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ABB SDCS-FEX-1 Excitation Board  

1. Key Parameters

• Product Model: SDCS-FEX-1
• Order Code Reference: Typically paired with small-to-medium power ACS VFD kits (e.g., ACS880-01-025A-7, 3ABD00013042) for procurement
• Product Series: ABB ACS VFD Small-to-Medium Power Synchronous Motor Excitation Boards
• Core Function: Supplies adjustable DC excitation current to small-to-medium synchronous motor field windings; optimizes magnetic field for torque/power factor; enables basic field weakening; monitors excitation system health (overcurrent, overtemperature)
• Excitation Electrical Specifications:
  • Excitation Current Range: 0A~5A DC (continuous); 7A DC (peak, 8s duration for dynamic load spikes)
  • Excitation Voltage Range: 0V~200V DC (adjustable via ACS VFD control signals)
  • Current Regulation Accuracy: ±1.5% of set current (meets precision needs for small motors, e.g., fans, small pumps)
  • Field Weakening Capability: Supports field current reduction to 15% of rated value (enables synchronous motor operation up to 1.2× base speed)
  • Excitation Control Signal: 4~20mA analog input (from ACS VFD; proportional to desired excitation current)
• Control & Monitoring Interfaces:
  • Internal Communication: ABB proprietary interface with ACS VFD control board (e.g., SDCS-CON-2); exchanges excitation setpoints, status, and fault data
  • Feedback Signals:
    • Excitation current feedback (4~20mA; for VFD closed-loop control)
    • Excitation voltage feedback (0~5V; for system monitoring)
    • Field winding temperature feedback (PT100 input; 0℃~120℃ range)
  • Diagnostic Outputs: 1× digital fault output (24V DC; triggers on overcurrent, overtemperature, or field open circuit)
• Electrical Safety Features:
  • Overcurrent Protection: Trips at 7A DC (peak); automatically limits current to 5A continuous
  • Overvoltage Protection: Clamps at 220V DC (prevents damage from voltage transients)
  • Field Open-Circuit Detection: Triggers fault within 200ms (protects against field winding disconnections)
  • Isolation: 2.5kVrms (between excitation circuits and ACS VFD power circuits; prevents ground loops)
• Mechanical Specifications:
  • Form Factor: PCB (Printed Circuit Board) with reinforced mounting holes; compatible with ACS small-power VFD internal chassis
  • Dimensions (W×H×D): 150mm × 100mm × 25mm (compact fit for ACS880-01/ACS580 VFD excitation compartments)
  • Mounting: Screw-mounted (secures to ACS VFD internal chassis; 2 M3 mounting screws)
  • Weight: Approximately 280g
  • LED Indicators (on board edge):
    • Power (PWR): Green (board powered on); Red (power fault)
    • Excitation Status (EXC): Green (excitation current normal); Blinking Green (field weakening active); Red (excitation fault)
    • Temperature (TEMP): Green (field winding temp <80℃); Amber (80℃~100℃ warning); Red (>100℃ shutdown)
    • Fault (FLT): Red (general fault, e.g., overcurrent, field open)
• Environmental Ratings:
  • Operating Temperature Range: -5℃~+55℃ (23℉~131℉; matches small-power ACS VFD operating environment)
  • Storage Temperature Range: -40℃~+85℃ (-40℉~185℉; no component degradation)
  • Humidity Tolerance: ≤90% RH (non-condensing, 40℃; suitable for damp light industrial settings)
  • Vibration Resistance: 10~500Hz, 1g acceleration (IEC 60068-2-6; no solder joint failure)
  • Shock Resistance: 15g acceleration (11ms duration, IEC 60068-2-27; maintains structural integrity)
• Compliance Standards: IEC 61800-5-1 (adjustable speed drive systems), EN 61000-6-2 (EMC immunity), UL 508C (industrial safety), CE, RoHS

2. Key Features

• ACS VFD Exclusivity: Custom-engineered for small-to-medium power ABB ACS VFDs (e.g., ACS880-01, ACS580)—ensures plug-and-play integration with VFD control boards and power modules; eliminates compatibility risks from generic excitation boards (e.g., current mismatch, communication latency).
• Precision Excitation Control: ±1.5% current regulation accuracy and 0A~5A adjustable range provide stable magnetic field strength—ideal for small synchronous motors (e.g., 5kW~30kW fans, 10kW~40kW pumps) where consistent torque and power factor are critical for energy efficiency.
• Basic Field Weakening Support: Enables synchronous motor operation up to 1.2× base speed by reducing excitation current to 15% of rated value—suits applications requiring moderate speed variation (e.g., variable-speed water pumps, light-industrial compressors).
• Comprehensive Fault Protection: Integrates overcurrent (7A peak), overvoltage (220V clamp), field open-circuit, and temperature protection—shuts down excitation safely in abnormal conditions (e.g., loose field wiring) to prevent damage to small synchronous motors (which are often more sensitive to excitation faults).
• 2.5kVrms Isolation: Industrial-grade isolation between excitation circuits and VFD power systems protects sensitive control electronics from ground loops and voltage transients (common in light industrial grids)—ensures stable excitation even near small motors or low-voltage equipment.
• Real-Time Temperature Monitoring: PT100 input for field winding temperature detection triggers warnings (amber LED) and shutdowns (red LED) at critical thresholds—prevents thermal damage to small motor windings (which have less heat dissipation capacity than large motors).
• Compact & Lightweight Design: Small form factor (150mm×100mm×25mm) and 280g weight fit perfectly in small-power ACS VFD chassis—saves internal space and simplifies installation in compact control cabinets (e.g., wall-mounted VFDs for workshop equipment).

3. Application Fields

• Small-to-Medium ACS VFD Synchronous Motor Control: Primary application—powers excitation for ACS-driven small motors:
  • Light Manufacturing: Regulates excitation for 10kW~25kW synchronous motors driving workshop conveyors (ACS580 VFDs); precise current control ensures consistent conveyor speed, reducing product jams in assembly lines for small parts (e.g., electronic components).
  • Water & Wastewater Treatment: Supplies excitation for 5kW~30kW synchronous water pumps (ACS880-01 VFDs); basic field weakening adjusts pump speed to match variable water demand, optimizing energy use in small treatment plants.
• Moderate-Speed Industrial Equipment: Supports motors with moderate speed needs:
  • HVAC Systems: Controls excitation for 8kW~20kW synchronous fan motors (ACS580 VFDs) in commercial buildings; stable magnetic field maintains fan efficiency, while temperature monitoring prevents overheating during summer peak load.
  • Light Industrial Compressors: Regulates excitation for 15kW~40kW synchronous compressors (ACS880-01 VFDs) in food processing facilities; power factor optimization reduces reactive power draw, lowering electricity costs for small-scale production.
• Legacy Small Motor System Upgrades: Modernizes older setups:
  • Workshop Retrofits: Replaces obsolete excitation modules in legacy 5kW~25kW synchronous motor systems (e.g., old lathes, small mills); integrates with new ACS580 VFDs, extending equipment lifespan without full motor replacement.
  • Renewable Energy Auxiliaries: Controls excitation for small synchronous motors in solar/wind auxiliary systems (e.g., 10kW~20kW cooling fans for solar inverters); wide temperature range (-5℃~+55℃) adapts to outdoor inverter enclosures.

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