The GE DS3800DSQD1A1A is a Digital Servo Quad Driver board for the GE Speedtronic Mark IV turbine control system. It provides high-current drive outputs for large electro-hydraulic servo valves, delivering up to ±250mA per channel. The “1A1A” suffix indicates the initial production revision, featuring discrete power transistors, fixed dither options, and proven reliability for driving high-torque actuators.
The GE DS3800DSQD is a Digital Servo Quad Driver board for the GE Speedtronic Mark IV turbine control system. It provides high-current drive outputs for electro-hydraulic servo valves, specifically designed for larger valves requiring higher drive current than the DS3800DSAB series can deliver. The “DSQD” designation indicates a quad-channel driver with enhanced power output and thermal management.
The GE DS3800DSFC1A1A is a Digital Servo Feedback Conditioning board for the GE Speedtronic Mark IV turbine control system. It conditions signals from LVDT, RVDT, and resolver position feedback devices, converting them into ±10Vdc analog outputs for the Mark IV processor. The “1A1A” suffix indicates the initial production revision with discrete component-based demodulation circuits and fixed excitation frequency options.
The GE DS3800DSFC is a Digital Servo Feedback Conditioning board designed for the GE Speedtronic Mark IV turbine control system. Unlike the DS3800DSAB series which provides servo valve drive current, the DS3800DSFC is dedicated to signal conditioning and processing for position feedback devices (LVDTs, RVDTs, and resolvers). It interfaces between the field-mounted feedback sensors and the Mark IV processor, converting analog position signals into digital data for closed-loop control algorithms.
The GE DS3800DSAB1A1A is a Digital Servo Amplifier Board for the GE Speedtronic Mark IV turbine control system. It provides 4 independent servo valve drive channels with integrated LVDT/RVDT feedback conditioning. The “1A1A” suffix indicates the initial production revision with proven reliability, featuring discrete component-based PID circuits and fixed dither generation.
The GE DS3800DSAB is a Digital Servo Amplifier Board designed for the GE Speedtronic Mark IV turbine control system. Unlike the relay output boards previously discussed, this board serves as the analog drive interface for electro-hydraulic servo valves that control fuel flow, steam admission, and inlet guide vanes. The “DSAB” designation indicates a dedicated servo amplifier with PID (Proportional-Integral-Derivative) conditioning circuits, converting low-level analog commands from the Mark IV processor into high-current drive signals for the torque motors of servo valves.
The GE DS3800DRRA1C1B is a Digital Relay and Remote Alarm board for the GE Speedtronic Mark IV turbine control system. It provides 16 relay outputs for remote signaling to plant DCS, SCADA, and alarm panels. The “1C1B” suffix indicates a mature revision with upgraded switching regulators for relay coil power, enhanced transient protection, and improved backplane noise filtering compared to earlier versions.
The GE DS3800DRRA is a Digital Relay and Remote Alarm board designed for the GE Speedtronic Mark IV turbine control system. Unlike the DS3800DRFA series, which focuses on local output and flag indication, the DS3800DRRA is specifically engineered for remote signaling and annunciation. It provides relay outputs that interface with plant-wide Distributed Control Systems (DCS), SCADA systems, and remote alarm panels. The “DRRA” designation indicates a board optimized for long-distance signal transmission with enhanced isolation and higher contact ratings for driving external equipment.
The GE DS3800DRFA1B1A is a Digital Relay and Flag Output board for the GE Speedtronic Mark IV turbine control system. It provides 16 latching relay outputs with mechanical flag indicators, serving as the interface between the Mark IV processor and field actuators (solenoids, valves, contactors). The “1B1A” suffix indicates a specific revision with upgraded surge suppression, extended temperature range, and improved backplane isolation compared to base models.
The GE DS3800DRFA is a Digital Relay and Flag board designed for the GE Speedtronic Mark IV turbine control system. Unlike the power supply boards we previously discussed, this board serves as the output interface between the Mark IV processor and the turbine’s field actuators, solenoids, and annunciator panels. It provides latching relay outputs for critical trip functions and visual indication (flags) for operator alarms. The “DRFA” designation indicates a specific relay configuration with Form C contacts and enhanced surge suppression for inductive loads.
The GE DS3800DPSS1C1C is a Power Supply and Analog Signal Conditioning board for the GE Speedtronic Mark IV turbine control system. It converts raw 125VDC or 120VAC plant power into regulated DC voltages (+5V, +15V, -15V, +24V) and conditions 16 differential analog inputs for thermocouples, RTDs, and 4-20mA transmitters. The “1C1C” revision features improved switching regulators, expanded thermocouple support (Types R & S), and enhanced noise filtering.
The GE DS3800DPSS1B1B is a hybrid Power Supply and Analog Signal Conditioning board engineered specifically for the Mark IV series, but this particular revision includes enhanced filtering components and a modified backplane connector pinout compared to earlier “A” revisions. The board functions as the central power distribution hub and analog front-end, converting raw 125VDC or 120VAC plant power into multiple regulated, isolated DC voltages for other Mark IV boards (processor, servo drivers, digital I/O).
Additionally, the GE DS3800DPSS1B1B integrates 16 differential analog input channels that condition thermocouple, RTD, and 4-20mA transmitter signals. The “1B1B” designation indicates that this board features upgraded isolation transformers, tighter-tolerance resistor networks (0.01% instead of 0.1%), and a revised jumper configuration for the cold-junction compensation circuit. This makes the GE DS3800DPSS1B1B the preferred choice for applications requiring exceptionally high measurement accuracy, such as exhaust gas temperature (EGT) spread monitoring, where a 1°C error can significantly impact turbine firing temperature control.