GE DS3800XPEN

Key Parameters

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

• Ripple/Noise: <3 mV peak-to-peak (improved)

• Current Capacity: Higher than standard boards (per output, consult board marking)

• Isolation: 2500V RMS input-to-output

• Diagnostics: LED status indicators for each output, over-voltage/over-current protection, thermal shutdown, output voltage monitoring

• Temp Range: –30°C to +70°C

• Physical: 6U VME single-slot board

• Key Features: Multiple regulated outputs, adjustable excitation, low noise (<3 mV), higher current capacity, short-circuit protection, thermal shutdown, output voltage monitoring

Advantages

• Superior regulation – ±0.05% output regulation ensures stable excitation even under varying load conditions, critical for high-precision sensors.

• Ultra-low noise – <3 mV ripple provides exceptionally clean power for sensitive analog measurements, improving signal-to-noise ratio.

• Higher current capacity – the DS3800XPEN can supply more current than standard boards, supporting multiple sensors or long cable runs.

• Adjustable excitation – allows matching excitation levels to specific sensor requirements.

• Output voltage monitoring – the General Electric DS3800XPEN includes monitoring circuits that alert the system to output voltage deviations.

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

• Diagnostic visibility – LED indicators and monitoring outputs simplify troubleshooting of power supply issues.

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

Applications

• Speed pickup excitation – provides stable power to magnetic pickups for turbine speed measurement and overspeed protection.

• Proximity probe excitation – supplies low-noise power to eddy-current probes for shaft vibration and position monitoring.

• LVDT excitation – powers LVDTs for precise valve position feedback (IGVs, fuel valves, steam valves).

• Pressure transmitter power – provides loop power for 2-wire 4–20mA pressure transmitters.

• RTD excitation – supplies constant current for RTD temperature measurement.

• Long cable runs – the higher current capacity of the DS3800XPEN compensates for voltage drop in long sensor cables.

• Retrofits – the DS3800XPEN replaces aging power supply modules in legacy Mark IV systems with improved performance.

vs Competitors & Previous Variants

Selection Tips

• High-precision sensors – choose the DS3800XPEN for applications requiring the lowest noise and tightest regulation (e.g., vibration monitoring, precision speed control).

• Multiple sensors / long cables – the higher current capacity makes the General Electric DS3800XPEN suitable for powering multiple sensors or installations with long cable runs.

• Sensor compatibility – verify that the excitation voltage and current requirements of your sensors match the DS3800XPEN outputs.

• Output configuration – ensure that the jumpers or DIP switches on the DS3800XPEN are set correctly for your required output voltages.

• Power loading – calculate the total current draw of all connected sensors and ensure it does not exceed the DS3800XPEN total power rating.

• Spare strategy – keep one DS3800XPEN per 5–8 installed units, especially in critical measurement applications.

• Calibration – periodically verify output voltages under load using a precision multimeter to ensure the ±0.05% accuracy.

Critical Precautions

• Output voltage selection – verify that the DS3800XPEN output voltages are correctly configured before connecting sensors. Incorrect voltage can damage sensors.

• Overloading – do not exceed the DS3800XPEN current rating for any output. Overloading can cause voltage drop, overheating, or shutdown.

• Wiring polarity – ensure correct polarity when connecting sensors to the General Electric DS3800XPEN 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 DS3800XPEN end to prevent ground loops.

• Ground loops – use single-point grounding for all sensors connected to the DS3800XPEN to avoid ground-loop noise that can affect measurements.

• Output monitoring – if the DS3800XPEN includes monitoring outputs, connect them to the appropriate analog inputs for continuous voltage verification.

• Thermal considerations – ensure adequate cabinet cooling; the DS3800XPEN can generate significant heat under load, especially at higher current outputs.

• Hot-swap – never insert or remove the DS3800XPEN 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 DS3800XPEN; power components are ESD-sensitive.

• Ripple check – if measurement noise issues arise, check the DS3800XPEN output ripple with an oscilloscope; excessive ripple may indicate failing capacitors.

• Storage – store spare DS3800XPEN boards in anti-static bags in a dry, temperature-controlled environment.