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AVR - Automatic Voltage Regulator SX440

AVR - Automatic Voltage Regulator SX440

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El AVR SX440 es un regulador de voltaje automático de tipo tiristor de fase media onda, diseñado como parte del sistema de excitación para generadores sin escobillas. Este AVR no solo regula el voltaje del generador, sino que también incluye protección contra pérdida de velocidad y detección para un control seguro y fiable. Sus entradas de detección son versátiles, abarcando rangos de 90-150V (0V-110V), 175-260V (0V-220V) y 350-520V (0V-380V), con una potencia de entrada monofásica de 100-264V CA. Proporciona una salida máxima de 90V CC a 207V CA, con 4 A CC continuos (10 A intermitentes por 10 segundos). Ofrece una regulación de voltaje de <±1% (con motor regulado al 4%), arranque de voltaje residual (>5 V CA), supresión EMI interna y un ajuste de voltaje externo de ±8%. Además, opera eficientemente entre -40°C y 60°C, con una disipación de potencia máxima de 12 vatios.

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AVR - SX440 is the automatic voltage regulator of the generator: it reads the output voltage and corrects the field excitation so the voltage stays stable as the load changes.

A failing AVR shows up before it dies: voltage dips 5–30 V when a large motor starts, lights flicker, or the control panel reboots. When it fails completely the set delivers only residual voltage or trips on overvoltage.

Specifications and compatibility

Applicable to
STAMFORD
Dimensions
17 x 6 x 13 cm
Weight
1.00 kg

How to verify before ordering

  • Check that the reference printed on the AVR label (for example AS440, MX341, R120) matches exactly; variants differ in sensing range and excitation level.
  • Confirm the excitation input voltage and the generator type it serves. They are not interchangeable across generator makes or speed ranges.
  • Inspect wiring and brushes before replacing the module: a loose connection produces exactly the same symptoms as a burnt AVR.

Frequently asked questions

How do I know the fault is the AVR and not the generator?

Measure output voltage at steady load. If it is low and does not respond to the excitation trim, while windings and rotating diodes are healthy, the AVR is the suspect. A cross-test with a spare AVR confirms it in minutes.

Can the voltage be trimmed after installation?

Yes. Most of these regulators have a voltage and a stability trim pot. Set them at no load to the site nominal voltage, then verify under load before signing off.

Related parts

See the spare parts catalogue or request a quotation quoting the equipment reference. Third-party trademarks are cited for identification purposes only.

Specifications

Characteristics
Applicable To STAMFORD
Weight 1,00 kg
Dimensions 17 x 6 x 13 cm
Spare Parts
Generator Parts AVR