In the operation of the motor, the running current exceeds the rated value but is less than the over-current limit value, and the operation time is longer, which is called overload.
The basic characteristics of overload are: Although the current exceeds the rated value, the excess amplitude is not large, and generally does not form a large impact current (otherwise, it will become an over-current fault). Another significant feature of overload is that there is a time accumulation process. When the accumulation time reaches, the overload fault is reported.
Solution: Check the VFD's power/current is bigger than the load or not.
Make sure that the grounding is good. And use shielded cables, separate power cables and control cables, or add EMC filters or magnetic rings.
The motor is mainly caused by the formation of over-voltage as long as the speed of the motor is bigger than the inverter's output speed, the motor will produce a power generation effect, charging the inverter. In engineering, the inverter over-voltage phenomenon is complicated, but we follow the motor as long as there will be a power generation effect, external energy interference, as long as to find out the interference to the motor, the problem is solved. Negative pressure, the formation of cavitation phenomenon, the negative pressure of the water from the frequency conversion pump inhalation, driving the impeller rotation, so that the motor speed is higher than the inverter output speed, motor power generation.
Solution: add braking units and resistors on the inverter.
GD series inverter is used in driving large inertia load, such as centrifuge, sanding machine, fan and so on. The load is consistent with the rated parameters of the inverter, that is, some OV or OC faults will be reported during deceleration. If you encounter these elements: speed mode, large inertia and deceleration alarm failure, then try to change P04.09 to 0, which can basically solve most of the problems.