What are the main reasons for elevator inverter damage?

Generally speaking, the deceleration distance is not enough, and basically there will be no phenomenon of stopping the elevator, and the elevator is generally a little higher or lower than the floor.

You're talking about shaking when you reach the level, and there are 2 kinds of Ken Can.

The first is the encoder, you pay attention to whether the encoder is stable when it rotates, and the second is the frequency converter, which is more troublesome, and it is not very clear, it is judged by experience.

It is recommended that you pay careful attention to the first point.

As for the protection when the high speed is replaced by the low speed, this is not very clear, I guess there are several possibilities, note, I also guess, after all, I can't see the scene.

First, pay attention to the inverter... This is nonsense, you doubt it.

Second, you pay attention to whether the door machine is heated.

Well, it's an encoder.,Hey.。。 PLC's is such a trouble, the drawings are not enough, but the year is enough. Enough for a headache.

What brand of inverter? According to your description, the acceleration and deceleration time should be too short, and the appropriate length can solve the above problems, which is also the cause of jitter.

Acceleration and deceleration time and encoder wiring check.

The IGBT of the inverter is damaged. Repair or replacement. If you really have no ability to replace, you need to check the following items:

Is the rail oil changed to antifreeze oil? Whether the guide rails have not been cleaned for a long time. Do I need to replace the boot lining?

After the above items are done, it will have a significant effect.

There are many reasons for inverter damage, and the most common ones are the following five categories:

1. The installation and use environment is harsh, and no routine maintenance is done, which leads to dust, moisture, chemical pollution, etc. inside the inverter.

2 The installation environment of the inverter does not meet the requirements, for example, improper ventilation, dustproof, and waterproof.

3. Routine routine inspection is not done as required (the inverter is damaged due to aging or defective related supporting equipment).

4 Natural disasters, e.g., lightning strikes, flooding, unstable grid voltage.

5. The service life of the inverter is damaged at the end of its service life (the service life of the imported inverter is generally more than 10 years).

The first 3 of the above damage causes account for 80%, if the user can do the first 3 work, the failure rate will be greatly reduced.

In the face of the above situations, you can refer to How to maintain and maintain the inverter Inverter maintenance precautions, these two articles to maintain the inverter in advance. We won't go into detail here. Here's what we should do if something goes wrong.

Inverter maintenance instructions.

1. The inverter has a dangerous voltage level, and there will be a dangerous voltage on the signal relay. If not operated by specially trained operators, it can cause serious personal injury and significant property damage. Therefore, please be sure to follow the instructions for use when repairing and using.

1. The use of rectifier maintenance must be carried out by the corresponding qualified operator, and before any work is carried out, it is necessary to be familiar with the safety information and instructions for installation, operation and maintenance.

2. Before carrying out observation and maintenance work, make sure that the AC power supply is cut off and locked, and that the rectifier is grounded. Before the AC power supply is cut off, both the rectifier and the motor carry dangerous voltage levels. Even if the rectifier contactor is disconnected, there is still a dangerous voltage.

3. Only spare parts approved by the manufacturer can be used.

2. If you are a non-professional, even if you have done all the safety work, we also recommend that you seek professional maintenance work.

Years of maintenance experience tell us that, in fact, when the inverter has abnormal noise, there is a problem, then it is best to repair, and when the inverter is completely ineffective, the damage may be more serious. If you don't have maintenance experience, don't do it yourself, many people make the inverter worse. There are also the following risks (often seen) in repairing it yourself:

For example, if you buy a fake module, the driver is faulty but not detected, the wrong wire is installed, the screws are not tightened, etc.! These can burn the inverter even worse!

If the elevator inverter fails, you can find the staff who repair the elevator to come to the door for maintenance. It needs to be re-checked from two aspects: first, the maintenance of the inverter is really complicated, and the quality of the maintenance you take is impossible to verify; Second, there is a short circuit in the load; Due to the well-established protection of the frequency converters, damage caused by external causes is not common.

An elevator inverter is an instrument specially used for elevator control. Elevator special inverter is a high-end product in the small and medium-power inverter, which makes the elevator improve efficiency, smooth operation, equipment life extension, combined with PLC or microcomputer control, but also shows the advantages of non-contact control: simplified line, flexible control, reliable operation, convenient maintenance and fault monitoring.

Many faults of elevator inverter are caused by the high temperature of its working environment and the components are easy to age, the elevator inverter is installed in the control room on the top floor of the building, often exposed to the sun in summer, coupled with the heating of the inverter itself and the braking resistance, so that the electrical room is very high or sultry temperature bending, and the high temperature of the working environment will shorten the service life of electronic components.

The inverter is more obvious in this regard, so in addition to the ventilation problem in the design of the elevator electrical room, Tuanzhou should also pay attention to heat insulation, such as hollow bricks for the wall, multi-layer design on the top of the room, if it can be equipped with an air conditioner, the life of the inverter will be much longer. If the electrical cabinet installed with the inverter is found to be very high in Xiatian, the electric cabinet door should be opened, I have seen many manufacturers' electrical cabinet design is too small! Just enough to install the inverter!

And there is no cooling fan installed.

Common faults and treatment methods of elevator inverter maintenance:

1. Fault judgment, the damage of the rectifier module is usually caused by the grid voltage or internal short circuit. In the case of excluding internal short circuits, the rectifier bridge is replaced.

When dealing with faults on site, it is necessary to focus on checking the user's power grid, such as grid voltage and whether there is an electric welding machine.

and other equipment that pollutes the power grid.

2. The damage of the inverter module is usually caused by motor or cable damage and drive circuit failure. After repairing the driving circuit, replace the module when the driving waveform is in good condition. After replacing the driver board during on-site service, care must be taken to check the slow shouting motor and connecting cables.

3. After confirming that there is no fault, the inverter can only be operated without display when it is powered on, which is usually due to the damage of the switching power supply or the damage of the soft charging circuit.

If there is no direct current on the road, if the starting resistor is damaged, the operation panel will also be damaged.

4. The display of overvoltage or undervoltage is usually caused by the lack of phase of the input, the aging of the circuit and the moisture of the circuit board. The solution is to find out the voltage detection circuit and detection point, and replace the damaged device.

5. The display of overcurrent or short circuit to ground is usually due to damage to the current detection circuit. Such as Hall elements.

op amp circuits, etc.

6. The overcurrent of the power supply and the driver board is usually caused by the damage of the drive circuit or inverter module.

7. The output voltage of the empty open volt load is normal, and the overload or overcurrent is displayed after the load is usually caused by improper parameter setting or aging of the driving circuit and damage to the module.

The elevator inverter mega digging is generally a voltage scattering type AC-DC inverter. The basic structure consists of three parts:

1. Rectifier circuit, convert alternating current into DC group backup power.

2. DC bus, energy storage link, complete reactive power exchange in the link, and the inverter can obtain a higher input power factor.

3. Inverter, which converts direct current into alternating current with variable frequency and amplitude, so that the motor works at different speeds.

For a detailed inverter principle, please refer to the attachment.

Question 1: What are the main reasons for the burning out of the elevator inverter?

220V, plus or minus 10% will not burn the inverter.

Heat dissipation, load, etc. are the main reasons.

Question 2: What are the main reasons for the damage of the elevator inverter?

I think it's better to check the power supply. In addition, if the elevator is outdoors, you should choose some shielded wires.

Catch the ground well to protect against lightning strikes.

Question 3: What is the reason for the failure of the elevator inverter?

Don't look for the manufacturer, how are you going to do it.

The inverter is a very important component in the elevator.

If you don't contact the manufacturer and find a way to get it yourself, then there will be an accident, and the elevator manufacturer will have no responsibility.

Because you did the repairs yourself.

Question 4: How to write a report on the cause of the burnout of the elevator inverter.

Li Gong of inverter maintenance factory.

Question 5: What is the general cause of the inverter burning in the elevator Mernac system?

The relationship between the burn transformer and the elevator control system is less, and it can be known by looking at the drawings that the transformer provides several power supplies to the control system, and the common voltages are AC220V, DC110V, DC24. Generally, 220V is isolated, mainly for power supply and lighting to the door operator. DC110V is the power supply and safety loop of the brake, and DC24V is the working power supply of the supply system.

Only AC220V and DC110V are prone to short circuits, so basically they have nothing to do with the system, and the possibility of short circuits in lighting is lower than that of safety circuits, so basically the damage caused by short circuits to ground in safety loops is the main one. The general safety loop is composed of the hoistway safety loop and the door lock loop, and the problem needs to be judged separately, so it is easy to find the fault point.

Problem 6: The elevator inverter always burns out at the moment of power failure and re-energization.

After the power failure, pull down the power switch, otherwise the power transmission distance is too far when the call comes in, resulting in an instantaneous voltage that will overload the equipment and damage the equipment.

Question 7: What should I do if the capacitor of the elevator inverter is always burned?

Increase the capacitance and withstand voltage of the capacitor and increase the braking resistance.

Problem 8: The reason why the elevator circuit board is easy to burn out.

It is possible that the current is high, or the water has entered.

Question 9: KONE elevator inverter is easy to break under what circumstances.

The inverter is generally prone to damage the IGBT inside when the load is too heavy (the current is too large), and the IGBT is the core of the entire inverter, and the maintenance cost is not small if it is broken.

Question 10: Why does the Siemens elevator burn out the inverter?

Probably not, the inverter enters the three-phase electricity.

It's no problem to pick it up. If there is a reversal, it is only the reversal of the motor.

It won't burn out the inverter. It shouldn't be caused by this reason.

1. Visual inspection method: see whether there are traces of burning, see whether there are traces of burning or bulging of internal components, etc.; Smell the smell of burning, etc.; Check the inverter fault** to determine the fault point. 2. Analogy check method:

This method can be an analogy of the same circuit itself, or an analogy between a faulty board and a known good board. This can help repairers quickly narrow down inspections. 3. Replacement inspection method:

It is a very effective way to confirm the fault with a spare circuit board or a board of the same model and narrow down the scope of the inspection. 4. Percussion inspection method: use an insulated rubber rod to knock on the suspicious bad parts, if the fault of the inverter disappears or reproduces, it is likely that the problem is there.

5. Principle analysis and inspection method: principle analysis is the most fundamental method of troubleshooting, when other inspection methods are difficult to work, you can start from the basic principle of the circuit, step by step, and finally find out the cause of the failure.

Summary. Kiss. <>

2.Contact maintenance personnel: It is recommended to contact professional elevator maintenance personnel or business personnel in time.

Elevator drives are complex pieces of equipment that require professional training and authorization to be repaired and replaced. 3Provide detailed information: When communicating with maintenance personnel, have the model of the drive, a description of the fault, and any other relevant information ready so that they can better understand the problem and provide technical support.

Kiss. <>

<> am honored to answer for you, thank you for your patience and inquiry: You find that the elevator's inverter (also known as the elevator drive) is faulty, for the following situations:1

2.Contact maintenance personnel: It is recommended to contact professional elevator maintenance personnel or business personnel in time.

Elevator drives are complex pieces of equipment that require professional training and authorization to be repaired and replaced. 3Provide detailed information: When communicating with maintenance personnel, have the model of the drive, a description of the fault, and any other relevant information ready so that they can better understand the problem and provide technical support.

Kiss. <>

<> am honored to answer for you, thank you Liang Gai for your patience, and pay tribute to the precautions for you: the elevator is a high-risk equipment, and any elevator failure should be handled by professionals. Yezhan contacts and relies on the experienced elevator maintenance team in a timely manner to ensure that the elevator can resume normal operation and ensure the safety of passengers.