The anti-stall function of Mitsubishi inverters mainly includes two aspects:
1. If the preset acceleration time is too short, it is easy to trip due to overcurrent.
2. If the acceleration time is too long, it will affect the operating efficiency of the industrial electrical automation machine. Moreover, the working conditions of the production machine also change from time to time, which brings difficulties to the user when presetting the "acceleration time", and it is difficult to preset the right time quickly.
3. When the Mitsubishi frequency inverter has overcurrent during acceleration, it is not necessary to trip, but start the "prevent trip" program (also called the automatic processing program).
The specific method is: if the current exceeds the preset upper limit (ie the maximum allowable value of the acceleration current) during acceleration, the output frequency of the Mitsubishi inverter will no longer increase, and the acceleration will be suspended temporarily until the current drops to the upper limit. Then continue to accelerate after the following.
For loads with large inertia, if the deceleration time is preset to be too short, the function of the drag system will release too fast and cause overvoltage in the DC circuit.
If the DC voltage exceeds the upper limit during the deceleration of the Mitsubishi industrial automation inverter (that is, the maximum allowable DC voltage), the output frequency of the Mitsubishi inverter will no longer decrease, and the deceleration will be suspended temporarily. Continue to decelerate after the DC voltage drops below the set value. We often call this function an anti-stall function.