IC3600SSZD1 - Speed Control Sensor Card

SPECIFICATIONS

Part No: IC3600SSZD1
Manufacturer: General Electric
Function: Speed Control Sensor Card
Series: Mark I and II
Repair: 3-7 Day
Availability: In Stock
Country of Manufacturer: United States (USA)

Functional Description

IC3600SSZD1 is a Speed Control Sensor Card developed by GE. It is a part of Mark I and II control system. It is part of the system that monitors and regulates the speed of the turbine by detecting changes in speed and transmitting that data to the control logic. This enables the system to adjust fuel flow and other parameters to maintain optimal turbine performance and prevent overspeed conditions. The card is mounted on the turbine control panel and interfaces with other system components through its standardized pin connectors.

Speed Loop Features

• The speed loop is the most critical operating loop within a gas turbine control system, playing a central role in maintaining stable and efficient turbine performance. This loop is responsible for continuously monitoring and regulating the rotational speed of the turbine to match the desired set-point. It comprises several key components, including speed sensors, signal amplifiers, set-point and feedback mechanisms, pulse rate-to-analog converters, and scaling resistors. Together, these components form a closed-loop system that enables real-time adjustments based on deviations from the desired operating speed.
• For single-shaft machines, the speed signal is typically derived from either an inductor alternator or magnetic pick-ups, depending on the specific design and operational requirements. These sensors detect the rotational speed of the turbine shaft and convert it into an electrical signal that the control system can process.
• In contrast, two-shaft turbines require separate speed monitoring for each shaft. In this configuration, a dedicated set of magnetic pick-ups is installed near the load (power) turbine shaft to provide accurate speed feedback for the power output section. Meanwhile, the inductor alternator or another set of magnetic pick-ups is used to monitor the high-pressure (HP) or gas generator shaft, ensuring independent control and protection of each shaft system.
• This configuration allows for precise speed regulation across varying load conditions and helps ensure the safe and efficient operation of the turbine across its full range of performance. 

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FREQUENTLY ASKED QUESTIONS

What is IC3600SSZD1?
It is a Speed Control Sensor Card developed by GE.

Why is the speed loop considered the most important loop?
Because turbine speed directly affects performance, output, and safety, Overspeed conditions can lead to catastrophic failure, while under-speeding can reduce efficiency. The speed loop continuously maintains the correct balance.

What components make up the speed loop?
Key components include speed sensors (inductor alternators or magnetic pick-ups), signal amplifiers, set-point and feedback control systems, pulse rate-to-analog converters, and scaling resistors.

How is speed detected in one-shaft machines?
In single-shaft configurations, the turbine’s speed is usually sensed using an inductor alternator or magnetic pick-ups, which are mounted directly on the turbine shaft.