2 device protection by current derating, Device protection by current derating, Technical data – Lenze ECSCAxxx User Manual
Page 47
Technical data
Current characteristics
Device protection by current derating
l
47
EDBCSXA064 EN 3.2
3.3.2
Device protection by current derating
The maximum output current is limited. With output frequencies < 5 Hz the limitation
depends on the heatsink temperature.
0.75
1.00
0.57
0.38
0.67
0.00
1.00
0
5
10
fout [Hz]
Iout
Imax
≤ 70 °C
90 °C
ECSXA024
Fig. 3−2
Current derating characteristics
Operation with switching frequency = 8 kHz (C0018 = 1).
l
If the current exceeds the characteristic
, the switching frequency is automatically
changed to 4 kHz (e.g. for higher torque in acceleration processes).
Operation with switching frequency = 4 kHz (C0018 = 0).
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The current limitation follows the characteristic
.
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With output frequencies < 5 Hz and heatsink temperatures between 70 and 90 °C the
current limit is steplessly adjusted in the range
.
Type
I
max
[A]
Switching frequency 8 kHz
Switching frequency 4 kHz
f
out
> 5 Hz
f
out
W 0 Hz
f
out
> 5 Hz
f
out
W 0 Hz
£ 70 °C
f
out
W 0 Hz
90 °C
ECSxA004
2.7
1.5
4.0
3.0
2.3
ECSxA008
5.3
3.0
8.0
6.0
4.6
ECSxA016
10.7
6.0
16.0
12.0
9.1
ECSxA032
21.3
12.1
32.0
24.0
18.1
ECSxA048
32.0
18.1
48.0
36.3
27.2
ECSxA064
42.7
24.2
64.0
48.0
36.3