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I/O functions of the DS200LDCCH1AKA drive control board used in the GE Mark V series gas turbine control system are described in detail in Chinese:
Core Functions Overview:
The DS200LDCCH1AKA board is a key component in the Drive Cabinet of the Mark V control system, taking on the roles of interface, signal conditioning, isolation, and drive control. It acts as a bridge between the main controller (e.g. <0> controller) and the final actuator (e.g. contactor, solenoid valve, motor drive/inverter) or field sensor.
Details of the main I/O functions:
Digital Inputs (DI - Digital Inputs).
Function: Receives switching status signals from field devices.
Typical signal sources: limit switches, pressure switches, temperature switches, liquid level switches, valve position feedback (open/close), contactor auxiliary contacts, emergency stop button status, safety interlock status, etc.
Characteristics:
Usually dry contact inputs (passive switch signals) with query voltage provided by the board.
The input channel is equipped with an opto-isolator to electrically isolate the field side (which may have high voltage and noise) from the control side to protect the control system.
With filtering function to eliminate the false action caused by contact jitter or noise.
Input status is indicated by on-board LEDs (typically green for on/off).
Digital Outputs (DO - Digital Outputs / Relay Outputs - Relay Outputs).
Function: Outputs switching commands to control the start/stop or state switching of field devices.
Typical loads: Contactor coils, relay coils, solenoid valve coils, small motor start/stop, indicator lights, alarms, etc.
Characteristics:
Typical relay output (the main output of DS200LDCCH1AKA card).
Relay contact capacity: Usually can withstand high load current (e.g. 5A-10A @ 120/240VAC or 24/48/125VDC), and can directly drive small and medium power devices.
Electrical Isolation: The coil side of the relay is isolated from the control logic circuitry and the contact side is connected to the field load, providing double isolation protection.
Output status is indicated by on-board LEDs (typically green for excitation/output active).
Some of the outputs may be used to drive components in other control cabinets or to provide status signals to other systems such as DCS.
Analog Inputs (AI - Analog Inputs - less common, but may be available in some configurations).
Function: Receive continuously varying analog signals from field sensors.
Typical sources: temperature (RTD/thermocouple via transmitter), pressure transmitters, position feedback (e.g. LVDT/RVDT via demodulator output), etc. for specific applications. (Note: Analog inputs are relatively rare in standard drive control functions and are more often handled by dedicated I/O cards; however, a few key analog inputs may be reserved or supported by this card)
Characteristics:
Typically accepts standard signal ranges (e.g., 4-20mA, 0-10V, +/-10V).
Includes signal conditioning (filtering, amplification/attenuation) and A/D conversion to convert analog to digital for reading by the controller.
Isolation: Typically also provides electrical isolation between channels or between the field and control side.
Special Drive Outputs (e.g. Pulse Width Modulation - PWM).
Function: Used to precisely control the speed, position or torque of certain actuators.
Typical application: Driving IGBT gates (power modules used to control the excitation current of an exciter). This is a core function of the board in gas turbine applications.
Features:
Receives PWM command signals from the main controller (e.g. <0>).
Power amplifies and isolates the PWM signal (typically using a pulse transformer or high speed optocoupler) so that it can safely and efficiently drive the gates of power semiconductor devices such as IGBTs.
May contain auxiliary power generation circuitry required for gate drive.
Communications Interface (typically backplane communications).
Function: High-speed data exchange with the main controller (e.g. <0>) or other boards in the Mark V control cabinet.
Characteristics:
Implemented via a dedicated backplane connector.
Follows GE Mark V system internal communication protocols
GE Mark V DS200LDCCH1AKA drive control board I/O module
GE Mark V DS200LDCCH1AKA drive control board I/O module
GE Mark V DS200LDCCH1AKA drive control board I/O module
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