MOUNTING vacon • 31
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5
5.7 Power losses
The power loss of the frequency converter varies greatly with load and output frequency as well as
with the switching frequency used. For dimensioning of cooling or ventilation equipment for
electrical rooms the following generic formula gives a good approximation of the heat losses for
NXC 6- and 12-pulse drives at nominal conditions.
P
loss
[kw] = P
mot
[kW] x 0,025
Heat losses of NXC low-harmonic drives are roughly 1,5...2 times more compared to 6-p and 12-
pulse. Additional information on heat losses for specific frame size and current class is available
on request.
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