Description
1X00781H01L: Product Overview
The 1X00781H01L serves as the fundamental power infrastructure component within the Westinghouse Ovation Distributed Control System (DCS), providing the stable, regulated 24 VDC power required by all Ovation I/O and communication modules. In industrial automation architectures, power supply reliability directly correlates with system availability—this module addresses that critical requirement through robust design, universal input compatibility, and comprehensive protection features.
Positioned typically in the upper section of Ovation control cabinets or remote I/O enclosures, the 1X00781H01L mounts on standard 35mm DIN rails, allowing flexible placement and easy integration with other panel components. Its primary role is power conversion and conditioning: it accepts raw AC power from plant electrical distribution systems (or DC power from battery backup systems) and transforms it into clean, regulated 24 VDC with minimal ripple and noise. This regulated output then distributes through internal power buses to Ovation I/O modules, controller processors, network switches, and operator interface devices.
The module’s universal input capability (85-264 VAC or 90-375 VDC) eliminates the need for voltage-specific variants, simplifying spare parts inventory and allowing deployment across global installations with varying nominal voltages. In power generation facilities, this flexibility proves particularly valuable—units can operate from 120 VAC control power in North American plants or 230 VAC in European installations without hardware modification. The DC input capability also supports connection to uninterruptible power supply (UPS) systems or 125 VDC station batteries common in substation and power plant applications, ensuring control system continuity during AC power disturbances.
As part of the Ovation platform ecosystem, the 1X00781H01L integrates with system redundancy strategies. Multiple modules can operate in parallel (N+1 configuration) with load sharing, ensuring that failure of a single power supply does not result in I/O section loss. This redundancy capability, combined with the module’s extensive diagnostic features, aligns with the Ovation system’s design philosophy of high availability and predictive maintenance support.
1X00781H01L
1X00781H01L: Technical Specifications
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Model Number: 1X00781H01L
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Manufacturer: Westinghouse Electric Corporation (legacy product, now Emerson Automation Solutions)
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Product Type: DIN-Rail Mount Power Supply Module
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System Family: Ovation Expert Control System
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Input Voltage Range: 85-264 VAC (auto-sensing) or 90-375 VDC
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Input Frequency (AC): 47-63 Hz
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Output Voltage: 24 VDC (regulated)
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Output Current: 10 A continuous
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Rated Output Power: 240W (standard) / 360W (peak)
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Efficiency: Up to 95% at full load
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Voltage Regulation: ±1% typical (line and load regulation)
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Ripple and Noise: <50 mV peak-to-peak
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Hold-Up Time: >20 ms at 120 VAC input, full load
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Protection Features: Overvoltage protection (OVP), overcurrent protection (OCP), short-circuit protection (SCP), over-temperature protection (OTP), reverse polarity protection (DC input)
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Isolation: Input-to-output isolation 2.5 kV RMS
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Operating Temperature: -40°C to +70°C (derated to 75% power from +60°C to +70°C)
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Storage Temperature: -40°C to +85°C
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Relative Humidity: 5% to 95%, non-condensing
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Shock Resistance: 10 g RMS, 11 ms, three axes
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Vibration Resistance: 2.5 g RMS, 10-2000 Hz, three axes
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Enclosure Rating: IP20 (touch protection, dust protected)
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Mounting: 35mm DIN rail (EN 60715)
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Dimensions: Approximately 140 × 140 × 40 mm (5.5 × 5.5 × 1.6 in)
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Weight: 0.68 kg (1.5 lbs) / 1.15 lbs (varies by source)
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Conformal Coating: Yes, PCB protected against moisture and contaminants
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Certifications: CE, UL, cUL, RoHS compliant
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Parallel Operation: Supports N+1 redundancy with current sharing
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Status Indication: LED indicators for power OK, overload, and fault conditions
Core Features & Customer Value
Universal Input Eliminates Voltage Compatibility Issues: The 85-264 VAC and 90-375 VDC input range removes the traditional requirement for separate 120 VAC and 240 VAC power supply variants. For multinational corporations and system integrators, this simplifies spare parts logistics—one part number serves global installations. In facilities with mixed power infrastructure, the auto-sensing input automatically adapts to available voltage without dip switch configuration or wiring changes, reducing commissioning errors and startup delays.
High Efficiency Reduces Operating Costs and Thermal Load: With efficiency ratings up to 95%, the module minimizes energy waste as heat dissipation. In densely populated control cabinets containing multiple power supplies, this efficiency translates to lower air conditioning loads and reduced thermal stress on adjacent electronic components. Over a 20-year plant lifecycle, the efficiency improvement compared to older 80% efficient designs yields measurable energy cost savings, particularly in continuous-process industries where power supplies operate 24/7.
Comprehensive Protection Preserves Downstream Equipment: The multi-layer protection scheme—overvoltage, overcurrent, short-circuit, and thermal—acts as a defensive barrier for expensive Ovation I/O modules and controllers. In the event of a field wiring short circuit or module failure, the power supply current limiting prevents damage to the backplane and adjacent channels. Overvoltage protection ensures that transient voltage spikes from plant electrical systems do not propagate as damaging overvoltage on the 24 VDC bus. These protections reduce the cascade failure scenarios that can result from simple wiring errors during maintenance activities.
Conformal Coating Extends Service Life in Harsh Environments: The protective coating applied to the printed circuit board provides resistance against humidity, corrosive gases (H2S, SO2 common in wastewater and petrochemical facilities), and conductive dust. In coastal power plants or chemical processing units where standard power supplies might fail within months due to corrosion, this coating extends operational life significantly. The IP20 enclosure rating provides basic touch protection while allowing natural convection cooling without fan failure modes.
DIN-Rail Mounting Simplifies Installation and Maintenance: The 35mm DIN rail mounting standard allows quick installation without tools and easy removal for replacement. In redundant configurations, technicians can extract a failed unit and insert a spare without disturbing wiring terminations, minimizing mean-time-to-repair (MTTR). The compact 140mm width optimizes panel space utilization, allowing multiple power supplies or other DIN-rail components in confined enclosures.
1X00781H01L
Typical Applications
Power Plant Control System Power Distribution: In fossil fuel and nuclear power plants utilizing Ovation DCS platforms, the 1X00781H01L serves as the primary power source for turbine control I/O, boiler control modules, and balance-of-plant auxiliary systems. The DC input capability (90-375 VDC) allows direct connection to 125 VDC station batteries, ensuring control system operation during AC grid disturbances—a critical requirement for turbine protection systems. The module’s -40°C rating accommodates outdoor auxiliary cabinets in northern climates without auxiliary heating.
Water and Wastewater Treatment SCADA Systems: Municipal water treatment facilities deploy this power supply to energize remote terminal units (RTUs), chemical feed pump controllers, and telemetry equipment within Ovation-based SCADA architectures. The universal input accepts 120 VAC at well sites or 240 VAC at treatment plants, while the conformal coating withstands the humid, chlorine-laden atmospheres of filtration buildings. Redundant configurations ensure continuous disinfection chemical feed even during power supply maintenance.
Oil and Gas Pipeline Control: Pipeline pump stations and metering facilities utilize the 1X00781H01L to power flow computer I/O, valve actuator controls, and communication gateways. The wide temperature range (-40°C to +70°C) accommodates above-ground installations in desert and arctic environments without environmental enclosures. The high shock and vibration resistance (10g/2.5g) withstands the mechanical stresses of compressor station installations.
Chemical Plant Process Control: In petrochemical and specialty chemical facilities, the module powers Ovation safety instrumented system (SIS) I/O and basic process control system (BPCS) modules. The low ripple output (<50 mV) ensures clean power for sensitive analog measurement circuits, while the isolation barrier prevents ground loop currents between field devices and the control system. Parallel redundant configurations meet the high availability requirements of exothermic reactor control systems where power loss could result in hazardous conditions.
