Emerson WH5-2FF

Emerson WH5-2FF

Product Brief Introduction: WH5-2FF is high capacity Ovation rack power supply module, delivering higher DC output power for Ovation racks with large quantity of I/O modules and controller cards. It converts wide range AC input into regulated DC power for rack backplane bus. It integrates complete protection functions and supports redundant parallel operation. This module supplies power for heavy loaded Ovation control racks in large scale process plants.

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Description

Emerson WH5-2FF

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. High power output to support Ovation racks with dense I/O modules and redundant controllers.
  2. Wide AC input range adapts to unstable industrial plant power supply.
  3. Built-in overvoltage, overcurrent and overtemperature protection with automatic shutdown.
  4. Support redundant parallel configuration for no-break power supply.
  5. Active power factor correction reduces grid harmonic distortion.
  6. Integrated EMI filter to suppress power line interference into DCS backplane.
  7. Front panel LED indicators show input power, output normal and fault alarm states.
  8. Continuous internal health monitoring and fault signal upload to Ovation system.

Application Scenarios Large thermal power plant main control rack power supply, chemical plant large DCS control cabinet, oil refinery main process control rack, large pulp and paper mill DCS cabinet.

Performance Parameters

  • Power conversion efficiency: Greater than 90%
  • Hold-up time: More than 20ms under rated full 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 High capacity Ovation power module form factor. Rear gold plated edge connector connects to rack backplane power bus. Front panel has large ventilation grille for enhanced heat dissipation, LED indicators and test points. Internal layout separates high voltage AC section and low voltage DC section with physical isolation barrier. Thermal sink structure reduces working temperature of power semiconductor devices.

Working Principle AC power enters WH5-2FF and passes EMI filter to remove power noise. Rectifier converts AC to high voltage DC bus. High frequency switching stage and transformer step down voltage to required DC level for Ovation backplane. Feedback regulation circuit stabilizes output voltage under varying load. Protection circuit monitors voltage, current and internal temperature. Fault condition triggers shutdown. In redundant configuration, two WH5-2FF modules share rack load continuously.

Installation Requirements

  1. Insert WH5-2FF into dedicated power slot of Ovation rack, push fully and lock front fixing screw.
  2. Connect AC power cable to module input terminal and tighten terminal screw securely.
  3. Set power redundancy parameters in Ovation engineering workstation when using dual power supplies.
  4. Complete power-on test and DC output voltage measurement before loading I/O modules.
  5. Ensure cabinet protective grounding is reliable, grounding resistance less than 4 ohms.
  6. Keep ventilation grille clean to maintain heat dissipation performance.

Usage Precautions

  1. Do not open module housing. Internal high voltage capacitor stores electric charge after power cut.
  2. Do not apply AC input outside rated voltage range.
  3. Calculate total rack load current before adding I/O cards to avoid exceeding module rated capacity.
  4. Cut off AC input power before removing module from rack. Live hot removal is forbidden.
  5. No field repairable components. Replace whole module upon failure.
  6. Prevent metal debris falling into ventilation grille and rack slot.

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