Power Electronics SD750 Series - Page 36

SD750
POWER ELECTRONICS
34
MECHANICAL INSTALLATION
The following figure identifies the gratings and extraction fans of the different levels.
SD750 gratings and fans
FRAMES
ID
1
2
3
4
5
6
7
8
9
10
11
AREA 2
OPERATION
FLOW (m
3
/h) (*)
D
64-77
239-287
306-367
342-410
396-475
486-583
720-
864
972-
1166
1458-
1750
2178-
2614
2898-
3478
INLET GRATING
NET SECTION
(m
2
)
A
0.081
0.016
0.025
0.031
0.034
0.064
0.101
0.123
0.192
0.303
0.369
OUTLET
GRATING NET
SECTION (m
2
)
D
0.003
0.013
0.017
0.019
0.022
0.027
0.040
0.054
0.081
0.121
0.161
AREA 3
OPERATION
FLOW (m
3
/h)
C
-
-
-
180
360
720
1080
1440
2160
3240
4320
INLET GRATING
NET SECTION
(m
2
)
B
0.081
0.016
0.025
0.031
0.034
0.041
0.041
0.041
0.122
0.122
0.122
Heat dissipation
The heat generated by the SD750 depends on the carrier frequency (Hz), the grid frequency and the
load. It can be estimated by the following equation, considering the worst case at rated power condition.
P
loss
[W] = 0,02 · P
motor
[W]
(*) The air velocity, which passes through the gratings, varies between 5 and 6 m/s depending on the blocking of the
gratings.