01/02 AWB8230-1415GB
Electronic motor protection
155
Tripping characteristic at normal overload protection
With normal overload protection (PNU b013 = 01), the tripping
current is reduced, for example, by 90 % at 2.5 Hz (
a
Fig. 155).
Accordingly, the tripping characteristic is offset to smaller current
values (
a
Fig. 158).
Tripping characteristic at adjustable overload protection
Here, you can freely select the tripping characteristic
(PNU b013 = 02) by entering the appropriate currency and
frequency coordinates under PNU b015 to b020 (
a
Fig. 156).
These must be within the limits shown (
a
Fig. 159).
The tripping curve then has the following characteristic, repre-
sented by the frequency set under PNU b018 (
a
Fig. 160).
Figure 158: Tripping characteristic for constant overload protection at
2.5 Hz and
I
e
= 23 A
Figure 159: Setting range for the adjustable overload protection
a
Setting range
60
0
23.9 A
104 %
31.1 A
135 %
41.4 A
180 %
0.5
t
[s]
I
80
100
5
0
400
I
[%]
f
[Hz]
a
Figure 160: Tripping characteristic for adjustable overload protection
using PNU b018
60
0
B018:
116 %
120 %
150 %
0.5
[s]
t
I
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