DS3800HCMA1D1F Dual Communication Control Board

Supplied used, cleaned and tested with a one-year warranty, the DS3800HCMA1D1F is a GE Speedtronic Mark IV Dual Communication Control Board. It handles the movement of data between the boards and components of a Mark IV (DS3800) drive, keeping the control processors and the wider system in step. This unit belongs to the 1D group of the HCMA card, with an F revision on the end.

Where the 1D1F Sits in the Speedtronic Rack

The Mark IV is a triple modular redundant (TMR) control system. Three processors — <R>, <S> and <T> — independently evaluate the same inputs and vote two-out-of-three, while a <C> communications processor connects the control to the operator interface. Communication between elements of the panel was carried on RS-232 or RS-485 links. The HCMA sits in that communication path; boards of this type are generally fitted with configuration jumpers, indicator LEDs and a pair of 34-pin connectors, and they mount in a rack sandwiched between adjacent cards, which is why the jumpers must be configured before the board goes in.

Read the LEDs Before You Pull the Board

The HCMA's indicator LEDs are the fastest way to tell whether the card is actually the source of a communication problem. Do not condemn the board until you have worked through the following:

• Observe the indicators. Note the state of the amber and red status LEDs; they often reveal whether the fault is on the card or on the link it serves.
• Reseat and inspect. Pull and refit the two 34-pin connectors, checking for bent pins, corrosion or a damaged ribbon that would break communication intermittently.
• Look upstream and downstream. A board at the other end of the link, or a fault on the shared bus, can present exactly like a failed HCMA.
• Measure the supply. Confirm the DS3800 power rails are in tolerance; a weak supply can stall communication.
• Compare jumper settings. Make sure any replacement is jumpered identically to the board you removed, or it will not talk to the rest of the panel.

The 1D1F Group and Revision Explained

Break the part number into DS3800 (Mark IV family), HCMA (dual communication control function) and 1D1F (group and revision). The 1D group and F revision fix the exact build of this card; GE stepped these codes as the board was updated, so match the whole suffix to your installed unit rather than assuming any HCMA is interchangeable. The GE Speedtronic Part Number Decoder walks through how the groups and revisions are assigned.

Related Mark IV Cards on the Communication Bus

The HCMA shares the cabinet with other DS3800 communication and processing boards, such as the DS3800HCMB universal communication processor and the DS3800HMPF microprocessor board. You will find them in our GE Mark IV DS3800 Boards collection, and a wider selection in the GE Speedtronic Turbine Control Boards range. For a view of how later platforms are numbered, see Mark V vs Mark VI: DS200 to IS200.

Information That Speeds Your Quote

• Full part number and suffix (DS3800HCMA1D1F);
• Board revision and label photo where you can provide one;
• Turbine model and Mark IV confirmation;
• Quantity, urgency and, if available, the current jumper configuration.

Get Your Quote Back Within 24 Hours

This DS3800HCMA1D1F ships cleaned, tested and covered by a one-year warranty. Use Request a Quote and we will reply within 24 hours. Delivery is worldwide on DDP terms, and we accept purchase orders from qualified organizations; send your label photo and turbine details so we can match the right group and revision.