Toshiba VF-PS1 Instruction Manual page 37

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 Applicable Motor
class (kW)
0.4
0.75
1.5
2.2
3.7
5.5
7.5
11
200V 15
18.5
22
30
37
45
55
75
90
0.75
1.5
2.2
3.7
5.5
7.5
11
15
18.5
22
30
37
45
400V
55
75
90
110
132
160
220
250
280
315
400
500
630
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 indented for motors with
capacities of 400kW 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  (carrier frequency) under a load factor of 100%.
Amount of forced air cooling
Calorific values
ventilation required
(W)
(m
50
70
113
135
191
307
408
593
692
800
865
1140
1340
1570
1720
2240
2700
57
82
112
136
262
328
448
577
682
720
980
1180
1360
1560
2330
2410
2730
3200
3980
5404
6279
6743
7749
9433
11853
14751
A-25
Heat exchange surface area
required for sealed storage
3
/min)
0.29
0.40
0.65
0.78
1.1
1.8
2.4
3.4
4.0
4.6
5.0
6.6
7.7
9.0
9.9
12.8
15.4
0.33
0.47
0.64
0.78
1.5
1.9
2.6
3.3
3.9
4.2
5.6
6.8
7.8
9.0
13.4
13.8
15.6
18.3
22.7
30.8
35.8
38.4
44.2
53.8
67.6
84.1
E6581386
cabinet
(m 2 )
1
1.0
1.4
2.3
2.7
3.8
6.2
8.2
11.9
13.9
16.0
17.3
22.8
26.8
31.4
34.4
44.8
54.0
1.2
1.7
2.3
2.8
5.3
6.6
9.0
11.6
13.7
14.4
19.6
23.6
27.2
31.2
46.6
48.2
54.6
64.0
79.6
108.1
125.6
134.9
155.0
188.7
237.1
295.0