The inverter is the control equipment for the operation of the motor, and it has a certain maintenance function for the motor. Most of the inverter appliances have functions such as overvoltage, overcurrent, undervoltage and overload maintenance.
Overcurrent maintenance function. In any link of motor acceleration, deceleration and constant speed operation, through the limitation of the maximum current value, the overcurrent maintenance function can be started, that is, when the motor is overcurrent, or the output terminal produces a short circuit, etc., the instantaneous value of the output current of the inverter is greater than the current detection value, the overcurrent maintenance function acts, forces the motor to stop, and performs a maintenance role on the motor.
Abnormal voltage maintenance function. The first situation is overvoltage maintenance: due to the addition of the regenerative voltage of the motor, that is, the overvoltage state, the maintenance function action when the DC voltage of the main circuit reaches the overvoltage detection value. However, if too high a voltage is applied incorrectly to the input side of the inverter, useful maintenance cannot be performed. The second situation is undervoltage maintenance: that is, when the power supply voltage decreases, etc., so that the DC voltage of the main circuit is low to the undervoltage detection value, the maintenance function is acted. If the instantaneous power failure and restart function is selected, the power supply will be interrupted, and the power supply will be restored to actively reset and restart, and the alarm signal will not be output at this time. If the voltage value drops to the voltage of the inverter control circuit and cannot be maintained, the full maintenance function will be automatically reset.
Motor overload maintenance function. When the motor current exceeds the set value of the electronic thermal overload relay, the maintenance function is activated. This function is not available in all inverters, and some inverters can only maintain some specific motor types, and other motors may not be well maintained. Therefore, when the inverter is modeled, the problem should be comprehensively checked; In addition, when multiple electric motors are driven by a single inverter, each motor must be equipped with its own thermal overload relay.
In practical application, it is found that the functions of different brands of inverters are not the same, and the control and maintenance functions of the motor are also quite different, so it is necessary to select and match a better inverter for the safety of motor operation and the overall operation effect.
|
More on that
|
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 ...
|
|
Explanation of Mitsubishi pIc source type and drain type
The source type is the power supply of the device, which has an input drive source and an output point with a power supply; Drain type means that the device does not have its own power supply, and the drive of the input point requires an external power supply, and the output is only a passive contact signal.
The general input points are ...
|
|
The cause of the failure caused by OC - Mitsubishi inverter
1. Aging of drive circuit
Due to the long-term use, it will inevitably lead to the aging of components, and then cause the drive waveform to be distorted, and the output voltage will be unstable, so OC alarm often appears as soon as it is running.
...
|
|
Mitsubishi FX series PLC fault diagnosis method
1. Power indication (LED indication) When power is supplied to the Mitsubishi PLC root unit, the [POWER] LED indicator light installed on the surface of the root unit turns on. If the power supply is closed but the [POWER] LED does not illuminate, please acknowledge the power wiring. In addition, if the same power supply has a drive sensor, etc. ...
|
|
Mitsubishi PLC commonly used model features
FX Series PLC: The FX3G PLC has a built-in large-capacity program memory, 32K steps, and the basic instruction processing speed can reach 0.21μs in standard mode. In the meantime, the FX series 5U is suitable for any industry, and is widely used by small and medium-sized enterprises. For example, this year's very popular mask machine is suitable for FX5U, and he can ...
|
|
Mitsubishi FX1N switching power supply fault repair
Problem description: The power supply of the Mitsubishi FX1N-60MR-001 has no display (the safety guard, filter, temperature protection element, and rectifier are damaged).
Inspection and repair: After the PLC is connected to the power supply, the power indicator (POWER light) does not light up.
|
|
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 floating-point number comparison and arithmetic instruction usage
The floating-point arithmetic instruction (FNC110-FNC1320) is used to process floating-point numbers, which are 32 digits and contain 13 instructions such as floating-point number comparison, transformation, four-rule operation, open-squared operation and trigonometric function.
All floating-point processing instructions are 32-bit instructions, and when used ...
|
|
Mitsubishi inverter pre-use debugging steps
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 Mitsubishi inverter is normal, if it is not correct.
|
|
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 ...
|
|
Mitsubishi servo motor is now commonly used
1. Torque control: Torque control is based on external simulation imitation type or direct address assignment to set the output torque of the motor shaft. For example, 10V matches 5Nm. When the external simulation simulation is set to 5V, the output of the motor shaft is 2.5Nm. Assuming that the load on the motor shaft is less than 2.5Nm, then ...
|
|
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 ...
|
|
Low-voltage electrical faults and maintenance methods - Mitsubishi
In the process of operation, low-voltage electrical appliances will present problems due to improper use or long-term operation of aging components, and there are many kinds of problems, and the common problems are analyzed and dealt with.
1. Contact problems and repairs
The contact is the primary component of the low-voltage switching coupon, ...
|
|
The connection of the Mitsubishi inverter FR-A800
The connection of the Mitsubishi inverter FR-A800
|
|
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?
...
|
|
Mitsubishi PLC control servo motor method
1. The transistor output type of the FX series generally sends pulses to the servo through the output point of Y0, Y1 or the positioning module, and the speed and direction of the servo depend on the frequency and direction of the pulse in your program.
Mitsubishi FX3U series ...
|
|
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.
|
|
Maintenance method of Mitsubishi inverter
Electrical characteristics view
Mitsubishi inverters that have been running and placed for a long time, due to the influence of the environment and the aging of inverter equipment, it is necessary to check and maintain the electrical performance of Mitsubishi inverters regularly. A comprehensive review of the input, rectifier and inverter, DC input fuses found ...
|
|
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 ...
|
|
PLC control cabinet design and use to meet the heat dissipation requirements - Mitsubishi
The PLC control cabinet is the final level of equipment in the power distribution system. It mainly protects, supervises and controls the entire circuit, which is convenient for unified management. The power distribution cabinet is a kind of equipment that can reasonably distribute electrical energy and make the circuit easy to open and close. But because it is a circuit device, the requirements for the level of safety protection ...
|
|
Contact
working hours
