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The GE part number IC3600VRCC1 is a Reversible Counter Card. This electronic circuit board is a component of GE’s legacy Speedtronic Mark I and Mark II series turbine control systems. Its primary function is to count pulses from a speed sensor and provide a control signal based on a pre-set value, which can be either a positive or negative count.
Function and Key Features
The reversible counter card is a type of electronic counter that can be incremented (count up) or decremented (count down) by an input signal. This capability is vital for sophisticated control logic.
- Counting Pulses: The card takes a pulse signal from a sensor, such as a magnetic pickup on a turbine shaft, and increments a counter for each pulse.
- Directional Control: The “reversible” feature means the card can count in either direction. For example, it can be used to monitor the turbine’s speed during both acceleration and deceleration, providing a more comprehensive control signal.
- Setpoints and Output: The card has a pre-set value (a setpoint). When the counter reaches this setpoint, it triggers an output signal. This signal can be used to initiate an action, such as opening a valve or engaging a clutch.
- Control Logic: It is a key building block for complex control logic within the turbine panel. For example, it can be used to ensure that a turbine has reached a specific speed before proceeding with the next step in a startup sequence.
Applications
The IC3600VRCC1 is a legacy component, so it is primarily used in power generation facilities that still operate GE’s older Mark I and Mark II turbine control systems. It is an essential component for:
- Turbine Startup and Shutdown: The card is used to manage the precise sequencing of events during a turbine startup or shutdown.
- Speed and Load Control: It helps to ensure that the turbine reaches the correct speed and stays within a safe operating range during various load conditions.
- Safety Systems: It can be used to implement safety interlocks that prevent the system from proceeding unless a certain speed or position has been reached.
