1. The starting torque that makes the mechanical equipment roll from the stationary state is usually positive, and generally larger than the torque required to maintain constant velocity movement, such as most feeders, material conveyors, mixers, mixers, etc., it may reach the additional torque of the Yuanyuan Yuyao Yuanyuanyu, which requires the inverter to have a large starting torque.
2. Acceleration torque: The torque required to accelerate the mechanical equipment from the beginning of rolling to the extra speed is the sum of the mechanical static resistance torque and the dynamic torque, and the dynamic torque is proportional to the flywheel torque GD2 and the required acceleration. Mitsubishi Programmable Controller
Generally, the acceleration torque of fans and pumps is not large, and it can not exceed Yuanyuan Yuanyu. But there are also some special cases, such as the GD2 of high-power fans is very large, and it is difficult to speed up; When the centrifugal pump opens the valve, the accelerated torque can reach Yuanyuanyu, and the pump of other modes may reach Yuanyuan or greater; When rolling mills and other steel mills require the acceleration time to be shortened as much as possible, the larger the acceleration torque is required, the better, and the decentralization of heavy objects may make the acceleration torque negative.
3. Peak load torque in constant speed operation, which is an unavoidable normal situation in the production process. For example, when an ore crusher hits a large lump of ore, the electric motor needs to output a large amount of power (current) to help crush. Because this is a normal situation, the motor cannot be tripped over current, which requires the inverter to output a large current. The frequency of such spike loads is difficult to estimate in advance.
The speed at the same speed can be an additional speed, or it can be a very low creeping speed, such as when the carriage is close to the platform, the ropeway is running at a very low creeping speed. If the heavy car is going uphill, it may be overloaded, which requires the inverter to output a large current at low speeds. If it is a heavy car crawling downhill, it is a negative torque.
4. Deceleration torqueIn most cases, the motor current can be decelerated and parked, only in the case of strict requirements for deceleration, the motor output or input energy is required, and the output energy is consumed in the resistance, or fed back to the power grid, which should be decided according to the size of the feedback energy and frequency. When a heavy object is lowered and a large deceleration is required, a large deceleration torque is present and is negative. Of course, there are also occasions where positive torque deceleration is required.
|
More on that
|
Mitsubishi PLC's six programming languages
(1) Ladder diagram
Programming language is traditionally called a ladder diagram. The ladder diagram follows the method of relay control circuit, and it can also be said that the ladder programming language is simplified from the symbol evolution on the basis of the logic control of relays and contactors commonly used in electrical control systems.
|
|
Mitsubishi PLC and inverter are communication methods
The output point and COM point of PLC (MR type or MT type) are directly related to the STF (forward rotation engine) of the inverter. overflow-wrap: break-word !important; ">. RH (high speed), RM (medium speed) important; overflow-wrap: break-word !important; ">、R ...
|
|
Mitsubishi inverter overload fault judgment method
1. Check whether the three-phase electricity of the motor is balanced
(1) If the three-phase voltage of the motor is unbalanced, then check whether the three-phase voltage at the output end of the Mitsubishi inverter is balanced.
(2) If the three-phase voltage of the Mitsubishi inverter is also unbalanced, the problem is inside the Mitsubishi inverter, and it should be investigated.
|
|
The built-in analog quantity of the Mitsubishi PLC function module is changed to current input
Mitsubishi FX5UCPU module has a built-in analog input as a voltage input (DC0-10V),
In this way, it can be converted into an analog current input (DC4 - 20m).
[Method used in current input (DC4 - 20mA)]
FX5UCPU module only supports voltage ...
|
|
Characteristics of servos and advantages of Mitsubishi servos
The servo system is an automatic control system that enables the output of the object's orientation, direction, and state to change with the arbitrary change of the input quantity (or given value). In the automatic control system, the system that can echo the control signal with a certain degree of accuracy is called the follow-up system, also known as the servo system.
|
|
Mitsubishi inverter pre-use debugging method
1. No-load energizing test of Mitsubishi inverter.
1. Ground the ground terminal of the Mitsubishi inverter.
2 Connect the power input terminal of the Mitsubishi inverter to the power supply through the leakage maintenance switch.
3 Check whether the factory display window of the Mitsubishi inverter is normal, if it is not correct.
|
|
Features of the MELSEC iQ-R series of programmable controllers
1. Routine control is consistent with safety control
In the MELSEC-QS series, it is necessary to prepare a system for conventional control and a system for safety control. With the MELSEC iQ-R series of safe programmable controllers, it is possible to combine conventional and safe control into a single system.
Quiet...
|
|
Mitsubishi takes instructions and outputs instructions
1) LD (take instruction) A command to connect a normally open contact with the left bus, and every logic line that starts with a normally open contact is used with this instruction;
2) LDI (Reverse Instruction) A normally closed contact is connected to the left bus to the instruction, each ...
|
|
Mitsubishi FX5U series PLC advantages
1. CPU function
As a MELSEC IO-F series PLC actuator, it is equipped with executable structured programs and multiple program actuators, and can be written to ST language and FB.
2. Built-in analog input and output (alarm output by the way)
Built-in 12-bit 2-channel analog input ...
|
|
Analysis of the conversion principle of Mitsubishi PLC
1. The digital-to-analog converter is a system that converts digital signals into imitation signals, which can generally be completed by low-pass filtering. The digital signal is decoded in the first line, that is, the digital code is converted into the corresponding level to form a stepped signal, and then the low-pass filter is carried out.
According to the signal and system ...
|
|
Mitsubishi drive functions and functions
1. Control the start, stop, speed and so on of the servo motor;
2. Carry out various maintenance on the motor (overload, short circuit, undervoltage, etc.)
3. Respond to external signals, and control the servo motor (position, speed, torque) after internal PID conditioning;
The manipulator is the control of the electric ...
|
|
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 of Mitsubishi PLC series
1. Main substrate
There are a variety of models such as Q32SB, Q33SB, Q35SB, Q33B, Q35B, Q38B, Q312B and other main substrates for Q series PLC, and the meaning of the model is as follows:
In the meantime, the "S" stands for ultra-thin main substrate, and only Q61SP power modules can be used, and they cannot be ...
|
|
Mitsubishi servo system selection
Mitsubishi servo system mainly has MR-J4, MR-JE, MR-JE-AS and other series, MR-J2S, MR-J3, MR-ES has been discontinued, gradually withdrawn from the shopping mall, the first three are considered.
When selecting a Mitsubishi servo, the first thing is to choose the MR-J4 series or MR-JE series according to the application, and the driver uses the A-type ...
|
|
Mitsubishi servo motor method
1. Torque control: Torque control sets the output torque of the motor shaft through external imitation input or direct address assignment. For example, 10V is equivalent to 5Nm. When the external analog is set to 5V, the output of the motor shaft is 2.5 Nm. If the motor shaft load is less than 2.5 Nm, when the external load is 2.5 N...
|
|
Mitsubishi causes electromagnetic interference
1. Harmonic disturbance
The rectifier circuit will generate a harmonic current, which will cause a voltage drop on the impedance of the power supply system, resulting in a distortion of the voltage wavepattern, and this distorted voltage will cause disturbance to many electronic devices (because most electronic devices can only operate in the sine wave).
|
|
Mitsubishi A800 series inverter realizes motor self-learning
Set it up as follows:
Press PU/EXT to switch to PU format
Pr.9 = additional current of the motor
Pr.71=3 (ordinary motor) or 13 (constant torque motor)
Pr.80 = motor power
Pr.81 = number of poles of the motor ( ...
|
|
Mitsubishi PLC selection 5 elements
Mitsubishi PLC selection - element 1: IO points
The number of ZUI IOs that can be accessed by the Mitsubishi PLC control system.
Mitsubishi PLC FX series now commonly used basic unit host is: FX1SFX1N, FX1NC, FX2N, FX2NC, FX3U. FX3UCFX3G, FX5U, 9 series.
...
|
|
Analysis of PLC and inverter connection problems - Mitsubishi
When the inverter is used to form an active control system for control, in many cases, the PLC and the inverter are used together, and how to correctly connect the PLC and the inverter together has become the key to the success of the system.
1. PLC switch command signal input
Inverter input ...
|
|
Mitsubishi Electric one-click adjustment user instruction mode tuning method
1. Set PA08 to 0003 and set the gain adjustment form to; , the function is to prevent the failure of the active calculation of the inertia ratio, and the alarm C005 will be given.
2. Flip it over; menu; , set the speed/acceleration and deceleration/movement amount, according to the actual situation ...
|
|
Contact
working hours
