IC3600SVDC1F1B - Vibration Detector Board

SPECIFICATIONS

Part Number: IC3600SVDC1F1B
Manufacturer: GE Fanuc
Country of Manufacture: United States(USA)
Availability: In Stock
Product Type: Vibration Detector Board (SCB)

Functional Description

IC3600SVDC1F1B is a Vibration Detector Board manufactured by GE Fanuc. It is a part of Mark I and II used in gas turbine control systems. It processes input signals from vibration sensors and provides both alarm output and fault detection capabilities to protect critical rotating machinery.

Vibration Signal Processing

• The card receives an analog vibration signal via a dedicated input (VIB), with a return path through analog common (ACOM).
• This signal is passed through an amplification and peak detection circuit, which extracts the peak vibration level from the input waveform.
• The detected peak is compared against a reference setpoint, which is manually adjustable using a potentiometer (R1).
• If the peak vibration exceeds this reference, a latching alarm circuit is triggered. This sets a logical high signal (1) on the T output, indicating a vibration limit violation.
• The alarm state also activates a trouble indicator (lamp), signaling the need for operator attention.

Alarm Reset and Control Logic

• The alarm latch can be reset locally using a pushbutton (RESET_PB) or remotely by applying a logical 1 to the RST input.
• A separate latch output (A) provides a trip signal or can be used for external logic interfacing.
• Additional control lines include a CLAMP feature and CLEAR (CLR) input, offering further control of latch behavior and testing.

Sensor Fault Detection Circuit

The SVDC card includes a fault detection mechanism that continuously monitors the input sensor’s electrical condition. It checks for open-circuit or short-circuit faults by measuring the impedance of the connected sensor. When a sensor fault is detected:

• The fault latch sets the A output to 1
• The trouble lamp is illuminated
• Reset is again required via the local pushbutton or a remote control signal

Test Points and Calibration

The card provides test terminals for both operational monitoring and calibration:

• VIB.LEVEL (VLEV): Allows measurement of the current peak vibration level being detected
• SET POINT (VSTD): Measures the voltage representing the alarm trip setpoint
• Test Points RD, BK, NV2: Provide reference voltages and grounding for calibration

This enables technicians to fine-tune the alarm threshold and verify real-time system response during maintenance checks.

Gain and Sensitivity Configuration

• The card includes a GAIN pin, which, when connected to ACOM, doubles the signal gain. This allows compatibility with sensors having lower voltage output (e.g., 0.2 V peak for 3 in/sec vibration velocity).
• Sensitivity adjustment via R1 supports a trip setpoint range from 0.25 to 1.6 in/sec.

Power Supply and Signal Connections

The card operates using standard control voltages:

• +12V (P12V) for logic power
• –12V (N12V) for grounding reference

Outputs and control signals interface with turbine trip logic and indicator panels via terminal points such as:

• 3VT, 39VT: Connected to trip and alarm channels
• FLT, VD, SVDC, VIB2 TRIP: Used for identification and channel assignment

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FREQUENTLY ASKED QUESTIONS

What is GE Fanuc IC3600SVDC1F1B?
It is a Vibration Detector Board used in gas turbine control systems.

How is the vibration alarm triggered?
The card detects the peak value of the incoming vibration signal. If this value exceeds the setpoint adjusted via R1, a latched alarm output is activated, and the trouble indicator turns on.

What is the role of the GAIN pin?
Connecting the GAIN pin to ACOM doubles the detector’s gain, allowing it to work with low-sensitivity sensors, such as those producing 0.2 V peak for 3 in/sec vibration.

How does the SVDC card detect a sensor fault?
It includes a fault detection circuit that monitors the impedance of the connected sensor. If the impedance is outside expected limits (shorted or open), the A output is latched, and the trouble light illuminates.

Can the sensor fault latch be reset remotely?
Yes, the sensor fault latch can be reset using the same local pushbutton or through a remote control signal.