What are the benefits of starting an electric motor with a Y starter

High-power motors generally use soft start. If the high-power motor is started directly, the starting current is relatively large, and problems may occur (such as insurance system, transmission line, motor coil, etc.).The soft-start device is:

When the motor starts, the motor connection method is changed to Y connection by contactor, and the motor is changed to connection by contactor after the initial start. The principle is: when the motor Y is connected, each group of coils will bear 1 times the voltage of the transmission voltage (that is, the reciprocal of 3 squares), when the motor, each group of coils directly bears the transmission voltage, so that the soft start is realized.

Generally, more than 3kw with corner connection, the following with star connection, there is no advantage or disadvantage, a motor, the power of the star connection is greater than that of the handover, in the case of using the same power supply. However, the current is also increased by a factor of three.

The output voltage is not the same.

One is 380V industrial electricity and the other is 220V civil.

Y current is small: Large. Therefore, some of the larger motors use Y-start.

Soft start is step-down start, because the instantaneous current of high-power motor start is particularly large, the impact on the power grid is very large, so reduce the starting voltage to reduce the impact on the power grid, the usual soft start mode has a star delta step-down start, the principle is that when the motor winding is a star connection, each group of coils will bear 1 times the voltage of the transmission voltage (that is, the reciprocal of 3 squares), when the motor winding is triangulated, each group of coils directly bears the transmission voltage, so that the soft start is realized.

Add m00 before the program you want to stop

It seems that a single paragraph is fine, so I don't have to forget it for a long time.

Design a PLC control system for starting and stopping a single motor.

PLC control system for two-way control of electric motors.

are all common standard interfaces, so this question cannot be said;

Just pick a few cheap ones. For example, buy a CPU like S7200 224, 226, with dual serial ports. The touch screen buys the inch of Velonton, and the AC motor buys a smaller one, and so on, which is easy to tune and saves money, and then you have to buy a contactor.

But you still have to look for three-phase electricity. The inverter is cheap, domestic, small, and the like.

There are several scenarios in which a hard drive is broken and can usually be repaired:

1. There is a boot error and it cannot be started normally. This situation is not necessarily broken, usually clearing the MBR and repartitioning can be repaired 80%. If not, look at the third one.

2. It can be partitioned normally and formatted, but the scan found that the hard disk is marked with the "B" symbol, which is usually called "bad sector of the hard disk". There is no distinction between "physical bad sectors" and "logical bad sectors", and if the number of "bs" is small (less than 100), there is basically an 80% chance that the repair will be successful. This situation can be perfectly solved with some common repair software.

3. It cannot be partitioned normally, or it cannot be formatted after partitioning. In this case, professional repair software is required, but the success rate of repair is different depending on the brand of hard disk. Generally, the success rate of repair is about 50%.

4. The hard disk does not rotate after powering on. In this case, it is generally a circuit failure, and the circuit board IC or the entire circuit board can be completely replaced. Once it can be transferred and processed according to different situations, more than 60% of it is all right, but some hard disks may have other faults at the same time.

5. The self-test sound is normal, and the BIOS does not recognize the disk. This is caused by a variety of reasons, if it is a circuit board interface problem, repair the circuit board; If the hard disk enters the internal protection mode, you need to use professional software to switch it. The repair success rate is about 90%.

6. After the power is on, the sound of the magnetic head does not stop. This situation is because the head is damaged, but there are also non-damaged heads. If you don't need to replace the head if you don't save the data, and if the head is not broken, there is a 50% chance that it can be saved.

1. In this case, you can hang the hard disk to a normal computer for use. 2. Open the chassis and connect the hard disk power cable and data cable correctly. 3. Open the BIOS and set the newly added hard disk as a slave disk.

4. Turn on the system, and the system will automatically set the drive letter for the hard disk. 5. Enter the hard disk to copy out the required data. 6. Some recordings need to reinstall the recording software and put it into the storage directory, and use the original software for **.

So you can't.

Questions. Can I turn on the hard disk of the monitoring system if it is broken?

No, you can't. Questions.

So the monitoring system doesn't have a playback function, what's the reason?

Please wait a minute, we're answering it for you.

It is possible that there is an abnormality in the stored device.

You can click to check the status of the memory card, generally there are normal or abnormal, no card, if it is abnormal, you can format the memory card or change to a memory card with a slightly larger capacity and then test.

Questions. Is that a memory module problem?

You can take a look at the status of the memory card first.

It's basically a storage problem.

Damage to the hard drive generally does not result in the inability to boot, only the inability to access the operating system.

In the process of using the hard disk, the hard disk is damaged due to various reasons, and there are generally two situations, one is to generate logical bad sectors, which can be repaired. The second is the generation of bad sectors on the hardware, some software usually says that they can be repaired, but although the bad sectors can be hidden and shielded by some technical means. But it won't be long before the hard drive breaks.

Here's how to solve a bad hard drive.

The first step is to determine whether your hard drive has a logical bad sector or a hard disk bad sector. Logical bad sectors are generally easy to solve, and his manifestation is generally that the disk is often scanned when the machine is turned on, or the system disk cannot be found when the machine is not turned on. The display prompts the following information:

Or. <>

Step 2: In this case, if you can enter the system, you can use the built-in disk scan of Windows to fix it. Go to My Computer, right-click on the hard drive you want to repair, and select Properties.

Step 3: Select the toolbar and click "Start Check" in the error checker.

Step 4: In the dialog box that pops up, select "Automatically Fix File System Errors" and "Automatically Recover Bad Sectors", and start scanning and recovery. If it is a system disk, it will be scanned and repaired when the computer is booted after restarting.

Step 5、However, if you encounter a bad sector of the hard disk, you will have the following omens. The first is that the boot will suddenly slow down, which is manifested when walking through the Windows scrollbar and when entering the system. Of course, this alone is not enough.

Sixth, in addition to the above, there are some more serious phenomena of bad sectors of the hard disk, such as abnormal noise of the hard disk during operation, and the friction sound of the hard disk becomes a strange sound. If any of the above phenomena occur, it is determined that the hard disk is bad sector, and please send it to a repair point for repair.

It can be fixed by several software. Here's a closer look at how to fix it.

1、defraggler

Defraggler is a relatively lightweight decluttering tool in the decluttering world, but it can quickly and efficiently organize a disk, folder, or even a file. It can also check the contents of the hard disk, just like the check disk command in Windows, which is more familiar to everyone.

Defraggler also has a "Organize Specified File Folder" fragmentation feature like "WinContig". This is a feature that most software does not have, and it is one of its more distinctive features.

When we are looking at a file, we can view the disk fragmentation of a single file in Defraggler. After he's done with the entire analysis, you'll be able to use the drive, map and view the bits and pieces, which is still very convenient to use.

2、ssdlife

SSDLiO Free is an SSD detection tool. This detection tool is a completely free application software used under the Windows system, which can use SSDlife Free to detect the time of use of the SSD"Health"information and the remaining time of his use.

If the network sends the data of the SSD to a designated server, we can also get the data of the SSD from the web page**. Each SSD manufacturer has its own SSD management software, such as the Intel SSD Toolbox, which generates health status and provides detailed information for the drives.

3、recuva

Recuva (data recovery software) is a particularly powerful data recovery software, he can support all operating systems in the windwos series, he can support NTFS, FAT32, ExFAT and other files, data recovery on the system, it is really convenient.

Recuva can effectively recover files that have been deleted or formatted by mistake, and it can support the recovery of files on storage devices such as computer hard drives, USB flash drives, and portable hard drives. It can handily enable you to recover the content you want to recover. However, if you don't like to use the software with step-by-step instructions, you can also skip the wizard and go straight to the program.

While using Recuva, you will be prompted that you need to start a scan, and then you will have to select the file types you want to recover from the menu on the right and select the criteria for the filtering options. You can also use the filter options to scan specific elements (add or remove file types).

You can also enable Deep Scan instead of Quick Scan. You can also modify the viewing mode and control how overwrites are used to keep your data safely recovered.

Yes, you have to go to the computer city and ask the master there to help you recover. You need to pay for it, ** a lot of money.

There are different scenarios for the corruption of computer hard drives. However, it is generally distinguished into software failure and physical damage.

The so-called software failure is a problem with the data stored on the disk, such as the storage format, location, content ,,, of the data, etc., because the hard disk still stores some information about the hard disk itself, and these underlying data are usually required to be stored in a fixed location. When the data of the hard disk itself is recorded, the fault phenomenon is that the hard disk is either unreadable, the machine does not recognize the disk, or it will make an error when reading and writing data.

The so-called physical damage is also divided into various situations, such as mechanical damage and circuit damage. The main body of the hard disk is a series of concentric aluminum alloy discs that rotate at high speed, the discs are coated with magnetic coating, and several pairs of heads extend into the middle of the two disks to read and write data. The data is recorded on top of those magnetic coatings like audio tapes.

When the surface particles of these magnetic coatings fall off, it is naturally impossible to read and write data. In addition, if the circuit that controls the head is broken, it is impossible to accurately move the head between the two discs to read and write data, and it will naturally not be able to be used. Also, there is a circuit board on the hard disk, which has all the control circuits of the hard disk, including the servo control circuit of the high-speed rotating motor, the control circuit of the head movement, the amplification circuit of pulse data,,,, etc., when these things go wrong, the natural hard disk can not work normally.

These failures are often collectively referred to as "physical damage".

As for the hard disk is broken, whether it can be repaired depends on what is broken. If it's a software issue, then a low-level formatting usually fixes it.

If it is a physical damage, and there is no problem with the main body of the hard disk, and the components on those circuit boards are broken, it is usually no problem to replace the circuit board with the same type of hard disk. (In Zhongguancun maintenance, the whole board is generally replaced, and those components are not repaired).

If the head is broken, it is generally impossible to repair, because the positioning accuracy of the head is extremely high, and it cannot be adjusted without the high-precision positioning system tools of the hard disk manufacturer.

But if the magnetic coating is broken, it is more troublesome. It is not possible to take the hard drive apart and reapply the magnetic coatings. So even though the fault is local, and if the location is not in the boot main sector, the hard disk can still be used, but when the data from this fault location is used, the machine will inexplicably crash.

So such a disk is basically impossible to repair.

If the computer can't turn on, there must be a problem with the computer hardware, and it is best to use the replacement method to eliminate the problem

1. Press the upper and lower case on the keyboard. The light is on, indicating that the graphics card, monitor, and other hardware are faulty.

2. If the keyboard light does not light up, it means that it is a memory, CPU, motherboard, or power supply problem.

Solution: 1. If the keyboard light does not light up, first wipe the memory module with an eraser, and check whether the gold finger of the memory module has any burnt marks. Replace the memory in the slot.

2. Check the capacitors and resistors on the motherboard to see if the capacitors are bulging, whether there is a burning smell on the motherboard, and clean up the dust on the motherboard.

3. Remove the CPU fan, power on and turn on, test whether the CPU has a temperature change by hand, if not, the CPU is not working, either the motherboard is broken, or the CPU is not plugged in properly, and the CPU is re-plugged.

4. Power supply problem, although the power supply is powered on, but the motherboard can not work normally, replace the power supply and try it.

5. If the display card is loose or oxidized, the keyboard light will be on, the screen will not be displayed, wipe the gold finger of the graphics card with an eraser, and check whether the capacitance on the graphics card is bulging.

6. Minimize the test method, only leave the power supply, motherboard, CPU, memory, graphics card, keyboard, monitor, unplug all the wires on the rest of the motherboard, use a screw knife to short the switch pins, if normal, add the rest of the hardware, piece by piece, until the cause of the problem is found.