WEG CFW-11 Series User Manual page 84

Depending on the inverter operational conditions, as the surrounding air temperature and the output frequency, the maximum time for operation
of the inverter with overload may be reduced.
(3) The motor power ratings are merely a guide for 230 V or 460 V, IV pole WEG motors. The adequate inverter sizing must be based on the used
motor rated current.
(4) The information provided about the inverter losses is valid for the rated operating condition, i.e., for rated output current and rated switching
frequency.
(5) The dissipated power provided for flange mounting corresponds to the total inverter losses disregarding the power module (IGBT and rectifier)
losses.
I
o
I
nom ND
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0 10 20 30 40 50
(a) IGBTs overload curve for the Normal Duty (ND) cycle
I
o
I
nom HD
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0 10 20 30 40 50
(b) IGBTs overload curve for the Heavy Duty (HD) cycle
Figure 8.1 (a) and (b) - Overload curves for the IGBTs
60 70 80 90 100 110 120
60 70 80 90 100 110 120
Technical Specifications
∆ t (s)
∆ t (s)
8
8-3