In actual production, the frequency of the inverter cannot be adjusted up, generally because the maximum torque output by the inverter is less than the load lifting torque.
1. Acceleration time is too short
Theoretically, the longer the acceleration time, the stronger the load lifting capability will be. If the acceleration time is set too short, some inverters will display overcurrent or overload and overheat alarms, etc., but some will not display it and will just get stuck in a certain state. Can't go up to one frequency range.
2.V/F ratio is too large
If this parameter is set too large, it will not start normally. Adjusting the appropriate parameters can solve the problem.
3. The maximum frequency and maximum frequency are set too low
Generally, the two parameters of maximum frequency and maximum frequency are set to the maximum value. If these two parameters are modified, the frequency will not be increased.
4. Parameter mismatch
In the vector control mode, the internal resistance, inductance and other parameters of the motor need to be accurately measured and coordinated with the vector parameters of the inverter. After running for a period of time, the motor parameters will change due to overheating, which will cause excessive current and prevent the motor from starting normally. The frequency may also get stuck at a certain segment point, and you can just readjust the optimization parameters.
5. Special production parameter adjustment
In a practical case, in a constant pressure water supply system, after the minimum frequency is set to 0Hz, when the water pump pressure is low and exceeds the starting frequency of the frequency converter, the frequency converter starts to accelerate, and the pressure never increases, and the frequency converter frequency cannot be increased to 50Hz. It is only about 38Hz. I have repeatedly set and adjusted the PID, but the frequency still cannot go up. Only by setting the minimum frequency of the frequency converter to about 15-20HZ can the frequency converter accelerate to a sufficient level and maintain the water pump to a certain pressure position. Although the pressure meets the constant pressure requirements, when no water is used, the frequency converter cannot stop completely and always maintains the lowest frequency speed.
Reason: In a constant pressure water supply system, the minimum frequency of the frequency converter cannot be set to 0HZ. It is generally at least around 20HZ. This is determined by the flow rate and head of the water pump.
The solution is to set the sleep frequency. When the water pump runs at the frequency when it is not using water (for example, 28HZ) for a few 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, constant pressure water supply controllers have the functions mentioned above.
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