Originally Posted by
foreigneRS
his requirement seems quite clear to me
he wants to control the speed of a couple of 240V motors with a PID loop so that they maintain a speed necessary to achieve an output on some kind of 0-5V sensor
well perhaps you could translate for us lesser mortals then?
firstly, controlling the voltage of a 230 ac motor *may* or *maynot* have any impact at all upon its speed / torque. depending on the motor type that you want to control, you might be better off converting the ac to dc to start with or other types of motors rely alomost entierly on the ac frequency. need more information!