ABB ACS380 Series, Hardware Manual

Page: 90 / 186

90 Technical data
The ratings are valid at a surrounding air temperature of 50 °C (104 °F) for I
N
. When
the temperature increases, derating is required.
The DriveSize dimensioning tool available from ABB 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 in certain
situations. In such situations, where full motor power is required, oversize the drive so
that the derated value provides sufficient capacity.
If several situations are present at a time, the effects of derating are cumulative.
Example:
If your application requires continuous 6.0 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 91 ):
From the table, the minimum size required is I
N
= 9.4 A.
Altitude derating (page 92 ):
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
= 9.4 A / 0.95 = 9.9 A.
Referring to I
N
in the ratings tables (starting from page 88 ), drive type ACS380-04xx-
12A6-4 exceeds the I
N
requirement of 9.9 A.

Surrounding air temperature derating, IP20
Frame size Temperature Derating
R0…R4 up to +50 °C
up to +122 °F
No derating.
R1…R3 +50
…
+60 °C
+122
…
+140 °F
Output current is decreased by 1% for every additional
1 °C (1.8 °F).
R4 +50…+60 °C
+122…+140 °F
Output current is decreased by 1% for every additional
1 °C on:
• ACS380-04xx-032A4-4
• ACS380-04xx-045A-4
Output current is decreased by 2% for every additional
1 °C on:
• ACS380-04xx-038A-4
• ACS380-04xx-050A-4