GE DS3800XPEX1B1A

Key Parameters

• Power Outputs: Multiple regulated DC outputs (+5V, ±15V, +24V, and additional auxiliary outputs)

• Excitation Outputs: Adjustable excitation for transducers (e.g., 3V, 5V, 10V DC, or 4–20mA loop power)

• Input Voltage: 120/240V AC or 125/250V DC (depending on system configuration)

• Output Accuracy: ±0.05% regulation

• Ripple/Noise: <3 mV peak-to-peak

• Current Capacity: Significantly higher than standard boards (consult board marking; supports multiple high-current sensors)

• Isolation: 2500V RMS input-to-output

• Diagnostics: LED status indicators for each output, over-voltage/over-current protection, thermal shutdown, output voltage monitoring, thermal monitoring, enhanced fault logging (firmware 1B1A) , self-test on power-up, refined diagnostic detail over 1A1A

• Thermal Management: Enhanced heatsinking and airflow design

• Temp Range: –40°C to +85°C (extended)

• Physical: 6U VME single-slot board (with enhanced heatsink)

• Key Features: High current capacity, additional output channels, enhanced thermal management, ultra-low noise (<3 mV), extended temp range, advanced diagnostics, self-test, firmware rev 1B1A

Advantages

• High current capacity – the DS3800XPEX1B1A can supply significantly more current than standard boards, supporting multiple sensors, long cable runs, or high-power transducers.

• Additional output channels – provides more auxiliary outputs than standard boards, reducing the need for external power supplies.

• Ultra-low noise – <3 mV ripple provides exceptionally clean power for sensitive analog measurements.

• Enhanced thermal management – improved heatsinking and thermal design ensure reliable operation under high-load conditions.

• Extended temperature range – operates from –40°C to +85°C for harsh environments.

• Enhanced diagnostics – the 1B1A firmware provides refined diagnostic reporting over the 1A1A variant, with improved fault logging and self-test for predictive maintenance.

• Thermal monitoring – alerts the system to overheating conditions, enabling proactive cooling or load reduction.

• Comprehensive protection – over-voltage, over-current, and thermal protection safeguard the General Electric DS3800XPEX1B1A and connected field devices.

• Drop-in compatible – works with all Mark IV backplanes and processor configurations.

Applications

• Multiple sensor installations – powers numerous speed pickups, proximity probes, and LVDTs from a single board.

• Long cable runs – the high current capacity of the DS3800XPEX1B1A compensates for voltage drop in long sensor cables.

• High-power transducers – supplies excitation to transducers requiring higher current than standard boards can provide.

• Large turbine systems – provides power for sensors across multiple turbine sections (gas turbine, steam turbine, generator).

• Offshore and harsh environments – extended temperature range and enhanced diagnostics make it suitable for demanding applications.

• Retrofits – the DS3800XPEX1B1A replaces multiple standard power boards with a single high-capacity unit.

vs Competitors & Previous Variants

Selection Tips

• High power / multiple sensors – choose the DS3800XPEX1B1A when you need to power many sensors or high-power transducers from a single board, combined with the latest diagnostics and extended temperature range.

• Latest firmware – the 1B1A firmware provides refined diagnostic reporting over the 1A1A variant, making it ideal for facilities with proactive maintenance programs.

• Long cable runs – the higher current capacity of the General Electric DS3800XPEX1B1A allows compensation for voltage drop in long cables; calculate the required current based on cable length and sensor load.

• Additional outputs – if your system requires more auxiliary voltages than standard boards provide, the DS3800XPEX1B1A offers additional outputs.

• Harsh environments – the extended temperature range makes it suitable for offshore, desert, or unheated cabinet installations.

• Sensor compatibility – verify that the excitation voltage and current requirements of your sensors match the DS3800XPEX1B1A outputs.

• Power loading – calculate the total current draw of all connected sensors and ensure it does not exceed the DS3800XPEX1B1A total power rating.

• Firmware compatibility – confirm your Mark IV main processor firmware supports the enhanced diagnostic features of the DS3800XPEX1B1A.

• Spare strategy – keep one DS3800XPEX1B1A per 5–8 installed units, especially in sensor-rich or critical installations.

Critical Precautions

• Power loading – do not exceed the DS3800XPEX1B1A total power rating. Overloading can cause voltage drop, overheating, or thermal shutdown.

• Thermal considerations – the DS3800XPEX1B1A generates significant heat under high-load conditions. Ensure adequate cabinet cooling (>250 CFM) and unobstructed airflow over the heatsink.

• Output voltage selection – verify that output voltages are correctly configured before connecting sensors. Incorrect voltage can damage sensors.

• Wiring polarity – ensure correct polarity when connecting sensors to the General Electric DS3800XPEX1B1A outputs; reversed polarity can damage sensitive transducers.

• Shielded cabling – use shielded cables for sensor connections to minimize noise pickup. Ground the shield only at the DS3800XPEX1B1A end to prevent ground loops.

• Ground loops – use single-point grounding for all sensors connected to the DS3800XPEX1B1A to avoid ground-loop noise.

• Cable sizing – for long cable runs, ensure that the cable gauge is sufficient to handle the current without excessive voltage drop; consult the DS3800XPEX1B1A technical manual for derating guidelines.

• Thermal monitoring – if thermal monitoring outputs are available, connect them to the Mark IV system for continuous temperature monitoring.

• Self-test – allow the DS3800XPEX1B1A to complete its power-up self-test (~2 seconds) before relying on outputs.

• Hot-swap – never insert or remove the DS3800XPEX1B1A while the rack is powered; this can cause voltage spikes and damage connected sensors.

• ESD handling – always use a grounded wrist strap when handling the DS3800XPEX1B1A; power components are ESD-sensitive.

• Storage – store spare DS3800XPEX1B1A boards in anti-static bags in a dry, temperature-controlled environment.