1 DC1 device series
1.8 Output reduction (derating)
DC1 Variable Frequency Drive 04/16 MN04020003Z-EN www.eaton.com 29
1.8 Output reduction (derating)
Derating the DC1 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 DC1 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 permissible ambient temperature Derate:
without derating with derating
IP20 50 °C 50 °C
1)
none
IP66
40 °C 50 °C 2.5 % per K
1) 45 °C for continuous operation for 24 hours, as per UL, for DC1-12011…B-A20N and
DC1-32011…B-A20N
Enclosure degree
of protection
permissible Altitude Derate:
without derating with derating
IP20, IP66 1000 m 2000 m (4000 m) 1 % per 100 m
Enclosure degree
of protection
Switching frequency (P-17), setting (audible)
1)
4 kHz 8 kHz 12 kHz 16 kHz 24 kHz 32 kHz
IP20
none none 20 % 30 % 40 % 50 %
IP66
none 10 % 25 % 35 % 50 % 50 %
1) The switching frequency’s effective rms value will be approximately half the value set with parameter P-17
(double modulation).
For more information on the subject of derating, please refer
to Application Note AP040038EN, “DC1 Variable Frequency
Drives – Dependency of the output current on switching
frequency and ambient temperature”.
ftp://ftp.moeller.net/DRIVES/POWERXL/01_APPLICATION_NOTE/
Deutsch/DC1/AP040038DE_DC1_Derating.pdf
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