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it seems there is a mechanical problem with the load,it has a worn drive shaft which wont allow it to reach its equired speed due to the counterweight assemblies used,so fingers crossed should be rectified as soon as the parts arrive,would have been easier to diagnose if the manufacturer had not...

thanks for the advice,after some more thorough checks it would seem that the load has become the main point of issue,the motor seems to be doing its job,it starts and runs up to a set speed but trips due to excessive currents, according to the sceen manufacturer it should be at least 55kw...

that was a thought,its hard to eliminate the load though as its such a heavy machine to turn over and judge if its tight but thanks

hi there,i have a problem with a 45kw squirrel cage motor running on a 415v supply,it runs a quarry screen which is quite a high initial inertia,it has always been started dol with a by pass contactor arrangement for the first 10 seconds of starting to short out the overload module to enable...