ABB ACS180, Руководство по оборудованию, Страница: 95 / 168

Note:
• I
max
is not derated.
• The motor can also have a derating on it.
• You can also use the DriveSize tool for derating.
See Surrounding air temperature derating (page 97) , Altitude derating (page 99)
and Switching frequency derating (page 99) for the derating values.
Example 1, IEC: How to calculate the derated current
The drive type is ACS180-04x-17A0-4, which has a nominal output current ( I
N
) of
17 A at 400 V. Calculate the derated output current at 4 kHz switching frequency,
at 1500 m altitude and at 55 °C surrounding air temperature.
Switching frequency derating: Derating is not necessary at 4 kHz.
Altitude derating: The derating factor for 1500 m is
Surrounding air temperature derating: According to the temperature derating
table, the derating factor of 17A0-4 drive's nominal output current at 55 °C
surrounding air temperature is 0.775.
Multiply the nominal drive output current by all the applicable derating factors. In
this example, the derated output current becomes
Example 1, UL (NEC): How to calculate the derated current
The drive type is ACS180-04x-17A0-4, which has light-duty output current ( I
Ld
) of
14 A at 480 V. Calculate the derated output current at 4 kHz switching frequency,
at 6000 ft altitude and at 131 °F surrounding air temperature.
Switching frequency derating: Derating is not necessary at 4 kHz.
Altitude derating: The derating factor for 6000 ft is
Surrounding air temperature derating: According to the temperature derating
table, the derating factor of 17A0-4 drive's light-duty output current at 131 °F
surrounding air temperature is 0.775.
Multiply the drive output current by all the applicable derating factors. In this
example, the derated output current becomes
Technical data 95