Description
System Role and Integration
The 1X00781H01L serves as the primary auxiliary power source within the Ovation Distributed Control System architecture, functioning as the critical infrastructure component that converts facility AC or DC power into the regulated 24VDC required by control system electronics. As a DIN-rail mountable power supply, it installs in standard industrial control cabinets and provides the stable, clean power necessary for reliable operation of Ovation controllers, I/O modules, and field instrumentation.
This module occupies a foundational position in the Ovation power hierarchy, operating downstream of the main cabinet circuit breakers and upstream of the specific control components. Unlike the main controller power supplies that provide specific voltages for processor operation, the 1X00781H01L delivers general-purpose 24VDC auxiliary power for I/O loop excitation, relay coil driving, contact wetting, and field device power. Its universal input capability eliminates the need for separate voltage-specific models, simplifying spare parts management for multinational facilities.
Core Functionality and Signal Handling
The module accepts a wide-range input from 85 to 264 volts AC (47-63 Hz) or 90 to 375 volts DC, accommodating both North American 120/240VAC and international 220-240VAC standards, as well as DC battery systems commonly found in power generation and substation applications. This universal input capability allows the same part number to serve diverse electrical infrastructures without hardware configuration changes.
Internally, the power supply utilizes high-frequency switching technology with active power factor correction (PFC) to achieve efficiency ratings up to 95%, minimizing heat generation and reducing energy consumption compared to linear power supplies. The 24VDC output provides 10 amps continuous current (240 watts) with low ripple and noise characteristics essential for sensitive analog I/O measurements and digital logic circuits.
Protection features include overcurrent limiting, short-circuit protection with automatic recovery, overvoltage shutdown, and thermal protection with derating. The conformal-coated printed circuit boards provide moisture and contaminant resistance for harsh industrial environments. The fanless design eliminates moving parts, significantly improving mean time between failures (MTBF) and reducing maintenance requirements compared to forced-air cooled alternatives.
Platform Heritage and Operational Benefits
As a component of the Emerson Ovation platform originally developed by Westinghouse, the 1X00781H01L reflects the industrial power supply design philosophy emphasizing reliability, efficiency, and wide environmental tolerance. The module is engineered for continuous duty in mission-critical applications where power supply failure could result in costly process shutdowns or safety incidents.
The DIN-rail mounting configuration facilitates rapid installation and replacement in standard 35mm industrial rails without requiring specialized tools or mounting hardware. The compact form factor (approximately 140mm × 140mm × 40mm) optimizes space utilization in crowded control cabinets, allowing multiple power supplies to be installed side-by-side for redundant configurations or segregated loads.
Integration with Ovation auxiliary power distribution architectures allows the 24VDC output to power relay output modules (such as 1C31219G01/1C31223G01 assemblies), analog I/O loops, and field transmitters from a centralized, monitored source. The high efficiency and low thermal footprint reduce cooling system loads in control enclosures, extending the life of adjacent electronic components.
1X00781H01L
Part 4: Technical Specifications
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Model Number: 1X00781H01L
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Manufacturer: Westinghouse Electric Corporation (Emerson Ovation product line)
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Product Type: DIN-Rail Mount Switching Power Supply
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Input Voltage Range: 85–264 VAC (47–63 Hz) or 90–375 VDC
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Input Current: ≤5.5A @ 115VAC, ≤2.8A @ 230VAC (typical)
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Output Voltage: 24 VDC (nominal, adjustable ±10% typical)
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Output Current: 10A continuous (240W)
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Output Power: 240W (standard), up to 360W peak (depending on configuration)
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Efficiency: Up to 95% (depending on load and input voltage)
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Power Factor Correction: Active PFC (>0.95 typical)
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Ripple and Noise: <100mV peak-to-peak (typical)
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Line Regulation: ±0.5% typical
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Load Regulation: ±1% typical
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Protection Features:
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Overcurrent: Foldback current limiting with automatic recovery
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Short Circuit: Hiccup mode with automatic restart
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Overvoltage: Shutdown with latch or automatic recovery (configurable)
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Overtemperature: Thermal shutdown with derating from 60°C to 70°C
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Operating Temperature: -20°C to +60°C (-4°F to +140°F) at full load; derated to 75% power at 70°C
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Storage Temperature: -40°C to +85°C (-40°F to +185°F)
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Humidity: 5% to 95% RH (non-condensing)
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Cooling Method: Natural convection (fanless design)
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Mounting: 35mm DIN rail (standard industrial rail)
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Enclosure Rating: IP20 (control cabinet installation)
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Terminal Blocks: Screw terminals for input/output wiring
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Conformal Coating: Yes (moisture/contaminant protection)
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EMC Compliance: EN 55032 Class B, EN 61000-3-2, EN 61000-6-2
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Safety Standards: UL 508, UL 60950-1, IEC 62368-1 (depending on revision)
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Dimensions: 140 mm × 140 mm × 40 mm (5.5 in × 5.5 in × 1.6 in) – typical
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Weight: 0.5 kg to 1.0 kg (1.1 lbs to 2.2 lbs) depending on packaging
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Status: Active product; available via Emerson and authorized distributors
Part 5: Core Features & Customer Value
Universal AC/DC Input Capability: The 85-264VAC and 90-375VDC input range accommodates global electrical standards and DC battery backup systems without hardware configuration. For multinational corporations and OEMs, this universality eliminates the need for region-specific power supply variants, reducing spare parts inventory complexity and ensuring that any stocked unit can be deployed worldwide.
High-Efficiency Fanless Design: Operating at up to 95% efficiency with natural convection cooling eliminates cooling fans—the component most likely to fail in power supplies. For facilities in remote locations or with limited maintenance access, this fanless architecture significantly extends mean time between failures (MTBF) and eliminates the noise, vibration, and dust accumulation associated with forced-air cooling, improving overall system reliability.
Conformal Coating for Harsh Environments: The protective coating on the PCBA resists moisture, dust, and corrosive atmospheric contaminants common in chemical processing plants, wastewater treatment facilities, and coastal power stations. This coating prevents dendritic growth and short circuits caused by condensation or conductive dust, ensuring reliable operation in ISA-S71.04 Class G3 environments without requiring sealed enclosures or positive pressure systems.
Low Ripple and Noise Output: The <100mV ripple specification ensures clean power for sensitive analog I/O measurements, preventing power supply noise from inducing measurement errors in 4-20mA loops or thermocouple inputs. For custody transfer metering and precision process control applications, this clean power delivery eliminates the need for external filtering or isolation transformers, reducing installation costs and potential failure points.
DIN-Rail Mounting for Rapid Maintenance: The snap-on DIN-rail mounting allows technicians to replace failed power supplies in minutes without tools, minimizing mean time to repair (MTTR) during critical outages. The standardized 35mm rail mounting ensures compatibility with industrial control enclosures worldwide, facilitating rapid procurement and replacement without custom fabrication.
1X00781H01L
Part 6: Typical Applications
Ovation I/O System Power Supply: The 1X00781H01L is extensively deployed as the auxiliary power source for Ovation distributed I/O systems, providing 24VDC to relay output bases (1C31223G01), analog I/O modules, and field transmitter loop power. In power generation control cabinets, multiple units may be installed with diode auctioneering to provide redundant power feeds to critical I/O branches, ensuring continuous operation even if one supply fails.
Remote Pump Station and Well Field Power: Water treatment and distribution facilities utilize the module to power remote Ovation RTUs (Remote Terminal Units) at unmanned pump stations and well fields. The wide DC input range accommodates solar battery systems and DC microgrids, while the -20°C to +60°C operating range ensures reliability in outdoor enclosures subject to seasonal temperature extremes without auxiliary heating or cooling.
Power Generation Auxiliary Control: In coal-fired, gas-fired, and nuclear power plants, the module provides reliable 24VDC power to turbine auxiliary control cabinets, boiler burner management panels, and balance-of-plant I/O. The conformal coating withstands the humid, potentially corrosive environments of turbine halls and boiler houses, while the high efficiency reduces heat load in densely packed auxiliary equipment cabinets.
Chemical and Petrochemical Process Control: Chemical manufacturing facilities employ the module to power Ovation I/O in classified hazardous areas where fan-cooled power supplies could present ignition risks. The fanless design and IP20 enclosure are suitable for installation in purged or sealed enclosures in Division 2 areas, providing reliable power for process analyzers, valve positioners, and safety instrumented system I/O.
Building Automation and Facility Management: Commercial and institutional facilities integrate the module into building management systems for powering Ovation controllers monitoring HVAC equipment, energy meters, and environmental sensors. The compact size and DIN-rail mounting facilitate installation in crowded mechanical rooms, while the universal input accommodates the 208VAC, 240VAC, or 277VAC supplies common in commercial building electrical systems.
