Abstract: A method for fixing an output power limit of a frequency converter includes determining voltage differences between two DC-link circuit capacitors for each of two different values of an output power of a frequency converter; determining a percentile value for each voltage difference by rejecting values higher than the determined percentile. A method also includes comparing a value of an output power limit Poutlimit of a frequency converter which is fixed; assessing conditions of the DC-link capacitors, wherein when the value of the nominal power Pn is higher than the fixed output power limit Poutlimit the frequency converter is used conditionally with the power Pi lower than the fixed output power limit Poutlimit without replacement of the at least two DC-link capacitors or at least two blocks of DC-link capacitors, where i=(1, 2 . . . , n).