IC3600SVDC1D - Vibration Detector Board

SPECIFICATIONS

Part Number: IC3600SVDC1D
Manufacturer: GE Fanuc
Country of Manufacture: United States(USA)
Availability: In Stock
Product Type: Vibration Detector Board (SCB)

Functional Description

IC3600SVDC1D is a Vibration Detector Board manufactured by GE Fanuc. It is a part of Mark I and II used in gas turbine control systems. Its primary function is to detect excessive vibration levels from connected sensors and initiate protective or warning actions when necessary. This is critical in turbine applications where high vibration can indicate mechanical imbalance, misalignment, or failure of rotating equipment.

Signal Processing and Operation

• The Card receives an analog vibration signal from a sensor connected between terminals VIB and ACOM (analog common).
• It detects the peak value of the incoming signal and compares it to a user-defined reference level, which is set using the adjustable resistor R1.
• If the vibration signal's peak value exceeds the setpoint, the card latches a logical 1 at output T, indicating a vibration alarm condition.
• Simultaneously, a Trouble indicator light is illuminated to provide a visual alert.

Reset Functions

Once latched, the alarm output can be reset by either:

• Pressing the local reset pushbutton on the panel
• Applying a logical 1 signal to input RST (remote reset)

This latching behavior ensures that transient or momentary vibration spikes are not ignored and require operator acknowledgment.

Monitoring Points

• TP1 – TP2: Measure the peak vibration level detected from the sensor (real-time signal level).
• TP3 – TP4: Monitor the reference setpoint voltage configured by R1, useful for calibration and diagnostics.

Gain Adjustment

• For sensors with specific sensitivity characteristics—for example, a sensor outputting 0.2 volts peak per 3 inches/second of vibration velocity—additional gain may be required.
• Connecting Pin GAIN to ACOM doubles the gain of the detector circuit, making the card suitable for use with low-output sensors.

Sensor Fault Detection

To enhance reliability, the SVDC card includes a sensor fault detection feature, which identifies:

• Short-circuited sensors
• Open-circuited sensors

When a sensor fault is detected:

• The Trouble light is illuminated.
• Output A latches to a logical 1, signaling a sensor failure.

The fault latch must be reset either via the local pushbutton or a remote signal similar to the vibration latch circuit.

Sensor Fault Impedance Requirements

The card uses input impedance monitoring to validate sensor health. Depending on the installed jumper configuration, the expected impedance range for a no-fault condition is as follows:

• With no jumpers installed, the acceptable impedance range is 2.9K to 50K ohm.
• When Pin 9 is connected to P12V, the expected range is 80 to 800 ohm.
• When Pin 6 is connected to P12V, the acceptable range is 160 to 1.5K ohm.

These impedance values ensure that sensors are functioning correctly and help distinguish between wiring issues and actual sensor faults.

Setpoint Adjustment Range

The vibration trip point (via R1) is adjustable over the range of 0.25 to 1.6 inches/second, providing flexibility for various equipment and sensitivity requirements.

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FREQUENTLY ASKED QUESTIONS

What is GE Fanuc IC3600SVDC1D?
It is a Vibration Detector Board used in gas turbine control systems.

How does the card detect sensor faults?
The card uses input impedance monitoring to check whether the connected sensor is operating within an acceptable range. If the impedance falls outside the specified limits, it identifies the sensor as faulty (shorted or open).

What happens when a sensor fault is detected?
When a fault is detected, the card Latches Output A to 1, illuminates the trouble light, and requires a manual or remote reset to clear the fault indication.