The inverter screw air compressor talks to you about the reasons and solutions for the inverter frequency not being able to be adjusted up
1. The acceleration time is too short
In theory, the longer the acceleration time, the stronger the ability to increase the load. If the acceleration time is set too short, some inverters will display overcurrent or overload overheating alarms, but some will not be displayed, but just stuck in a certain frequency segment.
2. The V/F ratio is too large
Some inverters are also called torque increase. If this parameter is set too large, sometimes it will not start normally. Appropriate reduction will solve the problem
3. Vector control parameters do not match
In the vector control mode, the internal resistance, inductance and other parameters of the motor need to be precisely measured, and the vector parameters of the inverter need to be well matched. After running for a period of time, the motor parameters are overheated and offset, which will cause excessive current and fail to start the motor normally. The frequency may also be stuck at a certain segment point. Re-optimizing the parameters can solve the problem.
4. High frequency and maximum frequency are set too low
Generally, these two parameters are set to large values, but some careless electricians may change these two parameters, which will also cause the frequency to be unable to be increased.
5. Parameters in some special occasions need to be paired
In some occasions, the low frequency cannot be set too low. For example, in the constant pressure water supply system, after the low frequency is set to 0Hz, when the water pump pressure is low, the inverter starts to accelerate when it exceeds the starting frequency of the inverter, and the pressure can never be increased. The inverter frequency can never be increased to 50Hz, only about 38Hz. Repeatedly set and adjust PID, the frequency can never be increased. Only by setting the low frequency of the inverter to about 15-20HZ can the acceleration of the inverter be satisfied, and the water pump can be kept at a certain pressure position. Although the pressure meets the constant pressure requirements, when water is not used, the inverter cannot be completely stopped and the low frequency speed is always maintained.
This is because: in the constant pressure water supply system, the low frequency of the inverter cannot be set to 0HZ, and is generally at least around 20HZ, which is determined by the flow and head of the water pump.
The solution is to set the sleep frequency. When the frequency (for example, 28HZ) when the water pump does not use water runs for several minutes, the water pump sleeps. When the pressure drops to 0.2-0.4MP lower than the set pressure, the water pump starts. Another method is to set a timed water supply, which is divided into several time periods. Generally, the constant pressure water supply controller has the above-mentioned functions.
6. Hardware problem
When the transformer of the inverter has a problem, it cannot measure the correct current normally. Similar situations may also occur. In addition, a certain measuring component on the mainboard is aging, which may also happen. These are often encountered when repairing the inverter.