How to

The purpose of a generator set is to transform the energy in the fuel used by the prime mover into electrical energy at the generator terminals. Since nothing is perfect, the amount of energy input is ALWAYS greater than the amount of energy output, resulting in an efficiency that is ALWAYS less than 100 percent.

Every fuel has a basic "heat value": this is usually broken down into two cases. The first case uses a LOW value that corresponds to the assumption where the water vapor c ...

If there is no name plate, you won't be able to know the rated voltage too. In that case, you may have to guess the approx. HP depending upon the size of the motor, select appropriate auto transformer and then run at no load by slowly increasing the voltage till it reaches steady state. I am however still not sure if this will give you the correct rated voltage. There are standard ratings of three-phase 380V, 415V & 440V. I do not know if differentiation between these is possible, because ...

If you choose a NEMA contactor, you choose a size greater than the full load amps FLA. You must derate if you have frequent starts, or jogging duty.

If you choose an IEC contactor, you need to consult the tables on expected life when you size based on FLA.

Now you need to select what type of overload relay you want. Bi-metallic or electronic, manual or automatic reset? Choose the rating based on the directions for what you choose.

If you are placing the cir ...