E6581442
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 sealed
storage cabinet
(m
2
)
0.4 50
25
0.29 1.0
0.75 70
28
0.40 1.4
1.5 113
32
0.65 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
22 865
124
5.0 17.3
30 1140
152
6.6 22.8
37 1340
167 7.7 26.8
45 1570
185 9.0 31.4
55 1720
154 9.9 34.4
200V
75 2210
154
12.7 44.2
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
400V
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 indented for motors with
capacities of 355kW and above, 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%.
Note3: This value is power dissipated inside the enclosure with using heatsink outer option.
