WEG CFW-11 User Manual page 79

(2) Table 8.1 presents only two points of the overload curve (activation time of 1 min and 3 s). The complete
information about the IGBTs overload for Normal and Heavy Duty Cycles is presented below.
I
o
I
RAT 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
(a) IGBTs overload curve for the Normal Duty (ND) cycle
I
o
I
RAT HD
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0
(b) IGBTs overload curve for the Heavy Duty (HD) cycle
Depending on the inverter usage conditions (surrounding air temperature, output frequency, possibility or not
of reducing the carrier frequency, etc.), the maximum time for operation of the inverter with overload may be
reduced.
(3) The carrier frequency may be automatically reduced to 2.5 kHz depending on the operating conditions
(surrounding air temperature, output current, etc.) - if P0350=0 or 1.
If it is necessary to operate always in 5 kHz, set P0350=2 or 3 and consider the nominal current values of the
table 8.2 and 8.3. Note that in this case it is necessary to apply the derating to the nominal output current.
(4) The motor ratings are merely a guide for 230 V or 460 V, IV pole WEG motors. The adequate inverter sizing
shall be based on the rated current of the motor used.
(5) The information provided about the inverter losses is valid for the rated operating condition, i.e., for rated
output current and rated carrier frequency.
(6) The dissipated power provided for flange mounting corresponds to the total inverter losses disregarding the
power module (IGBT and rectifier) losses.
10 20 30 40 50 60 70 80
10 20 30 40 50 60 70 80
Figure 8.1 (a) and (b) - Overload curves for the IGBTs
Technical Specifications
∆ t (s)
90 100 110 120
∆ t (s)
90 100 110 120
8
8-3