Brief Product Description

Emerson 1X00781H01L, originally Westinghouse, is DIN rail mounted switching power supply dedicated for Ovation DCS system. Wide range AC/DC input converts to regulated 24VDC 10A (240W, peak 360W) to supply Ovation controller, I/O baseplates and cabinet electronic loads. Equipped with active PFC, conformal coating for ISA S71.04 G3 corrosive environment, front panel DC OK status LED. Supports parallel redundant operation, can be hot replaced under safety lockout. Widely deployed in power plant Ovation DCS cabinets. This legacy power supply has been phased out by Emerson, only surplus and fully refurbished tested units available for existing Ovation system maintenance and spare replacement.

Core Product Functions

• DIN rail mount industrial power supply for Emerson Ovation DCS
• Input: 85~264VAC / 90~375VDC wide universal input
• Output: 24VDC, rated 10A / 240W, peak 360W
• Built-in overvoltage, overcurrent, short-circuit and overtemperature protection
• Conformal coated PCB, suitable for industrial corrosive environment G3 level
• Supports parallel redundant operation for high availability DCS cabinet
• Active PFC design, low ripple and stable 24VDC output for sensitive I/O modules
• Front panel LED indicator for power healthy diagnosis
• Supports hot swap replacement with proper LOTO safety procedures

Application Scenarios

• Legacy Emerson Ovation DCS cabinet 24VDC auxiliary power supply
• Thermal power plant boiler, turbine DCS controller and I/O rack power
• Combined cycle power plant control cabinet redundant power system
• Oil & gas, pipeline RTU and compressor station automation power
• Petrochemical process control cabinet stable 24V instrument power
• Ovation DCS spare replacement, maintenance and system retrofit projects

FAQ (Frequently Asked Questions)

• Q: No 24VDC output after installing 1X00781H01L?
  A: Check AC/DC input wiring, input voltage range, short circuit on Ovation I/O loads, overtemperature protection trigger, DC OK LED status and terminal connection.
• Q: Can multiple 1X00781H01L run in parallel?
  A: Yes, support parallel redundant configuration for Ovation DCS cabinet to realize bumpless power backup.
• Q: What is common failure mode of this power supply?
  A: Electrolytic capacitor aging, fan failure (if equipped), input rectifier damage, over-temperature shutdown under heavy load.
• Q: Is 1X00781H01L available for new DCS projects?
  A: Emerson end-of-life product, no new original production. Recommend latest Ovation power supply variant. Only surplus/refurbished spares for existing Ovation DCS maintenance.
• Q: Can it power field transmitters directly?
  A: Yes, can supply 24VDC for 4-20mA field instruments besides Ovation rack I/O baseplates.