AVR - Automatic Voltage Regulator R250
El AVR R250 es un regulador de voltaje automático analógico con transistores, diseñado para controlar la corriente de excitación en alternadores sin escobillas Leroy Somer (series LSA 42.2 a 47.2). Este AVR, que se adapta al sistema de excitación de derivación, garantiza una regulación de voltaje de aproximadamente ±0.5%. Su concepto simple permite una autoexcitación eficiente, aunque el alternador no tenga capacidad de cortocircuito.
El R250 opera con un rango de suministro de 85 a 139 V y es compatible con frecuencias de 50 Hz y 60 Hz, incorporando umbrales de ajuste para diferentes niveles de carga y protección ante variaciones de velocidad y fluctuaciones de carga. Cumple con normativas internacionales como IEC, VDE, NEMA, BS, CSA y UL508 CE de bajo voltaje. Además, cuenta con un potenciómetro para ajustes de voltaje y programas específicos disponibles bajo pedido.
AVR - R250 belongs to the generator excitation circuit and holds the output voltage within about ±1 % when the load steps up or down.
AVR wear is thermal. It works inside the generator compartment with no ventilation of its own, so it is usually the first module to age on a high-hour set. Keeping one on the shelf avoids a multi-day stop for a low-cost part.
Specifications and compatibility
- Applicable to
- LEROY SEMER
- Dimensions
- 170 x 650 x 130 mm
- 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 | LEROY SEMER |
| Weight | 1,00 kg |
| Dimensions | 170 x 650 x 130 mm |
| Spare Parts | |
|---|---|
| Generator Parts | AVR |