4.4 Thermal Overload Protection (ANSI 49)
413
7UM62 Manual
C53000-G1176-C149-3
Figure 4-4
Trip Time Characteristic Curves for the Thermal Overload Protection (49)
illi Anwender
1
0.3
0.1
1
2
3
5
10 12
100
20
10
5
2
0.5
0.2
0.05
t [min]
t [min]
I
/k
·
I
N
1000
1
0.3
0.1
100
20
10
5
2
0.5
0.2
0.05
[min]
3
30
30
3
Parameter:
Setting Value
of Time
Constant
20
200
500
100
50
10
5
2
1
4
6 7 8
50
t
τ
I
k
I
N
⋅
--------------
è
ø
æ
ö
2
I
k
I
N
⋅
--------------
è
ø
æ
ö
2
1
–
--------------------------------
ln
⋅
=
without pre-load and with I
Max therm.
= 8
⋅
k
⋅
I
N
:
I
/k
·
I
N
1
2
3
5
10 12
4
6 7 8
with 90 % pre-load and with I
Max therm.
= 8
⋅
k
⋅
I
N
:
t
τ
I
k
I
N
⋅
--------------
è
ø
æ
ö
2
I
pre
k
I
N
⋅
--------------
è
ø
ç
÷
æ
ö
2
–
I
k
I
N
⋅
--------------
è
ø
æ
ö
2
1
–
---------------------------------------------------
ln
⋅
=
50
Parameter:
Setting Value
of Time
Constant
1000
500
200
100
50
20
10
5
2
1
τ
[min]
τ
[min]
[min]
