1 DA1 device series
1.8 Output reduction (derating)
DA1 Variable Frequency Drives
08/18 MN04020005Z-EN
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35
1.8 Output reduction (derating)
Derating the DA1 variable frequency drive / limiting the maximum continuous
output current (I
2
) will generally be necessary if, during operation:
•
The ambient air temperature is higher than 40 °C,
•
An installation altitude of 1,000 m is exceeded,
•
The effective switching frequency is higher than the minimum value.
The following tables specify the factors that need to be applied when
selecting a DA1 variable frequency drive if the drive will be run outside these
conditions:
Derating for ambient temperature
Derating for installation altitude
Derating for switching frequency
Enclosure version
for IP protection
Maximum ambient
temperature without derating
Derate
Maximum permissible
ambient air
temperature
IP20
50°C
None
50°C
IP40
1)
40°C
None
40°C
IP55
40°C
1.5% per K
50°C
IP66
40°C
2.5% per K
50°C
Enclosure version
for IP protection
Maximum height without
derating
Derate
Maximum permissible
altitude as per IEC (UL)
IP20, IP40
1)
,
IP55, IP66
1000 m
1% per 100 m
4000 m (2000 m)
Enclosure version
for IP protection
Switching frequency (P2-24), setting (audible)
2)
4 kHz
8 kHz
12 kHz
16 kHz
24 kHz
32 kHz
IP20
None
None
20%
30%
40%
50%
IP40
1)
None
None
10%
15 %
25 %
Do not set
IP55
None
10 %
10%
15%
25%
Do not set
IP66
None
10%
25%
35%
50%
50%
1) DA1 variable frequency drive with IP55 enclosure and connection area open from below (without blanking plate
and cable glands).
2) The pulse frequency's effective rms value will be approximately half the value set with parameter P2-24 (double
modulation).
￫
For more information on the subject of “derating”, please refer
to application note AP040039EN.
You can find the document on the Internet under the following
address:
ftp://ftp.moeller.net/DRIVES/POWERXL/01_APPLICATION_NOTE/Deutsch/DA1/AP040039DE_DA1_Derating.pdf
