What are the dots flashing on the display of my frequency inverter?
Flashing dots means that the drive is operating in an overload condition. The output current is greater than what is set in the 'Motor Rated Current' parameter.
The drive will operate in the overload region for a short period of time before tripping out in order to protect the motor from sustained overload/over-current. If this starts occurring unexpectedly then it is generally not a fault of the frequency inverter but a change in motor load or operating conditions.
The frequency inverter and motor might have been rated such that the drive is momentarily in an overload condition during acceleration and this should not present a problem for the drive provided the duration of the overload is within the time limits permitted.
If this occurs unexpectedly during commissioning then check drive and motor are sized correctly, check drive motor parameters have been configured correctly, check motor cable lengths are within specification, check mechanical load for jams or blockages, and try increasing acceleration times.