The current value of the motor is used as the basis for the selection of the inverter, and the rated power of the motor is only for reference.
Compared with the general squirrel cage motor, the winding motor simply has the problem of overcurrent tripping, and the inverter with a slightly larger capacity than usual should be selected.
When the power frequency motor is dragged by the inverter, the current of the motor will increase by 10-15%, and the temperature rise will increase by about 20-25%.
When the inverter is used to drive the gear reducer motor, the application range is limited by the smooth way of the gear rolling part. When the rated speed is exceeded, the risk of running out of oil may occur.
Special occasions such as high temperature, frequent switching, high altitude and so on will make the capacity of the inverter drop rain, and it is recommended that the inverter be selected according to the expansion of one gear.
The output of the inverter contains abundant higher harmonics, which will reduce the power factor and efficiency function of the motor.
When the inverter wants to run with a long cable, the influence of the cable on the function should be considered, and a special cable should be selected if necessary. To compensate for this problem, the inverter should be expanded by one or two gears.
For loads with large torque fluctuations such as compressors and vibrating machines, and peak loads such as hydraulic pumps, we should fully understand the power frequency operation status and choose a higher inverter.
Compared with the power frequency power supply, the output capacity of the inverter will decrease by 10-20% when driving the synchronous motor.
When a high-speed motor is controlled by an inverter, a large number of high-order harmonics are generated. These higher harmonics will increase the output current value of the inverter. Therefore, when selecting the inverter, it should be one gear larger than the general motor.
|
More on that
|
Introduction to the selection conditions of Mitsubishi A840 series inverters
Q: When will I choose the A840 series inverter?
A: A800 series inverters are generally used in heavy-duty occupations, such as lifting occupations, mixer occupations will use A800 series. At the same time, it is a vector inverter, so customers need to do closed-loop speed control, torque control may ...
|
|
Mitsubishi Step Ladder Instruction [STL], [RET] usage example
Step Instruction (STL) is an instruction that uses internal software components to control the process step on top of the sequential control program. A step-to-back instruction (RET) is an instruction that is used to return to the main program (bus) after the state (S) process is completed.
...
|
|
The interaction between the PLC and the touch screen is consistent - Mitsubishi
When the contact screen is connected with the PLC, in fact, the memory of the PLC is used, (the contact screen also has a small amount of memory, which is only used to store system data, that is, the screen, controls, etc.), the contact screen and the PLC communication is generally a master/slave relationship, that is, the contact screen reads data from the PLC, and after making a judgment, it is displayed in the display ...
|
|
Confirmation and clearing of Mitsubishi inverter FR-CS80 alarm history
When the FR-CS80 inverter detects an abnormality, it will display an error message or alarm in the operation panel according to the abnormal content, or maintain the function action and block the output of the inverter. When maintaining a function operation, please deal with the cause of its operation before resetting the inverter, and then start working. ...
|
|
How does Mitsubishi PLC work?
1. A scanning cycle is divided into input sampling, program fulfillment, and output rewriting.
2. Each scan process. The convergence samples the input signal. The convergence rewrites the output signal.
3. The inner ...
|
|
Mitsubishi Electric CNC numerical control system grounding specification
What is the effect of machine tool grounding?
1. Insist that the machine shell and the ground insist on the same voltage.
2. In the event of abnormal external voltage or leakage, the maintenance personnel and the machine tool will not be damaged electrically.
3. Avoid damage to CNC equipment caused by external voltages such as surges.
4. ...
|
|
Mitsubishi Electric develops satellites for greenhouse gas and water cycle observations
TOKYO, March 30, 2020 – Mitsubishi Electric Corporation (Tokyo: 6503) announced today that it has been appointed by the Japan Aerospace Agency (JAXA) as the contractor for the Global Satellite Observing Satellite for the Greenhouse Gas and Water Cycle (GOSAT-GW), the third satellite in the GOSAT series, ...
|
|
Z series and A200 series inverter fault solving
Low-power Z024 series inverter, our common problems include OC, ERR, no appearance, etc. There are two possible causes of OC.
(1) Aging of the drive circuit
Because the use of a long period of time will inevitably lead to the aging of components, which will cause the driving waveform to occur.
|
|
Mitsubishi AnS series analog module bias and gain applications
In today's industrial field, when using analog-to-digital conversion or digital-to-analog conversion, most of them do not only use the standard input characteristics of -10V-+10V, 0-20mA, but according to the practical voltage and current values to do the process requirements, then it is necessary to do the AD or DA module ...
|
|
Mitsubishi Q Series PLC and GX Works2 connection method
01 USB connection
USB connection requires a device USB driver, generally after installing GX Works2 software, it will automatically install the driver, but a single time due to antivirus software or system reasons, may not be installed, then we need to manually drive the device to the accounting machine. The specific device method we ...
|
|
Mitsubishi inverter capacity selection
The capacity (non-functional) of the Mitsubishi inverter for the drive motor can be understood from the change in energy flow determined by the operation method.
1. When accelerating or operating at constant speed
The efficiency of the inverter is the output current, that is, how much current the inverter can provide to the motor. Frequency converters ...
|
|
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 ...
|
|
Mitsubishi FX2N Series Extended PLC Module Selection Chart
|
|
Mitsubishi inverter fault judgment method
1. UVT problem
UVT is an under-voltage problem, and I believe that many customers will still encounter such problems in use.
The common undervoltage detection point of Mitsubishi inverter is the voltage on the DC bus side, and a low voltage value is sampled after the voltage division of the large resistance resistor, which is compared with the standard voltage value ...
|
|
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 PLC power supply live wire and neutral wire short circuit solution
1. First of all, the power supply should be cut off immediately and the circuit should be admitted whether it has been disconnected.
2. Next, check whether the fuse of the power supply is blown or whether the protector is tripped. Replace the fuse or reset the protector. Envy
3. Fuse ...
|
|
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?
...
|
|
PLC commonly used physical memory - Mitsubishi
(1) Random Access Memory (RAM) The user can read out the content of the RAM with the programming device, and can also write the user program to the RAM, so the RAM is also called read/write memory. It is volatile memory, and when its power is interrupted, the stored information is lost. The use of the computer's memory module ...
|
|
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 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.
|
|