Diagram of Forward and Reversing Control Circuit of SIEMEN Inverters
Taking the SIEMENS MM440 as an example, the circuit structure and working principle of the forward and reverse control circuit of the frequency changer are as follows: 1. ** Circuit components and functions ** - ** Button-related ** - BUB1 button: used to power up the frequency changer. - BUB2: It is used to cut off the power of the frequency changer. However, when it is running, this button will not work due to the blockage of the running relay KA1 or KA2. Pressing this button during running is ineffective. - BUB3: Control the motor to start in the forward direction. - [BUB4: Control the motor to start in reverse.] - BUB5: Realizing the motor stop function. - ** Relays ** - KA1 relay: responsible for forward rotation control. - KA2 relay: responsible for reverse rotation control. KA1 and KA2 are interlocked. The forward and reverse rotation cannot be directly switched. The engine must be stopped before changing the direction. - ** Others ** - When the protection function of the frequency changer is activated, the power supply can be quickly cut off through the KO Contactor, and it is convenient to realize self-locking and interlocked control. 2. ** Circuit Design Points ** - The main function of the KM contactors was to control the power supply of the frequency changer. The operation and stop of the frequency changer were not controlled by them. During operation, the power-off button SSB2 is blocked by the operation relay KA1 or KA2. Contactor KO can quickly cut off the power supply when the protection function of the frequency changer is activated, and it can also realize self-locking and interlocked control. - The control circuit is connected to the alarm output contacts 18 and 20 in series. When the frequency changer fails and alarms, the control circuit is cut off, and the KM is disconnected, thus causing the frequency changer to stop. - The main command button is used to turn on and off the frequency changer and to control the forward and reverse operation of the motor. 3. ** Forward and reverse control of the frequency changer ** - ** Forward Rotation ** - After pressing down on SSB1, the KM coil was energized, the main contact was connected, and the frequency changer was energized into standby mode. At the same time, the auxiliary normally open contact of the KM made the KM coil self-lock. When he pressed down on SSB3, the coil of KA1 was energized, and its normally open contact KA1 was connected to the DIN1 terminal of the frequency changer, and the motor began to rotate forward. The other normally open contact of the KA1 is closed to realize the self-locking of the KA1 coil. The normally closed contact is broken, and the KA2 coil cannot be energized. - ** Reversal ** - If you want to reverse the motor, you need to press the SSB5 to stop the motor. Then, he pressed down on SSB4, and the KA2 coil was energized. The normally open contact KA2 was closed, and the REV terminal of the frequency changer was connected. The motor rotated in reverse. At the same time, the other normally open contact of the KA2 is closed to cause the KA2 coil to self-lock. The normally closed contact KA2 is disconnected, and the KA1 coil cannot be energized. - ** Stop ** - When it is necessary to cut off the power, first press down on SSB5 to make the KA1 and KA2 coil lose power. The normally open contacts are cut off (the motor decelerates and stops), and the bypass power supply to SSB2 is removed. At this time, press down on SSB2, and the frequency changer will be cut off. When the fault alarm of the frequency changer was triggered, the control circuit was cut off, and the main circuit of the frequency changer was cut off. Read more exciting novels for free
Circuit diagram of time control for forward and backward rotation of the motor
The following is a circuit diagram of a motor reverse rotation time control: As for the physical connection diagram, there was a problem with the control of the two AC contactors. The control requirement was to press the self-locking button SSS, and the motor would run clockwise (forward) for 35 seconds, counterclockwise (reverse) for 30 seconds, and then the motor would run forward for 35 seconds, and so on. Press the button SSS again, and the motor would stop running. A simple loop control circuit could be controlled by a relay. In the teaching materials, the symbol of an energized delay relay could be used to replace the double delay time relay, and a pulse counter (its function was the same as the double delay time relay) could also be used to replace the simulation. The double delay loop interlocked time relay used two independent time relay T1 and T2 to be interlocked to form a loop closing and opening working mode. The delay time of T1 and T2 was set independently. With the choice of time base, it could be set freely within a certain range. In a three-phase induction motor control system, KM1 and KM2 were AC contactors that controlled forward and reverse operation respectively. In the ladder diagram, two start-stop circuits were used to control the forward and reverse rotation of the motor. Pressing the start button for forward rotation, the corresponding input point X0 turned ON, and its normally open contact was connected. The coil of Y0 was "energized" and self-protected, so that the coil of KM1 was energized, and the motor began to rotate forward. Press the stop button, and X2 will turn ON, and its normally closed contact will be disconnected, causing the Y0 coil to "lose power" and the motor to stop running. In the ladder diagram, the normally closed contacts of Y0 and Y1 were connected in series with each other's coil (this was called "interlocked" in the relay circuit). At the same time, a "button interlocked" was also set, which was to connect the normally closed contact of the reverse start button X1 in series with the coil of Y0 that controlled the forward rotation, and connect the normally closed contact of the forward start button X0 in series with the coil of Y1 that controlled the reverse rotation. This setting can achieve positive and negative rotation control and ensure that the coil of KM1 and KM2 will not be energized at the same time. For the positive and negative transfer wires of the three-phase motor, press the forward rotation button circuit control button SP2, the KM1 coil, and the KM2 normally closed contact. The power is connected, and the forward rotation coil is energized to start the motor. At the same time, the normally closed contact of the KM1 is disconnected, and the KM2 coil connected in series cannot be connected. Press the reverse rotation button circuit control button SSB3, the KM2 coil, and the KM1 normally closed contact. The power is connected, and the reverse coil is energized to start the motor. At the same time, the normally open contact of the KM2 is disconnected, and the KM1 coil connected in series cannot be connected. These were part of the circuit diagram principles involved in the motor's forward and reverse rotation time control circuit. <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>
Countdown program circuit diagram
We can find some information about the circuit diagram of the countdown program. For example, document [2] mentioned the use of Logisim software to design the circuit schematics of the countdown circuit. The 30-second countdown design based on the 74LS192 was mentioned in document [3], which included the circuit diagram of the countdown timer. The countdown circuit diagram was also mentioned in document [4]. However, there was no specific circuit diagram for the countdown program. Therefore, we can't answer the question of the countdown program's circuit diagram accurately.
Live camera circuit diagram
You only mentioned the " live camera route map ". If there's no more content, I can't integrate and polish the recommendations according to the requirements. You can tell me more about this route map, such as the special design of the route map, the route map for a specific live camera, and so on. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Mono bass circuit diagram
The following are the component parameters of a monophonic power amplifier circuit diagram made with the LM1875T: Resistance: 1M, 22K, 1K, 20K, 1R; Condenser: 2.2UA (best to use an infinite audio), 0.1UA, 100UA, 22UA, 0.22UA. The LM1875 chip's pin function was in the shape of five pins, of which pin 1 was the in-phase signal input, pin 2 was the in-phase signal input, pin 3 was the negative power supply-Vee(single power supply ground), pin 4 was the signal output, and pin 5 was the vcc-input. The standard circuit could be assembled according to the components in the circuit, and there was no need to adjust it. However, this was only a basic example of the power amplifier circuit. For the bass effect, the component parameters in the circuit may need to be further optimized or the circuit may be improved according to specific needs. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Diode Reverse Circuit Diagram Test
Single-Chip Coupled Circuit Diagram
As for the single-chip coupled circuit, in some electrical control products, the input circuit part involved coupling-related content. For example, when the various control signals of traditional electrical equipment are converted into digital signals that match the input/output port of the single-chip computer, the control signals input by the user equipment to the single-chip computer (such as the switch output of the limit switch, the operation button, etc.) are converted through the input circuit, where the input circuit has a coupling-related function. There was also the circuit diagram of the optical coupler-driven relay in the circuit of the single-chip drive relay. The optical coupler-driven relay played a role in the circuit, but the specific circuit diagram needed to be consulted in special documents, such as the circuit diagram of the optical coupler-driven relay (optical coupler/UL2803/switch circuit) and other related information. In addition, the document on the design method of the commonly used drive and coupled circuit of the single-chip I/O for the characteristics of electrical control products may have more detailed design content about the single-chip coupled circuit, but it did not directly give a detailed circuit diagram. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Simulation circuit diagram of the single-chip computer
The following are several examples of simulation circuits related to single-chip processors: - In the ESP32 and Arduino single-chip simulation (such as the website of the website, the simulation circuit that lights up the LED light needs to add an LED light and a current limiting resistance. The negative pole of the LED lamp was connected to the GND pin of the single-chip development board, the positive pole was connected in series with the current limiting resistance, and the other end of the current limiting resistance was connected to the No. 2 pin of the development board. - For the simulation circuit of the steering gear control, add the steering gear in the hardware circuit (the steering gear has three pins, namely, the voltage regulator, the voltage regulator, and the voltage regulator. The voltage regulator is connected to the negative pole of the power supply, and the voltage regulator is connected to the positive pole of the power supply). Then, connect the steering gear to the single-chip computer (if you use the Arduino single-chip computer, you can choose a pin with a "~" to output the voltage regulator signal. In this project, pin 3 is selected as the voltage regulator output pin). - If the simulation uses L298 to drive the direct current motor, the circuit includes the L298N chip (this is a dedicated driver integrated circuit, belonging to the H bridge integrated circuit), the display part uses the PG 160128A (the liquid crystal display dot matrix is 160X128), the input device is a 4X4 matrix keyboard, and it may also include measurement tools such as a virtual scope. The positive and negative rotation of the motor can be controlled by the P1.0 pin of the single-chip computer. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How to program the positive and negative reversing circuit of the mitsui plc
Taking the mitsui fx3u series plcs as an example, the programming method to realize the positive and negative rotation control of three-phase induction motor (positive and negative rotation switching can be directly switched without stopping, and the equipment has overload protection and short circuit protection. When switching direction, the positive running direction will immediately stop, and the target direction will automatically run after 2 seconds) is as follows: ** I. Remodeling the CPU to distribute IOs ** First, determine the I/O distribution (specific table content is not given here). ** II. Diagram of electrical circuit for the modification of the Plc ** The power supply is controlled by the externally connected QF, the short-circuit protection is realized by the Fu1 and Fu2, and the overload protection is realized by the FT thermal relay. ** 3. Control program modified by the Plc ** 1. ** Realization using the basic instruction OUT (Program 1)**: The specific program content is not given, but the corresponding program logic can be written using the basic instruction OUT to control the forward and backward rotation according to the control requirements. 2. ** Realization using set and reset (Program 2)**: The detailed program was also not given, but according to the functional principle of set and reset, the program was written under the control logic of positive and negative rotation. For example, when the forward rotation button is pressed, the output point related to the forward rotation is set, and when the reverse rotation button is pressed (considering the logic relationship such as the ineffectiveness of pressing the reverse rotation button during forward rotation), the corresponding setting and reset operation is performed to realize reverse control. 3. ** Realization with MOV instruction (Program 3)**: The exact program content is also not given. The program logic needs to be built according to the characteristics of the MOV instruction and the control requirements of forward and backward rotation. During programming, it was also necessary to consider specific control requirements such as the ineffectiveness of pressing the reverse button during the forward rotation of the motor, the stop and delay start during the forward and reverse rotation switching, and reasonably arrange the program logic to accurately control the forward and reverse rotation of the motor. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Analysis of the Circuit Diagram for Measuring the Reverse Characteristic of Diode
In the circuit diagram for measuring the reverse characteristics of the circuit, the circuit was connected in the reverse direction, that is, the positive pole of the power supply was connected to N, and the negative pole was connected to P. In this connection method, the direction of the external electric field was the same as the direction of the internal electric field of the junction, which would strengthen the internal electric field, making the thickness of the depletion layer wider and the space charge larger. This made it more difficult for the holes in the P region and the free electrons in the N region to pass through the junction, and the current was greatly reduced. At this time, the current through the junction was mainly drift current. Since the concentration of minority carriers does not change when the temperature is constant, the reverse current does not change with the applied voltage within a certain range. This current is called the reverse saturation current. In the measuring circuit, by changing the size of the variable resistance, the reverse current flowing through the LED under different values of terminal voltage could be measured, thereby depicting the reverse characteristic curve of the LED. From the perspective of the V-A characteristic curve of the LED, the bottom left part is the reverse characteristic part, which can be used to analyze the relevant data and phenomena in the reverse characteristic measurement circuit of the LED, such as the reverse breakdown voltage and other parameters. When the reverse voltage exceeds a certain value, the reverse current will suddenly increase, and this voltage value is the reverse breakdown voltage. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>