Eaton PowerXL - Output Reduction (Derating)

1 Device series DC1-S…
1.8 Output reduction (derating)
DC1-S…20…, DC1-S…OE1 Variable Frequency Drives 05/21 MN040058EN www.eaton.com 21
1.8 Output reduction (derating)
Derating the DC1-S… 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-S… 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 air temperature Derate
without derating with derating
IP20 50 °C 50 °C none
IP66 40 °C 50 °C 2.5 % per K
Enclosure degree
of protection
Permissible altitude Derate
without derating with derating
IP20, IP66 1000 m 2000 m – with UL Certification
4000 m maximum – without UL
Certification
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).