SPECIFICATIONS
Part Number: IC3600VDAD
Manufacturer: General Electric
Country of Manufacture: United States (USA)
Series: Mark I and II
Function: D/A Converter Card
Functional Description
IC3600VDAD is a D/A Converter Card developed by GE. It is part of the GE Speedtronic Mark I and II control system. It functions within the Digital Setpoint (DSP) system, converting programmable digital signals into precise analog outputs used as speed or load reference signals. Together with the SSLE card and associated control signals, the VDAD card ensures accurate and dynamic turbine control based on digitally set operational parameters.
Features
- Core Function: Generates an adjustable analog signal that acts as a programmable setpoint for turbine speed or load control. This analog signal is outputted through the SAOUT terminal and used by the speed control card to regulate turbine operation in real time.
- 12-bit Reversible Counter: This counter can count up or down depending on the logic signals received. When the ENAB (Enable) input is at logic 0, the counter is active and ready to operate. The direction of counting is determined by the DN/UP input. If DN/UP is at logic 0, the counter counts up; if at logic 1, the counter counts down. The CCP input provides a pulse rate that sets the speed at which the counter operates, with each pulse causing the counter to increment or decrement according to the system's steering logic.
- Visual Output Indicators (LEDs): The card includes twelve LEDs mounted directly on the board. Each LED corresponds to a single bit in the 12-bit counter, providing a clear and immediate visual display of the counter’s binary output. This feature aids technicians in system diagnostics and monitoring by offering a straightforward view of the counter’s current state.
- Analog Output (SAOUT): It uses an onboard digital-to-analog (D/A) converter to produce an analog voltage output known as SAOUT. The standard output range is nominally 0 to 8 volts when no jumper is installed between terminals SJA and SJB. If a jumper is installed between SJA and SJB, the output range shifts to nominally -4 to +4 volts. This selectable voltage range gives flexibility to meet different operational requirements within the control system.
- Preset Capability (Manual Counter Setting): Offers a preset capability, allowing operators or automated sequences to quickly load a specific binary value into the counter. To preset the counter, a logic 1 is applied to the bits intended to be set and a logic 0 to the bits intended to be cleared. A single-shot pulse signal (T) is then applied to the LOAD input to load the new settings into the counter simultaneously. This functionality provides the ability to adjust turbine operating points instantly without waiting for incremental counting.
- Full and Empty Counter Detection: The card provides important status feedback through output signals MM1, MM2, and MM3. When the counter reaches an empty condition while counting down, or reaches full while counting up, these three outputs all transition to a logic 1 state. This feature is critical for system protection and automation, as it can be used to trigger alarms, safety shutdowns, or load adjustment procedures based on the turbine's operational status.
- Integration with the System: The card works closely with the SSLE card and other associated control signals within the Speedtronic system. The D/A output from the VDAD is amplified and conditioned by the SSLE card, which can invert or adjust the gain of the signal as needed. Together, these cards form the foundation of the digital setpoint system, allowing precise and programmable control over turbine speed and load operations.
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FREQUENTLY ASKED QUESTIONS
What is IC3600VDAD?
It is a D/A Converter Card and is part of the GE Speedtronic Mark I and II gas turbine control system.
How does the card perform counting operations?
It contains a 12-bit reversible counter. When the ENAB input is logic 0, the counter becomes active and can either count up or down based on the DN/UP input signal. The CCP input pulse rate determines the speed of counting.
How can I preset the counter on the card?
To preset the counter, apply a logic 1 to the bits you want to set and a logic 0 to the bits you want to clear. Then, send a single-shot pulse to the LOAD input to load the preset value into the counter.
What do the LEDs on the card indicate?
It has twelve LEDs that display the binary output of the 12-bit counter. They offer a visual indication of the counter’s current state, assisting with monitoring and troubleshooting.
