Mr Sesam, I'm sure the 3 phase were already disconected (there was a moment when all the 2 relays are off, this means the motor is totaly disconected)



Mr Sieraad, I'm very interested in your experience. It seems there are many similarity in our case.To be more percise, the motor is used to lift something heavy from one floor to another (in 4 story house, and not used to lift human). In each floor there is a button to call the box (which is used to lift something)and also a limit switch that tell the mcu , the box has already arrived.

the push button and the limit switch work only to input 5 v DC to the input port of the mcu (when it is pressed, 5v is conected to the mcu)
Mr Sieraad, You solved the problem by changing the method of inputting data,
could you tell me the detail please??



thanks



ridwan