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A: First of all, we hneed to eliminate the fault caused by the parameter problem. For example, the deceleration time is too short, and the over-voltage caused by regenerative load (add braking unit), then we can check whether there is a problem with the voltage at the input side. Finally, we can see whether there is a fault in the voltage detection circuit. Generally, the voltage sampling point of voltage detection circuit is the voltage of intermediate DC circuit.
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