1. What does open-loop mean in the use of inverters?
The speed detector (PG) is installed on the motor equipment in operation, and the speed response of the actual speed is sent to the control equipment, which is called "closed loop", and the speed detector that does not use PG is called "open loop". Most general-purpose drives are open-loop, and some machines utilize selected parts to provide a PG response.
2. What to do when the practice speed goes against the given speed?
When the output frequency of the motor is punctual, the speed of the motor will also change in the range of the additional slip rate (1%-5%) in the open-loop situation. Inverter with PG response function (optional) can be used even when the load is changed, and the speed is close to a given speed.
3. If the PG motor is used, can the speed accuracy be improved after the reaction?
The inverter with PG reaction function has high accuracy. But the speed accuracy depends on the accuracy of the PG itself and the resolution of the output frequency.
4. What is the stall avoidance function?
When the acceleration time is too short, and the change of the output frequency of the inverter is much greater than the change of the speed (electric angular frequency), the inverter will trip due to excessive current and stop running, which is the so-called stall. In order to avoid continuous operation of the motor due to stalling, it is necessary to sense the current and manipulate the frequency. In the case of excessive acceleration current, the acceleration rate is appropriately reduced. The same is true when slowing down. The combination of these two functions is a stall.
5. What is the significance of the type of machine with the acceleration time and the deceleration time that can be given separately, and the type given with the acceleration and deceleration time?
Strict rules on short-term ramp-up, slow deceleration or the need for small machine tools can be given separately for production time, but for fans and other occasions, acceleration and deceleration times can be given together.
6. What is regenerative braking?
If the motor reduces the frequency of the instructions in operation, then the motor becomes an asynchronous generator and works as a brake, i.e. regenerative braking.
7. Can the braking force be increased?
The energy recovered from the motor is stored in the filter capacitor of the inverter, because the capacitor capacity is related to the voltage resistance, the regenerative braking force of the general inverter is about 10%-20% of the additional torque, that is, 10% to 20% of the additional torque. With the optional braking unit, it can reach 50%-100%.
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Senlan inverter selection principle
1. Select the inverter according to the load characteristics, such as the load is constant torque load, you can choose Siemens MM440 inverter, ABB ACS800 series inverter, etc.; If the load is a fan or pump load, you can choose Siemens MM430 inverter, ABB ACS510 series inverter, etc.
2、 ...
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Introduction to the main series of Sunland inverter products
SB150
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Heat dissipation method of small-capacity inverter - Senlan
Natural heat dissipation methods are generally used for heat dissipation of small-capacity inverters, because their operating environment should be well ventilated and free of dust and floating objects. The dragging objects of this type of inverter are mostly household air conditioners, CNC machine tools, etc., and the power is small.
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Motor encoder and rotor pole phase zero alignment repair - Sunland
1. Phase alignment method of incremental encoder
The alignment between the phase of the UVW electronic transmutation signal and the phase of the rotor pole, or the phase of the TV spot, of the incremental encoder with the signal exchange is as follows:
1) Use a DC power supply to pass the UV winding of the motor to less than the amount of ...
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Inverter maintenance and cleaning inspection method - Senlan inverter
There are many special faults, which come and go, looming, making it impossible to judge and deal with. At this time, you can clean the circuit board with water or alcohol, and brush off the dust and rust on the circuit board with a soft brush, especially pay attention to the solder joints are dense, and the circuit near the 0 volt copper layer is also ...
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Sunland attended the 2015 Industrial Automation Exhibition in Nuremberg, Germany
November 24, 2015 - November 26, 2015, "Germany Nuremberg Industrial Automation Exhibition" was successfully carried out at the Nuremberg International Exhibition Center in Germany, and it is expected that Sunland as a domestic professional inverter manufacturer also participated in the exhibition, in this exhibition, in addition to the usual SB70, ...
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The inverter is regularly replaced with the device - Sunland inverter
1. Cooling fan
As a prerequisite for ensuring the normal operation of the inverter, efficient and fast in-line cooling fans have become an indispensable conversion configuration of the inverter. Because of the wear of the internal bearings of the cooling fan and the reduction of the grease function in the process of application, the cooling of the fan.
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Sunland inverter wiring standard
It is necessary to separate the signal line from the power line: when using analog signals for long-distance control of the inverter, in order to reduce the disturbance of the analog amount from the inverter and other equipment, please separate the signal line of the control inverter from the strong current circuit (main circuit and sequential control circuit). Inverter ...
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The inverter has an overvoltage phenomenon - Sunland inverter
Inverters often encounter a variety of problems during commissioning and use, during which overvoltage is the most common. After the overvoltage occurs, in order to avoid damage to the internal circuit, the overvoltage protection function of the inverter will work, so that the inverter will operate intermittently, resulting in the equipment can not be ...
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Sunland SBH series high-voltage inverter eight development direction cases
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The reason for the explosion of the inverter module - Senlan inverter
1. Condensation The temperature difference in the workshop is large, and the inside of the inverter presents condensation.
2. Impact load. The load fluctuates greatly, and the output current of the inverter suddenly increases, resulting in module damage.
3. The inverter is overloaded in the start, ...
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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 ...
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Inverter overcurrent protection solution - Senlan
1. Causes of overcurrent
There are many reasons for the occurrence of overcurrent, including soft and hard problems.
1. Causes of soft failures
When the acceleration or deceleration time in the inverter parameters is set too short, and the motor power is heavy, it means that in the acceleration, the inverter's ...
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Practical installation precautions for frequency converters
When the line power supply exceeds the driver's kV-A rating by 10 times, add a line reactor.
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The inverter's requirements for the surrounding environment - Senlan
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The difference between Sunland inverter and soft starter
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We all know that the three-phase stator winding of the motor ...
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