Is it okay to use PLC to control the motor without speed control? What are the consequences? 20

PLC has many functions, can control the start and stop of any motor, can control complex control loops.

Using a PLC (Programmable Controller) to control a frequency converter to control a motor can bring several advantages:

Flexibility: The combination of PLC and inverter can flexibly realize a variety of different control strategies, such as timing start and stop, reverse rotation, speed control and so on. At the same time, the PLC itself can also be controlled and judged by logic through Ranling programming, making the entire control system more intelligent and automated.

Reliability: PLC has high reliability and stability, which can monitor and protect the running status of the motor to avoid equipment failure and safety accidents. In addition, the PLC can also communicate and transmit data, which can easily realize remote monitoring and control, and improve the reliability and production efficiency of the equipment.

Energy-saving: The use of inverter can realize the speed control of the motor and reduce the operating power of the motor, so as to achieve the purpose of energy saving. This section can be controlled by PLC to achieve more refined control according to specific needs, minimize energy consumption, and improve the economic benefits of the equipment.

In short, the use of PLC control inverter to control the motor can improve the flexibility, reliability and energy saving of the equipment, while achieving a more intelligent and automated production process, improving production efficiency and economic benefits.

PLC (Programmable Logic Controller) is a programmable electronic device commonly used in industrial automation control systems. The advantages of PLC control speed control system are as follows:

1.Programmability: PLC can be programmed to control the speed control system according to needs, with high flexibility and can adapt to different industrial application scenarios.

2.Stability: The PLC control speed control system can achieve accurate control and ensure the stability and reliability of the equipment operation.

3.Scalability: PLC can be expanded with multiple input and output modules to meet different control needs.

4.Easy to maintain: The PLC control speed control system has a simple structure and is easy to maintain and repair.

5.Wide applicability: PLC control speed control system is suitable for various industrial application scenarios, including machinery, electronics, chemicals, pharmaceuticals and other fields.

In short, PLC control speed control system has the advantages of programmability, stability, scalability, easy maintenance and wide applicability, and is a widely used technology in industrial automation control systems.

In the case of PLC controlled motor, there is no speed signal, and the following fault phenomena usually occur:1The control circuit is not turned on:

The control circuit is not turned on, causing the motor to not work properly. 2.Incorrect power cord connection:

Incorrect connection of the power cord may cause the motor to not work properly and the speed signal may be missing. 3.Problems with the motor itself:

Problems with the motor itself, such as motor damage, winding failure, etc., can also lead to a missing speed signal. 4.Sensor failure:

If the control circuit works normally, the motor can also be started, but the speed signal is still missing, then it is necessary to check whether the sensor is faulty, which may be caused by the damage of the sensor spring wide circuit or the fault of the sensor itself. To deal with this kind of failure, we need to carry out systematic investigation and maintenance. The car can first check whether the PLC program is operating normally, check whether the power cord is connected correctly, and then check whether the motor is faulty.

In the event of a complex fault, you can also seek a professional electrical maintenance personnel to bypass it.

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I hope to help you <> the following answers for your queries

If the PLC control motor does not have a speed signal, the following fault phenomena may occur:1The motor fails to start or stops immediately after starting; 2.

The speed of the motor is unstable, and the pants are returned or fluctuated; 3.The RPM value read by the PLC is inaccurate or 0. These failures can be caused by:

1.Insufficient power supply or power failure of the motor; 2.The motor is incorrectly wired; 3.

There is a fault in the motor itself; 4.Damaged or failed encoder; 5.There is a problem with the connection of the PLC input port or the PLC itself is faulty.

In view of these faults, Wang He can investigate them one by one and repair or replace them accordingly. At the same time, it is recommended to regularly inspect and maintain the motor and PLC to ensure the normal operation of the equipment. Sleepy pure digging.

If you use the DP bus, you don't need to connect these lines, and what is the function depends on what kind of speed change effect you want to achieve now, a few speeds or a range of variable speeds.

The wiring of this kind of hardware is also right, but it is generally not drawn like this. If you take DP, you can use the DP network cable directly, and you don't need to use a cable to connect, which are two methods. Graduation ** It is recommended to use this kind of school, so that it is convenient for the judges to ask questions.

In the above figure, add an analog output to control ain1 to control the frequency of the inverter.

1. It is the software output address of the PLC module.

3. The above figure is the wiring method of the hardware.

4. If you take the DP fieldbus, you will not be able to control it through these IO points 5. If you want to achieve speed change in the above figure, you should also set the relevant parameters of the inverter. The wiring in the above figure can only achieve multi-stage speed regulation.

What Building 2 said is already very clear, do as he says.

1. Add DC governor.

2. The PLC control system is a new generation of industrial control devices formed by introducing microelectronic technology, computer technology, automatic control technology and communication technology on the basis of the traditional sequence controller, which is used to replace the sequence control functions such as relay, execution logic, time keeping, and counting, and establish a flexible program control system. It has the characteristics of strong versatility, easy to use, wide adaptability, high reliability, strong anti-interference ability, and simple programming.

3. Electric machinery (commonly known as "motor") refers to an electromagnetic device that converts or transmits electrical energy according to the law of electromagnetic induction. In the circuit it is indicated by the letter M (D in the old standard).

Its main function is to generate driving torque, as a power source for electrical appliances or various machinery. Generators are denoted by the letter G in the circuit. Its main role is to utilize electrical energy to convert into mechanical energy.

Of course not, it is not necessary to add a DC governor, and the encoder is not necessary.

First of all, please understand that PLC only has three types of output: relays, transistors, and thyristors, and these three types can only have some driving components, because PLC only outputs some control signals, and the main reason is that the current is small. So if you want to control the speed regulation of the DC motor, you need a suitable driver board.

As for the rotary encoder, it plays the role of a feedback signal, which is generally a pulse signal, which can be received by PLC, and the speed and distance can be obtained after PLC conversion.

Yes. However, I don't know if there is a special control pulse. can be controlled.