1. What is frequency conversion resolution? What's the point?
In the case of digitally operated inverters, the output frequency is given in a given order, even if the frequency command is an analog signal. The smallest unit of this gradient is called the variable resolution. For example, if the resolution is 0.5Hz, then the top of 23Hz can be changed to 23.5 and 24.0 Hz, so the action of the motor is also followed. This raises questions about the usefulness of manipulations such as sequential coiling. In this case, if the resolution is about 0.015Hz, the difference between one step of the 4-stage motor is less than 1r/min, and it can be fully adapted. In addition, some models have different resolutions from the output resolution.
2. What is the point of having a given model that can separate the acceleration time from the deceleration time, and the given model with the acceleration and deceleration time?
Acceleration and deceleration can be separated from a given model, for short-term acceleration and slow deceleration occasions, perhaps for small machine tools to demand strict given production cycle time occasions are appropriate, but for fan transmission and other occasions, acceleration and deceleration times are long, acceleration time and deceleration time can be given together.
3. What is regenerative braking?
If the motor reduces the command frequency during operation, the motor becomes an asynchronous generator and operates as a brake, which is called regenerative (electrical) braking.
4. Can I get more braking power?
The energy regenerated from the motor is stored in the filter capacitor of the inverter, because of the relationship between the capacitor capacity and the withstand voltage, the regenerative braking force of the general inverter is about 10%-20% of the rated torque. If the optional braking unit is used, it can reach 50%-100%.
5. What is the maintenance function of the inverter?
Maintenance functions can be divided into the following two categories:
(1) After detecting the abnormal situation, take the initiative to carry out correction actions, such as overcurrent loss speed avoidance, regeneration overvoltage stall avoidance.
(2) After detecting the abnormality, the PWM control signal of the power semiconductor device is closed, so that the motor actively stops. Such as overcurrent cut-off, regenerative over-voltage cut-off, semiconductor cooling fan overheating and instantaneous power outage maintenance.
6. Why is the maintenance function of the inverter activated when the clutch is connected to the load?
When the load is connected with the clutch, at the moment of connection, the motor changes sharply from the no-load condition to the area with a large slip rate, and the large current flowing through causes the inverter to trip over the current and cannot operate.
7. In the same factory, the large motor is moved together, and the inverter is stopped during operation, why is this?
When the motor starts, the starting current corresponding to the capacity will flow, and the voltage drop will occur in the transformer on the stator side of the motor, and the impact of this voltage drop will be great when the motor capacity is large, and the inverter connected to the same transformer will make a judgment of undervoltage or instantaneous stop, so sometimes the maintenance function (IPE) action will form a suspension operation.
8. What does stall avoidance function mean?
If the given acceleration time is too short, and the output frequency of the inverter changes much more than the change in rotational speed (angular frequency), the inverter will trip due to the flow of overcurrent, and the operation will be stopped, which is called stalling. In order to avoid stalling and continuing the operation of the motor, it is necessary to detect the magnitude of the current and control the frequency. When the acceleration current is too large, the acceleration rate is appropriately idle. The same is true when slowing down. The combination of the two is the stall function.
9. Is there any restriction on the direction of the device when installing the inverter?
The structure of the inside and back of the inverter takes into account the cooling effect, and the relationship between the top and bottom is also important for ventilation.
10. Overvoltage of inverter
The overvoltage alarm generally appears at the time of shutdown, and the main reason is that the deceleration time is too short or there is a problem with the braking resistance and braking unit.
11. The temperature of the inverter is too high
Other inverters also have high temperature faults, such as the temperature is too high alarm, after checking that the temperature sensor is normal, it may be caused by interference, and the fault can be shielded, and other inverters should also check the fan and ventilation of the inverter. For other types of failures, it is best to contact the manufacturer for a quick and feasible solution.
12. Overcurrent is the most frequent phenomenon of inverter alarm
The phenomenon of overcurrent of the inverter
(1) When restarting, it will trip as soon as the speed is raised. This is a very serious phenomenon of overcurrent. The main reasons are: short circuit of load, stuck mechanical parts; The inverter module is damaged; The torque of the motor is too small.
(2) Jump when powered on, this phenomenon generally cannot be reset, the main reasons are: bad module, bad drive circuit, bad current detection circuit. The main reasons for the acceleration are that the acceleration time is set too short, the upper current limit is set too small, and the torque compensation (V/F) is set too high.
13. Is it possible to put the motor directly into a fixed frequency inverter without soft start?
It is possible at very low frequencies, but if the given frequency is high, the conditions for direct starting of the power supply are similar. The high starting current (6-7 times the rated current) will flow too much, because the inverter cuts off the overcurrent, and the motor cannot start.
14. What problems should be paid attention to when the motor exceeds 60Hz?
When working beyond 60Hz, you should pay attention to the following
(1) Machinery and devices should have sufficient possibilities to operate at this speed (mechanical strength, noise, oscillation, etc.).
(2) When the motor enters the constant power output scale, its output torque should be able to maintain the operation (the cubic share of the output power and speed of the shaft of the fan and pump increases, so it is necessary to pay attention to the speed when the speed rises slightly).
(3) The problem of the life of the bearing should be fully considered.
15. What happens if the inverter doesn't have to be for a long time?
1. The lubricating fluid of the fan bearing of the inverter is dry, which affects the use.
2. The high-voltage filter capacitor does not have to be simply bulged for a long time, and the low-voltage electrolytic capacitor is simple to leak.
|
More on that
|
Introduction of Sunland inverter
1. Obtain accurate motor parameters from low to high parameters at different frequencies, and establish motor models of corresponding frequency bands in different frequency segments, so that the inverter can control the motor from low to high.
2. V/F control
(1) It is possible to select 15 pre-set V/...
|
|
What should I do if I forget the password?
With the passing of time, the inverter has now fully penetrated into the work of major industries. In our daily use, we will inevitably encounter all kinds of problems. For example, I forgot the cipher code of the inverter.
See here ...
|
|
The servo motor is connected to the wrong wire and causes a problem - Senlan
If the three power cables of the servo motor (SM) are not connected correctly, there may be no alarm in the static state. But as soon as the motor is operated manually or actively, the motor jumps off or starts to flutter, such as jumping when the speed is added too high, the system will issue generalized faults, etc.
|
|
The correct wiring of the rail power supply
The rail-rail power supply is a kind of switching power supply that is installed through the rail-type device, which is mainly used to monitor the voltage, current, temperature and other different aspects of the equipment, so that it can play a good maintenance effect. This switching power supply has a variety of different characteristics such as small size and light weight, ...
|
|
Sunland inverter breakdown factor
1. Overpressure leads to brake pipe breakdown.
The so-called overvoltage of the inverter refers to the fact that the inverter voltage composed of various reasons exceeds the rated voltage, which is reflected in the DC voltage of the inverter DC bus.
The overvoltage alarm generally appears at the time of shutdown, and its main ...
|
|
Motor starting mode - Senlan inverter
The inverter is a motor control (speed regulation) device that uses the on-off effect of power semiconductor devices to convert the power frequency power supply to another frequency.
Composition 1:
1. Rectifier unit: convert the communication electricity with fixed operating frequency into DC ...
|
|
Hope for an application example of Sunland inverter
Industrial process control: It is expected that Sunland inverters are widely used in industrial process production control, such as conveyors, tugboats, air compressors, pumps, and fans and other equipment in various control systems.
Mechanical control: It is expected that Sunland inverters are widely used in mechanical control, such as ...
|
|
The difference between Sunland inverter and soft starter
What is a frequency converter?
The inverter is a converter that converts the communication electricity with fixed voltage and frequency into the communication electricity with variable voltage and frequency, which is called the inverter. It is mainly used in the local demand for speed regulation, and its output not only changes the voltage but also changes the frequency together; The soft engine is really ...
|
|
Motor inverter principle and precautions for use - Senlan
The difference between a voltage converter and a current converter
Voltage inverter and current inverter are two different operating principles, for example, the operating principle of voltage inverter is mainly to regulate the voltage source, and the voltage source regulates the current to achieve the effect of conditioning, while the current inverter is a direct ...
|
|
The overload capacity of the dry-type transformer - Sunland inverter
Dry-type transformer is a kind of power equipment, and under normal circumstances, dry-type transformer also requires a certain amount of overload, that is, the workload beyond its working ability. So what about the overload of dry-type transformers and how to influence them?
...
|
|
Sunland inverters are designed for environmental requirements
1. The ambient temperature ---- is generally "-10-+40°C"; Derating between 40 and 50°C, the additional output current must be reduced by 1% for every 1°C increase. If the ambient temperature is too high and the temperature changes greatly, the insulation of the inverter will be greatly reduced, which will affect the life of the inverter.
...
|
|
Hope Sunland inverter application introduction
1. Motor control
The inverter is mainly used in the field of motor control, which can complete the speed control, torque control, and azimuth control of the motor. The inverter can adjust the speed and load of the motor according to the process requirements, which can improve the output power and quality.
2. Air conditioning refrigeration
...
|
|
Sunland low-voltage inverter division series
1.HG1000 high-performance light-load intelligent inverter, the most cost-effective, the new series is widely used in medicine, food, packaging, cable, printing and dyeing, washing, centrifuge, dehydrator, sewage treatment, HVAC, constant pressure water supply, constant temperature control, flow control and other industries, such as fans and pumps, ...
|
|
Application of Sunland inverter in sugar separator
First, the operation of the machine before the technical transformation
The sugar separation process of a sugar factory in Yunnan uses centrifugal dehydration method. The separation machine is mainly composed of a cone drum and a drive motor, and the motor shaft is directly connected to the bowl. Solid sugar crystallized from a high concentration of sugar water, in a cone bowl ...
|
|
Inverter load type - Sunland inverter
(1). Constant torque load
Different speeds, load resistance and torque base are stable. The output power is directly proportional to the rotational speed. Such as belt conveyors.
(2). Constant power load
Different speeds, stable load power base ...
|
|
The cause of leakage of the inverter-controlled motor - Senlan
In some fields, the use of inverter to control the motor will present the problem of leakage, and the leakage voltage ranges from tens of volts to 200 volts.
According to the inverter control motor ...
|
|
Inverter remote control wiring method - Senlan
1. Connect X (switching input) drive terminal to control the inverter start-stop/forward and reverse rotation;
2. Connect to the AI (analog input) terminal to control the frequency of the inverter (perhaps made into PID closed-loop control active conditioning frequency)
3. Other DO (switching output) is used for transmission ...
|
|
Sunland inverter braking resistor connection
Assuming that the inverter has a built-in braking unit and additional braking resistors, it is important to pay attention to the correct wiring of the braking resistors. The braking resistor should be connected between the P terminal and the DB terminal, but not between the P terminal and the N terminal, otherwise the three-phase rectifier bridge will operate at full load when it is not working, resulting in the equipment being unable to ...
|
|
The main step of inverter debugging - Sunland inverter
Investigation of the function of the inverter system
Before debugging the frequency converter, it is necessary to carefully read the operation instructions and related information of the inverter to be debugged to understand the application environment and precautions. Especially before the inverter is energized, it is necessary to carefully observe and see if the inverter has obvious problems.
|
|
Common problems in the use of inverters - Hope Sunland
1. Please clarify the maintenance function of the inverter?
(1) After detecting the abnormal situation, take the initiative to correct the action, such as overcurrent loss speed prevention, regeneration overvoltage stall prevention.
(2) Block the power semiconductors after detecting the abnormality...
|
|
Contact
working hours
