Electrician Forward Switch Reverse Connection Diagram
The following are the situations related to the electrical positive and reverse switch connection diagram: ** I. Single-phase motor (crane) reversing switch connection ** 1. ** Characteristics of the motor ** - The single-phase motor (used for cranes) has two entries and four exits. The two entries are the zero fire line, and the four exits are the motor wires. The running capacity in the motor could be regarded as non-existent on the drawing. 2. ** Principle and Connection ** - The forward and reverse rotation of the motor was achieved by adjusting the direction of the bridge between the main winding and the secondary winding. - The main winding is connected to the U2 terminal of the pile head of the motor, and the secondary winding is connected to the U2 terminal of the pile head of the motor through the series connection of the series connection. The four terminal posts of the reversing switch controlled the cross change of the main winding and the secondary winding through the change of the cross connection and the parallel connection, thus controlling the forward and backward rotation of the motor. K1.2 was the switch that was turned off in the middle, while K3 was turned off in the middle and turned on on both sides. ** Two, three wire small motor positive and negative transfer method ** 1. ** Connection Steps ** - Use a Multimeter to switch to the resistance level, and then randomly measure the two connecting resistances with the largest resistance. Then, find the one with the smallest resistance and connect it to 220V. If there was a situation where the resistance was the same, he could try different combinations of wires to achieve positive and negative rotation. For example, if the red and yellow wires were connected, the motor would rotate clockwise (clockwise). If the red and green wires were connected, the motor would rotate counterclockwise. ** 3. Universal Change-over Switch to Control the Positive and Negative Connecting Lines of the Single-phase Small Electric Machinery ** 1. ** Universal Change-over Switch Status ** - Take the three-section 12-terminal universal switch as an example. 2. ** Connection Method ** - The input terminal 1 - 7/3 - 5/9 - 11 was connected to the three-phase ADC power supply, and the 2 - 4/6 - 8/10 - 12 was connected to the three-phase motor (although it was used for single-phase small motor, the terminal was similar). For a single-phase small motor with a single capacity, the middle terminal is connected to the neutral line at the common end, and the other end is connected to the 10 and 12 of the universal switch. The two wires on both sides were connected to the two ends of the transformer, and the other side was connected to the 2 and 4 on the universal switch. To control the forward and reverse rotation of the single-phase motor, only four sets of contacts needed to be selected. For example, 1 and 3 were short-circuited together to connect to the live wire, 2 and 4 were connected to both ends of the single-phase motor, 9 and 11 were short-circuited together to connect to the neutral line, and 10 and 12 were short-circuited together to connect to the common end of the motor. ** 4. Forward and Reverse Switch Connection ** 1. ** Connection at the bottom ** - At the bottom of the button switch, there were two wires connected to the power supply and four wires connected to the single-phase motor. The number 1 to 4 on the motor should correspond to the number 1 to 4 on the switch. 2. ** Principle of Forward and Reverse Rotation ** - Press the forward button, and Line 1 on the switch will be connected to Line 3, Line 2 will be connected to Line 4, and the motor will rotate forward; press the reverse button, and Line 1 on the switch will be connected to Line 2, Line 3 will be connected to Line 4, and the motor will rotate in reverse. If the direction of the motor is inconsistent with the direction indicated by the switch, the No. 1 line on the motor can be moved to the No. 2 line, the No. 2 line to the No. 4 line, the No. 4 line to the No. 3 line, and the No. 3 line to the No. 1 line. ** 5. Three-phase nine-contact switch and single-phase motor connection ** 1. ** Connection Points ** - Draw two power wires and four wires to connect to the motor. Just match the number with the motor number. After the switch was bought back, it had to be connected with a copper coin at a specific dotted line. ** Six-phase, three-phase, ten-point positive and reverse switch connection ** 1. ** Connection Points ** - The two points marked with dotted lines had to be connected with copper coins, and the rest was similar to what had been explained before. Read more exciting novels for free
Electrician exam positive and negative circuit diagram and connection diagram
The following are the principles of the motor positive and negative circuit diagrams and connection diagrams involved in several common electrical examinations: ** I. Contactor interlocked motor reversing control circuit ** 1. ** Principle ** - Forward rotation control: Turn on the power switch Q, press the forward start button SSB2, and the coil of the contactors KM1 will be energized and pulled in. At this time, the main contact is closed to connect the motor to the power supply, and the normally open auxiliary contact is closed to realize self-locking (even if the SSB2 button is released, the KM1 coil is still energized). The motor M is rotating in the forward direction. At the same time, the normally closed auxiliary contact of the KM1 was disconnected, which prevented the power supply of the contactors KM2 (realizing the interlocked, preventing the two contactors from being energized at the same time and causing short-circuit and other faults). At this time, the phase sequence of the power supply connected to the motor was A-B- C. - Reverse rotation control: If you want the motor to change from forward rotation to reverse rotation, first press the stop button SSB1, so that the forward rotation circuit is cut off (the KM1 coil loses power, the main contact is cut off, the normally open auxiliary contact is cut off, and the normally closed auxiliary contact is restored to be closed), and then press the reverse start button SSB3. The KM2 coil is energized and attracted, and its main contact and the normally open auxiliary contact are closed, so that the motor can rotate in reverse. At the same time, the normally closed auxiliary contact of KM2 was disconnected to prevent the contact KM1 from being energized. At this time, the phase sequence of the power supply connected to the motor was C-B- A. To stop the electric motor, press the stop button SSB1. 2. ** Connection diagram key points (illustration)** - The main circuit part: the three-phase power supply is connected to the fuse (for protection), then connected to the main contacts of the contactors KM1 and KM2, then connected to the thermal relay (for overload protection), and finally connected to the motor. Among them, the main contact connection of KM1 and KM2 must ensure the correct switching of phase sequence during forward and reverse rotation. - The control circuit part: connect the stop button SSB1 (normally closed contact) from the power lead. The other end of SSB1 is connected to the forward start button SSB2 (normally open contact) and the reverse start button SSB3 (normally open contact) respectively. The other end of the SSB2 is connected to the coil of the contactors KM1, and the normally closed auxiliary contact of the KM2 is connected in series on this line to realize the interlocked connection; the other end of the SSB3 is connected to the coil of the contactors KM2, and the normally closed auxiliary contact of the KM1 is connected in series on this line to realize the interlocked connection. The normally open auxiliary contacts of the contactors KM1 and KM2 are respectively connected in parallel with their respective start buttons to realize the self-locking function. ** 2. Double interlocked reversing circuit ** 1. ** Principle ** - This circuit combined a button interlocked with a contactors interlocked. The button interlocked was achieved through the circuit design of the forward start button SSB2 and the reverse start button SSB3, and the contactors interlocked through the normally closed auxiliary contacts of KM1 and KM2. The advantage of this design was that it could directly switch the direction of the motor, which improved the convenience and safety of the operation. 2. ** Connection diagram key points (illustration)** - The main circuit is similar to the control circuit of the positive and negative rotation of the interlocked motor. - Control circuit part: on the basis of the interlocked contactors, the normally closed contacts of the forward start button SSB2 and the reverse start button SSB3 are respectively connected in series to the starting circuit of the other party to achieve button interlocked. For example, the normally closed contact of the SSB2 is connected in series in the circuit connecting the SSB3 and the KM2 coil, and the normally closed contact of the SSB3 is connected in series in the circuit connecting the SSB2 and the KM1 coil. ** 3. Automatic shuttle control circuit (an application of the motor's forward and backward rotation)** 1. ** Principle ** - After switching on the power switch QL, press the start button (similar to the forward start button), the contactors KM1 will self-lock, and the trolley will start to move forward. When the limit switch SQ1 was touched, the KM1 coil lost power, the KM2 self-locked, and the trolley ran in the opposite direction. As long as the stop button was not pressed, it would cycle. 2. ** Connection diagram key points (illustration)** - The main circuit part was also a three-phase power supply to the motor through the fuse, the main contact of the contactors, and the thermal relay. - Control circuit part: In addition to the control circuit of the positive and reverse contactors KM1 and KM2 (including interlocked), it also needs to be connected to the travel switch SQ1 and SQ2 (used to control the positive and reverse limits respectively). For example, in the forward operation, the KM1 self-locking circuit is connected in series with SQ2 (normally closed contact). When the trolley touches SQ2, the KM1 coil loses power; in the reverse operation, the KM2 self-locking circuit is connected in series with SQ1 (normally closed contact). When the trolley touches SQ1, the KM2 coil loses power. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How to draw the forward and reverse ladder diagram and circuit diagram
The following is a basic method to draw a positive and negative ladder diagram and circuit diagram: ** 1. Confirm control requirements and I/O allocation ** 1. ** Clear control requirements ** - Usually, the forward and reverse control required the motor to rotate forward, reverse, and stop through buttons, and it had to be interlocked with forward and reverse (to prevent short circuits caused by forward and reverse rotation at the same time). It might also require thermal relay for overload protection and other functions. 2. **I/O allocation confirmed ** - ** Inputs **: For example, the start button for forward rotation, the start button for reverse rotation, the stop button, and the overload protection signal of the thermal relay are all used as input signals. These input signals should be distributed to the corresponding input terminal of the PC. For example, in the case of the Mitsui PC, it may be X000, X001, etc., and in the case of the siemen PC, it may be I0.0, I0.1, etc. - ** Outputs **: Forward Contactor Coils and Reverse Contactor Coils are used as the output devices. They should be connected to the corresponding output terminal of the PC, such as Y000 and Y001 of the Mitsubishi-based PC, Q0.0 and Q0.1 of the SIEMEN-based PC, etc. ** 2. Draw the circuit diagram (Take the three-phase induction motor as an example)** 1. ** Main circuit part ** - The three-phase power supply was connected to the fuse (for short-circuit protection) and then connected to the main contact of the contactors. For forward rotation, when the main contact of the forward rotation contactors (KM1) is closed, the three-phase power supply is connected to the motor according to the normal phase sequence, and the motor is rotated forward. For reversal, when the main contact of the reversal contactors (KM2) is closed, the phase sequence of two phases of the three-phase power supply is reversed and then connected to the motor, and the motor is reversed. At the same time, the thermal relay (FT) should be connected to the circuit to detect the current of the motor and automatically cut off the circuit when overloaded. 2. ** Control Circuit ** - ** Forward control circuit **: Lead out from one end of the power supply, first connect the stop button (normally closed), then connect the forward start button (normally open) and the auxiliary normally open contact (for self-locking) of the forward rotating contactors (KM1) in series, then connect the auxiliary normally closed contact (for interlocked) of the reversing contactors (KM2) in series, and finally connect to the coil of the forward rotating contactors (KM1). The other end of the coil returns to the other end of the power supply. - ** Reverse control circuit **: It is also led out from one end of the power supply. First, connect the stop button (normally closed), then connect the reverse start button (normally open) and the auxiliary normally open contact of the reversing contactors (KM2) in series (for self-locking), then connect the auxiliary normally closed contact of the forward rotating contactors (KM1) in series (for interlocked), and finally connect to the coil of the reversing contactors (KM2). The other end of the coil returns to the other end of the power supply. - ** Overload protection part **: The normally closed contact of the thermal relay (FT) is connected in series to the common part of the control circuit (i.e. behind the stop button). When the motor is overloaded, the thermal relay will act, and the normally closed contact will be disconnected, cutting off the entire control circuit. ** 3. Draw the ladder diagram (Take the SIEMens's PL as an example)** 1. ** Forward Rotation Control Logics ** - I0.0 is used as the input signal of the forward start button, I0.1 is used as the input signal of the stop button, I0.2 is used as the input signal of the reverse start button (all are normally open contact input), Q0.0 is used as the output signal of the forward contact coil, and Q0.1 is used as the output signal of the reverse contact coil. - When I0.0 is pressed (the normally open contact is closed) and I0.1 is not pressed (the normally closed contact is closed) and Q0.1 is not energized (the normally closed contact is closed), Q0.0 is energized and self-locked (the normally open contact of Q0.0 is closed to maintain its energized state). - In the ladder diagram, it is represented as: the normally closed contacts of I0.0 and I0.1, the normally closed contact of Q0.1 are connected in series to the coil of Q0.0, and the normally open contact of Q0.0 is connected in parallel with I0.0 to achieve self-locking. 2. ** Reverse control logic ** - When I0.2 is pressed (the normally open contact is closed) and I0.1 is not pressed (the normally closed contact is closed) and Q0.0 is not energized (the normally closed contact is closed), Q0.1 is energized and self-locking. - In the ladder diagram, it is represented as: the normally closed contacts of I0.2 and I0.1, the normally closed contact of Q0.0 are connected in series to the coil of Q0.1, and the normally open contact of Q0.1 is connected in parallel with I0.2 to achieve self-locking. The specific instructions, component representation, and programming rules of different brands of PDLCs (e.g., Samsung, SIEMENS, etc.) may differ, but the basic control logic and design ideas are similar. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Positive and Reverse Double Interlock Circuit Diagram and Connection Diagram
The double-interlocked positive and negative rotation control circuit includes a double-interlocked contactors and buttons. The following are its main components and functions: 1. Air switch (QL): used to switch on and off the power supply. It has short-circuit, serious overload and undervoltage protection functions. 2. Fuse (FO): for short-circuit protection. 3. Contactor (KO): Able to frequently switch on and off large currents. Has arc extinguishing function and also has undervoltage protection function. 4. Thermo relay (FT): Overload protection. 5. Push button (SS): Control the start and stop of the circuit. The working principle was as follows: 1. Forward rotation control: press down the SSB2, the SSB2 normally closed contact will first break the KM2 interlocked (cut off the reverse rotation control circuit), the KM1 coil will be energized, the KM1 self-locking contact will close and self-lock, the KM1 main contact will close, the KM1 interlocked contact will break the KM2 interlocked (cut off the reverse rotation control circuit), and the motor will start to rotate continuously forward. 2. Reverse rotation control: press down on SSB3. SSB3 normally closed contacts will be cut off first. KM1 coil will lose power, KM2 coil will be energized, KM2 self-locking contacts will be closed and self-locking contacts will be closed. KM2 main contacts will be closed, and the KM2 interlocked contacts will be cut off and interlocked with KM1 (cutting off the forward rotation control circuit). The motor will start to rotate continuously. 3. Stop: No matter in the forward or reverse working state, as long as you press the button, the entire control circuit will lose power, the contactors will reset, and the motor will stop running. In terms of connection: 1. First, label the blueprint, and then connect the actual object according to the blueprint. In the case of unfamiliarity, it was best to connect the secondary line one circuit at a time. 2. The circuit could be checked by the buzzing bar of the Multimeter, which was also a resistance bar that could measure the resistance of the coil of the contact. It should be noted that in order to ensure safety and normal operation, the graphic symbols and text symbols of each component must be accurately understood during operation and connection, and their structure and functions must be mastered. At the same time, it was necessary to accurately grasp the concepts of electrical self-locking (relying on the normally open electric shock of the contactors to keep its coil energized), electrical interlocked (only one of the two contactors was allowed to be energized at the same time), and mechanical interlocked (only one of the two contactors was allowed to work through a pair of normally open and normally closed buttons). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The principle diagram of the motor's forward and reverse rotation swing
The principle of the three-phase induction motor's forward and reverse swing: The three-phase induction motor has three-phase winding, and the voltage of each phase winding is 120° different. When three-phase symmetrical alternating current is introduced into the three-phase winding of the stators, a rotating magnetic field is generated, and an induced current is generated by cutting the winding of the rotators. Under the effect of the rotating magnetic field of the stators, the conductor of the current carrying rotators generate electromagnetic force to form an electromagnetic moment to drive the motor to rotate, and the direction of rotation of the motor is the same as the direction of the rotating magnetic field. To achieve positive and reverse control, you only need to switch any two phases in the power supply phase sequence (such as keeping phase B unchanged and switching phase A and phase C), and make the connection on the top port of the contactors consistent, and phase adjust the lower port of the contactors. For the single-phase motor, the principle of positive and negative rotation swing: Single-phase motor is generally powered by single-phase AC power supply (AC220V). There are two-phase winding on the stators, and the rotor-type is ordinary squirrel cage. The starting winding is added to the stators. The starting winding and the main winding are separated by 90° in space. The starting winding is connected in series with a suitable capacity, so that the current of the starting winding and the main winding are separated by approximately 90° in phase, thereby generating a rotating magnetic field to make the rotor-to-start operation automatically. When the direction of rotation needs to be changed, the L wire ends of the main and auxiliary winding can be reversed to realize reverse operation. In terms of the motor reverse rotation control circuit schematics: - In the relay control circuit, such as the three-phase induction motor forward and reverse control circuit, KM1 and KM2 are AC contactors that control forward and reverse operation respectively. Two start-stop protection circuits are used to control the forward and reverse rotation of the motor respectively. When the forward rotation start button is pressed, the corresponding contactors coil is energized and the motor is rotated forward. The forward and reverse contactors will not be energized at the same time through the interlocked (including the interlocked contact of the normally closed contact of the contactors and the interlocked button). It was the same for reversal. - In the control system of the PC, the external connection diagram and the ladder diagram achieved similar functions. There was also a start-stop circuit to control the positive and negative rotation, and there were interlocked measures to prevent simultaneous output. In addition, in order to avoid the instantaneous short-circuit fault caused by the delay of the induction, the delay during the forward and reverse switching can be used (but it will increase the programming workload and cannot solve all short-circuit accidents). At the same time, in order to prevent the three-phase power short-circuit accident caused by the electric arc fusion welding when the main contact of the contactors is cut off due to the excessive current of the main circuit or the quality of the contactors, a hardware interlocked circuit composed of the auxiliary normally closed contacts of the contactors should be set outside the PC. The thermal relay was used for overload protection. The thermal relay with different reset functions (manual reset or automatic reset) had different contact connection methods. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reverse Connection Diagram of Single-phase Electric Machine
The following are several types of single-phase motor reverse connection methods: 1. For a motor with two identical winding and three-terminal connection (1/3 is the common terminal of the two winding, connected to L of the AC power supply, and 2/4 terminal is connected with the starting capacity), if the N terminal of the AC power supply is connected to terminal 2 for forward rotation, then N is connected to terminal 4 for reverse rotation. 2. For the agricultural single-phase motor (the main/secondary winding is different, there are four terminal: 1/2 for the main winding, 3/4 for the secondary winding), the two copper plates can be connected vertically to achieve reversal (the starting capacity, CPR, is connected between V2 and Ce, the running capacity, CPR, is connected between E and Ce, and the live line and neutral line are connected). 3. Another method was to cut the wires to connect to T1 and T2 of the reversing switch, and the other one was short-circuited to L1 and L2. The wires connecting U1 and W1 were also cut to connect to L3 and T3, and then connected to 220V alternating current to achieve reversal. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Diagram of Positive and Negative Rotation Circuit for Electrician Operation
The circuit diagram of the motor consists of two parts: the main circuit and the control circuit. Principle of the main circuit: After the three-phase power supply passes through the fuse, it is divided into two paths to the main contacts of the two contactors. The phase sequence of the main contacts of the contactors corresponds to the power supply. The main contacts of the two contactors were connected in parallel after being swapped, then connected to the thermal relay, and finally connected to the motor. For example, when the KM1 main contact is connected, the power supplies L1, L2, and L3 flow to the first phase, the second phase, and the third phase of the three-phase motor respectively, and the motor is rotated in the forward direction; when the KM2 main contact is connected, the power supplies L1, L2, and L3 flow to the third phase, the second phase, and the first phase of the three-phase motor respectively, and the motor is rotated in the reverse direction. By controlling the main contacts of the contactors 1 and 2 to turn on and off, the forward and reverse rotation of the motor can be realized, and to control the main contacts of the contactors, the coil needs to be controlled. Also, it should be noted that the main contacts of contactors 1 and 2 cannot be closed at the same time, otherwise the power supply will be short-circuited. Control circuit principle: 380V single-phase voltage is converted into 36V safety voltage through a transformer to supply power to the control circuit. The 36V power supply first passed through the thermal relay and the stop switch, then reached the forward button, reverse button, and the normally open KM1 and KM2 respectively. If the forward rotation button SSB1 is pressed, the current will reach the KM1 coil through the normally closed SSB1 and KM2. At this time, the KM1 coil will be energized, and the KM1 main contact will be connected to the motor for forward rotation. At the same time, the KM1 is normally open to connect both ends of SSB1 to realize self-locking, and the KM1 is normally closed to prevent the reverse button SSB2 from being short-circuited by mistakenly pressing it. When the stop button SSB3 is pressed, the KM1 coil is cut off, the KM1 main contact is disconnected, and the motor stops running. The KM1 is normally open and loses its self-locking. If the reverse rotation button SSB2 is pressed, the current will reach the KM2 coil through the SSB2 and the KM1 normally closed. At this time, the KM2 coil will be energized, and the KM2 main contact will be connected to the motor to rotate in reverse. At the same time, the KM2 will be normally open to connect both ends of SSB2 to realize self-locking, and the KM2 normally closed and disconnected will prevent the forward rotation button SSB1 from being pressed by mistake to short circuit. When the stop button SSB3 is pressed, the KM2 coil is cut off, the KM2 main contact is disconnected, and the motor stops running. The KM2 is normally open and loses its self-locking. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
k21 three-phase induction motor forward and reverse circuit connection
This isn't related to the novel, but I can briefly tell you the key points of the positive and negative circuit connection of the three-phase induction motor. Three-phase induction motor to achieve positive and negative transfer line, mainly by changing the phase sequence of the motor three-phase power supply to achieve. Generally, two contactors would be used. The three-phase power supply of one of the contactors would be connected in the normal order, such as A-B- C. The three-phase power supply of the other contactors would be changed to C-B- A. In terms of the control circuit, it should be interlocked to prevent the two contactors from short-circuiting at the same time. However, this was just a simple introduction. The actual connection must be strictly in accordance with the electrical safety regulations. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Diode Reverse Circuit Diagram Test
Fish Tank Reverse Lifting Diagram
You only mentioned the " fish tank reverse water lifting principle diagram ", but you didn't give me any detailed information about the principle diagram, such as a description of the principle, introduction of the components, and so on. This way, I can't integrate and polish it. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>