Derating Information - Invertek Drives ODL-2-22075-1KF42-SN Installation & Operating Instructions Manual

Derating Information

Derating of the drive maximum continuous output current capacity is required when:

Operating at ambient temperature in excess of 40°C / 104°F for enclosed drives (non UL approved)

Operating at Altitude in excess of 1000m/ 3281 ft

Operation with Effective Switching Frequency higher than the minimum setting
The following derating factors should be applied when operating drives outside of these conditions
Derating for Ambient Temperature
Enclosure Type
IP20
IP55
Derating for Altitude
Enclosure Type
IP20
IP55
Derating for Switching Frequency
Enclosure Type 4kHz
IP20 N/A
IP55 N/A
Example of applying Derating Factors
An 11kW, 380-480V IP55 drive is to be used at an altitude of 2000 metres above sea level, with 12 kHz switching frequency and 45°C ambient
temperature.
From the Output and Current ratings table 18.3.3, we can see that the rated current of the drive is 24 Amps at 40°C,
1. Apply the switching frequency derating, 12kHz, 10% derating : 24 Amps x 90% = 21.6 Amps
2. Now, apply the derating for higher ambient temperature, 1.5% per °C above 40°C :
a. 5 x 1.5% = 7.5%
b. 21.6 Amps x 92.5% = 20 Amps
3. Now apply the derating for altitude above 1000 metres, 1% per 100m above 1000m :
a. = 10 x 1% = 10%
b. 20 Amps x 90% = 18 Amps continuous current available.
If the required motor current exceeds this level, it will be necessary to either
- Reduce the switching frequency selected
- Use a higher power rated drive and repeat the calculation to ensure sufficient output current is available.
Technical Data
Optidrive P2 Elevator User Guide V2.30
Maximum Temperature
Without Derating
(UL Approved)
50°C / 122°F
40°C / 104°F
Maximum Altitude
Without Derating
1000m / 3281ft 1% per 100m / 328 ft
1000m / 3281ft 1% per 100m / 328 ft
8kHz
N/A
10%
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Derate by
N/A
1.5% per °C (1.8°F)
Derate by Maximum Permissible
Switching Frequency (Where available)
12kHz 16kHz
20% 30%
10% 15%
Maximum Permissible Operating
Ambient Temperature with
Derating (Non UL Approved)
Maximum Permissible
(UL Approved) (Non-UL Approved)
2000m / 6562 ft 4000m / 13123 ft
2000m / 6562 ft 4000m / 13123 ft
24kHz
40%
25%
69
50°C
50°C
32kHz
50%
N/A