Emotron CDU/CDX 48-026 [5/8] Operation at higher temperatures

Emotron AB 01--4965--01r1 4

Operation at higher temperatures

Most Emotron variable speed drives are designed for

operation at maximum of 40°C ambient temperature.

However it is possible to use the VSD at higher temperatures

with little loss in performance.

Table 6 shows ambient temperature 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 29 A

Power 15 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 current capacity of

2.5%/°C.

Derating will be: 5 x 2.5% = 12.5%

Calculation for model CDU/CDX 48-031:

31 A - (12.5% x 31) = 27.1 A; this is not enough.

Calculation for model CDU/CDX 48-037

37 A - (12.5% x 37) = 32.4 A

In this example we select the CDU/CDX 48-037.

Operation at higher switching

frequency

Only valid for CDU.

Table 7 shows the switching frequency for the different VSD

models. With the possibility of running at higher switching

frequency you can reduce the noise level from the motor.

Note!

For switching Frequency >3 kHz contact Emotron AB

Table 6 Ambient temperature and derating for

400 – 525V types

Model

IP55

Max temp. Derating: possible

CDU/CDX 48/52

008 to - 046

40°C

-2.5%/°C to

max +10°C (50 C)

Table 7 Switching frequency

Models

Standard

Switching

frequency

Range

CDU/CDX 48/52

008 to - 046

3 kHz 1,5 – 6 kHz

Emotron CDU/CDX 48-026 [5/8] Operation at higher temperatures

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