than or equal to the rated motor power. The power ratings are the same regardless of
the supply voltage within one voltage range.
Note: The ratings apply at ambient temperature of 40 °C (104 °F) for I
2
(I
Ld
for UL
(NEC)). Above theses temperatures derating is required.
Note: The DriveSize dimensioning PC tool available from ABB
(http://new.abb.com/drives/software-tools/drivesize) is recommended for selecting the
drive, motor and gear combination.
￭ Deratings
The output load capacity (I
2
, I
Ld
, I
Hd
; note that I
max
is not derated) decreases in certain
situations. In situations, where full motor power is required, oversize the drive so that
the total derated output current provides sufficient capacity to supply the required nominal
voltage to run the motor.
Note: The DriveSize dimensioning PC tool available from ABB
(http://new.abb.com/drives/software-tools/drivesize) is also suitable for derating.
Note: If several situations are present at a time, the effects of derating are cumulative:
I
2
(derated) or I
Ld
(derated) = (I
2
or I
Ld
) x (switching frequency derating) x (altitude
derating) x (ambient temperature derating), where no derating = 1.0.
Note: The motor may have a derating on it too.
Example 1, IEC: How to calculate the derated current
The IP21 / UL Type 1 drive type is ACH580-01-01-062A-4, which has drive output current
of 62 A. Calculate the derated drive output current (I
2
) at 4kHz switching frequency, at
1500 m altitude and at 50 °C ambient temperature as follows:
1.
Switching frequency derating by derating factor (page 246):
No derating needed for 4 kHz.
2.
Altitude derating (page 245):
The derating factor for 1500 m is 1 - 1/10 000 m · (1500 - 1000) m = 0.95.
The derated drive output current becomes I
2
= 0.95 · 62 A = 58.9 A.
3.
Surrounding air temperature derating, IP21 (UL Type 1) (page 242):
The derating factor for 50 °C ambient temperature = 0.90.
The derated drive output current becomes then I
2
= 0.90 · 58.9 A = 53.01 A.
Example 1, UL (NEC): How to calculate the derated current
The IP21 / UL Type 1 drive type is ACH580-01-01-052A-4, which has drive output current
of 52 A. Calculate the derated drive output current (I
Ld
) at 4kHz switching frequency, at
4921 ft (1500 m) altitude and at 50 °C ambient temperature as follows:
1.
Switching frequency derating by derating factor (page 246):
No derating needed for 4 kHz.
2.
Altitude derating (page 245):
240 Technical data
To Next Page
Loading...
