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The GE part number IC3603A285A is a Source Selector Card. This electronic circuit board is a component of GE’s legacy Speedtronic Mark I and Mark II series of turbine control systems. Its primary function is to select between two or more input signals, ensuring that the control system uses the most reliable or appropriate signal at any given time.
Function and Key Features
A source selector card is a crucial component in systems that use redundancy for reliability. It allows the control system to switch between primary and backup sensors or control signals.
- Signal Switching: The card is designed with internal logic to choose between two or more input signals. This can be based on a variety of criteria, such as which signal is currently active, which signal falls within a normal operating range, or a manual selection.
- Redundancy: In a redundant system, there are two or three identical sensors or control loops. The source selector card is the gatekeeper that determines which of these redundant signals is passed to the main control logic. This ensures that if one sensor fails, the system can automatically switch to a working sensor without interrupting operation.
- Failure Detection: The card may also have built-in logic to detect a failure in one of the input signals, such as a loss of signal or a reading that is out of a normal range. When a failure is detected, the card will automatically switch to the alternate source.
- Robust Design: Like all GE industrial control boards, it’s built to withstand the harsh conditions of a power plant, including vibrations, temperature fluctuations, and electromagnetic interference.
Applications
The IC3603A285A 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:
- Safety and Reliability: It provides a critical layer of safety by ensuring the control system always has access to a reliable signal, preventing a false shutdown or a missed trip.
- Control Loops: It’s often used in speed, temperature, or pressure control loops where multiple sensors are used for redundancy.
