DS3820MSAB

About the DS3820MSAB

The DS3820MSAB is PCB component from GE for the Mark IV series.  The Mark IV, which is designed for gas/steam turbine management, has integrated microcomputers that simultaneously monitor the turbine system for issues and necessary changes to control parameters.  Using a two-out-of-three voting system gives the Mark IV significantly more reliability as compared to earlier Speedtronic systems, and lowers the turbine outage rate.

The DS3820MSAB is a modification built upon a DS3800NASB board.   The DS3820MSAB includes the installation of DIN rails to the original PCB, as well as the addition of a plexiglass cover.  The DIN rail system is connected via screws connected to the corners of the board. The plexiglass cover is connected to the board via five screw mounts which fit into vertical spacer pins.  It is important to note this cover has cutouts to leave the two transformers placed on the board uncovered.

The original PCB is built with the following specifications:

• It has fourteen test points.  Test points are not placed on the board in numerical order.

• It has male connectors placed on three edges of the board.  This includes four right-angled PCB connectors and three two-pin headers.  The headers are used to mate the wiring of the DIN rails to the original board.

• It has three transistors.  This includes one Motorola NPN 2-pin transistor fitted with a heat sink, and two smaller transistors.

• It has seven Cera-mite thermistors.  Thermistors are designed to lose resistance as they heat.  

• It has two trim potentiometers.

• It has seven integrated circuits.

• It has two transformers.

All technical support for the DS3820MSAB was the responsibility of GE.  This includes publications like manuals and datasheets.