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Configuration
7.7.2
P a r a m e t e r
7-100
48XX/49XXSHB0399
Overload monitoring for the controller (I¼t monitoring)
The I¼t monitoring is designed for 150 % rated current.
r
T R I P
.
.
.
.
.
O v e r l o a d t i m e
FIG 7-56
Overload diagram for 48XX/49XX controllers
The parameter I
/ I
1
rated
maximum current and rated armature current is indicated in chapter 3.3.
I
1
I
r a t e d
I 2
FIG 7-57
Possible current flow when using the full overload capacity of 48XX/49XX controllers
Examples for overload diagrams in FIG 7-56:
given
Overload, I
= 1.3ôI
1
rated
Overload time, t
= 70s
1
2. Basic load, I
= 0.8ôI
,
2
rated
400s
Recovery time t
2
For safety reasons, the "I¼t monitoring" is rated for continuous load with rated
armature current during mains switch-on.
R e c o v e r y t i m e
depends on the controller size. The ratio between
t 1
t 2
t
required
- I
= ? (basic load)
2
- t
= ? (recovery time)
2
- I
= ? (overload)
1
- t
= ? (overload time)
1
P a r a m e t e r
r
.
.
.
.
.
.
4900Str083
4900Str084
Result from diagram
I
= 0.6ôI
2
rated
t
> 220 s
2
I
= 1.2ôI
1
rated
$75s
t
1
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