Lenze 8400 protec Manual - Manual (Page 57)

Technical data
Overcurrent operation
4
l
57 EDS84DPS424 EN 5.0
The curves of typical load functions and the simulation of the "Ixt" function are shown in
the following illustration:
t 0
100
2
0
1
I [%]
aN8
3
Dt
1

‚
Dt
2
Dt
3
Dt
4
8400IZ180
Fig. 4−2 Overcurrent capacity at 45° C
 Pulse load (15 s cycle) Calculation equation:
0 Peak current
A @ Dt
1
)B @ Dt
2
Dt
1
)Dt
2
x 100%
1 Unloading current
Dt
1
Peak current period
Dt
2
Unloading current period
‚ Permanent load (180 s cycle) Calculation equation:
2 Peak current
C @ Dt
3
)D @ Dt
4
Dt
3
)Dt
4
x 100%
3 Unloading current
Dt
3
Peak current period
Dt
4
Unloading current period
I
arx
Rated value of continuous output
current