DS3800HRIA - High-Level Input Card

SPECIFICATIONS:

Part Number: DS3800HRIA
Manufacturer: General Electric
Series: Mark IV
Product Type: High-Level Input Card
Input Signal Range: 0-30 V RMS
Input Frequency Range: DC to 1 kHz
Operating Temperature Range: -20 °C to +70 °C
Connector Type: DIN 41612 96-pin
Size: 8.24 cm high x 4.16 cm
Repair: 3-7 days
Availability: In Stock
Weight: 0.5 kg
Country of Origin: United States

FUNCTIONAL DESCRIPTION:

DS3800HRIA is a High-Level Input Card manufactured and designed by General Electric as part of the Mark IV Series used in GE Speedtronic Gas Turbine Control Systems. The card is designed to interface with analog signals in the voltage range of approximately 1 V to 30 V RMS or peak, sourced from high-level transducers such as Linear Variable Differential Transformers (LVDTs), servo loop position sensors, piezoelectric vibration probes, and high-span piezoresistive or strain-gauge pressure transmitters integral to turbine condition monitoring and feedback control loops. The input front-end circuitry employs precision voltage divider attenuators with low-temperature coefficient, tightly matched impedance networks, and buffered differential amplifier stages to attenuate and condition the signals, ensuring compliance with the ±10 V full-scale input range of the downstream sigma-delta or successive approximation ADC modules within the Speedtronic control processor. High input impedance (>100 kΩ differential) is maintained to minimize sensor loading and preserve measurement accuracy by reducing signal distortion and loading-induced phase shifts.

OPERATION:

Upon receiving high-level analog signals from turbine field transducers, the DS3800HRIA input card first routes the signals through precision attenuation networks to scale the voltage to the required ±10 V range for internal processing. The scaled signals then pass through galvanic isolation stages, typically implemented with high-frequency isolation transformers or optocouplers, to eliminate common-mode voltages and transient disturbances originating from turbine auxiliary equipment and prevent electrical noise propagation into the control processor.

Following isolation, the conditioned signals are filtered by active low-pass filters designed with cutoff frequencies aligned to turbine control loop bandwidth requirements, typically ranging from 100 Hz to 1 kHz. This filtering suppresses high-frequency electromagnetic interference generated by switching devices, excitation systems, and generator operation. The resulting clean signals are delivered via the card’s backplane interface to the Mark IV control system’s analog-to-digital converters, enabling precise digitization for closed-loop control algorithms, protective trip logic, and real-time turbine condition monitoring.

COMPATIBILITY:

The DS3800HRIA High-Level Input Card is fully compatible with the GE Mark IV Speedtronic control system architecture, interfacing through the standardized I/O backplane connectors designed for modular signal cards. It supports integration with Mark IV control processors, including the 531, 532, and 533 models, providing high-level analog input capabilities required for advanced turbine monitoring and control functions.

The card interfaces with a broad range of field devices commonly used in gas turbine systems, including LVDTs, servo position transducers, vibration sensors, and high-range pressure transmitters. It complies with GE’s electrical and mechanical specifications for backplane pinouts, signal conditioning, and isolation standards, ensuring seamless interoperability with other Mark IV modules such as the DS3800HRIC Input Cards and DS3800HRRA Relay Cards. The DS3800HRIA is backward-compatible with legacy Mark IV installations and supports system firmware versions from R5 onwards.

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FREQUENTLY ASKED QUESTIONS:

What is the input voltage and signal type range supported by the DS3800HRIA?

The card supports unipolar or bipolar analog voltage inputs ranging from 0 to 30 V RMS or peak, compatible with AC or DC sensor outputs typical of LVDTs, servo position sensors, and pressure transmitters.

What are the frequency response and filtering characteristics of the input signals?

The module includes low-pass filters with configurable cutoff frequencies between 100 Hz and 1 kHz, designed to attenuate high-frequency noise and prevent aliasing in the control system’s ADC sampling.

What should I check if the input signal is not being registered by the control system?

Verify the continuity of field wiring and connectors to the card. Check for proper sensor excitation and signal presence at the card input terminals using a calibrated multimeter or oscilloscope. Inspect card status LEDs (if available) and system diagnostics for input fault flags.