PLC power supply failure
Thread Content
During the recent thunderstorm season, the night before yesterday. There is a PLC control cabinet on site. The Mean Well power supply New Well NES-200-24 in the cabinet suddenly lost its 24V output during a thunderstorm. 220V is always present when inputted. So, a new power supply was installed. It's a good idea to take the faulty module back for inspection of the fuse; it also functions normally after being powered on. I wonder if anyone has encountered such a situation
This matter ends up being completely worthless. Induced lightning strikes enter through the power grid, starting from the power supply, and cause a series of equipment instruments to be damaged; this is quite common. .
Lightning strikes are large voltage spikes that last for milliseconds, or even less time. How large are they? Hundreds of thousands of volts, maybe millions of volts...... The time interval is too short; the fuse doesn’t have time to heat up and blow before the lightning strike passes. So it’s normal for the fuse not to burn out in the event of a lightning strike. . .
Grid surges caused by lightning electromagnetic storms lead to automatic power protection or short-term damage. Many electronic components have the ability to repair themselves after suffering an instantaneous overvoltage breakdown, so no fault can be detected afterward. Power supplies that have experienced this will be more prone to problems when faced with surges in the future. Therefore, if it is not due to automatic power protection activation, this power supply should preferably not be used in production equipment anymore.