The circuit problem of the secondary circuit of the motor

KAJ is an anti-trip relay. The current coil with i indicates the anti-hopping relay, and the voltage coil with the v indicates the anti-hopping relay. This anti-hopping relay is an anti-hopping relay that holds the current running voltage.

The meaning of anti-jumping is: when the switch is closed to the fault point, the relay protection action, the switch is removed, if for some reason, the closing command of the switch is not canceled, such as the closing contact is glued, the switch has to be closed, and the protection is jumped away after closing, so that the switch will jump repeatedly. In order to prevent the occurrence of the above-mentioned continuous jumping, measures are taken to prevent the above-mentioned repeated jumping accidents in the operating mechanism of the switch or in the secondary control loop.

A common measure taken in secondary control loops is to install anti-hopping relays. Specifically, to the drawings you provided, when the relay protection action, the K20 33-34 contact is turned on, the K30 coil is energized, the K30 normally open contact is connected to the protection jump switch KAJ (I) coil (i.e. current start), KIM K2S circuit, KAKI's normally closed relay disconnects the closing coil, and no reclosing occurs, and at the same time, the KAJ normally open contact is closed, and the KAJ normally open-KAJ (U) coil-K31-KIM-K30 loop is turned on, keeping the K30X coil without losing power, The K30 normally closed contact is always open, and the closing coil circuit is always disconnected, preventing the switch from jumping.

1.You have to look at whether the coil voltage of your contactor is 380V or 220V. Because the coil has several specifications such as 380V and 220V.

That's what you call the two lines of fire. 220v is what you call a fire and a zero. Do you understand?

What you are talking about refers to the control loop of the low-voltage motor, and the control loop of the low-voltage motor is generally taken from the main circuit A and C as the control loop, which should be determined according to the coil voltage of the contactor. There are also those who take one phase and one earth, that is, you say one fire and one zero. The lines we use in our daily life are single-phase electricity, that is, we take a live wire and take a neutral wire to form a line.

The use of two live wires is two phases, which depends on the nature of the electrical equipment.

Yes, in the first picture, if the trolley is in the two extreme positions, can not stop, will delay and continue to continue according to the running steps you said, because the power on and off of the KMF and KMR coils is determined by the travel switch, and the travel switch also controls the time relay, and it is the time relay that sends power to the circuit again instead of the button, which is the circuit diagram of the automatic reciprocating cycle, if the circuit diagram is not modified, when you want to stop the car and move, you must wait for the reverse (that is, the car leaves the limiter, After the limiter is reset), press the stop button again, and the circuit can stop, see the red line in the figure below

The power supply of the control line passes through the stop button, if the trolley stops at the STA limiter, the limiter acts due to the contact of the trolley, normally closed becomes normally open, and the KMF coil circuit is disconnected (red cross place), and then look at the KTA time relay, which is also the coil circuit of the normally open control time relay of the STA limiter, because the trolley touches the STA limiter, normally open becomes normally closed, so the KTA time relay coil is energized, and the delay is powered by the KMR contactor coil, Therefore, when the car is in the two extreme positions, press the stop button (let go immediately) can not stop.

In the second figure, there are some improvements, the power supply in the control circuit all has to pass through the self-locking contact of the relay, after pressing the stop button, the relay coil loses power, the self-locking contact is disconnected, and the line can not be supplied with power, even if the trolley touches the limiter at that end, the limiter can only act, but there is no electricity in the line, so the KMF and KMR coils will not be electrified.

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The picture is no problem, your analysis is right, this brain teaser you are looking for!

What's underneath the circuit diagram? It doesn't seem to be complete. Give a big picture of the whole picture.

This is the most primitive control method, controlled with a contactor coil.

The landlord and I were led astray by the book's brain teasers.

The content of the secondary control circuit of the motor is shown in the following figure:

You first have to understand the meaning of "interlocking" and "self-locking", and then it is easy to understand, interlocking, that is, the two contactors lock each other, that is to say, your first action then the second can not act, and vice versa, the general connection method is, the closed point of km1 is stringed to the coil of km2, and the closed point of km2 is stringed in the coil of km1, which is interlocking, and self-locking is the contactor is powered by using its own normally open point to lock it so that it can ensure that the coil is energized after the button is released

Don't rush, look at it step by step. First of all, the coil of the relay or contactor KM1 (the one marked as the rectangle of KM1) is energized, is the auxiliary contact of the relay KM1 or contactor closed? (Is there a switch-shaped thing marked km1 nearby?)

This thing is closed), does the closure make the coil of km1 (or the rectangular one) continue to be energized? This is called "self-locking".

It is more convenient to suggest that the landlord send a picture to discuss, or discuss with classmates and teachers, which is the most readily available resource.

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When the start button is released, the contactor is energized by the coil through its own normally open auxiliary contact, which is called self-locking.

When a contactor is energized, the other contactor cannot be energized through its normally closed auxiliary contact, and this mutual restriction between contactors is called interlocking (or interlocking).

This has to be learned slowly, freezing three feet is not a day's cold.

Secondary equipment refers to the equipment that controls, protects, monitors and measures the work of primary equipment. Such as measuring instruments, relays, operating switches, buttons, automatic control equipment, computers, signal equipment, control cables and some power supply devices (such as batteries, silicon rectifiers, etc.) that provide energy for these devices.

Primary equipment (also known as main equipment) is the main body of the power system, which is the equipment that directly produces, transmits and distributes electric energy, including generators, power transformers, circuit breakers, disconnectors, power buss, power cables and transmission lines. Secondary equipment is the equipment that controls, regulates, protects and monitors the primary equipment, including control tools, relay protection and automatic devices, measuring instruments, signal instruments, etc.

You may also understand it this way: as long as the high-current equipment connected on the three wires (UVW L1L2L3 ABC) is a primary circuit, and the other (low-current) connected equipment is a secondary circuit, which plays the main role of power transmission and transformation, and the secondary is the primary circuit for protection, monitoring, control, regulation, etc