DS200TCRAG1ABB - Relay Output Board

SPECIFICATIONS:

Part Number: DS200TCRAG1ABB
Manufacturer: General Electric
Series: Mark V LM
Product Type: Relay Output Board
Location: Core
Power Handling: 335 V DC
Relay Switching Time: <10 ms
Input Voltage: 24V DC
Operating Temperature: 0°C to 60°C
Repair: 3-7 Days
Availability: In Stock
Country of Origin: United States
Manual: GEH-6421I

FUNCTIONAL DESCRIPTION:

DS200TCRAG1ABB is a Relay Output Board manufactured and designed by General Electric as part of the Mark V LM Series used in GE Speedtronic Gas Turbine Control Systems. The Relay Output Board (TCRA), located in the digital cores, contains up to 30 relays, K1 through K30. There are two of these boards in each digital IO core. The TCRA board in location four of the core contains only four relays, which are connected to the TCQE via the JO connector. These relays are used to operate the gas manifold blow-off valves in some applications. All other TCRAs contain a full complement of 30 relays. The first 18 relays on TCRA in location four of can be configured to provide a power source to operate solenoids. The first 16 of these relays on the TCRA board in location five of both the and core can be configured this way also. This is done using hardware jumpers on the DTBC and DTBD terminal boards. Two additional contact outputs (#47 and #48) can be wetted on the TCRA board in location five of either or using the power connectors J19 and J20. Connectors J19 and J20 bring 120/240 V ac power from the core to the DTBD board in one of the cores. These signals are typically used for ignition transformers. The signals to open or close the relays are written to the TCRA boards by the TCDA boards in the digital cores. The signals for the TCRA board in location four of are from the TCQE board in the core. The first 18 solenoid outputs in cannot be set up as solenoid power sources.

TCRA CONNECTORS:

• JO - Writes the signals from the TCDA board to the TCRA board in location five for , , and . Write the signals from the TCDA board to the TCRA board in location four of the and core. Write the signals from the TCQE board in the core to the TCRA board in location four for the core to control the gas manifold blow-off valve control.
• JS2 - Connects relay outputs from TCRA to DTBC/D terminal board. TCRA is not connected to DTBC in .
• JS3 - Connects relay outputs from TCRA to DTBC/D terminal board. TCRA is not connected to DTBC in .
• JS4 - Connects relay outputs from TCRA to DTBC/D terminal board. TCRA is not connected to DTBC in .
• JS5 - Connects relay outputs from TCRA to DTBC/D terminal board. TCRA is not connected to DTBC in .
• JS6 - Connects relay outputs from TCRA to DTBC/D terminal board. TCRA is not connected to DTBC in .
• JS7 - Connects relay outputs from TCRA to DTBC/D terminal board. TCRA is not connected to DTBC in .
• JS8 - Connects relay outputs from TCRA to DTBC/D terminal board. TCRA is not connected to DTBC in .

TCRA CONFIGURATION:

Hardware: The hardware configuration that powers the relays or converts them into solenoids is done at the terminal board level on the DTBC (Digital Terminal Board C) and DTBD (Digital Terminal Board D). These boards facilitate the connection and control of various components within the system. The DTBC and DTBD are designed to provide reliable communication between the control system and the actuators, ensuring seamless performance of the turbine control system. The configuration of the terminal boards involves setting up relay or solenoid control signals and their corresponding input/output connections. This setup allows the system to interface with external equipment, such as valves, switches, and sensors, by either energizing or de-energizing relays or solenoids based on the control logic. The configuration process can include:

• Relay/solenoid mapping: Defining which relays or solenoids are connected to specific terminal points on the boards. This mapping ensures that the correct signals are sent to the appropriate components.

• Signal conditioning: Ensuring that the signals sent to the relays or solenoids are properly conditioned to meet the voltage and current requirements of the actuators, preventing damage to the system and ensuring consistent performance.

• Wiring and connectivity: Proper wiring of the DTBC and DTBD terminal boards to the corresponding field devices, such as actuators, sensors, and switches. The wiring must follow the system’s wiring diagrams and maintain correct polarity and grounding to ensure proper operation.

• Communication protocols: Configuring the communication between the terminal boards and the central control unit or other components in the turbine system. This can involve setting up protocols like Modbus or other proprietary communication methods to ensure proper data exchange between components.

• System diagnostics: After configuration, diagnostic tools may be employed to test the integrity of connections, verify relay and solenoid activation, and monitor the overall system performance. This helps identify any issues early on, minimizing downtime and ensuring the reliability of the system.

TCRA CONTACT OUTPUT CIRCUITS:

The relays on the TCRA boards are operated by signals originating from the CSP (Control Signal Processor), which sends these signals to the STCA (Signal Transmission Control Actuation) board over the COREBUS. The COREBUS serves as the communication medium for transmitting control signals between the CSP and the STCA board, ensuring synchronized data exchange and control actions.

Once the STCA board receives the control signals, it processes them and forwards the appropriate commands to the TCDA (Turbine Control Digital Actuation) boards through the IONET. The IONET is a dedicated communication network that allows for high-speed, real-time data transmission across multiple control and monitoring units within the turbine control system.
The TCDA boards then interpret these signals and send the appropriate command signals to energize or de-energize the relays. This action is achieved through the JO (Junction Output) connector, which is responsible for delivering the necessary current and voltage to the relay coils. The relays themselves control the actuation of various field devices, such as valves, pumps, and switches, by either opening or closing their contacts.

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FREQUENTLY ASKED QUESTIONS:

How does COREBUS communicate between the CSP and STCA boards?

COREBUS is the communication network that connects the Control Signal Processor (CSP) to the Signal Transmission Control Actuation (STCA) board. It transmits control signals in real time to ensure synchronized control actions between the system components.

What is the function of the JO connector?

The JO (Junction Output) connector is used to send the command signals from the TCDA board to energize or de-energize the relays. These signals control the opening and closing of relay contacts, which in turn manage the activation or deactivation of field devices such as valves, pumps, and switches.

What devices are controlled by the relays in the TCRA system?

The relays in the TCRA system control various field devices, including valves, switches, pumps, and other critical components within the turbine control system. These devices are activated or deactivated by the relays' open/close contacts.