The servo control system is a process control system that enables the output of the controlled quantity such as the position, direction, and situation of the block to follow the overall goal (or given value) of the input at will.
So how does Mitsubishi servo motor maintain precise positioning, how to look at its closed-loop control characteristics, today we will talk about it. First of all, let's look at the composition of the AC servo control system, which consists of a servo controller and a Mitsubishi servo motor. Here we will explain the principle of a servo motor drive, which is just an electric actuator. The structure of the controller is similar to that of the main power supply circuit of the soft starter, and the switching power supply goes through the transformer, inverts the power supply, and maintains the conversion from AC → DC → AC.
The input data signal/instruction can be position, rate, torque and other control data signals, matching the three control modes of Mitsubishi servo motor, each control mode is matched with the control of the ring, torque control is current feedback control, rate mode is rate feedback control, and position mode is three feedback control modes (torque, rate, position). The following is an analysis of the three closed-loop control of the position mode:
Triple feedback control for position mode
For example, M expresses AC servo motor, PG means servo motor, outermost means position ring, because we finally control the position (precise positioning), the inner ring is the rate ring and the current ring (torque ring), and the rate loop and the current loop in position mode are used as protection rings to avoid stall control and load to ensure the constant speed operation of the motor and the stability of the motor current. The most important thing is to look at how the position ring ensures that the motor can be precisely rotated to give the viewing angle.
If we give a pulse of 1, then the feedback pulse is 0, the pulse error △p=1, input to the control board, at this moment the drive circuit controls the IPM inverter power supply to cause the SPWM wave driver Mitsubishi servo motor to rotate, note that this SPWM wave and our plc pulse square wave is not the same, when the motor pushes the servo motor to rotate the feedback pulse, at that time △p=0, the motor terminates the output, and 1 pulse is accurately positioned. The process from the outgoing pulse to the receiving feedback pulse is a closed-loop control process, which ensures that the motor can be accurately and accurately positioned, the total number of pulses determines the spacing of precise positioning, and the frequency of the pulse determines the speed ratio of the motor.
|
More on that
|
How to write a holding circuit for Mitsubishi PLC
There is a very common kind of circuit in Mitsubishi PLC - the persistence circuit. The insistence circuit means that when the external input switch is a button, it can be pressed once through the insistence circuit to insist on the output, similar to the self-locking in the electrical diagram. We use Mitsubishi PLC as an example to write a sticking circuit.
...
|
|
Mitsubishi servo system common alarms and solutions
The use of Mitsubishi AC servo system is mainly composed of three series: MR-ES, MR-J2S, MR-J3. In general, the cause of the fault can be preliminarily determined based on the code displayed on the servo drive, and then troubleshooting:
1、AL. E6 - Indicates ...
|
|
The Mitsubishi iQ-F series is compatible with CC-Link IE TSN motion modules
The new iQ-F motion module is a controller that can perform advanced motion control such as positioning, synchronization, cam, speed, torque, etc., with a computing cycle of 500μs, and can be connected to a high-function servo amplifier through CC-Link IE TSN, making a higher contribution to the miniaturization and high functionality of the equipment.
...
|
|
Mitsubishi PLC network structure
1. The equipment layer/fieldbus CC-Link equipment layer is a field network that connects PLC and other control equipment and sensors and drive equipment, which is the low-level network of the entire network system. The CC-Link fieldbus connection is selected, and the number of wiring is greatly reduced, and the system maintainability is improved. Whereas...
|
|
The components inside the inverter are replaced regularly - Mitsubishi inverter
Inverter (Mitsubishi inverter) is composed of many electronic parts, such as semiconductor components, etc., in the application and protection involves the replacement of a related component, because of the composition or physical characteristics of the inverter, it will deteriorate in a certain period of time, thus reducing the inverter's ...
|
|
Introduction to the functions of Mitsubishi's commonly used servo motor series
Mitsubishi servo motor MR-J2S series
1. The product also has RS-232 and RS-422 serial communication function, which can be used for parameter setting, trial operation, status display and gain adjustment through the personal computer installed with servo setting software.
2. Matching with MR-J2S series ...
|
|
What are the main factors of interference in Mitsubishi PLC system?
(1) Radiative dry disturbance from space
The radiated electromagnetic field (EMI) in space is mainly caused by power networks, transient processes of electrical equipment, lightning, radio broadcasting, television, radar, frequency induction heating equipment, etc., generally known as radiation disturbance, and its dispersion is extremely chaotic. ...
|
|
Mitsubishi PLC set and reset command use example
1 SET Directive
The SET instruction is called an enthronement instruction. Its function is: to drive the coil, so that it has a self-locking function, and insists on the connection condition. In the diagram, when the moving contact X0 is closed, the SET command is executed to turn on the Y0 coil. After X0 is disconnected, the Y0 coil continues to insist on the ON condition, ...
|
|
Introduction to Mitsubishi PLCFX3U positioning control
1. The workbench runs in the direction of the decrease of the value of the current value register (generally M8342=OFF in the opposite direction), and when it encounters the near-point signal, it becomes a creeping speed, and the zero-point signal after leaving the near-point signal arrives with a delay of 1ms, and the pulse output is immediately aborted.
...
|
|
The difference between Mitsubishi FX3u and FX5u
Mitsubishi FX3U series PLC is the third generation of miniature programmable manipulators, using a class of programmable memory for its internal storage programs, to execute logic operations, sequence control, timing, counting and arithmetic operations and other user-oriented instructions, and through digital or analog input/output control of each ...
|
|
There is no self-locking reason for the Mitsubishi servo motor to be turned on
In some cases, when the user first touches the use of the Mitsubishi servo motor, it may appear that the Mitsubishi servo motor is not self-locking after it is ready! So, what is the reason for this? And how to deal with it?
...
|
|
There are three major classifications of inverters - Mitsubishi inverters
There are several ways to classify frequency converters:
According to the classification of the main circuit operation method, it can be divided into voltage-type inverter and current-type inverter; According to the classification of switching methods, it can be divided into PAM control inverter, PWM control inverter and high carrier frequency PWM control inverter;
In accordance with the ...
|
|
Mitsubishi servo system failure problem
The origin position is incorrect, and the encoder debugs/zeros the bit
Replacement bearings, bearing groove wear, rotor cracking, shaft cracking
Gear groove wear
The magnet bursts steel, the magnet falls, gets stuck and doesn't move
Encoder wear, code ...
|
|
The difference between Mitsubishi PLC source type and leak type
Mitsubishi PLC split source type (PNP) or drain type (NPN), here are their differences
1: Leakage logic: When the current flows out of the signal input terminal, the signal becomes ON, which is leakage logic. The current flows through the terminals and has the output characteristics of an NPN transistor.
2: Source logic: When ...
|
|
Mitsubishi servo system common alarms and solutions
The use of Mitsubishi AC servo system is mainly composed of three series: MR-ES, MR-J2S, MR-J3. In general, the cause of the fault can be preliminarily determined based on the code displayed on the servo drive, and then troubleshooting:
1、AL. E6 - Indicates ...
|
|
Mitsubishi servo teaches you to choose a good robot
When evaluating which process is suitable for which approach in the production environment, consider the problem you want to solve and consider all the costs that the robot can save: reduce waste, improve efficiency, improve productivity, improve safety, or reduce labor costs. These costs ...
|
|
MITSUBISHI COLLABORATIVE ROBOT MELFA ASSISTA
With the popularization of industrial robots in the production site, more and more Mitsubishi collaborative robots, Mitsubishi robots, MELFA ASSISTA, RV-5AS-D on-site issues need to be solved urgently, such as the need for more robot programming engineers, adding labor costs; The teaching is cluttered, and a large number of non-...
|
|
Self-locking function of servo motor - Mitsubishi
Press the abort button SB1, the contactor KM coil is de-energized, and the auxiliary normally open contact of the KM connected in parallel with SB2 is disconnected to ensure that the KM coil continues to lose power after the button SB1 is released, and the main contact of the KM connected in series in the motor circuit is continuously disconnected and the motor stops. Auxiliary to the KM in parallel with SB2 ...
|
|
PLC is different from each output type
The three output types of PLC are: transistor output, thyristor output and relay output, what is the difference between these three different output types?
(1) Transistor output:
The biggest advantage is that it is suitable for high-frequency action, and the sound ...
|
|
Anti-interference measures for PLCs and touch screens - Mitsubishi PLC
1. Select the power supply with excellent performance and press the disturbance introduced by the power grid
The power supply of the PLC controller is powered by a non-power line, and is powered by a special line directly led by the main bus of the low-voltage distribution room. Isolation transformer should be selected, the transformer capacity should be 1.2-1.5 times larger than the actual need, and can be used in isolation...
|
|
Contact
working hours
