Description
At-A-Glance Executive Brief
- Model: 1X00781H01L (user input:1X00781HO1L, O is zero typo)
- Brand: Emerson Ovation (Westinghouse)
- Part Type: DIN rail mounted switching power supply module
- Lifecycle status: Obsolete OEM, stocked new surplus and refurbished
- System compatibility: Ovation DCS cabinet, I/O drop chassis, field terminal assemblies
- Rated: 24VDC, 10A, 240W continuous (peak 360W)
- Core function: Convert wide-range AC/DC input to regulated 24VDC, supply power to Ovation I/O modules and field auxiliary equipment, conformal coated for harsh plant environment
Technical Introduction
The 1X00781H01L is an industrial DIN-rail power supply designed for Emerson Ovation distributed control systems widely deployed in power plants and process industries. It accepts wide universal input (85–264VAC or 90–375VDC) and provides stable filtered 24VDC output for Ovation I/O racks, terminal bases and other cabinet low-voltage loads. It adopts active PFC design, with conformal coating to meet ISA S71.04 G3 corrosive environment standard. Front panel “DC OK” LED indicates healthy output status. Built-in multi-level circuit protection enables single or redundant parallel operation to power critical control I/O loads, preventing system shutdown from power failure.
Engineer’s Takeaway This is DIN rail style auxiliary power supply, different from the slot-type rack power supply like 1X00024H01. It can be used in redundant parallel configuration. The conformal coating makes it suitable for plant corrosive atmosphere. Verify total crate load current before replacement to avoid overload.
Core Technical Specifications
| Parameter | Value |
|---|---|
| Model | 1X00781H01L |
| Mounting | DIN rail |
| Input Range | 85–264 VAC / 90–375 VDC |
| Output | 24 VDC |
| Rated Output Current | 10A |
| Rated Power | 240W, peak 360W |
| PFC | Active power factor correction |
| Protection | Overvoltage, undervoltage, overcurrent, short-circuit, overtemperature, reverse polarity |
| Coating | Conformal coating (ISA S71.04 G3) |
| Enclosure | IP20 |
| Operating Temp | -40℃ ~ +70℃ (derate above 60℃) |
| Diagnostics | DC OK status LED |
Field Engineer’s Tech Notes
- If redundant configuration exists, switch load to standby unit before replacement to avoid I/O power loss.
- Check cabinet air filter and ventilation. High ambient temperature will trigger thermal shutdown and shorten service life.
- Verify wiring torque and terminal tightness; loose terminals create heat and voltage drop.
- After installation, measure 24VDC output voltage under full load, confirm DC OK LED stays on and no power alarms in Ovation system.
- When paralleling multiple power supplies, use same model to prevent current imbalance.
Adaptive QA & Testing Protocol
Each unit undergoes bench power testing. Wide AC input variation test verifies stable 24VDC output under partial and full load. Overload, short-circuit and overtemperature protection functions are validated. DC OK LED status is checked. Conformal coating visual inspection and terminal screw inspection are performed. Test reports and short validation videos are available upon request.
Buyer’s FAQ
Q: Is 1X00781HO1L same as 1X00781H01L? A: Yes, 1X00781HO1L is common typo, the correct part number is 1X00781H01L, the character is numeral zero not letter O.
Q: What warranty applies to new surplus or refurbished Emerson 1X00781H01L? A: All units carry a 12-month hardware warranty. Warranty excludes damage from overload, input surge, over-temperature due to poor ventilation and field wiring faults.
Q: Can this power supply run in redundant parallel? A: Yes, it supports parallel redundant operation for Ovation cabinet I/O loads.
Q: What lead time applies to this obsolete Ovation DIN rail power supply? A: Stocked units ship within 1–3 working days. If out of stock, sourcing lead time can extend to 4–8 weeks subject to inventory availability.
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