Hello everyone. I know that a nameplate that reads 208-230V and 60Hz means that the motor is optimal at 230V, with degraded performance at 208V. Just because the motor has 208-230V on the nameplate, does not mean that it is good for 10% below 208V. The 10% above and below rule would apply to the 230V portion of the nameplate, and not the 208V portion. If the nameplate read 208/230 instead of 208-230, then it is an entirely different ballgame. That being said, what if the name plate read 208V-230V and 50/60Hz? Is the optimal motor voltage 230V for 50 and 60Hz? If it were just a 60Hz motor, and I were derating it for 60Hz, then I would think the 208V would be the optimal voltage and it should maintain good performance in a 10% band around 208V. To sum up my question, does the voltage range on a nameplate that reads 208V-230V for a 50/60Hz motor mean that the optimal voltage for 50 and 60Hz operation is 208V (degraded performance) 230V (optimal performance.) Thanks for taking the time to answer this question.
