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A-17
Calorific values of inverters and amount of air to be ventilated
The VF-A7 series of inverter loses about 5% of energy when switching electric currents from AC,
DC, then to AC. To limit a temperature rise due to this energy loss, it is necessary to forcefully
ventilate and cool down the cabinet in which the inverter is installed.
The table below lists the amounts of air to be ventilated forcefully and the heat radiation areas
required for closed-type cabinets containing an inverter.
Voltage
class
Applicable
motor
(kW)
Calorific value
of inverter
(W)
Amount of air to be
ventilated forcefully
(m
3
/min.)
Heat radiation area required
for closed-type
cabinet
(m
2
)
0.4
50
0.29
1.0
0.75
70
0.40
1.4
1.5
110
0.63
2.2
2.2
140
0.80
2.8
3.7
220
1.3
4.4
5.5
310
1.8
6.2
7.5
420
2.4
8.4
11
580
3.3 11.6
15
770
4.4 15.4
18.5
940
5.4 18.8
22 1110
6.3 22.2
30 1490
8.5 29.8
37 1530
8.7 30.6
45 1850 10.5 37.0
55 2250 12.8 45.0
75 3050 17.4 61.0
200V
90 3650 20.8 73.0
0.75
70
0.40
1.4
1.5
110
0.63
2.2
2.2
140
0.80
2.8
3.7
220
1.3
4.4
5.5
280
1.6
5.6
7.5
370
2.1
7.4
11
530
3.0 10.6
15
710
4.0 14.2
18.5
800
4.6 16.0
22
940
5.4 18.8
30 1270
7.2 25.4
37 1270
7.2 25.4
45 1490
8.5 29.8
55 1810 10.3 36.2
75 2300 13.1 46.0
90 2750 15.7 55.0
110 3350 19.1 67.0
132 4010 22.9 80.2
160 4850 27.6 97.0
220 6650 37.9 133.0
400V
280 8450 48.2 169.0
Note)The calorific values in the above table do not include those of optional external devices
(such as input reactors, DC reactors and radio noise filters).