Toshiba Tosvert VF-AS1 User Manual
Page 39
E6581301
A-23
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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)
Amount of forced air cooling
ventilation required
(m
3
/min)
Heat exchange surface area
required for sealed storage
cabinet
(m
2
)
0.4
50
0.29
1.0
0.75
70
0.40
1.4
1.5
113
0.65
2.3
2.2
135
0.78
2.7
3.7/4.0
191
0.92
3.2
5.5
307
1.8
6.2
7.5
408
2.4
8.2
11
593
3.4
11.9
15
692
4.0
13.9
18.5
800
4.6
16.0
22
865
5.0
17.3
30
1140
6.6
22.8
37
1340
7.7
26.8
45
1570
9.0
31.4
55
1720
9.9
34.4
200V
75
2210
12.7
44.2
0.75
57
0.33
1.2
1.5
82
0.47
1.7
2.2
112
0.64
2.3
3.7/4.0
136
0.78
2.8
5.5
262
1.5
5.3
7.5
328
1.9
6.6
11
448
2.6
9.0
15
577
3.3
11.6
18.5
682
3.9
13.7
22
720
4.2
14.4
30
980
5.6
19.6
37
1180
6.8
23.6
45
1360
7.8
27.2
55
1560
9.0
31.2
75
2330
13.4
46.6
90
2410
13.8
48.2
110
2730
15.6
54.6
132
3200
18.3
64.0
160
3820
21.9
76.4
200
4930
28.2
98.6
220
5405
30.9
108.1
280
6830
39.1
136.6
355
400
400V
500
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.
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%.