The contact system is the actuator of an electrical appliance, and it functions to open and close the circuit. Therefore, the quality of the contacts directly affects the working performance of the entire appliance. There are many types of contact mechanisms, and according to their contact types, th... read more
The synchronous speed of the motor n = 60 f / P. When the grid frequency f is fixed, n is inversely proportional to the number of pole pairs P. If the number of pole pairs P can be changed, then n will also change. Pole-changing speed regulation is only applicable to cage asynchronous motors. Multi-... read more
The contactor is an automatic electromagnetic type electric appliance, which is suitable for frequently connecting and disconnecting AC and DC main circuits and large-capacity control circuits over long distances. It is mainly used in automatic control of AC and DC motors, electric heating equipment... read more
The essential difference between a programmable controller and a traditional relay control system is the use of the scanning mode and the concept of a relay. PLC system design includes two parts: hardware design and software design. The design method of parallel development of hardware and software ... read more
1. Short-circuit protection When a short circuit occurs, the main circuit is cut off by the fuse of the fuse FU. In order to expand the protection range, the fuse is as close to the power supply as possible in the line, and is generally installed directly under the knife switch. 2. Overload protec... read more
