Output Reduction (Derating) - Eaton PowerXL DC1 20 Series Installation Manual

1.8 Output reduction (derating)

Derating the DC1 variable frequency drive / limiting the maximum continuous
output current (I ) will generally be necessary if, during operation:
2
• 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
Enclosure degree Maximum permissible ambient air temperature
of protection
without
derating
IP20 50 °C
IP66 40 °C
1) 45 °C for continuous operation for 24 hours, as per UL, for DC1-12011...B-A20CE1 and DC1-32011...B-A20CE1
Derating for installation altitude
Enclosure degree permissible altitude
of protection
without
derating
IP20, IP66 1000 m
Derating for switching frequency
Enclosure degree Switching frequency (P-17), setting (audible)
of protection
4 kHz
IP20 none
IP66 none
1) The switching frequency's effective rms value will be approximately half the value set with parameter P-17
(double modulation).
DC1...20... and DC1...OE1 Variable Frequency Drives 02/20 MN040059EN www.eaton.com
1.8 Output reduction (derating)
with
derating
1)
50 °C
50 °C
with
derating
2000 m – with UL Certification
4000 m maximum – without UL
Certification
8 kHz 12 kHz
none 20 %
10 % 25 %
1 DC1 device series
Derate
none
2.5 % per K
Derate
1 % per 100 m
1)
16 kHz 24 kHz
30 % 40 %
35 % 50 %
32 kHz
50 %
50 %
29