Generator Automatic Voltage Regulator AVR R250 Manual PDF

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Generator Automatic Voltage Regulator R250 AVR (for Leroy somer) controls the excitation current according to the alternator's output voltage. 

With a very simple conception, the shunt excitation alternator is auto excited with a R250 and excitation alternator does not have a short circuit capacity, voltage regulation: around ±0.5%.

Details: http://www.aotchina.com/product/Generator-Voltage-Stabilizer-AVR-R250.html