Emerson WH1-2FF

Emerson WH1-2FF

Product Brief Introduction: WH1-2FF is Ovation rack power supply module, providing stable DC operating power for Ovation I/O modules and controller modules installed inside the rack. It converts AC input power from plant cabinet power distribution to regulated low voltage DC power required by Ovation rack backplane. The module includes overvoltage, overcurrent and overheat protection circuits. It supports redundant power supply configuration to improve system availability for critical process control racks.

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Description

Emerson WH1-2FF

Technical Specifications

  • Input voltage: 100V AC to 240V AC
  • Output voltage: Regulated DC for Ovation rack backplane
  • Input frequency: 47Hz to 63Hz
  • Operating temperature: 0°C to +60°C
  • Storage temperature: -40°C to +85°C
  • Relative humidity: 5% to 95%, non-condensing
  • Mounting: Ovation standard rack dedicated power slot installation
  • Diagnostic functions: Overvoltage protection, overcurrent protection, overtemperature protection, input power loss alarm

Functional Features

  1. Convert wide-range AC input into stable regulated DC power for Ovation rack backplane and all plug-in modules.
  2. Built-in comprehensive protection mechanism including overvoltage, overcurrent and overtemperature shutdown.
  3. Support redundant parallel installation. Automatic seamless power switchover when one power supply fails.
  4. Active power factor correction circuit reduces grid harmonic interference.
  5. Built-in EMI filter to suppress power line noise entering DCS rack.
  6. Front panel LED indicators show input power status, output normal status and fault alarm status.
  7. Internal temperature sensor monitors heating state of power conversion circuit.
  8. Continuous self-monitoring during operation and fault alarm signal upload to Ovation system.

Application Scenarios Ovation DCS control rack power feeding in thermal power plants, chemical plant DCS cabinet power supply, oil refinery control system cabinet, pulp and paper process control rack, pharmaceutical production DCS cabinet.

Performance Parameters

  • Power conversion efficiency: Greater than 88%
  • Hold-up time: More than 20ms under rated load
  • Output voltage regulation: Less than ±1% full range
  • Isolation voltage: 2500V AC between AC input and DC output

Material Composition

  • Front panel: Flame retardant metal alloy panel with silk screen printing and ventilation grille
  • Main PCB: FR-4 flame retardant printed circuit board with conformal coating
  • Power conversion component: High frequency switching transformer, power MOSFET
  • Protection component: Fuse, thermistor, voltage clamping diode
  • EMI filter: Inductor and capacitor filter network
  • LED indicator: Industrial high brightness LED
  • Backplane connector: Gold plated power edge connector

Structural Characteristics Ovation dedicated power module form factor. Rear gold plated edge connector connects to rack backplane power bus. Front panel has ventilation grille for forced air cooling, LED indicators and power status test point. Internal layout separates high voltage AC input section and low voltage DC output section with isolation barrier. Built-in thermal conductive structure to transfer heat to front panel.

Working Principle AC input power enters WH1-2FF through cabinet wiring. EMI filter eliminates power grid noise. Rectifier circuit converts AC into DC bus voltage. High frequency switching circuit and transformer convert bus voltage into stable low voltage DC output. Output regulation circuit maintains constant DC voltage under load variation. Protection circuit detects overvoltage, overcurrent or overtemperature condition and shuts down power conversion immediately to protect downstream DCS modules. In redundant pair, two power supplies share rack load continuously.

Installation Requirements

  1. Insert WH1-2FF into dedicated power slot of Ovation rack, push fully and lock front fixing screw.
  2. Connect AC power cable to module input terminal. Use dedicated power wire and secure terminal connection.
  3. Configure power redundancy setting in Ovation engineering workstation when installing dual power supplies.
  4. Perform power on test and voltage measurement after wiring before loading I/O modules.
  5. Ensure cabinet protective grounding is reliable, grounding resistance less than 4 ohms.
  6. Keep ventilation grille clean and unblocked, no dust accumulation on cooling path.

Usage Precautions

  1. Do not open module housing. High voltage exists inside enclosure even after power disconnection.
  2. Do not apply AC voltage outside rated input range. Overvoltage destroys power conversion circuit.
  3. Verify power load capacity before adding more I/O modules into rack to avoid overload.
  4. Disconnect AC input before removing module from rack. Hot removal under live AC input is prohibited.
  5. No field repairable components. Replace whole module upon power supply failure.
  6. Prevent metal debris falling into ventilation grille and rack slot.

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