150 KW 480 three phase generator. Whats largest size mtr. it can start with cross the line starter? Largest size mtr. with soft start.?? Largest size motor with VFD. I;m looking for a place I can refer to for this info. Thanks yoopersup
The formula is: Motor HP x KVA per HP x (1000 / (Volts x 1.73)) = LRA. Example: A 20 HP Code G motor connected to 460 Volts requires what LRA? Refer to Chart A and select 6.29 KVA/HP, from Chart A, for Code G. The formula becomes: 20 x 6.29 x (1000 / (460 x 1.73)) = 125.8 x 1.26 = 158.5 = 159 LRA. The generator must produce 159 Amps at 460 Volts, to safely start this motor. Use formula: 1.73 x Volts x Amps x .8 / 1000 for generator KW size. Found it! heres part of it harts for mtrs. also on it.