Lenze EDS4900U-REG - Manual (Page 191)

Configuration
7-100 48XX/49XXSHB0399
7.7.2 Overload monitoring for the controller (I
¼t monitoring)
The I
¼t monitoring is designed for 150 % rated current.
4900Str083
P a r a m e t e r P a r a m e t e r
T R I P
O v e r l o a d t i m e R e c o v e r y t i m e
.
.
.
.
.
.
.
.
.
.
.
r r
FIG 7-56 Overload diagram for 48XX/49XX controllers
The parameter I
1
/ I
rated
depends on the controller size. The ratio between
maximum current and rated armature current is indicated in chapter 3.3.
4900Str084
I
t
1
I
r a t e d
I 2
t 1 t 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 required Result from diagram
Overload, I
1
= 1.3 ôI
rated
Overload time, t
1
= 70s
- I
2
= ? (basic load)
- t
2
= ? (recovery time)
I
2
= 0.6 ôI
rated
t
2
> 220 s
2. Basic load, I
2
= 0.8 ôI
rated
,
Recovery time t
2
400s
- I
1
= ? (overload)
- t
1
= ? (overload time)
I
1
= 1.2 ôI
rated
t
1
$75s
For safety reasons, the ”I
¼t monitoring” is rated for continuous load with rated
armature current during mains switch-on.
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