GE IS200VSCAH2A VME Servo Control Board

GE IS200VSCAH2A VME Servo Control Board

Part Number IS200VSCAH2A Manufacturer General Electric Country of Manufacture As Per GE Manufacturing Policy Series Mark VI Function Module Availability In StockGeneral Electric's IS200VSCAH2A is a board component for the Mark VI. GE released the Mark VI as part of their long-running and popular Speedtronic series of gas/steam turbine management systems, which began in the 1960s with the Mark I system. With the Mark VI and Mark VIe, this series of turbine control continued to evolve into the 2000s. The Mark VI is an advanced turbine control system with Ethernet connectivity and a linked operator interface comprised of a PC running Windows. As a Serial Communication Input-Output board, the IS200VSCAH2A is used. 

This component provides I/O interfaces for independent devices that employ serial communication protocols such as RS-422, RS-485, or RS-232C. The board connects to these independent devices via the front panel connectors using a DSCB terminal board. The maximum cable length for RS-232C serial connections is 50 feet. Up to 1000 feet of wire can be used for further connections. A front faceplate is included with the IS200VSCAH2A. This is a single-slot board with various components, including three LEDs. Run, Fail, and Status are the three options. 

When a diagnostic alarm situation is present, the status light will illuminate. There are nineteen jumpers on the IS200VSCAH2A. This comprises three-position jumpers for determining electrical characteristics of ports (JP1-JP6), transmission line configuration (JP7-JP12), and receive line termination configuration (JP1-JP6) (JP13-JP18.) A two-position jumper switch (JPU1) on the board allows you to choose between Modbus and Honeywell pressure transducer operation. Over forty integrated circuits make up the IS200VSCAH2A. Oscillating chips, universal asynchronous receiver transmitters, and an FPGA are among the components (field-programmable gate arrays). Capacitors, resistors, and transformers are all on the board.

Diagnostics

Three LEDs at the top of the VSVO front panel display status data. The regular RUN state is flashing green, while FAIL is solid red. The third LED is STATUS, which is generally off but flashes a constant orange if the board has an alarm condition. The following diagnostic tests are included:

The output servo current is excessive or not reacting, resulting in a fault.

The regulator feedback (LVDT) signal has exceeded its limitations. When a problem occurs, the related regulator's poor sensor is removed from the feedback computation and the good sensor is used.

The servo suicided. This results in a flaw.

The A/D converter calibration voltage is out of range and is being utilized as a default value.

The excitation voltage of the LVDT is out of range. A flaw is made.

The difference between the input signal and the chosen value exceeds the TMR differential limit. This results in the creation of a fault indicating a problem with this sensor input.

If any of the foregoing signals becomes unhealthy, a composite diagnostic alert, L#DIAG VSVO, is triggered. The toolbox contains information about the individual diagnoses. Individual diagnostic signals can be latched and reset with the RESET DIA signal if they become healthy.

Terminal board connectors JR1, JS1, and JT1 each have their own ID device that is interrogated by the I/O board. The ID device is a read-only chip that contains the serial number, board type, revision number, and plug location of the terminal board. When VSVO reads the chip and detects a mismatch, a hardware incompatibility fault is generated.

Digital Servo Regulators

The Digital Servo Regulators n = 1-4 splits the servo regulators into the software and hardware portions of the control loop. The user can select the servo feedback from the LVDT and pulse rate inputs.

The LVDT input is a 3.2KHz sinusoidal signal, the magnitude of which is proportional to the position of the electromechanical valve controlled by the servo output. The pulse rate input is a TTL-type signal or some other periodic signal that activates a comparator input. An FPGA on the VSVO counts the comparator output transitions and converts them to a flow rate. For LVDT feedbacks, LVDT1 - 12 are scaled and conditioned in the Digital regulator's Position Feedback function, and can also be independently conditioned by a separate Monitoring function. The presence of an asterisk after a block name indicates the existence of a more detailed graphic to better define the block function.

All VSVO signal space I/O is labeled as si for system input, which means the controller reads the signal space variable from the servo card, or so for system output, which means the controller writes the signal space variable to the servo card. Italic text is defined as a configuration parameter that the Toolbox can edit to redefine the VSVO's operation. Variable Name is an internal variable that the user cannot see using the Toolbox.

Servo Suicide Control

The Servo Suicide compares the absolute value of the filtered servo current error to the Sui Margin configuration parameter value. This detector determines whether the hardware servo current regulator has lost current control. If the current feedback does not match the current command, a diagnostic is generated, and the servo current output is disabled (disabled and put in a safe state).

1 PulseRate /2 PulseRateMax

The Digital Servo regulator is set up as a flow-rate controller. The feedback for the 1 PulseRate version of the flow-rate regulator is a pulse signal with a frequency proportional to the flow-rate of the liquid fuel.

The bigger pulse rate frequency is chosen as the feedback for the flow rate regulator in the dual input instance. System Limit functions are given to monitor each of the pulse rate inputs and are enabled via the SysLimxEnabl configuration parameter. It can latch the signal space limit flags, SysLimxPR1 and/or SysLimxPR2, if desired.The Digital Servo regulator is set up as a flow-rate controller. The feedback for the 1 PulseRate version of the flow-rate regulator is a pulse signal with a frequency proportional to the flow-rate of the liquid fuel.

The bigger pulse rate frequency is chosen as the feedback for the flow rate regulator in the dual input instance. System Limit functions are given to monitor each of the pulse rate inputs and are enabled via the SysLimxEnabl configuration parameter. It can latch the signal space limit flags, SysLimxPR1 and/or SysLimxPR2, if desired.