164 Technical Data Emotron AB 01-4429-01r2
14.3 Operation at higher
temperatures
Most Emotron variable speed drives are made for operation
at maximum of 40°C ambient temperature. However, for
most models, it is possible to use the VSD at higher temper-
atures with little loss in performance. Table 44 shows ambi-
ent temperatures as well as derating for higher temperatures.
Example
In this example we have a motor with the following data that
we want to run at the ambient temperature of 45°C:
Voltage 400 V
Current 68 A
Power 37 kW
Select variable speed drive
The ambient temperature is 5 °C higher than the maximum
ambient temperature. The following calculation is made to
select the correct VSD model.
Derating is possible with loss in performance of 2.5%/°C.
Derating will be: 5 X 2.5% = 12.5%
Calculation for model VFX40-073
73 A - (12.5% X 73) = 63.875A; this is not enough.
Calculation for model VFX48-090
90 A - (12.5% X 90) = 78.75 A
In this example we select the VFX48-090.
Table 44 Ambient temperature and derating 400–690 V types
Model
IP20 IP54
Max temp. Derating: possible Max temp. Derating: possible
VFX**-003 to VFX**-046 – – 40°C -2.5%/°C to max +10°C
VFX**-060 to VFX40-073 40°C -2.5%/°C to max +10°C 35°C -2.5%/°C to max +10°C
VFX48-090 to VFX48-250
VFX69-090 to VFX48-175
– – 40°C -2.5%/°C to max +5°C
VFX48-300 to VFX48-1500
VFX69-210 to VFX69-1000
40°C -2.5%/°C to max +5°C 40°C -2.5%/°C to max +5°C
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