Description
Key Technical Specifications
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Model Number: 4D33900G19
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Manufacturer: Emerson (formerly Westinghouse)
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Input Voltage: 85–264 VAC (47–63 Hz, single-phase)
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Input Power: Max 663 W (calculated from output ratings)
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Output 1: 24 VDC, 300 W max (12.5 A continuous)
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Output 2: 24 VDC, 200 W max (8.3 A continuous)
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Isolation: Galvanic isolation between input and outputs (protects downstream components from voltage spikes)
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Efficiency: 89–94% (high efficiency reduces heat dissipation)
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Operating Temperature: –40°C to +70°C (IEC 60068-2 compliant, suitable for harsh industrial environments)
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Storage Temperature: –40°C to +85°C
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Humidity Range: 5–95% RH (non-condensing)
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Mounting: DIN rail compatible (per IEC 60715) or panel mount
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Dimensions: 124 mm (W) × 125 mm (H) × 115 mm (D) (approximate, varies by manufacturer)
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Weight: ~3.62 kg (7.99 lbs, typical for industrial power supplies)
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Certifications: CE, RoHS (compliant with international safety and environmental standards)
4D33900G19
Field Application & Problem Solved
In industrial automation—from power plants to chemical refineries—control systems rely on stable DC power to operate field devices (e.g., sensors, actuators) and I/O modules. The biggest challenge with legacy power supplies is finding a solution that balances high power density (to minimize cabinet space) with reliability (to withstand harsh environments). Cheap or poorly designed power supplies often fail due to voltage fluctuations, overheating, or lack of isolation—leading to system downtime and equipment damage.
The 4D33900G19 solves this by providing dual 24VDC outputs (total 500W) with galvanic isolation. You’ll find it in:
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Power generation: Powering Ovation I/O modules for boiler temperature/pressure monitoring and turbine control.
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Chemical/petrochemical: Supplying power to valve positioners, flow meters, and other field devices in hazardous locations.
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Water treatment: Providing stable power to pump controllers, level sensors, and filtration systems.
Its core value is reliability in mission-critical applications. The galvanic isolation prevents voltage spikes from the input (e.g., from nearby motors) from damaging downstream components—something we learned the hard way in a refinery where a non-isolated power supply caused a cascade failure of I/O modules. The high efficiency also reduces heat dissipation, which is critical for 24/7 operations like power plants, where overheating can cause power supply failures.
Installation & Maintenance Pitfalls (Expert Tips)
1. Ignoring Input Voltage Range
A common rookie mistake is connecting the power supply to a voltage outside the 85–264 VAC range. This can damage the input rectifier or capacitors. Always verify the input voltage with a multimeter before plugging in—we once had a client fry a power supply by connecting it to a 277 VAC circuit.
2. Poor Ventilation
The 4D33900G19 generates heat during operation—if the cabinet is not well-ventilated, the power supply can overheat and shut down. Always leave at least 10 cm (4 inches) of clearance around the power supply for airflow. We fixed a recurring power supply failure in a paper mill by adding a fan to the cabinet.
3. Overloading Outputs
The 300W and 200W outputs are rated for continuous load—don’t exceed these limits. Overloading can cause the power supply to shut down or damage the output transistors. Always calculate the total load of all devices connected to each output—if it exceeds the rating, use a separate power supply. We once had a client overload an output by 50W—this caused the power supply to fail, leading to a 6-hour downtime in a power plant.
4. Skipping Isolation Testing
Before connecting the power supply to downstream components, verify input-to-output isolation with a megger (insulation tester). The 4D33900G19’s isolation is rated for 1500V AC—if you get a lower reading, the power supply may be damaged. We once had a batch of power supplies with faulty isolation that caused ground loops in a chemical plant’s DCS.
4D33900G19
Technical Deep Dive & Overview
The 4D33900G19 is an auxiliary power supply module designed exclusively for Emerson’s Ovation Distributed Control System (DCS). It acts as a bridge between the AC mains (85–264 VAC) and the DC-powered components of the Ovation system (I/O modules, controllers, field devices). Here’s how it works:
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Input Rectification: The AC input is converted to DC using a bridge rectifier.
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Power Factor Correction (PFC): The PFC circuit improves efficiency by reducing harmonic distortion.
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DC-DC Conversion: The DC voltage is converted to two 24VDC outputs using switching regulators.
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Isolation: Galvanic isolation (via transformers) separates the input from the outputs, protecting downstream components from voltage spikes.
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Monitoring: The power supply includes built-in diagnostics (e.g., overvoltage, overcurrent protection) to alert users of faults.
What sets the 4D33900G19 apart is its compatibility and ruggedness. It works with all Ovation I/O modules and controllers, so you can use it in new or existing systems. The polycarbonate housing is resistant to chemicals and moisture, making it ideal for harsh environments like refineries or paper mills.
Another key feature is hot-swapping. The power supply can be replaced without shutting down the system, which is critical for 24/7 operations like power plants. The dual outputs also provide redundancy—if one output fails, the other can continue to power critical devices.
Final Notes
The 4D33900G19 is a workhorse power supply for Ovation DCS systems. Its combination of dual outputs, galvanic isolation, and rugged design makes it ideal for mission-critical applications where reliability is non-negotiable. Whether you’re upgrading a legacy system or building a new one, this power supply will provide the stable DC power you need—just remember to follow the installation tips to avoid common pitfalls.
