IC3600SFUA1C - Fuel Flow Control Card

SPECIFICATIONS

Part Number: IC3600SFUA1C
Manufacturer: GE Fanuc
Country of Manufacture: United States(USA)
Availability: In Stock
Product Type: Fuel Flow Control Card (SCB)

Functional Description

IC3600SFUA1C is a Fuel Flow Control Card manufactured by GE Fanuc. It is a part of Mark I and II used in gas turbine control systems. It features two PR/A converters that receive signals from magnetic pickups, convert them to analog outputs (OUT 1 and OUT 2), and send the larger, amplified signal as a negative analog output (FEN) to the SFKC regulator as fuel flow feedback.

Functionality and Signal Processing

The card contains two Precision-to-Analog (PR/A) converters, each designed to handle input signals from independent magnetic pickup sensors. These sensors typically monitor the speed of the fuel flow divider, which is proportional to the fuel flow rate.

• OUT 1 and OUT 2 are the analog outputs of the two PR/A converters.
• These outputs are proportional to the frequency of the signals from their respective sensors, which represent flow rates.
• The card then selects the higher of the two signals, amplifies it, and produces a negative analog output signal at the FEN terminal.
• This FEN signal serves as the fuel flow feedback input to the SFKC regulator card.

Role in the Universal Liquid Fuel Control System

The Universal Liquid Fuel Control System consists of two nested control loops:

1. Outer Control Loop – Flow Control

Purpose: Ensures correct fuel flow rate to the combustion system.

Components:

• SFUA card: Provides flow feedback derived from magnetic pickups monitoring the fuel divider.
• SFKC card: Sums the flow reference signal (a function of turbine control signals like VCE and turbine speed) with the flow feedback signal (from SFUA) to generate a flow error signal.

2. Inner Control Loop – Bypass Valve Position Control

Purpose: Controls the position of the fuel bypass valve for precise fuel delivery.

Components:

• SSVF card: Provides valve position feedback.
• SSVG card: Compares the valve position reference with the feedback and provides forward gain to command the fuel servo valve.

For systems using a modulated fuel pump stroke, only this inner position loop is necessary for effective control.

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FREQUENTLY ASKED QUESTIONS

What is GE Fanuc IC3600SFUA1C?
It is a Fuel Flow Control Card used in gas turbine control systems.

How does the SFUA card measure fuel flow?
It uses two PR/A converters connected to magnetic pickups that convert frequency signals into analog outputs proportional to flow rate.

What is the purpose of the FEN output signal?
The FEN output provides a negative analog signal representing the selected flow rate, which is used as feedback to the SFKC regulator.

What role does the card play in the fuel control system?
It operates in the outer flow control loop, supplying flow feedback for accurate regulation of liquid fuel delivery.