"Cold mix" electrician technical experience sharing
I believe that the majority of electrician counterparts have accumulated certain technical experience in the long-term practice process. Today, I share three experiences that I summarized in my daily work. As there are three different aspects involved, and “cold dishes†are Because of the similarities and differences in work, it is called as an electrician's experience "cold."
1. Among the electrical control circuits that do not require high general protection functions, we often use thermal relays, which are the most common protection devices, to protect the motor from overload (some types of thermal relays also have a phase failure/phase loss protection function). We often use the auxiliary normally-closed contacts of the thermal relay in the control loop, but have you ever thought about the other pair of normally-open contacts? In fact, this group of normally open contacts is used to access the "fault" signal indicator. I do not know if everyone has used this pair of contacts when connecting the line?
2. Some of the peers in the selection of cables consider that the heavier the cable quality is, the better the quality is. In fact, this kind of psychology is often used by some unscrupulous merchants. The cables produced by them are heavier than other similar products. However, once they are stripped of the insulating layer, they will be surprised to find that the insulation layer of the cable is very thick. , but very few copper wires are used! After all, the use of cheap plastic products or even recycled plastic products to replace copper wire is still very cost-effective.
"Cold mix" electrician technical experience sharing
3, part of the electrician counterparts may also be encountered in the work - the motor needs to be switched from the frequency conversion operation to the frequency of operation, and then converted from the power frequency conversion operation. However, if this kind of circuit is not properly designed, unexpected failures will often occur. It is entirely possible for the motor to be directly switched from the variable-frequency operation state to the power-frequency operation. This has little effect on the motor and the inverter. Copyright diangon.com. When the motor can be directly switched from the power frequency operation mode to the variable frequency operation mode, since the motor is initially in the mechanical inertial operation state during this process, the motor enters the generator operation mode at this moment. If the motor is directly connected to the inverter, the motor is generated. The voltage must be sent back to the inverter, plus the output voltage of the inverter will form a very high voltage! At this point, the inverter will be protected against shutdown, and the inverter will be damaged by high voltage shocks. Therefore, in this case, the switching operation must be performed after the motor is stationary.
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