DATAKOM AVR-4A Voltage Regulator

DATAKOM AVR-4A is (Original) and made in Turkey. It is a compact automatic voltage regulator used to maintain the voltage output of synchronous alternators within specified limits. It achieves this by controlling the excitation current to the alternator’s rotor. The AVR ensures stable performance under varying load conditions, making it ideal for industrial, commercial, and residential applications.

(Note: Bulk quantity pricing often differs from unit prices.)

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Description

DATAKOM AVR-4A is a compact automatic voltage regulator used to maintain the voltage output of synchronous alternators within specified limits. It achieves this by controlling the excitation current to the alternator’s rotor. The AVR ensures stable performance under varying load conditions, making it ideal for industrial, commercial, and residential applications.

Specification:

Input Specifications:

  • Sensing Voltage: 170–250 VAC, single-phase (derived from the alternator output).
  • Frequency Range: 50 Hz or 60 Hz (automatic frequency sensing or manually adjustable).

Output Specifications:

  • Output Voltage: Up to 100 VDC (depending on alternator specifications).
  • Maximum Current: Typically up to 4 Amps (check datasheet for exact current rating).
  • Excitation Power: Suitable for brushless or brushed alternators.

Control Adjustments:

  • Voltage Adjustment: Fine-tuning voltage through an external potentiometer or built-in adjustment knobs.
  • Stability (Damping) Adjustment: Ensures smooth response under load changes.
  • Under-Frequency Roll-Off (UFRO): Reduces excitation at low speeds to protect the alternator.
  • Over-Voltage Protection (OVP): Prevents excessive voltage on the alternator’s field winding.

Protection Features:

  • Overload and short-circuit protection for the excitation circuit.
  • Automatic under-voltage and over-voltage shutdown.
  • Over-temperature protection in certain models.

Operating Environment:

  • Operating Temperature: -40°C to +70°C.
  • Humidity: Up to 95% non-condensing.
  • Mounting: Panel-mounted or within the alternator housing.

Function:

Manual Voltage Adjustment:

  • Potentiometers allow the operator to set and fine-tune the desired output voltage.
  • Can also accept an external remote voltage adjustment input.

Frequency Sensing:

  • UFRO adjusts excitation at lower frequencies (below nominal speed) to prevent over-excitation.

Dynamic Response:

  • Stability control adjusts the damping level to ensure the generator responds appropriately to sudden load changes without excessive oscillations.

Applications:

  • Diesel or gas generator sets for industrial and residential use.
  • Power stabilization for sensitive electrical equipment.
  • Standby power systems.
  • Generators in marine and mobile applications.

Installation:

  • Wiring: Connect the AVR sensing input terminals to the alternator output terminals (phases). The excitation output terminals should be wired to the field winding.
  • Polarity: Ensure the correct polarity of excitation terminals to avoid system malfunction.
  • Potentiometer Adjustments:
    1. Voltage: Set the desired output voltage.
    2. Stability: Adjust to avoid oscillation or instability.
    3. UFRO: Adjust the frequency threshold where the AVR reduces excitation.

Common Faults and Troubleshooting:

No Output Voltage:

  • Check alternator connections and excitation circuit wiring.
  • Ensure the AVR input voltage is within the rated range.

Fluctuating Voltage:

  • Adjust the stability (damping) control.
  • Check for loose connections or poor grounding.

Voltage Too Low/High:

  • Adjust the voltage potentiometer.
  • Verify alternator speed is within nominal range.

Excitation Circuit Overload:

  • Inspect for short circuits or excessive load on the alternator.

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