Maximum current with 150% overload, allowed for one minute
every ten minutes
I
Hd
Typical motor power in heavy-duty use (150% overload)
P
Hd
￭
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: The nominal values of I
N
apply to the ambient temperature of 40 °C (104 °F).
Derating is needed above this temperature for R3...R8 frames.
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 143): 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 142): 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 139), drive type ACS560-01-025A-4
exceeds the
I
N
requirement of 19.24 A.
￭
Ambient temperature derating, IP20
ActionTemperature
range
Frame
Derating not required0...+50 °C
R0…R2
+32... +122 °F
Derating required+50...+55 °C
+122...131 °F
Technical data 141
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