Description

Application Scenarios

At a coal-fired power plant in Pennsylvania,the original Mark I control system had been operating since 1982.During a routine audit,engineers discovered that several IC3600LTGA modules were showing signs of capacitor aging and signal drift.To avoid unplanned outages,the plant initiated a phased replacement program using refurbished and tested IC3600LTGA units from a certified supplier.Each module was bench-tested for timing accuracy,logic execution,and thermal stability before installation.After replacement,the control system demonstrated improved response time and reduced false trip incidents.The engineering team credited the IC3600LTGA upgrade with extending the plant’s operational life by 5–7 years—proving that even vintage control hardware,when properly maintained,can support critical infrastructure well beyond its expected lifecycle.

Parameter

Main Parameters Value/Description

Product Model IC3600LTGA

Manufacturer GE Fanuc Automation(General Electric)

Product Category CPU/Logic Processor Module

System Platform GE Speedtronic™Mark I and Mark II Turbine Control Systems

Function Central Logic&Timing Control–Executes turbine sequencing and protection logic

Architecture 16-bit TTL-based logic circuitry–discrete component design(pre-microprocessor)

Mounting Card-edge insertion into Mark I/II backplane–19-inch rack compatible

Power Supply±15VDC and+5VDC from system backplane–regulated by power modules

Cooling Convection or forced air(via cabinet blower)–no internal fan

Operating Temperature 0°C to+55°C–controlled environment required

Dimensions Approx.12″x 5″(standard Mark I/II card size)

LED Indicators Status LEDs for power,logic activity,and fault conditions(model-dependent)

Certifications Designed to meet industrial control standards of the 1970s–80s era

Technical Principles and Innovative Values

Innovation Point 1:The IC3600LTGA was one of the first solid-state replacements for electro-mechanical relay logic in turbine control.By replacing banks of relays with integrated TTL logic circuits,it significantly improved reliability,reduced maintenance,and enabled more complex control sequences—pioneering the digital transformation of power plant automation.

Innovation Point 2:Engineered for real-time deterministic performance,the IC3600LTGA processes turbine safety and control logic with predictable timing.This is critical during events like overspeed detection or flame failure,where millisecond-level response can prevent catastrophic equipment damage.

Innovation Point 3:Designed for modular redundancy and diagnostics,the IC3600LTGA works in conjunction with other Mark I/II modules(e.g.,IC3600LCCA,IC3600STRT)to form a distributed control architecture.Its plug-in design allows for quick fault isolation and replacement—minimizing turbine downtime.

Innovation Point 4:Despite its age,the IC3600LTGA’s simplicity contributes to its longevity.With no operating system or software to patch,it is immune to cyber threats and software obsolescence—making it a stable,if outdated,solution in air-gapped industrial environments.

Application Cases and Industry Value

A combined-cycle plant in Texas upgraded its auxiliary turbine control system by retaining the IC3600LTGA as the core logic processor while adding modern HMI and data logging via a protocol gateway.The IC3600LTGA continued to handle safety-critical logic,while a new Ethernet interface allowed operators to monitor status and trends remotely.This hybrid retrofit approach extended the system’s usability without compromising safety—demonstrating how legacy CPUs can be integrated into modern digital infrastructures.

In another case,a paper mill in Maine avoided a$2M turbine control system replacement by sourcing and refurbishing IC3600LTGA modules.The cost of refurbishment was less than 10%of a full upgrade,and the plant maintained operational continuity.Engineers noted that the IC3600LTGA’s predictable behavior and well-documented logic made troubleshooting easier than with newer,software-heavy systems.

Installation,Maintenance,and Full-Cycle Support

Installing the IC3600LTGA requires powering down the Mark I/II control cabinet,removing the front panel,and carefully inserting the module into the correct slot on the backplane.Ensure proper grounding and secure retention.After power-up,verify LED status and perform functional tests using turbine control procedures.

Due to its age,regular maintenance is critical:

Inspect for capacitor bulging or leakage

Clean dust and corrosion from connectors

Verify power supply voltages

Test logic sequences during scheduled outages

Although GE no longer manufactures the IC3600LTGA,certified third-party suppliers offer refurbished,tested,and warrantied units.We provide full lifecycle support,including:

Functional testing and burn-in

Spare part stocking programs

Migration planning to Mark VIe or other modern platforms

Technical documentation and wiring diagrams

On-site support for critical replacements

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