IC3600ADAD1A - D/A Diode Converter Card

SPECIFICATIONS

Part No: IC3600ADAD1A
Manufacturer: General Electric
Function: D/A Diode Converter Card
Series: Mark I and II
Repair: 3-7 Day
Availability: In Stock
Country of Manufacturer: United States (USA)

Functional Description

IC3600ADAD1A is an over-temperature Card developed by GE. It is a part of Mark I and II control system. Designed to monitor exhaust gas temperatures and regulate turbine operation to avoid thermal damage. It is integrated into the system's temperature control loop, which is one of the two main loops in the architecture (the other being the speed loop).

Function and Role in the Temperature Loop

• The temperature loop serves the primary function of limiting the startup and operational temperature of the gas turbine to safe, design-specific values. Unlike modern systems that may monitor turbine inlet temperature directly, the Mark I and II systems rely on exhaust temperature as the primary input for temperature control.
• The card receives analog inputs from exhaust temperature sensors and uses this data to determine whether fuel cutback or other protective measures are required. It interfaces with the control system to adjust the Valve Command Equivalent (VCE) and regulate fuel flow accordingly.

Why is Exhaust Temperature Used

Several engineering considerations support the use of exhaust temperature over turbine inlet temperature:

• Sensor durability: Exhaust sensors operate in a less hostile environment, leading to longer service life.
• Sampling accuracy: Exhaust ducts allow for a more representative measurement of gas flow temperature.
• Material limitations: Components such as exhaust ducts, turbine inter-stage passages, and low alloy steel structures have thermal limits that must not be exceeded.
• System design: Proper gains, biases, and control logic in the Mark I/II system ensure that by limiting exhaust temperatures, turbine inlet temperatures are also kept within safe limits.

Sampling Technique: Twelve Even Area Criteria

To ensure accurate temperature control, the system relies on precise exhaust temperature sampling. Extensive factory and field testing, along with statistical analysis, led to the development of the twelve even area sampling criteria. This approach places twelve thermocouples evenly across the exhaust area to achieve:

• A true average exhaust temperature with a deviation of less than 5oF from the mean.
• High reliability and redundancy in temperature data.
• Reduced likelihood of false over-temperature trips due to uneven gas distribution.
• This robust sampling method supports the performance of the card in providing consistent and dependable protection.

WOC is happy to assist you with any of your GE requirements. Please contact us by phone or email for pricing and availability on any parts and repairs.

FREQUENTLY ASKED QUESTIONS

What is IC3600ADAD1A?
It is an Over-temperature Card developed by GE.

Why does the system monitor exhaust temperature instead of turbine inlet temperature?
Exhaust temperature is used as a primary control parameter because it allows for more reliable and durable sensor placement. It provides a representative measurement of turbine performance. It avoids placing sensors in the extreme conditions of the turbine inlet. The system uses calibration and biases to ensure inlet temperatures remain within design limits

What happens when an over-temperature condition is detected?
It processes temperature signals from exhaust thermocouples. If temperatures exceed preset thresholds, it initiates a fuel cutback via the control system to bring temperatures back to safe levels and protect turbine components.