DS3800NPID1C - High Voltage Input Card

SPECIFICATIONS

Part Number: DS3800NPID1C
Manufacturer: General Electric
Series: Mark IV
Product type: High Voltage Input Card
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

DS3800NPID1C is a High Voltage Input Card designed and developed by GE. It is a part of Mark IV control system. This module is designed to handle and process input signals from sensors and field devices, providing data to the control processors for safe and efficient turbine operation.

Part of a Redundant and Robust Control Architecture

The Mark IV system is known for its fault-tolerant design and redundant architecture, ensuring high availability and operational safety. The core of the system consists of four main sections:

1. Control Sections – R, S, and T (RST):

• These three sections are identical yet completely independent control processors.
• Each section operates with its own dedicated input and output channels, as well as individual power supplies.
• They continuously monitor turbine conditions and make independent control decisions based on their respective sensor inputs.
• This independence allows the system to detect and isolate faults, minimizing the risk of a single-point failure affecting the entire turbine.

2. Communicator Section – C:

• The fourth section, referred to as the Communicator (C), acts as the central hub for inter-processor communication and operator interface.
• It communicates with the R, S, and T sections via six isolated communication lines, preventing a failure in one processor from affecting the others.
• The Communicator interfaces with operator controls such as membrane keypads and display screens, and it also connects to remote computers in remote control applications.

Sensor Distribution and Data Handling

To enhance reliability, critical sensors such as exhaust thermocouples are strategically distributed among the RST processors. For example:

• Thirteen exhaust thermocouples are distributed as follows:
  • 4 assigned to processor R
  • 5 assigned to processor S
  • 4 assigned to processor T

Each processor independently evaluates turbine temperature conditions and sends its readings to the Communicator section. The Communicator then:

• Calculates the median value of all inputs
• Sends the result back to RST for consistent and coordinated control

This median voting logic ensures that turbine control is based on a reliable central value, even if one or more thermocouples or processors encounter issues. In the event of a sensor or processor failure, each RST section can still make an independent judgment on how to adjust fuel flow and maintain safe turbine operation.

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 DS3800NPID1C?
It is a High Voltage Input Card designed and developed by GE.

What is unique about the Mark IV system architecture?
The Mark IV system is built on a quad-redundant architecture, consisting of three independent control processors (R, S, and T) and a fourth processor called the Communicator (C). This design allows for fault-tolerant operation and continued control even in the event of hardware failures.

What kind of signals can the card handle?
It is engineered to process high-voltage analog signals coming from critical turbine monitoring devices, such as thermocouples, pressure transmitters, or voltage sensors.