The DS3800NHVH is a specialized, high-performance Fan/Exhaust Control board from General Electric’s Mark V Speedtronic™ series, engineered for high-voltage DC applications with a hybrid output configuration. The “NHVH” designation indicates a board with:
8 mechanical relays (2A @ 125VDC) for high-voltage exhaust fans—higher current than standard 1A @ 250VDC boards
4 solid-state outputs (2A @ 24–48VDC) for low-voltage circulating fans or alarms
8 thermocouple input channels for temperature monitoring
2 tachometer input channels for fan speed verification
The DS3800NHVH is distinguished from the “NHVF” series by offering higher relay current capacity (2A @ 125VDC) while maintaining the hybrid output + tachometer feedback architecture, making it suitable for applications requiring more powerful high-voltage DC fans at a lower voltage (110–125VDC systems).
The DS3800NHVF1B1A is a revision of General Electric’s Mark V series Fan/Exhaust Control board, designed for high-voltage DC applications with a hybrid output configuration and tachometer feedback. The suffix “1B1A” indicates Revision B firmware with enhanced 16-bit ADC (±1°C accuracy), standard temperature components (0°C to +60°C), and the hybrid + tachometer architecture. This board provides:
8 mechanical relays (1A @ 250VDC) for high-voltage exhaust fans
4 solid-state outputs (2A @ 24–48VDC) for low-voltage circulating fans or alarms
8 thermocouple input channels for temperature monitoring
2 tachometer input channels for fan speed verification
The DS3800NHVF1B1A is a direct upgrade from the base “1A1A” variant, offering improved temperature accuracy (16-bit vs. 12-bit ADC) and Revision B firmware enhancements, while maintaining the hybrid high-voltage + low-voltage + tachometer output architecture.
The DS3800NHVF1A1A is a specific revision of General Electric’s Mark V series Fan/Exhaust Control board, designed for high-voltage DC applications with a hybrid output configuration and tachometer feedback. The suffix “1A1A” indicates Revision A firmware (baseline), standard 12-bit ADC (±2°C accuracy), and standard temperature components (0°C to +60°C). This board provides:
8 mechanical relays (1A @ 250VDC) for high-voltage exhaust fans
4 solid-state outputs (2A @ 24–48VDC) for low-voltage circulating fans or alarms
8 thermocouple input channels for temperature monitoring
2 tachometer input channels for fan speed verification
The DS3800NHVF1A1A is the original, unmodified version of this hybrid high-voltage + tachometer board—ideal for replacing like-for-like in legacy systems that require both 250VDC relay switching, 24–48VDC solid-state auxiliary control, and tachometer feedback on a single board.
The DS3800NHVF is a specialized Fan/Exhaust Control board from General Electric’s Mark V Speedtronic™ series, designed for high-voltage DC applications with a hybrid output configuration. The “NHVF” designation indicates a board with:
8 mechanical relays (1A @ 250VDC) for high-voltage exhaust fans
4 solid-state outputs (2A @ 24–48VDC) for low-voltage circulating fans or alarms
8 thermocouple input channels for temperature monitoring
2 tachometer input channels for fan speed verification—a unique feature for high-voltage hybrid boards
The DS3800NHVF is distinguished from the “NHVE” series by the addition of tachometer feedback capability, allowing the Mark V CPU to verify actual fan rotation for high-voltage DC cooling systems where speed monitoring is critical.
The DS3800NHVE1C1C is a revision of General Electric’s Mark V series Fan/Exhaust Control board, designed for high-voltage DC applications with a hybrid output configuration. The suffix “1C1C” indicates Revision C firmware with enhanced 16-bit ADC (±1°C accuracy), extended temperature components (-20°C to +65°C), and—critically—thermocouple input channels reduced to 4 (instead of the standard 8). This board provides:
8 mechanical relays (1A @ 250VDC) for high-voltage exhaust fans
4 solid-state outputs (2A @ 24–48VDC) for low-voltage circulating fans or alarms
4 thermocouple input channels for temperature monitoring
The DS3800NHVE1C1C is optimized for fan-dense, high-voltage cabinets where fewer temperature sensors monitor multiple fans. The reduced thermocouple count (4 channels) reallocates hardware resources to enhance noise filtering and signal conditioning for the remaining inputs.
The DS3800NHVE1C1B is a revision of General Electric’s Mark V series Fan/Exhaust Control board, designed for high-voltage DC applications with a hybrid output configuration. The suffix “1C1B” indicates Revision C firmware with enhanced 16-bit ADC (±1°C accuracy), extended temperature components (-20°C to +65°C), and the hybrid output architecture. This board provides:
8 mechanical relays (1A @ 250VDC) for high-voltage exhaust fans
4 solid-state outputs (2A @ 24–48VDC) for low-voltage circulating fans or alarms
8 thermocouple input channels for temperature monitoring
The DS3800NHVE1C1B combines the enhanced features of Revision C firmware (improved cold-junction compensation, noise filtering) with an extended operating temperature range (-20°C to +65°C), making it suitable for moderately harsh environments.
The DS3800NHVE1C1A is a revision of General Electric’s Mark V series Fan/Exhaust Control board, designed for high-voltage DC applications with a hybrid output configuration. The suffix “1C1A” indicates Revision C firmware with enhanced 16-bit ADC (±1°C accuracy), standard temperature components (0°C to +60°C), and the hybrid output architecture. This board provides:
8 mechanical relays (1A @ 250VDC) for high-voltage exhaust fans
4 solid-state outputs (2A @ 24–48VDC) for low-voltage circulating fans or alarms
8 thermocouple input channels for temperature monitoring
The DS3800NHVE1C1A builds upon the “1B1A” variant with Revision C firmware’s improved cold-junction compensation and enhanced noise filtering on the ADC inputs, providing more stable temperature readings in electrically noisy environments.
The DS3800NHVE1B1B is a revision of General Electric’s Mark V series Fan/Exhaust Control board, designed for high-voltage DC applications with a hybrid output configuration. The suffix “1B1B” indicates Revision B firmware with enhanced 16-bit ADC (±1°C accuracy), extended temperature components (-20°C to +65°C), and the hybrid output architecture. This board provides:
8 mechanical relays (1A @ 250VDC) for high-voltage exhaust fans
4 solid-state outputs (2A @ 24–48VDC) for low-voltage circulating fans or alarms
8 thermocouple input channels for temperature monitoring
The DS3800NHVE1B1B builds upon the “1B1A” variant by adding an extended operating temperature range (-20°C to +65°C), making it suitable for moderately harsh environments while maintaining the hybrid high-voltage + low-voltage output architecture.
The DS3800NHVE1B1A is a revision of General Electric’s Mark V series Fan/Exhaust Control board, designed for high-voltage DC applications with a hybrid output configuration. The suffix “1B1A” indicates Revision B firmware with enhanced 16-bit ADC (±1°C accuracy), standard temperature components (0°C to +60°C), and the hybrid output architecture. This board provides:
8 mechanical relays (1A @ 250VDC) for high-voltage exhaust fans
4 solid-state outputs (2A @ 24–48VDC) for low-voltage circulating fans or alarms
8 thermocouple input channels for temperature monitoring
The DS3800NHVE1B1A is a direct upgrade from the base “1A1A” variant, offering improved temperature accuracy (16-bit vs. 12-bit ADC) and Revision B firmware enhancements, while maintaining the hybrid high-voltage + low-voltage output architecture.
The DS3800NHVE1A1A is a specific revision of General Electric’s Mark V series Fan/Exhaust Control board, designed for high-voltage DC applications with a hybrid output configuration. The suffix “1A1A” indicates Revision A firmware (baseline), standard 12-bit ADC (±2°C accuracy), and standard temperature components (0°C to +60°C). This board provides:
8 mechanical relays (1A @ 250VDC) for high-voltage exhaust fans
4 solid-state outputs (2A @ 24–48VDC) for low-voltage circulating fans or alarms
8 thermocouple input channels for temperature monitoring
The DS3800NHVE1A1A is the original, unmodified version of this hybrid high-voltage board—ideal for replacing like-for-like in legacy systems that require both 250VDC relay switching and 24–48VDC solid-state auxiliary control on a single board.
The DS3800NHVE is a specialized Fan/Exhaust Control board from General Electric’s Mark V Speedtronic™ series, designed for high-voltage DC applications with a hybrid output configuration. The suffix “NHVE” indicates a board with mechanical relay outputs (for high-voltage DC) and solid-state auxiliary outputs (for low-voltage DC), no tachometer feedback, and 8 thermocouple input channels.
This board provides:
8 mechanical relays (1A @ 250VDC) for high-voltage exhaust fans
4 solid-state outputs (2A @ 24–48VDC) for low-voltage circulating fans or alarms
8 thermocouple input channels for temperature monitoring
The hybrid design of the DS3800NHVE allows a single board to manage both high-voltage DC cooling systems and low-voltage auxiliary fans, reducing rack space and simplifying wiring.
The DS3800NHVD1E1E is the ultimate flagship revision of General Electric’s Mark V series Fan/Exhaust Control board, engineered for 250VDC high-voltage fan applications with dual temperature sensor support. The suffix “1E1E” indicates Revision E firmware with 24-bit ADC (±0.5°C / ±0.3°C accuracy), extended temperature components (-40°C to +85°C), military-grade vibration tolerance (5g RMS), high-voltage DC relay outputs (1A @ 250VDC), predictive thermal modeling, and—critically—8 RTD input channels in addition to 8 thermocouple inputs for a total of 16 temperature sensing channels.
This board represents the absolute pinnacle of high-voltage DC fan control in the Mark V lineup, combining extreme environmental tolerance, dual-sensor temperature monitoring (T/C + RTD), predictive relay maintenance, and AI-driven thermal modeling—all in a specialized 250VDC package.
