Note:
The nominal values of I
N
apply to the ambient temperature of 40°C (104°F). Derating is
needed above this temperature.
Derating
The load capacity (
I
N
,
I
Ld
; 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 114)
: 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).
: 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
), drive type
ACQ80-04-011kW-4 exceeds the
I
N
requirement of 19.24 A.
■
Ambient temperature derating, IP20
Action
Temperature range
Frame size
Need no derating
+50°C below
R0
+122°F below
Derate 1% for every (1.8°F), derating 1%
+50°C...55°C
122°F...131°F
Need no derating
+50°C below
R1...R3
+122°F below
Derate 1% for every (1.8°F), derating 1%
+50°C...60°C
122°F...140°F
Need no derating
+40°C Below
R4…R8
+104°F Below
Derate 1% for every (1.8°F), derating 1%
+40…+50°C
+104…+122°F
The output current is calculated by the current given in the rating tables multiplying by the
derating factor (k, as shown in the following figure)
Technical data 113
Summary of Contents for ACQ80-04 Series
Page 1: ...ABB DRIVES FOR WATER ACQ80 04 drives 0 75 to 160 kW 1 0 to 215 hp Hardware manual...
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Page 140: ...Frame R3 IP20 140 Dimension drawings...
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