WEG SSW-07 Manual Del Usuario página 34

Time t(s)
1000
100
10
1
0.1
1x 2x 3x
Figure 4.9 - Motor protection thermal classes in hot condition at 100 % ln
Motor
Current
3xIn
5xIn
7xIn
table 4.3 - Motor protection thermal class time in hot condition
of In of the motor
0 % (cold condition)
100 % (rated load)
table 4.4 - Multiplication factor of the thermal class times in cold condition to
obtain the thermal class times in hot condition
Chapter 4 - SettING the SSW-07
4x 5x 6x 7x 8x
Class
30 20
34.4 s 23.6 s
12.6 s 8.4 s
6.4 s 4.2 s
Current in %
Factor
1
20 % 0.87
40 % 0.74
60 % 0.61
80 % 0.48
0.35
Class 30
Class 25
Class 20
Class 15
Class 10
Class 5
x In motor
Current
9x S.F.=1
10
11.8 s
4.2 s
2.1 s
33