE
How are the relay driver cards and relays powered?
The relay driver card, HRDB, in the Relay Driver Module, RDM, performs logic output voting. The HRDB cards and relays are powered by two redundant 28VDC power supplies that are monitored by C.
How are trip circuit relays protected?
Trip circuit relays, such as fuel solenoids, have additional protection that disables power to the coil when a trip condition occurs. This prevents the relay driver from failing while the relay is turned on.
Why are magnetic relays used instead of solid-state relays?
Because of their predictable failure mode, interface flexibility (AC or DC), and form C contacts, magnetic relays are still used instead of solid-state relays.
