A motor used as power source by factory has a relay panels up to recently. But they have the problems of operating and maintenance, such as mechanical contracts, etc. They also need some additional relays to check the over load, over currents and grou...
A motor used as power source by factory has a relay panels up to recently. But they have the problems of operating and maintenance, such as mechanical contracts, etc. They also need some additional relays to check the over load, over currents and ground faults. But in the development of computers the relay panels to control motor are changed by electrical motor controllers with microprocessor or DSP. They can check the event, the over load, over currents and ground faults and also supervise the trend and state of operating. In this paper, a monitoring devices for the control and supervision of motor has been presented and developed.