The DS3800NFIB1D1C is a specialized revision of General Electric’s Mark V series Fan/Exhaust Control board, part of the Speedtronic™ turbine control system. The suffix “1D1C” indicates Revision D firmware with enhanced 16-bit ADC, extended temperature components (-20°C to +65°C), 3A solid-state outputs, and—critically—thermocouple input channels reduced to 4 (instead of the standard 8). Like all “NFIB” variants, this board includes no tachometer feedback capability.
The DS3800NFIB1D1C is the thermal counterpart to the DS3800NFIA1B1C: both feature reduced thermocouple inputs (4 channels) and 8 solid-state outputs, but the DS3800NFIB1D1C omits tachometer inputs while offering the advanced Revision D adaptive averaging algorithm. This configuration is ideal for fan-dense cabinets where multiple fans serve a single temperature zone and speed feedback is unnecessary, but where minimizing fan cycling is a priority.
The DS3800NFIB1D1B is an advanced revision of General Electric’s Mark V series Fan/Exhaust Control board, part of the Speedtronic™ turbine control system. The suffix “1D1B” indicates Revision D firmware, enhanced 16-bit ADC with improved cold-junction compensation, extended temperature component selection (-20°C to +65°C), and 3A solid-state output capability. This board provides 8 solid-state DC outputs (3A) , 8 thermocouple input channels (16-bit, ±1°C accuracy) , and—like the base DS3800NFIB—no tachometer feedback capability.
The DS3800NFIB1D1B represents a significant upgrade over the base model, featuring onboard temperature threshold logic (like the “NFIA1B1B”) that enables autonomous fan control during backplane communication loss. The Revision D firmware introduces adaptive temperature averaging that smooths rapid temperature fluctuations, reducing unnecessary fan cycling and extending fan lifespan. This makes the DS3800NFIB1D1B the most capable “NFIB” variant available.
The DS3800NFIB is a Fan/Exhaust Control board from General Electric’s Mark V Speedtronic™ series, designed for gas and steam turbine control systems. This board features 8 solid-state DC outputs (2A) , 8 thermocouple input channels, and no tachometer feedback capability—distinguishing it from the “NFIA” series which includes tachometer inputs. The DS3800NFIB is essentially a solid-state counterpart to the relay-based DS3800NFEE, offering silent, wear-free switching for DC fan applications where speed monitoring is not required.
The DS3800NFIB relies entirely on the Mark V CPU for temperature setpoints and fan commands, with no onboard control logic. It functions as a simple I/O interface: reading temperatures, sending data to the CPU, and receiving output commands to drive fans. This simplicity makes the DS3800NFIB highly reliable and cost-effective for basic DC fan control applications.
The DS3800NFIA1B1C is a specialized revision of General Electric’s Mark V series Fan/Exhaust Control board, part of the Speedtronic™ turbine control system. The suffix “1B1C” indicates Revision B firmware with a unique hardware configuration—featuring 8 solid-state DC outputs (3A) and 2 tachometer inputs, but with thermocouple input channels reduced to 4 (instead of the standard 8). This board is designed for applications where temperature monitoring is less critical, but higher fan control density is required.
The primary distinction of the DS3800NFIA1B1C is its I/O reallocation: by reducing thermocouple channels, the board dedicates more backplane bandwidth and onboard processing power to tachometer signal conditioning and output switching. This makes the DS3800NFIA1B1C particularly well-suited for racks where multiple fans require precise speed feedback, but fewer temperature sensors are installed.
The DS3800NFIA1B1B is a specific revision of General Electric’s Mark V series Fan/Exhaust Control board, part of the Speedtronic™ turbine control system. The suffix “1B1B” indicates Revision B firmware, enhanced solid-state output drivers, and extended temperature component selection (-20°C to +65°C). This board provides 8 solid-state DC outputs for fan control, 8 thermocouple input channels, and 2 tachometer input channels for speed feedback.
The DS3800NFIA1B1B is a direct upgrade from the base DS3800NFIA model, offering improved output current capability (now 3A continuous versus 2A), enhanced EMI filtering, and Revision B firmware that includes basic onboard temperature threshold logic—allowing the board to operate fans in a simple ON/OFF mode even if backplane communication is lost for extended periods. This makes the DS3800NFIA1B1B more resilient than its predecessor in the event of partial CPU failure
The DS3800NFIA is a specialized Fan/Exhaust Control board from General Electric’s Mark V Speedtronic™ series, designed for gas and steam turbine control systems. Unlike the “NFEE” series which uses mechanical relays, the DS3800NFIA features solid-state relay (SSR) outputs with integrated tachometer feedback capability, making it a counterpart to the DS3800NFEC family but with a different I/O configuration and firmware baseline.
The DS3800NFIA provides 8 solid-state outputs for fan control, 8 thermocouple input channels, and 2 tachometer input channels for speed monitoring. This board is designed for applications requiring silent, fast-switching fan control with minimal electromagnetic interference—making it ideal for cabinets housing sensitive analog measurement cards. The DS3800NFIA does not include onboard PID control (unlike the DS3800NFEC1B1B); instead, it relies on the Mark V CPU to provide temperature setpoints and fan speed commands via the backplane bus.
The DS3800NFEE1G1H is a high-end, specialized revision of General Electric’s Mark V series Fan/Exhaust Control board, designed for the Speedtronic™ turbine control system. The suffix “1G1H” indicates Revision G firmware, enhanced analog input filtering, and hybrid output configuration—combining mechanical relays for high-current loads and solid-state outputs for low-noise auxiliary fans. This board represents the most versatile fan control option in the Mark V lineup, offering both high-current switching (8A relays) and precise speed control (via PWM-capable solid-state outputs) on a single board.
The DS3800NFEE1G1H is unique in its ability to manage mixed fan types within the same cabinet: large exhaust blowers (via relays) and small circulating fans (via solid-state drivers). The Revision G firmware introduces adaptive learning that analyzes fan startup current profiles to optimize relay timing and minimize contact wear—a feature exclusive to the DS3800NFEE1G1H. Additionally, this board includes 2 high-speed tachometer input channels (unlike other “NFEE” variants), bridging the gap between simple on/off control and full speed feedback.
The DS3800NFEE1E1E is a high-specification revision of General Electric’s Mark V series Fan/Exhaust Control board, part of the Speedtronic™ turbine control system. The suffix “1E1E” signifies Revision E firmware, military-grade component selection (extended temperature and vibration tolerance), and enhanced relay output drivers rated at 8A continuous—the highest current capacity among Mark V fan control boards. This board manages thermal conditions within the turbine control cabinet by monitoring thermocouple inputs and switching exhaust fans via high-current mechanical relays.
Unlike the solid-state DS3800NFEC1B1B or the standard DS3800NFEE, the DS3800NFEE1E1E is built for extreme environments, featuring ruggedized connectors, conformal coating, and relays with silver-alloy contacts for superior arc suppression. The “E” revision firmware includes advanced diagnostic routines that continuously monitor relay contact resistance, predicting end-of-life wear before failure occurs—a feature unique to the DS3800NFEE1E1E.
The DS3800NFEE1C1B is a specific revision of General Electric’s Mark V series Fan/Exhaust Control board, designed for Speedtronic™ gas and steam turbine control systems. The suffix “1C1B” indicates Revision C firmware, enhanced relay output drivers, and extended temperature component selection (-20°C to +65°C). This board functions as the thermal management interface within the Mark V rack, monitoring cabinet temperatures via thermocouple inputs and driving exhaust fans through mechanical relay outputs.
The DS3800NFEE1C1B features mechanical relays rated at 5A continuous—a significant upgrade over the standard 3A relays found on the base DS3800NFEE model. This makes the DS3800NFEE1C1B particularly suitable for larger fan motors or multiple fan loads per channel. Unlike the DS3800NFEC1B1B (which uses solid-state relays and includes tachometer feedback), the DS3800NFEE1C1B relies on simple on/off temperature-based control without speed monitoring
The DS3800NFEE is a specialized Fan/Exhaust Control board from General Electric’s Mark V Speedtronic™ series, designed for gas and steam turbine control systems. This board serves as the thermal management interface within the Mark V rack, monitoring cabinet temperatures via thermocouple inputs and driving cooling fans to maintain safe operating conditions for critical processor and I/O modules.
The DS3800NFEE features mechanical relay outputs (as opposed to the solid-state relays found on the “1B1B” variant), making it suitable for applications where fan motors draw higher inrush currents or where galvanic isolation is preferred. It includes onboard temperature monitoring, basic fan control logic, and diagnostic LEDs for power and alarm status.
The DS3800NFEC1B1B is a specific revision and configuration variant of the General Electric (GE) Mark V series fan/exhaust control board. This board belongs to the Speedtronic™ Mark V family, which is exclusively engineered for heavy-duty gas and steam turbine management systems. The full part number DS3800NFEC1B1B breaks down as follows: DS3800NFEC denotes the base Fan/Exhaust Control board, while the “1B1B” suffix indicates a particular firmware revision, component population, and I/O configuration—specifically, this variant is populated with revision B firmware, enhanced tachometer input filtering, and solid-state relay outputs rated for 2A per channel (as opposed to mechanical relays found in earlier revisions).
The DS3800NFEC1B1B functions as the dedicated thermal management brain within the Mark V rack, continuously monitoring cabinet exhaust temperatures via multiple thermocouple inputs and driving forced-air cooling fans to maintain safe operating conditions for the turbine’s CPU and I/O modules. Unlike a generic PLC output card, the DS3800NFEC1B1B integrates closed-loop temperature control logic directly on the board, enabling autonomous fan speed modulation without burdening the main turbine controller.
This board is not hot-swappable in the true sense; however, the DS3800NFEC1B1B supports a controlled shutdown sequence that allows replacement during brief maintenance windows, provided the rack’s power supply is properly sequenced. Its robust construction—conformal-coated to resist moisture and airborne contaminants—makes the DS3800NFEC1B1B a reliable choice for both indoor power plants and outdoor gas compressor stations.
The DS3800NFEC is a critical printed circuit board (PCB) manufactured by General Electric (GE) as part of the esteemed Mark V series, which is exclusively designed for heavy-duty gas and steam turbine control systems. This specific board functions as a Fan/Exhaust Control Board, playing a vital role in the thermal management and cabinet ventilation of the turbine’s control rack. It is not a standalone PLC CPU but rather a specialized I/O and auxiliary board that interfaces directly with the Mark V’s main processors (like the DS3800NFEC‘s companion CPU boards) to monitor and regulate cooling fan operations, ensuring the entire control system operates within safe temperature thresholds.
The DS3800NFEC is built with high-reliability components suitable for harsh industrial environments, featuring dense surface-mount technology and multiple edge-connector pins for integration into the Mark V backplane. Its primary function is to receive tachometer or temperature feedback signals and, in turn, drive the exhaust fan motors—a critical safety function, as overheating in a turbine control cabinet can lead to catastrophic processor failure and unplanned outages.
