GE IC3600ALTC

Product Overview

The GE IC3600ALTC is a critical analog input terminal control module in General Electric’s (GE) Mark IV Speedtronic™ series of gas turbine and steam turbine control systems. This module plays a vital role in complex turbine control architectures, specifically responsible for receiving and processing analog signals (typically 4-20mA or 1-5V DC) from field sensors (such as temperature, pressure, and flow transmitters). As part of the Mark IV system’s I/O subsystem, the IC3600ALTC converts high-precision analog signals into digital data recognizable by the control system, providing real-time, reliable process variable inputs for protection, sequence control, and regulatory loops.

Product Parameters

Product Model: IC3600ALTC
Manufacturer: General Electric (GE)
Product Type: Analog Input Terminal Control Module (Turbine Control Terminal Board)
Input Signal Type: Analog (4-20mA, 1-5V DC, or other configurable ranges)
Number of Input Channels: Typically multiple channels (specific quantity depends on the exact version/drawings)
Signal Isolation: Isolation between channels and between channels and the system (typically 1500V AC isolation voltage)
Accuracy: High precision (typically ±0.1% F.S. or higher, depending on configuration)
Resolution: High resolution (usually 12-bit or higher A/D conversion)
Supply Voltage: +5V DC, +15V DC, -15V DC (provided by the Mark IV rack backplane)
Power Consumption: Low-power design (specific value depends on the number of active channels)
Operating Temperature Range: 0°C to +60°C (32°F to 140°F) (industry standard, specific versions may have a wider range)
Storage Temperature Range: -40°C to +85°C (-40°F to 185°F)
Protection Rating: Designed for installation in control cabinets (IP20 or similar)
Weight: Approximately 0.35 kg
Installation Method: Vertically inserted into a dedicated Mark IV system rack/cage, connected via a backplane connector
Communication Interface: Communicates with the main controller through the Mark IV backplane bus

Structure and Composition

Front Connector/Terminal Block: Provides physical connection points for field sensor cables, usually using screw terminals or pluggable terminal blocks for easy wiring and maintenance. Each channel corresponds to an independent terminal.
Multiplexer (MUX): Sequentially switches analog signals from multiple channels to the subsequent common processing circuit, reducing costs and minimizing volume.
Analog-to-Digital Converter (ADC): A core component that converts the conditioned analog voltage signals into digital values processable by the control system. The IC3600ALTC uses a high-precision, high-resolution ADC chip.
Isolation Circuit: Uses optocoupler isolators or transformer isolation technology to provide electrical isolation between input channels, between input channels and the module’s internal logic circuits, eliminating ground loop interference and improving noise immunity and safety.
Logic Control Circuit: Contains a microcontroller or programmable logic device (PLD) responsible for controlling the multiplexer switching timing, ADC start and read operations, data temporary storage, and data exchange with the Mark IV main controller through the backplane interface.
Status Indicators (LEDs): Usually located on the front of the module, providing visual indicators for power, channel status, faults, etc.
Backplane Interface Connector: Gold fingers or high-density connectors used to insert the module into the Mark IV rack, obtain operating power, and communicate with the system backplane bus.

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