???
???
More Information would be nice here are a couple of observations
what size breaker did you install? Is it sized at 125%, or 250% of the nameplate fla, also you indicated that this is a 230v-3ph motor are you running this motor on a 208v system if so what size conductors and what length of wire, basically what is the voltage at the motor if you voltage at the motor terminals is too low due to any voltage drop this might be causing your problem if I remember correctly the motor is rated plus / minus 10% and the voltage is allowed to flucuate from 10% plus / minus in combination with the utility and building power if that is the case and the 230V motor requires 207V and the low end to operate if you are on a 208v system and you are getting 200-207 volts this could be the porblem as the system will be allowed to drop as low as 187.2v (10%) a 200v class motor might solve your problem, also check the breaker / conductor size, just my opinon.