In general, most commercial generators can be converted from 60 Hz to 50 Hz. The general rule of thumb is 60 Hz machines run at 1800 Rpm and 50 Hz generators run at 1500 Rpm. With most generators changing the frequency will only require turning down the rpm’s of the engine.  In some cases, parts may have to be replaced or further modifications made.  Larger machines or machines already set at low Rpm are different and should always be evaluated on a case by case basis.  We prefer to have our experienced technicians look at each generator in detail in order to determine the feasibility and what all will be required.