ABB ACS580-01 drives, Hardware Manual

Page: 136 / 226

136 Technical data

Sizing
Drive sizing is based on the rated motor current and power. To achieve the rated
motor power given in the table, the rated current of the drive must be higher than or
equal to the rated motor current. Also the rated power of the drive must be higher
than or equal to compared to the rated motor power. The power ratings are the same
regardless of the supply voltage within one voltage range.
Note: For frames R0…R3 the ratings apply at ambient temperature of 50 °C (122 °F)
for I
N
. For frames R4…R9 in IP21, the ratings apply at ambient temperature of 40 °C
(104 °F) for I
N
. Above theses temperatures derating is required.
The DriveSize dimensioning tool available from the manufacturer is recommended for
selecting the drive, motor and gear combination.
Derating
The load capacity ( I
N
, I
Ld
, I
Hd
; note that I
max
is not derated) decreases for certain
situations, as defined below. In such situations, where full motor power is required,
oversize the drive so that the derated value provides sufficient capacity.
Note: If several situations are present at a time, the effect of derating for each
situation is cumulative.
Example:
If your application requires continuous 12.0 A of motor current (
I
N
) at 8 kHz switching frequency,
the supply voltage is 400 V and the drive is situated at 1500 m, calculate the appropriate drive
size requirement as follows:
Switching frequency derating (page 140 ):
The minimum size required is I
N
= 12.0 A / 0.66 = 18.18 A,
where 0.66 is the derating for 8 kHz switching frequency (frames R0…R3).
Altitude derating (page 140 ):
The derating factor for 1500 m is 1 - 1/10 000 m · (1500 - 1000) m = 0.95.
The minimum size required becomes then
I
N
= 18.18 A / 0.95 = 19.14 A.
Referring to I
N
in the ratings tables (starting from page 134 ), drive type ACS580-01-025A-4
exceeds the I
N
requirement of 19.24 A.
I
Hd
Maximum current with 150% overload, allowed for one minute every ten minutes
1)
Maximum current with 130% overload, allowed for one minute every ten
minutes
2)
Maximum current with 125% overload, allowed for one minute every ten
minutes
P
Hd
Typical motor power in heavy-duty use (150% overload)