General Electric DS3800HMPJ1A1D Mark IV Microprocessor Board

Description

The General Electric DS3800HMPJ1A1D is a microprocessor printed circuit board designated under the functional acronym HMPJ and classified as a Group 1 assembly within the Mark IV Speedtronic turbine control system series. The board is engineered for execution within triple modular redundant (TMR) turbine control architectures, which feature duplicated processors voting on inputs to maximize operational uptime and control integrity for industrial gas and steam turbines.

The physical construction features a base circuit board without a standard metal installation faceplate, instead using two retention clips mounted on the right-hand edge to secure the module within a standard Mark IV VME rack installation assembly. Interfacing is facilitated via a backplane connector on one short edge and a cable connector on the opposite short edge. A vertical pin connector positioned near four surface-mounted standoffs enables connection to a secondary daughterboard. The board integrates over fifty integrated circuits, including multiple PROMs/EPROMs, two diagnostic LEDs, resistor network arrays, diodes, capacitors, test points, and configurable jumper switches. Factory-drilled mounting holes surrounded by insulating rings prevent surface voltage transference and electrostatic discharge.

Features

• TMR Architecture Integration: Operates within triple modular redundant control schemes with voter logic to eliminate single points of failure.
• Dual Connector Configuration: Designed with a backplane edge connector and a secondary cable connector for system and module-level communication.
• Daughterboard Support: Features a vertical pin connector alongside four surface standoffs to support modular expansion via an add-on daughterboard.
• VME Rack Retention: Utilizes two dedicated retention clips on the right side for direct installation into standard VME rack frames.
• Insulated Mounting Protection: Incorporates factory-drilled mounting holes ringed with insulating material to safeguard against electrostatic discharge and stray surface voltages.
• On-Board Diagnostics and Configuration: Equipped with two status LEDs (one yellow, one red), accessible test points, and configurable hardware jumper switches.

Applications

• Primary computing and logic execution in General Electric Mark IV Speedtronic turbine control systems.
• Management and control processing for industrial gas turbine installations.
• Control architecture processing for industrial steam turbines.

Technical Specifications

Installation Guidelines

• Match all configurable jumper switch positions on the replacement board directly to the settings of the existing board prior to installation.
• Utilize the two right-hand retention clips to securely seat and lock the PCB inside the Mark IV standard VME rack frame.
• Ensure proper alignment of the backplane connector and cable connector on the opposing short edges during board insertion.
• When installing a secondary daughterboard, align the board over the four surface standoffs and mate it firmly with the vertical pin connector.
• Verify that hardware mounting screws engage through the insulated ringed holes to maintain electrical isolation from surface voltages.