I
n
Nominal output current. Maximum continuous rms output current
allowed (no overload).
P
n
Typical motor power in nominal use (no overloading). The kilowatt
ratings are applicable to most IEC 4-pole (400 V, 50 Hz) motors. The
horsepower ratings are applicable to most NEMA 4-pole ( 460V ,
60Hz) motors.
I
Ld
Maximum output current with 110% overload, allowed for one minute
every ten minutes.
P
Ld
Typical motor power in light-duty use (110% overload).
I
Hd
Maximum output current with 150% overload, allowed for one minute
every ten minutes.
P
Hd
Typical motor power in heavy-duty use (150% overload).
￭
Sizing
ABB recommends the DriveSize tool for selecting the drive, motor and gear
combination (https://new.abb.com/drives/software-tools/drivesize). You can
also use the ratings tables.
The minimum recommended nominal current of the motor is 40% of the drive
nominal output current (
I
n
) . If the motor has a lower nominal current rating than
this, the drive cannot accurately measure the motor current.
Output derating
The load capacity (
I
n
,
I
Ld
,
I
Hd
) decreases in some situations. In such situations,
where full motor power is required, oversize the drive so that the total derated
output current is sufficient for the motor to reach the full power.
In an environment where more than one type of derating is necessary (for example,
high altitude and high temperature), the effects of derating are cumulative.
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 104), Altitude derating (page 107)
and Switching frequency derating (page 107) 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.
Technical data 101
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