GE IC3600 Series Modules: IC3600ADAHIC,

Technical Dossier

Product Details And Specifications

GE IC3600 Series Technical Notes

The GE IC3600 series represents one of General Electric's foundational control system platforms, deployed extensively across heavy industrial sectors including petrochemical refineries, power generation facilities, pulp and paper mills, and continuous process manufacturing plants. These boards formed the backbone of GE's Mark I and Mark II turbine control systems — architectures that remain operational in facilities where capital replacement costs for full system upgrades run into the millions of dollars. The IC3600 series is not a peripheral product line; it is embedded infrastructure in assets with 30–50 year operational lifespans.

The Evolution of IC3600 Architecture

The IC3600 platform was developed by GE as part of its SPEEDTRONIC turbine control family, initially introduced in the 1970s to provide analog and early digital control for gas and steam turbines. The architecture is characterized by modular printed circuit boards housed in card-cage racks, with each board performing a discrete function — analog input conditioning, digital output switching, power regulation, or signal processing.

Early IC3600 boards used through-hole component technology with discrete transistors and early-generation op-amps. This construction, while robust under stable thermal conditions, is susceptible to electrolytic capacitor degradation after 20–30 years of continuous operation. Boards from this era also rely on proprietary backplane bus protocols that are incompatible with modern fieldbus standards (PROFIBUS, FOUNDATION Fieldbus, EtherNet/IP), making direct digital migration non-trivial without full system replacement.

IC3600 Full Catalog & Functionalities (SKU List)

The following SKUs represent confirmed members of the GE IC3600 series, categorized by functional role. Each module performs a specific, non-interchangeable function within the Mark I/II turbine control rack.

Analog Input / Signal Conditioning Boards

• IC3600ADAHIC: Analog input PC board; signal conditioning for thermocouple and RTD inputs in turbine temperature monitoring circuits.
• IC3600AFAA1A: Analog function amplifier board; processes 4–20 mA process signals for speed and load control loops.
• IC3600AFAA1B: Revised analog function amplifier; improved gain stability over IC3600AFAA1A for high-vibration environments.
• IC3600AIAD1A: Analog input/output distribution board; routes multiple analog channels across the control rack backplane.
• IC3600AIAD1B: Updated distribution board with enhanced channel isolation for noise-sensitive measurement circuits.

Digital Input / Output Boards

• IC3600DIDA1A: Digital input board; 24 VDC discrete input acquisition for turbine trip and permissive logic.
• IC3600DODA1A: Digital output board; relay-driven discrete outputs for solenoid valve and alarm annunciator control.
• IC3600DODA1B: Enhanced digital output board; solid-state output option for high-cycle switching applications.
• IC3600DIDB1A: High-density digital input board; expanded channel count for complex interlock matrix applications.

Power Supply / Regulation Boards

• IC3600EPSA1A: DC power supply board; provides regulated +5 VDC and ±15 VDC rails to the control card cage.
• IC3600EPSA1B: Revised power supply board; improved thermal derating for high-ambient-temperature enclosures.
• IC3600VRDA1A: Voltage regulation and distribution board; manages bus voltage stability across multi-rack configurations.

Communication / Interface Boards

• IC3600SCBA1A: Serial communication board; RS-232/RS-422 interface for HMI and historian data exchange.
• IC3600TBAA1A: Terminal board adapter; field wiring termination interface for analog I/O modules.
• IC3600TBDA1A: Digital terminal board; field wiring termination for discrete I/O modules in hazardous-area installations.

Processor / Control Logic Boards

• IC3600LSCA1A: Logic sequencing and control board; executes turbine start/stop sequencing and protective relay logic.
• IC3600SRLA1A: Speed reference and load control board; governs turbine speed regulation and load-sharing in parallel generator configurations.

Sourcing Hard-to-Find & Obsolete IC3600 Parts

For facilities managing multi-year maintenance plans, DriveKNMS offers consignment reservation arrangements, allowing plant engineers to secure identified critical spares against future demand without immediate capital outlay. This is particularly relevant for IC3600 boards with known high failure rates due to electrolytic capacitor aging, including power supply and analog input conditioning modules.

Quality Control for the IC3600 Range

IC3600 boards present specific QC challenges due to their age, construction technology, and the criticality of their application. Our inspection and testing protocol for this series addresses the failure modes most commonly encountered in field-returned and long-stored units: