Hello everyone, I am a veteran in automation with over 20 years of experience. Today, let’s discuss a practical topic: how to control inverters with PLCs to achieve soft start and speed regulation of motors. I remember last year when I worked on a renovation project at a cement factory. Their conveyor belt motors were … Read more
This article introduces the working principle of a classic microcontroller power circuit, as shown in the figure below. Initial State (Power Off) Before the circuit is powered on, the “TEST” switch is open, and the MCU is not powered by VCC. At this time, the base of transistor T1 is grounded through R9 (100k), keeping … Read more
Three-phase asynchronous motors commonly use star-delta soft start; this control circuit is one of the typical motor starting control circuits. Previously, relay-contactor control was used, but with the emergence and deeper application of PLCs, PLCs are now generally used for control. Due to the high cost of PLCs, commonly used control circuits do not have … Read more