I have the 24V switch power outlet end of "+" and "-" two, the voltage between the two is 24V, connected with the electrical components of the loop, which "-" it is necessary to connect with the cabinet ground (that is, ground wire) connected? What's the difference between grounding and ungrounded? What kind of influence does the two kind of situation bring to the electric appliance in the actual use? Please help me master the answer!
The switching power supply is the use of modern electronic technology, the control switch turn-on and turn off time ratio, maintain a stable output voltage power supplies, switching power supply from the general pulse width modulation control of IC and MOSFET. With the development and innovation of power electronics technology, switching power supply technology is also constantly innovation.
Is the 24V direct current? Direct current cannot connect with the earth. If the 24V AC is not necessary to connect, if the ground, there is a single-phase grounding fault. So it can't connect with the earth.
In theory, each has its own saying, and in engineering practice, some are grounded, others are not. The negative grounding that I touch can improve stability. Products like SIEMENS are basically grounded like this
This line can connect to the ground. If your cabinet is earthed, this line can be connected to the casing. This line with the earth's role is to prevent differential mode interference. If your device is used in a relatively disturbed environment, such as a large generator around it, this line is best grounded. I have encountered this kind of problem in actual engineering. The power supply above the tower crane is not grounded. When the tower crane is working, especially the switch is used, the contact switch is not the time of the solid state relay. The video monitor system restarts or crashes when the disk is frequently dropped.
Industrial 24V switch power outlet "-" it is necessary to connect with the ground. The negative grounding of the power supply can prevent differential mode interference to a great extent and improve the stability of the circuit.
