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11.8. Derating Information
Derating of the drive maximum continuous output current capacity is require when:
Operating at ambient temperature in excess of 40°C / 104°F (IP55 & IP66) or 50°C / 122°F (IP20).
Operating at Altitude in excess of 1000m/ 3281 ft.
Operation with Effective Switching Frequency higher than 8kHz for IP20 models and 4kHz for IP55/IP66 models.
The following derating factors should be applied when operating drives outside of these conditions.
11.8.1. Derating for Ambient Temperature
Enclosure Type
IP20
IP20 Frame Size 5
IP55
IP66
11.8.2. Derating for Altitude
Enclosure Type
IP20
IP55
IP66
11.8.3. Derating for Switching Frequency
Enclosure
Frame
Type
IP66
IP55
IP20
11.8.4. Example of Applying Derating Factors
A 4kW, IP66 drive is to be used at an altitude of 2000 metres above sea level, with 16 kHz switching frequency and 45°C ambient
temperature.
From the table above, we can see that the rated current of the drive is 9.5 Amps at 40°C,
Firstly, apply the switching frequency derating (if any), 16 kHz, 0% derating.
Now, apply the derating for higher ambient temperature, 2.5% per °C above 40°C = 5 x 2.5% = 12.5%
9.5 Amps x 87.5% = 8.3 Amps.
Now apply the derating for altitude above 1000 metres, 1% per 100m above 1000m = 10 x 1% = 10%
8.3 Amps x 90% = 7.5 Amps continuous current available.
11
If the required motor current exceeds this level, it will be necessary to either:
Reduce the switching frequency selected; or
Use a higher power rated drive and repeat the calculation to ensure sufficient output current is available.
72 | Optidrive Eco User Guide | Version 3.06
Maximum Temperature
Without Derating
50°C / 122°F
35°C / 95°F
40°C / 104°F
40°C / 104°F
Maximum Temperature
Without Derating
1000m / 3281ft
1000m / 3281ft
1000m / 3281ft
4kHz
8kHz
Size
2
N/A
N/A
3
N/A
N/A
4
N/A
N/A
5
N/A
N/A
6
0%
16%
7
0%
12%
2
N/A
N/A
3
N/A
N/A
4
N/A
N/A
5
N/A
N/A
6
0%
N/A
8
0%
N/A
Derate by
1. 1 % per °C (1.8°F)
1.5% per °C (1.8°F)
2.5% per °C (1.8°F)
Derate by
1% per 100m / 328 ft
1% per 100m / 328 ft
1% per 100m / 328 ft
Switching Frequency (Where available)
10kHz
12kHz
14kHz
0%
0%
0%
0%
0%
0%
0%
0%
12%
0%
0%
1 1%
N/A
28%
N/A
N/A
N/A
N/A
0%
14%
23%
0%
2%
13%
0%
15%
13%
0%
3%
9%
N/A
N/A
N/A
N/A
N/A
N/A
Maximum Permissible
N/A
50°C / 122°F
50°C / 122°F
50°C / 122°F
50°C / 122°F
Maximum Permissible
4000m / 13123 ft
4000m / 13123 ft
4000m / 13123 ft
16kHz
18kHz
20kHz
0%
0%
0%
6%
N/A
N/A
23%
33%
41%
23%
36%
42%
39%
N/A
N/A
N/A
N/A
N/A
32%
37%
43%
19%
25%
35%
39%
52%
62%
14%
19%
24%
N/A
N/A
N/A
N/A
N/A
N/A
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24kHz
32kHz
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
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