GE DS200TCPSG1AME Power Supply Board

The DS200TCPSG1AME is a Power Supply Board (TCPS) manufactured by GE Energy as part of the Mark V™ LM turbine control system. This board is a fundamental component that converts 125 V dc input power from the Power Distribution core (<PD>) into the multiple regulated and unregulated voltage levels required by the control system’s logic, analog, communication, and field circuits. The DS200TCPSG1AME is located in the R core (Control Engine) as well as in each of the four I/O cores (<R1>, <R2>, <R3>, and <R5>). It ensures stable and reliable power delivery to microprocessor boards, I/O boards, and other system modules.

The DS200TCPSG1AME is designed for continuous operation in harsh industrial environments, featuring a robust DC‑DC converter topology with high‑voltage isolation between input and outputs. The board includes built‑in fuse protection for each output rail and provides diagnostic signals to the control system for power supply monitoring. The suffix AME indicates a specific revision and factory configuration (including coating, component selection, and firmware alignment) that maintains full backward compatibility with all Mark V LM systems while incorporating the latest design enhancements.

This power supply board is critical for the proper operation of the Control Engine and all I/O engines. Without stable voltages from the DS200TCPSG1AME, the system cannot perform control, protection, or communication functions.

Functional Description

The DS200TCPSG1AME receives 125 V dc input power from the TCPD board in the <PD> core via connector J1. The input voltage range is 100 to 144 V dc, with ripple not exceeding 10 V peak‑to‑peak. Internally, the board uses a buck‑regulator to step down the input to an intermediate 50 V dc. This intermediate voltage is then fed to a push‑pull inverter that uses a transformer to provide galvanic isolation and generate multiple output voltages.

The following regulated outputs are produced:

• +5 V dc – for digital logic, microprocessors, and low‑voltage digital circuits.

• +15 V dc – for analog signal conditioning, operational amplifiers, and A/D converters.

• -15 V dc – for analog circuits requiring a negative supply.

• +24 V dc – for relay coils, solenoid drivers, and contact input excitation (non‑regulated but filtered).

Additionally, the board supplies the following unregulated but filtered outputs to external modules (via the EPBP backplane or direct cabling):

• ±24 V dc – for fans, de‑excitation module, crowbar, field voltage/current module.

• Isolated +70 V dc – for contact wetting on terminal boards such as EXTB and ECTB.

• Isolated 20 V ac – for IGBT gate drive and dynamic discharge board.

• ±55 V dc – for ground detector circuits on the EROC options card.

The regulated outputs are protected by fuses (FU1–FU4) and are monitored by the control system for over‑voltage, under‑voltage, or loss of power. The board includes test points (TP) that allow field verification of output voltages during troubleshooting. A green LED (typically labelled “P28 OK” or similar) indicates the presence of the 28 V dc output used for relay coils.

In the Mark V LM architecture, each I/O core has its own TCPS board, which powers the STCA, TCQA, TCQC, and other boards in that core. The TCPS board in the R core powers the UCIB motherboard, LBC586P CPU board, PANA ARCNET driver, and TCSA fuel skid interface board. In the R5 core, the TCPS also powers the TCCA and TCCB analog boards.

The DS200TCPSG1AME has no user‑configurable jumpers or software settings. It is designed for simple plug‑and‑play operation. Replacement must be performed with the core de‑energised.

Hardware Characteristics

Physical Form Factor and Mounting

The DS200TCPSG1AME is a printed wiring board conforming to the Mark V LM 6U Eurocard form factor (approximately 233 mm × 160 mm). It is inserted into the designated slot (typically location 5) in each core’s card cage. The board is secured by faceplate screws and includes ejector tabs for easy removal.

Connectors

Test Points

The DS200TCPSG1AME includes several test points for measuring output voltages. Typical test points (refer to Table 3‑2 in the Mark V LM manual) include:

• TP-P15 – +15 V dc output

• TP-N15 – -15 V dc output

• TP-+5V – +5 V dc output

• TP-DCOM – Digital common (ground reference)

• TP-+24V – +24 V dc output (unregulated)

• TP--24V – -24 V dc output (unregulated)

LED Indicators

The DS200TCPSG1AME has a green LED (often labelled “P28 OK” or “PWR”) that indicates the presence of the 28 V dc output used for relay coils and other field circuits. When the board is operating normally, this LED should be illuminated.

Fuses

The board has four fuses (FU1–FU4) that protect the output circuits. Their ratings and vendor catalog numbers are given in Appendix E of the Mark V LM manual. For the TCPS board:

Installation and Replacement

Handling Precautions

• Static sensitivity – The DS200TCPSG1AME contains static‑sensitive components. Always wear a wrist grounding strap and handle the board at a grounded workstation. Store the board in its antistatic bag when not in use.

• De‑energise before handling – Turn off power to the core (using the corresponding switch on the TCPD board in the <PD> core) and verify zero voltage before touching the board or any connected cables. Follow all local lock‑out/tag‑out procedures.

• Do not insert or remove with power applied – Doing so may cause equipment damage or personal injury.

Replacement Procedure

1. De‑energise the core where the DS200TCPSG1AME is installed.

2. Open the cabinet door and test for zero voltage on all circuits.

3. Label and disconnect all cables from the TCPS board (J1, 2PL, JP1/JP2, JC, and X1 if present).

4. Loosen the top and bottom captive screws and use the ejector tabs to unseat the board.

5. Remove the board from the card cage.

6. Before installing the replacement board, verify that all fuses (FU1–FU4) are intact and that the board has no physical damage.

7. Slide the replacement DS200TCPSG1AME into the correct slot (location 5 in the core) and press firmly to seat it.

8. Tighten the faceplate screws evenly.

9. Reconnect all cables in the reverse order.

10. Restore power to the core and verify that the green LED (if present) illuminates and that the control system reports no power supply diagnostic alarms.

Ordering Information

When ordering the DS200TCPSG1AME, use the complete part number exactly as shown. The part number follows GE’s convention:

• DS200 – Drive / Control series.

• TCPS – Functional acronym: Power Supply Board.

• G1 – Generation/version.

• A – Base designator.

• M – Modifier (e.g., coating, component variation, or special configuration).

• E – Revision E.

Warranty and Order Placement

• Warranty replacements (within warranty period): Contact GE Energy Post Sales Service.

• Spare parts or non‑warranty orders: Contact your nearest GE Sales or Service Office. Provide:

  • Complete part number: DS200TCPSG1AME

  • Turbine control system serial number

  • Material List (ML) number

Note: All digits and letters in the part number are significant. GE may substitute later compatible revisions, but backward compatibility is assured.

Diagnostics and Maintenance

The DS200TCPSG1AME does not require routine calibration. However, periodic checks of output voltages using the test points are recommended, especially after a power supply fault. The control system (via ToolboxST) provides diagnostic alarms for:

• Loss of 125 V dc input.

• Fuse failure on any output rail.

• Over‑voltage or under‑voltage condition on any regulated output.

• Overtemperature condition (if monitored by the TCPS board).

If any output voltage is outside its specified range, replace the board immediately. Fuses can be replaced in the field, but if a fuse blows repeatedly, the board should be replaced as there may be a short circuit in the load or a failure in the power supply itself.