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E6581301
A-28
1
■
■■
■ Calorific values of the inverter and the required ventilation
The energy loss when the inverter converts power from AC to DC and then back to AC is about 5%. In order to
suppress the rise in temperature inside the cabinet when this loss becomes heat loss, the interior of the cabinet must
be ventilated and cooled.
The amount of forced air-cooling ventilation required and the necessary heat exchange surface area when operating
in a sealed cabinet according to motor capacity are as follows.
Voltage
class
Applicable Motor
(kW)
Calorific values
(W)
Part of inside
calorific values
(W)
(note3)
Amount of
forced
air cooling ventilation
required
(m
3
/min)
Heat
exchange
surface
area required for seal
ed
storage cabinet
(m
2
)
200V
0.4
50
25
0.2
9
1.0
0.75
70
28
0.
40
1.4
1.5
113
32
0.6
5
2.
3
2.2
135
39
0.
78
2.
7
3.7
/4.0
191
40
1.1
3.8
5.5
307
60
1.
8
6.2
7.5
408
72
2.
4
8.2
11
593
83
3.
4
11.9
15
692
91
4.0
13.9
18.5
800
120
4.6
16.0
22
86
5
124
5.0
17.3
30
1140
152
6.6
2
2
.8
37
1340
167
7
.7
26.8
45
1570
185
9.0
31.4
55
1720
154
9.9
34.4
75
2210
154
12.7
44.2
400V
0.75
57
28
0.
33
1.2
1.5
82
30
0.
47
1.7
2.2
112
33
0.
64
2.3
3.7
/4.0
136
41
0.78
2.8
5.5
262
58
1.
5
5.3
7.5
328
66
1.9
6.6
11
448
77
2.6
9.0
15
577
104
3.3
11.6
18.5
682
106
3.9
13.7
22
720
111
4.2
14.4
30
980
134
5.6
19.6
37
1180
138
6.8
23.6
45
1360
165
7.8
27.2
55
1560
179
9.0
31.2
75
2330
226
13.4
46.6
90
2410
237
13.8
48.2
110
2730
261
15
.6
54.6
132
3200
296
18.3
64.0
160
3820
350
21.9
76.4
200
4930
493
28.2
98.6
220
5405
586
30.9
108.1
280
6830
658
39.1
136.6
355
7960
-
45.5
159.2
400
9300
-
53.2
186.0
500
11400
-
65.2
228.0
Note1: The heat loss for the optional external devices (input reactor, DC reactor, radio noise reduction filters, etc.) is
not included in the calorific values in the table. With the exception of inverters
LGHQWLILHG
for motors with
capacities of 355kW and more, in which case the calorific value of the DC reactor is included.
Note2: Each calorific value in the table refers to the quantity of heat that an inverter produces when it is operated
continuously at the factory default EH (carrier frequency) under a load factor of 100%.
Note3: This value is power dissipated inside the enclosure
ZKHQ
using heatsink
RXWWKHEDFNIODQJHPRXQW
option.