1 DA1 device series
1.8 Output reduction (derating)
32 DA1 Variable Frequency Drives 11/16 MN04020005Z-EN www.eaton.com
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 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 degree
of 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
IP5 40 °C 1.5 % per K 50 °C
IP66 40 °C 2.5 % per K 50 °C
Enclosure degree
of 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 degree
of 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.
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