If there is no damage to the hardware, the maximum torque output of the inverter is generally less than the load to increase the torque.
The acceleration time is too short
Theoretically, the longer the acceleration time, the stronger the ability to increase the load, the setting acceleration time is too short, some inverters will display overcurrent or overload and overheating alarms, etc., but some will not be displayed, just stuck in a certain frequency segment.
The V/F ratio is too large
Some inverters are also called torque increase, this parameter is set too large, sometimes the minutes will not be able to start normally, and a proper reduction will solve the problem.
Vector manipulation parameters do not match
After running for a period of time, the motor parameters are overheated to form an offset, and the current will be too large, and the motor can not be started normally, and the frequency may also be stuck at a certain point.
The maximum frequency and maximum frequency are set too low
Generally, these two parameters are set to the maximum value, but some careless electricians who do not sweep away these two parameters have changed these two parameters, so it will also form a failure to increase the frequency.
Some special occasion parameters require pairing
In some cases, the minimum frequency can not be set too low, for example, in the constant pressure water supply system, after the minimum frequency is set to 0Hz, when the pump pressure is low, the inverter starts to speed up when the starting frequency of the inverter is exceeded, and the pressure cannot be increased, and the frequency of the inverter can not be increased to 50Hz, only about 38Hz. Only when the minimum frequency of the inverter is set to about 15-20HZ, the acceleration of the inverter can be satisfied, and the constant pressure of the water pump can be reached to a certain pressure position. Although the pressure meets the requirements of constant pressure, when no water is used, the inverter cannot be completely stopped, and the speed of the lowest frequency is maintained all the time.
This is due to: in the constant pressure water supply system, the minimum frequency of the inverter cannot be set to 0HZ, generally at least about 20HZ, which is determined by the flow rate and head of the pump.
The solution is to set the sleep frequency, when the pump does not use water at the frequency (for example, 28HZ) for a few minutes, the pump sleeps, and when the pressure drops to 0.2-0.4MP lower than the set pressure, the pump starts. Another way is to set up punctual water supply, punctual water supply in several time periods, generally constant pressure water supply controllers have the functions mentioned above.
Hardware issues
After the transformer (Hall) of the inverter presents a problem, it cannot measure the correct current normally, or it may produce a similar situation, and a measurement component on other motherboards is aging, which will also occur when repairing the inverter.
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