EMERSON 1X00781H01 Product Description

I. Product Overview

The Emerson 1X00781H01 (commonly referred to as 1X00781H01L) is a high-performance DIN-rail power module of the 1X series from the original Westinghouse (now Emerson) Ovation DCS system. It is specifically designed to provide stable and pure 24VDC power for Ovation system control cabinets, I/O stations, and control units, serving as the core power supply unit to ensure the continuous and reliable operation of controllers, I/O cards, communication modules, and field instruments. The module features wide-range AC/DC input, efficient isolation voltage regulation, and comprehensive protection design, with high conversion efficiency, low ripple output, redundant parallel operation, and hot-swappable capabilities. It is suitable for process industries such as power, chemical, oil and gas, and metallurgy that have strict requirements for power continuity and stability, providing a standard power supply solution for the Ovation DCS system. 

II. Core Functions

1. Ultra-wide input + Precise Voltage Stabilization, Compatible with Global Industrial Power Grids

Supports ultra-wide range of AC input from 85–264VAC (47–63Hz) and DC input from 90–375VDC. Automatically adapts to the voltage and frequency of the global industrial power grid, unaffected by voltage fluctuations, instantaneous surges, or frequency deviations. The output is a high-precision stabilized 24VDC with a rated current of 10A and a rated power of 240W, with a ripple noise of ≤ 50mV. It provides a pure and interference-free DC power supply for Ovation controllers, I/O modules, and on-site sensors/actuators, avoiding control errors, communication interruptions, or equipment malfunctions caused by voltage drift or interference. The output features automatic constant voltage and current limiting, with voltage fluctuations ≤ ±1% when the load changes, ensuring stable power supply under all operating conditions.

2. Multiple Electrical Protection, Comprehensive Protection for Equipment Safety

Built-in five protection mechanisms: overload, short circuit, overvoltage, overtemperature, and reverse polarity. Can quickly respond to abnormal conditions: automatically limit current when the load is overloaded (>110% rated current) and restore after the fault is resolved; immediately cut off the output and lock it when there is a short circuit; immediately shut off the output when overvoltage (>28VDC) occurs to prevent the back-end equipment from burning out; trigger overheating protection when the internal temperature > 85℃, and automatically restore after cooling; self-lock the circuit when there is reverse polarity input to avoid module burnout. The protection actions are precise and responsive, preventing fault chain escalation, and fully protecting the core hardware of the Ovation system and on-site equipment safety.

3. Efficient Isolation + Low-noise Heat Dissipation, Long-term Operation in Harsh Environments

Uses high-frequency isolation transformers + optocoupler isolation design, with an electrical isolation strength of 2500V AC/1min between input and output, effectively blocking grid-side interference, ground potential difference, and common-mode signals from entering, preventing power supply circuit interference from affecting the control accuracy and communication stability of the DCS system. The conversion efficiency is up to 90%, with low power consumption design to reduce heat generation; uses natural convection cooling (without fan), avoiding fan dust accumulation, aging, and resulting faults, operating with zero noise and no maintenance, suitable for harsh industrial environments with high dust, high humidity, and salt spray. The surface of the circuit board is coated with a thick three-proof coating (anti-humidity, dust-proof, corrosion-proof), further enhancing insulation performance and service life in extreme conditions.

4. Redundant Parallel + Hot Swap, Ensuring Continuous Power Supply without Interruption

Supports dual-module redundant parallel operation. Two power modules of the same model operate in parallel, distributing the load evenly. When one module fails, the other automatically takes over all loads seamlessly, with a switching time ≤ 10ms, without power interruption or data loss, meeting the "zero downtime" operation requirements for power stations, chemical plants, etc. The module adopts standard DIN rail installation + hot swap design, allowing online replacement and maintenance without shutting down the DCS system, not affecting the normal operation of other equipment, reducing planned downtime and lowering maintenance costs.

5. Wide Temperature Resistance + Intelligent Diagnosis, Suitable for Harsh Operating Conditions for Easy Maintenance

Uses industrial-grade wide-temperature components, with a working temperature range of **-20℃ ~ +60℃ and a storage temperature range of - 40℃ ~ +85℃. Can withstand high and low temperature shocks and drastic temperature fluctuations. The mechanical structure is strengthened to have anti-vibration and anti-shock capabilities, meeting IEC 60068-2-6/2-27 standards, and can operate stably in vibrating, high-temperature, and low-temperature extreme industrial sites. The panel is equipped with power supply, operation, and fault LED indicators, which can directly display input status, normal output, overload/short circuit/overheating faults; The system end supports remote monitoring of power supply status, allowing real-time viewing of output voltage, current, temperature, and fault records, facilitating remote operation and predictive maintenance.

6. Standard compatibility + Compact design, flexible and efficient installation expansion

Compatible with standard 35mm DIN rails, easy installation, secure fixation, saving cabinet space; compact size design (60mm×125mm×63mm), supporting high-density arrangement, improving cabinet space utilization. Perfectly compatible with Ovation's full range of controllers (OCR1100/OCR3000), 1X series I/O modules and communication interface cards, with parameters consistent and interchangeable with the same series power modules (such as 1X00707H01), facilitating project expansion, spare parts replacement, and upgrading of old equipment, providing convenient and efficient protection for users' long-term investment.

III. Technical Parameters

Model: 1X00781H01 (Standard Identification: 1X00781H01L)

Brand: Emerson (formerly Westinghouse)

Series: Ovation DCS 1X Series Power Module

Input Voltage: 85–264VAC (47–63Hz) / 90–375VDC (wide-range automatic sensing)

Output Voltage: 24VDC (stable voltage, ±1% accuracy, partially adjustable ±10%)

Output Current: 10A (rated continuous), 12A (peak short-time)

Rated Power: 240W (typical peak 360W)

Conversion Efficiency: Up to 90% (rated load)

Ripple Noise: ≤50mV (peak-to-peak)

Electrical Isolation: 2500V AC/1min (input - output)

Protection Functions: Overload, Short Circuit, Overvoltage, Over Temperature, Reverse Polarity Protection

Heat Dissipation Method: Natural Convection (no fan)

Installation Method: Standard 35mm DIN Rail

Operating Temperature: -20℃ ~ +60℃

Storage Temperature: -40℃ ~ +85℃

Environmental Humidity: 5%~95% RH (no condensation)

Anti-Vibration / Impact: Compliant with IEC 60068-2-6/2-27 standards

Electromagnetic Compatibility: CE, UL 508, CSA, RoHS Certification

Protection Grade: IP20 (installed in cabinet)

Physical Dimensions: 60mm×125mm×63mm (width × height × depth)

Weight: Approximately 0.8kg

Warranty: 12 months original warranty

IV. Product Features

1. Wide voltage input + Precise voltage stabilization, compatible with global power grids

Extremely wide AC/DC input range, compatible with various industrial power supply environments; 24VDC high-precision voltage stabilization output, low ripple noise, providing pure and stable power supply for DCS systems, avoiding equipment failures caused by voltage fluctuations.

2. Five protections + Isolation design, safe and reliable

Overload, short circuit, overvoltage, over temperature, reverse polarity all protection, automatic response to faults, complete safety protection; Input and output high voltage isolation, effectively resisting grid interference, ensuring the safety of the power supply circuit and the control system.

3. High efficiency low noise + Wide temperature resistance vibration, suitable for harsh working conditions

High conversion efficiency, natural heat dissipation without fan, maintenance-free, zero noise; wide temperature working range + reinforced mechanical structure, able to withstand high and low temperatures, vibration, dust, etc., stable and reliable long-term operation.

4. Redundant hot-swappable + Intelligent diagnosis, convenient operation

Dual-module redundant parallel connection, millisecond-level switching, no power interruption; supports online hot-swappable replacement, no need for shutdown; LED indicator lights + remote status monitoring, quick fault location, reducing operation costs and downtime risks.

5. Standard compatibility + Compact design, flexible expansion

Standard DIN rail installation, compact size saves space; perfectly compatible with the entire Ovation series of equipment, can be interchanged with the same model power supply, convenient for project expansion, spare parts replacement, and protection of long-term investment.

V. Application Scope

1. Power Industry

Ovation DCS cabinets for power plants such as thermal power plants, hydropower plants, and nuclear power plants, providing 24VDC power for controllers, I/O modules, communication cards, on-site solenoid valves, indicator lights, sensors, etc., suitable for high-temperature, strong electromagnetic interference, and high-reliability requirements of power station environments, ensuring continuous and stable power supply for unit control and monitoring equipment.

2. Chemical Industry

I/O stations for petroleum refining, fine chemicals, coal chemical, and fertilizer production facilities, providing power for Ovation system I/O modules, positioners, on-site transmitters, solenoid valves, safety interlock equipment, etc., capable of stable operation in corrosive gases, dampness, explosion-proof, and strong interference environments, ensuring the safety of production process control equipment power supply.

3. Oil and Gas Industry

Ovation systems for onshore oil and gas field stations, field extraction platforms, long-distance pipelines, LNG receiving stations, providing power for remote I/O stations, pipeline RTUs, tank monitoring instruments, compressor unit control modules, etc., able to withstand harsh environments such as sandstorms, salt fog, extreme temperature differences, and vibration shocks, ensuring stable power supply for oil and gas production and transportation equipment.

4. Metallurgical Industry

Ovation I/O cabinets for steel, non-ferrous metal smelting blast furnaces, heating furnaces, rolling production lines, continuous casting equipment, providing power for on-site sensors, actuators, control modules, communication equipment, etc., adaptable to harsh working conditions such as dust, high-temperature radiation, strong electromagnetic interference, and vibration shocks, ensuring reliable operation of metallurgical process control equipment.

5. Other Industrial Scenarios

Power supply for Ovation system control modules of large water treatment plants, water quality monitoring instruments, valve actuators, etc.; power supply for control and monitoring modules of cement manufacturing kilns, mills, preheaters, etc. of control systems; power supply for equipment control and monitoring modules of papermaking and pharmaceutical production lines; power supply for energy storage systems and photovoltaic/fossil wind inverter equipment of new energy power stations, etc., suitable for various industrial scenarios requiring high-reliability 24VDC power supply.

VI. Installation and Maintenance

1. Installation

Select the standard 35mm DIN rail space in the Ovation cabinet, reserve space for ventilation (≥5cm), away from high-power frequency converters, motors, transformers and other strong interference equipment. Push the module bottom snap onto the rail and hear the "click" sound to fix firmly, ensuring vertical installation and no looseness. When installing multiple modules densely, keep the spacing ≥2cm to ensure heat dissipation and avoid affecting power efficiency and lifespan due to high temperature.

2. Wiring

For the input side, use multi-strand copper core insulated wires to connect to the mains or DC power supply, distinguish the live wire, neutral wire, and ground wire, tighten the terminals moderately to avoid loosening and overheating; for the output side, connect to the Ovation backplane or 24VDC load,严禁reverse positive and negative poles， it is recommended to connect in series with an air switch for easier maintenance. Separate the input and output cables， keep a distance of ≥30cm from the power cable， reduce electromagnetic interference. After wiring， check the lines to ensure no short circuits， wrong connections， etc.， before powering on， use a multimeter to measure the input/output voltage normally before putting it into operation.

3. Daily Maintenance

Regularly (weekly) inspect the LED indicator light status， module appearance， and connection terminals， check for overheating， loosening， corrosion， and dust accumulation； monitor the output voltage， current， temperature， and fault records daily through remote monitoring of the system； regularly (monthly) use a dry soft cloth or low-pressure clean air to clean surface dust， shorten the cleaning cycle in high-dust/high-humidity/salt fog environments (every two weeks)， prohibit wiping with corrosive liquids； Quarterly checks should be conducted on the tightness of the terminal connections, the insulation condition of the cables, and the fixation status of the DIN rails to prevent faults caused by loosening or aging insulation.

4. Fault Handling

No output (fault indicator light on): Check if the input power is normal, if the connections are loose / short-circuited, and if the load is overloaded / short-circuited. Restart the module after disconnecting the load. If the fault persists, replace the module;

Abnormal output voltage: Check if the input voltage is out of range, if the load is too heavy, and if the module temperature is too high. Reduce the load or improve heat dissipation, and replace the module if necessary;

Frequent redundant switching: Check if the output parameters of the two modules are consistent, if the load fluctuates too much, and if the modules are aging. Calibrate the parameters or replace the faulty module.

VIII. Order Information

Product Model: 1X00781H01 (1X00781H01L)

Brand: Emerson 

Series: Ovation DCS 1X Series

Product Type: DIN-rail-mounted 24VDC high-performance power module

Function: Wide-range AC/DC input, 24VDC regulated output, multiple electrical protections, isolation anti-interference, redundant parallel, hot-swappable maintenance, core power supply for DCS system

Compatible System: Ovation DCS system (compatible with versions 3.7 and above, compatible with OCR1100/OCR3000 controllers and 1X series I/O modules)

Packaging: Factory original anti-static sealed packaging, including installation manual, certificate of conformity， terminal connections， warranty card

Warranty： 12-month original warranty， providing 7×24-hour technical support and after-sales maintenance services