Have you ever encountered such a bad thing as a friend who is a factory equipment operation and maintenance and a first-line electrician? 

The production line was running with orders, and the switching power supply of the equipment suddenly went on strike and stopped. I was 

in a hurry to repair it, but I couldn't figure out the root cause of the failure. I changed it to a new one and it broke down in two months. It 

cost a lot of money to toss the parts back and forth, which also delayed the production progress. Many people think that the switching 

power supply is just a small accessory. If it is broken, it can be replaced directly. However, frequent failures are often not quality problems, 

but the details of use and selection are not paid attention to, and small problems drag on big losses.

Today, I will teach you the troubleshooting methods of these three high-frequency faults, so that you can quickly locate the problem by 

yourself, spend less money and delay production.

The first high-frequency fault: frequent burning of safety and explosion of the machine when it is turned on. Many people's first reaction is 

to buy less power. In fact, the high probability is that there is a hidden short circuit at the load end, or the starting impact of the inductive 

load exceeds the threshold. Inductive loads, such as servo motors and solenoid valves, will generate more than 3 times of impulse current 

at the moment of starting, far exceeding the rated value of power supply, and it is easy to directly breakdown internal components. Practical 

troubleshooting method: firstly, measure the load output end with a multimeter to confirm whether there is short circuit or leakage; Check 

the load type again. If the inductive load accounts for a high proportion, the rated power of the switching power supply should be at least 

2-3 times, so don't stick to the rated power. If it is a factory with many power grid surges, it is recommended to use it with surge protector, 

which can reduce the impact damage by more than 80%.

The second high frequency fault: unstable output voltage and poor load capacity. When the equipment is lightly loaded, it is normal. When 

it is fully loaded, the voltage drops and the equipment restarts. Many people think that it is a virtual standard of power supply. In fact, most 

of them are caused by heat dissipation failure or excessive input voltage fluctuation. In order to save space, many factories plug the switching 

power supply in a closed and narrow electric control box, which has poor ventilation and slow heat dissipation, and the performance of internal 

components will be greatly reduced at high temperature, and the carrying capacity will naturally shrink. Practical troubleshooting methods: 

touch the power supply shell when it is in trouble. If it is too hot to touch, give priority to troubleshooting the heat dissipation problem. Don't 

squeeze multiple power supplies into a closed space, and reserve ventilation and heat dissipation space; Re-measure the on-site input voltage. 

The night voltage of the old factory area is easy to be high, which is beyond the rated input range of the power supply. It should be replaced by 

an industrial switching power supply with wide input model to adapt to voltage fluctuation.

The third high-frequency fault: life decay and frequent problems in half a year. Obviously, I bought an industrial-grade power supply, and its 

performance declined in less than a year, mostly because the environment was not properly adapted. In dusty, humid and corrosive workshop, 

the switching power supply of ordinary PCB bare board is easy to accumulate dust and dew, resulting in internal short circuit and corrosion of 

components, and the service life is directly halved. Practical inspection method: disassemble the power supply and look inside. If there are obvious 

traces of dust accumulation and condensation, it means that the environment adaptation is wrong. In the dusty and humid workshop, the switching 

power supply with waterproof glue is preferred, and the protection level is at least IP65; The conventional drying workshop should also be cleaned 

once every six months, which can not only prolong the life, but also find hidden dangers in advance.

In the final analysis, although the switching power supply is a small accessory, it is the power supply heart of the whole set of industrial equipment. 

If you don't pay attention to small faults, it will easily lead to large production losses. Mastering the basic troubleshooting methods can not only  

quickly repair and reduce downtime, but also select the right model to reduce long-term operation and maintenance costs.

If you need type selection and transformation, you can consult Baoweite for the scheme. Thank you for browsing. You can collect official website of 

Shenzhen Baoweite Power Supply Co., Ltd.