For a continuously running VFD (Variable-frequency Drive), the operating status can be visually checked from the outside.
Regularly inspect the VFD (Variable-frequency Drive) to check if there are any abnormalities during operation.
The following checks should usually be made:-
(1) Whether the ambient temperature is normal, which should be within the range of -10°C to +40°C, preferably around 25°C;
(2) Whether the output current, voltage, frequency and other data displayed on the display panel of the VFD (Variable-frequency Drive) are normal;
(3) Whether the characters displayed on the display panel are clear or missing;
(4) Use a temperature measuring instrument to detect whether the VFD (Variable-frequency Drive) is overheated or has any odor;
(5) Whether the VFD (Variable-frequency Drive) fan is running normally, whether there are any abnormalities, and whether the heat dissipation duct is unobstructed;
(6) Whether there is a fault alarm display during the operation of the VFD (Variable-frequency Drive);
(7) Check whether the AC input voltage of the VFD (Variable-frequency Drive) exceeds the maximum value. The limit is 418V (380V×1.1). If the input voltage of the main circuit exceeds the limit, the VFD (Variable-frequency Drive) circuit board will be damaged even if the VFD (Variable-frequency Drive) is not running.