Circuit Diagram of Motor Long Motion Control

Figure 2-2 shows the circuit that uses the self-locking of the dynamic closing contact of the contactor itself to ensure the long-term control of the motor. The circuit adds self-locking contacts of SB2 and KM on the basis of inching control circuit.

If the thermal relay is not installed in the circuit, it becomes a contactor self-locking control long-acting circuit; If a thermal relay is added (as shown in the dotted box in the figure), it becomes a contactor self-locking long action control circuit with overload protection.

(1) Start control

When the start button SB1 is pressed, the coil of AC contactor km is powered on and closed, and its dynamic closing contact is closed for self-locking, so as to provide three-phase AC for the motor to power on and run. Due to the self-locking effect of KM contact, when SB1 is released, the control circuit remains connected and the motor M continues to operate. Therefore, this circuit is called the motor long-term action control circuit.

(2) Stop control

When shutdown is required, press the stop button SB2, the KM coil is powered off and released, the dynamic contact of KM is disconnected, and the motor stops running because of loss of power supply.

(3) Protection control

In the control circuit with contactor self-locking function, it also has motor voltage loss and undervoltage protection functions.

Loss of voltage protection is also called zero voltage protection. In the control circuit with self-locking, in case of power failure (e.g. fuse fusing), the self-locking contact will be disconnected, and the coil of contactor km will be powered off. Without re pressing the start button SB1, the motor will not start automatically. In the control circuit with contactor self-locking function, after the control circuit is connected, if the power supply voltage drops to a certain value (generally below 85% of the rated value), the magnetic flux generated by the contactor coil will be weakened, the electromagnetic suction will be reduced, the moving iron core will be released under the action of the reaction spring, the self-locking contact will be disconnected and lose the self-locking function, at the same time, the main contact will be disconnected and the motor will stop, Achieve the purpose of undervoltage protection.

The Usage Distinction Between Via and Pad When Protel Designs PCB
With regard to "via cover oil" and "via window opening" (the usage distinction between via and pad), many customers and design engineers often ask what this means when placing an order on the system, and which option should I choose in my document? This issue is explained as follows:        We often encounter such problems. The design is seriously non-standard, so we can't distinguish between pad and via. Sometimes the conductive hole is treated with pad attribute, and sometimes the keyhole is treated with via attribute. The design of via attribute and pad attribute is confused, resulting in wrong processing. This is also one of the problems that often complain. For circuit board production plants, when processing CAM data, Some film processing engineers will make mistakes because the customer's design documents are not standardized. They help the customer modify the documents, make the non-standard design right, and process the engineering data with their own experience, which leads to and contributes to the customer's non-standard design. Jieduobang hereby explains that what you did right last time does not mean that your documents are right! All engineers must pay attention to the design standards and specifications! Jieduobang will again strictly require all film processing engineers to maintain the status quo of customer documents as much as possible! Try to deal with it according to the design specifications and standards, not according to the so-called experience! Reflect the problems, so as to make a reference for all design engineers, improve the design quality and reduce the occurrence of problems!      This article mainly explains the conductive hole, keyhole, and the connection between Protel / pads / and Geber files. Conductive hole: via keyhole: pad is particularly prone to several problems: first, the mixed use of pad and via leads to problems. 1. When your file is pads or Protel, send it to the factory and ask for hole cover oil. Pay attention to it. You should carefully check your plug-in hole (PAD) Is it also useful for via? Otherwise, green oil will be applied to your plug-in hole, resulting in the inability to weld. The dispute points: the plug-in hole must be sprayed with tin. How can you cover the oil and how can I use it? Please check the documents when saying this, whether it is designed by pad or via!      When your document is pads or Protel, send the document to the factory, and the order requires via cover oil. Many customers use pad (plug-in hole) to represent the conductive hole, which leads to the opening of your conductive hole. Maybe what you want is via cover oil. At that time, the dispute may be that what I want is via cover oil. Why did you open the window, Please check your document design!Again, if you are via, press via. If you are pad, press pad! Because no one will know that you are a conductive hole, that is a plug-in hole, and via and pad are the only signs. Please be clear!      During the conversion process of via, problems are caused by non-standard design or unclear Gerber setting rules. When you send Gerber files, the factory can't distinguish which are through holes and which are keyholes. The only thing that can be identified is processing according to the file, which is helpful for welding layer and opening windows! Dispute point: you open the window for me now. I may cause a short circuit. Please check your file. The Gerber you sent out is a film file. The factory has no way to check whether you have a conductive hole or a keyhole. Please check the Gerber file to see if there is a welding aid layer. If there is any, open the window and cover the oil. III How to design the oil of the through hole cover in Protel or pads—— This is the most standard practice. If the design standard is, there will be no mistakes!      In the via attribute of Protel, there is a holding option. If it is checked, it must be oil capping, and all you transfer out are oil capping. In pads, the oil capping method of holes (via) is to be considered when transferring pads to files: when outputting soldermask, i.e. solder resist layer, just check the upper soldermask top - lower via, which represents all through-hole windows, If you don't check it, you can use the oil on the cover of the through hole. To sum up: pad is made according to pad, which is the plug-in hole. Via, you have two choices. If you provide the original file, you can choose it when placing an order. If you provide Gerber file, you must check whether the Gerber file meets your requirements!
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