User manual

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

) 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

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)

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