May 25, 2026

Emerson 1X00781H01L Product Description

The Emerson 1X00781H01L (also labeled 1X00781H01) is a high-performance DIN-rail mounted power supply module belonging to the 1X series of the Ovation DCS system (originally Westinghouse, now Emerson). It is designed to deliver stable, clean 24VDC power to Ovation system control cabinets, I/O stations, and control units, serving as the core power supply unit that ensures the continuous and reliable operation of controllers, I/O cards, communication modules, and field instruments. Featuring a wide-range AC/DC input, high-efficiency isolated regulation, and comprehensive protection, this module offers high conversion efficiency, low ripple output, redundant parallel operation, and hot-swap capability. It is widely deployed in process industries such as power, chemical, oil & gas, and metallurgy, where power continuity, stability, and safety are critical, providing a standard power solution for the Ovation DCS system.

Description

Emerson 1X00781H01L Product Description

1. Product Overview

2. Key Features

2.1 Wide-Range Input & Precision Regulation for Global Grid Compatibility

It supports an ultra-wide AC/DC input range: 85–264VAC (47–63Hz) and 90–375VDC, automatically adapting to global industrial grid voltages and frequencies, and tolerates on-site voltage fluctuations, transient surges, or frequency deviations. The output is precision-regulated 24VDC with a rated current of 10A and rated power of 240W (peak 12A/360W). The ripple noise is ≤50mV, supplying clean, interference-free DC power to Ovation controllers, I/O modules, and field sensors/actuators, eliminating control errors, communication interruptions, or equipment malfunctions caused by voltage drift or noise. The output features automatic constant-voltage current limiting, with voltage fluctuation ≤±1% under dynamic load changes, ensuring stable power supply across all operating conditions.

2.2 Multi-Level Electrical Protection for Comprehensive Equipment Safety

It integrates five protection mechanisms: overload, short circuit, overvoltage, overheating, and reverse polarity, enabling rapid response to abnormal conditions. Overload (>110% rated current) triggers automatic current limiting with self-recovery upon fault removal. Output short circuit causes instantaneous cutoff and latch-off, requiring restart after fault clearance. Output overvoltage (>28VDC) results in immediate shutdown to prevent backend equipment damage. Internal temperature >85°C activates overheating protection, with automatic recovery after cooling. Input reverse polarity locks the circuit to avoid module burnout. Protection actions are precise and fast, preventing fault propagation and fully safeguarding Ovation system hardware and field devices.

2.3 High-Efficiency Isolation & Low-Noise Cooling for Long-Term Harsh Environment Operation

It adopts a high-frequency isolation transformer and optocoupler isolation design, with 2500V AC/1min dielectric strength between input and output, effectively blocking grid interference, ground potential differences, and common-mode signals, preventing power loop interference from affecting DCS control accuracy and communication stability. The conversion efficiency reaches up to 90%, reducing heat generation through low-power design. It uses natural convection cooling (fanless), avoiding fan-related failures from dust accumulation and aging, ensuring silent, maintenance-free operation suitable for high-dust, high-humidity, and salt-laden industrial environments. The PCB is coated with a thick conformal coating (moisture, dust, and corrosion resistance), further enhancing insulation and service life in extreme conditions.

2.4 Redundant Parallel Operation & Hot-Swap for Uninterrupted Power Supply

It supports 1:1 or N+1 redundant parallel operation. Two identical modules operate in parallel with load sharing; if one fails, the other seamlessly takes over the full load within ≤10ms, ensuring no power interruption or data loss, meeting zero-downtime requirements for critical processes in power plants and chemical facilities. The module features standard DIN-rail mounting and hot-swap capability, enabling online replacement without shutting down the DCS system or disrupting other equipment, reducing planned downtime and maintenance costs.

2.5 Wide Temperature & Vibration Resistance + Intelligent Diagnostics for Harsh Conditions & Easy Maintenance

Constructed with industrial-grade wide-temperature components, it operates reliably from -20°C to +60°C (storage: -40°C to +85°C), withstanding extreme temperature shocks and fluctuations. The reinforced mechanical structure meets IEC 60068-2-6/2-27 standards for enhanced vibration and shock resistance, ensuring long-term stability in vibrating, high/low-temperature industrial sites. The front panel has Power OK, Run, and Fault LEDs for visual indication of input status, normal output, and overload/short-circuit/overheating faults. System-side remote power status monitoring enables real-time tracking of output voltage, current, temperature, and fault logs, facilitating remote and predictive maintenance.

2.6 Standardized Compatibility & Compact Design for Flexible Installation & Expansion

Designed for standard 35mm DIN-rail mounting, it is easy to install and secure, saving cabinet space. The compact dimensions (60mm × 125mm × 63mm) allow high-density arrangement, optimizing cabinet space utilization. It is fully compatible with all Ovation controllers (OCR1100/OCR3000), 1X series I/O modules, and communication interface cards. Interchangeable with peer power modules (e.g., 1X00707H01), it simplifies project expansion, spare parts replacement, and legacy system upgrades, protecting long-term investments.

3. Technical Specifications

Model: 1X00781H01L (also marked 1X00781H01)
Brand: Emerson (formerly Westinghouse)
Series: Ovation DCS 1X Series, Power Supply Module
Input Voltage: 85–264VAC (47–63Hz) / 90–375VDC (wide-range auto-sensing)
Output Voltage: 24VDC (regulated, ±1% accuracy, ±10% adjustable in some versions)
Output Current: 10A (continuous rated), 12A (peak short-term)
Rated Power: 240W (typical peak 360W)
Conversion Efficiency: Up to 90% (full load)
Ripple & Noise: ≤50mV (peak-to-peak)
Dielectric Isolation: 2500V AC/1min (input to output)
Protection Features: Overload, short circuit, overvoltage, overheating, reverse polarity
Cooling Method: Natural convection (fanless)
Mounting: Standard 35mm DIN rail
Operating Temperature: -20°C to +60°C
Storage Temperature: -40°C to +85°C
Relative Humidity: 5%–95% RH (non-condensing)
Vibration/Shock Resistance: Compliant with IEC 60068-2-6/2-27
EMC Certifications: CE, UL 508, CSA, RoHS
Protection Class: IP20 (cabinet installation)
Dimensions (W×H×D): 60mm × 125mm × 63mm
Weight: Approx. 0.8kg
Warranty: 12-month original manufacturer warranty

4. Product Advantages

4.1 Wide Input & Precision Regulation for Global Grid Adaptability

The ultra-wide AC/DC input range accommodates diverse industrial power environments. The 24VDC high-precision regulated output with low ripple noise delivers clean, stable power to the DCS, preventing voltage fluctuation-induced equipment failures.

4.2 Comprehensive Protection & Isolation for Safety & Reliability

Five-fold protection ensures automatic fault response and robust safety. High-voltage input-output isolation mitigates grid interference, safeguarding the power loop and control system.

4.3 High Efficiency, Low Noise & Wide Temperature/Vibration Resistance for Harsh Conditions

High conversion efficiency and fanless natural cooling enable maintenance-free, silent operation. The wide operating temperature range and rugged mechanical design withstand extreme temperatures, vibration, and dust for long-term reliability.

4.4 Redundancy, Hot-Swap & Intelligent Diagnostics for Easy Maintenance

Dual-module redundant parallel operation ensures millisecond-level switching and uninterrupted power. Online hot-swap replacement eliminates downtime. LED indicators and remote monitoring enable fast fault localization, reducing maintenance costs and downtime risk.

4.5 Standardized Compatibility & Compact Design for Flexible Expansion

Standard DIN-rail mounting and compact size save space. Full compatibility with Ovation devices and interchangeability with peer modules simplify expansion and spare parts replacement, protecting long-term investments.

5. Applications

5.1 Power Industry

Deployed in Ovation DCS cabinets of thermal, hydro, and nuclear power plants, supplying 24VDC to controllers, I/O modules, communication cards, on-site solenoid valves, indicators, and sensors. Suited for high-temperature, strong electromagnetic interference environments requiring high reliability, ensuring continuous, stable power to unit control and monitoring equipment.

5.2 Chemical Industry

Used in I/O stations of petroleum refining, fine chemical, coal chemical, and fertilizer production units, powering Ovation I/O modules, valve positioners, transmitters, solenoid valves, and safety interlock devices. Operates reliably in corrosive gas, humid, explosive, and high-interference environments, ensuring safe power supply to process control equipment.

5.3 Oil & Gas Industry

Applied in Ovation systems of onshore oil/gas fields, offshore platforms, long-distance pipelines, and LNG terminals, supplying power to remote I/O stations, pipeline RTUs, tank monitoring instruments, and compressor control modules. Withstands field sand, salt spray, extreme temperature swings, and vibration shock, ensuring stable power for oil/gas production and transportation equipment.

5.4 Metallurgy Industry

Installed in Ovation I/O cabinets of steel and non-ferrous smelting blast furnaces, heating furnaces, rolling lines, and continuous casting equipment, powering on-site sensors, actuators, control modules, and communication devices. Adapts to dust, high-temperature radiation, strong electromagnetic interference, and vibration shock, ensuring reliable operation of metallurgical process control equipment.

5.5 Other Industrial Scenarios

Powers dosing pump control modules, water quality monitors, and valve actuators in large water treatment plants; supplies power to kilns, mills, and preheater control systems in cement manufacturing; supports production line control and monitoring modules in paper and pharmaceutical industries; and serves Ovation devices in new energy power station energy storage systems and PV/wind inverter 配套 applications, catering to all industrial scenarios requiring highly reliable 24VDC power.

6. Installation & Maintenance

6.1 Installation

Select a vacant standard 35mm DIN rail in the Ovation cabinet, reserving ≥5cm vertical ventilation space and locating away from high-power inverters, motors, and transformers. Align the module’s bottom clip with the rail and push until a "click" confirms secure mounting, ensuring vertical, stable installation. Maintain ≥2cm spacing between densely installed modules for heat dissipation.

6.2 Wiring

Use multi-strand copper insulated wires for input (mains or DC power), distinguishing live, neutral, and ground wires with moderate terminal torque to avoid loosening and overheating. Connect output to the Ovation backplane or 24VDC loads, strictly observing polarity; series an air switch for maintenance access. Route input and output cables separately, maintaining ≥30cm distance from power cables to reduce electromagnetic interference. Verify wiring for shorts/misconnections before powering on; measure input/output voltage with a multimeter to confirm normal operation.

6.3 Routine Maintenance

Weekly: Inspect LED status, module appearance, and terminals for overheating, loosening, corrosion, or dust accumulation. Daily: Monitor output voltage, current, temperature, and fault logs via remote system access. Monthly: Clean surface dust with a dry soft cloth or low-pressure clean air (bi-weekly in high-dust/humid/salt-laden environments); avoid corrosive liquids. Quarterly: Check terminal tightness, cable insulation, and DIN rail security to prevent faults from loosening or aging insulation.

6.4 Fault Handling

No output (Fault LED on): Check input power, wiring looseness/shorts, and overload/short-circuit loads. Disconnect loads and restart; replace if fault persists.
Abnormal output voltage: Verify input voltage range, load level, and module temperature. Reduce load or improve heat dissipation; replace if necessary.
Frequent redundant switching: Check for inconsistent output parameters between modules, excessive load fluctuation, or aging modules. Calibrate parameters or replace faulty units.

7. Ordering Information

Model: 1X00781H01L (1X00781H01)
Brand: Emerson
Series: Ovation DCS 1X Series
Type: DIN-Rail Mounted 24VDC High-Performance Power Supply Module
Function: Wide-range AC/DC input, 24VDC regulated output, multi-protection, isolation, redundant parallel operation, hot-swap, core DCS power supply
Compatibility: Ovation DCS (v3.7+), OCR1100/OCR3000 controllers, 1X series I/O modules
Packaging: Original anti-static sealed package with installation manual, certificate, terminals, and warranty card
Warranty: 12-month original warranty with 24/7 technical support and after-sales service

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