WEG CFW-11 Series - Page 134

Technical Specications
8
8-6 | CFW-11
Notes for Table 8.1 on page 8-2 to Table 8.4 on page 8-5:
(1) Steady state rated current in the following conditions:
- Indicated switching frequencies or lower. For higher switching frequency consult WEG.
- Models on frame sizes E, F, G and H are not allowed to operate at 10 kHz switching frequency.
- Surrounding air temperature as specified in tables. From 40 ºC to 45 ºC (104 ºF to 113 ºF) for frame size H: 1 % of current derating for each Celsius
degree above maximum temperature as specified in item above. From 50 ºC to 60 ºC (122 °F to 140 °F) for frame sizes B, C and D models and from
45 ºC to 55 ºC (113 ºF to 131 ºF) for frame sizes E, F, G and H models: 2 % of current derating for each Celsius degree above maximum temperature
as specified in item above.
- Relative air humidity: 5 % to 95 % non-condensing.
- Altitude: 1000 m (3.300 ft). Above 1000 m (3.300 ft) up to 4000 m (13.200 ft) the output current must be derated by 1 % for each 100 m (330 ft)
above 1000 m (3.300 ft).
- Ambient with pollution degree 2 (according to EN50178 and UL508C).
(2) One overload each 10 minutes. Table 8.1 on page 8-2 to Table 8.4 on page 8-5 present only two points of the overload curve (activation time
of 1 min and 3 s). The complete IGBT overload curves for Normal Duty (ND) and Heavy Duty (HD) cycles are presented in Figure 8.1 on page 8-6.
Depending on the inverter operational conditions such as surrounding air temperature and output frequency, the maximum time for operation of the
inverter with overload may be reduced.
(3) Maximum output current of these models. The overload time for frame size H in heavy cicles is 5 s.
(4) Only for frame sizes B, C and D: the switching 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 desired to operate always in 5 kHz, set P0350 = 2 or 3 and derate the output current. For additional information, consult WEG.
(5) Motor power ratings are merely a guide considering 575 V, 60 Hz for 500 to 600 Vac supply, or 690 V, 50 Hz for 660 to 690 Vac supply, IV pole WEG
motors. The adequate inverter sizing must be based on the used motor rated current.
(6) The information provided about the inverter losses are valid for the rated operating condition, i.e., for rated output current and rated switching frequency.
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 60 70 80 90 100 110 120
I
o
I
nom ND
∆ t (s)
Attention!
One overload each 10 minutes.
(a) IGBTs overload curve for the Normal Duty (ND) cycle
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 60 70 80 90 100 110 120
I
o
I
nom HD
∆ t (s)
Attention!
One overload each 10 minutes.
(b) IGBTs overload curve for the Heavy Duty (HD) cycle
Figure 8.1 - (a) and (b) - IGBT overload curves for ND and HD use